put_ctx lockup

Severity

Process gets wedged, requiring reboot.

Found by

perf_fuzzer

First Seen

3.17-rc7

Most recently Seen

3.17

Reproducible

yes

Found On

core2

Linux-kernel Mailing List Report

2 October 2014: as part of the "perf: perf_fuzzer triggers instant reboot" thread.
6 October 2014: perf: 3.17 another perf_fuzzer lockup

Analysis

Kernel Splat

  1. *** perf_fuzzer 0.29-pre *** by Vince Weaver
    
            Linux version 3.18.0+ x86_64
            Processor: Intel 6/23/10
    
            Seeding random number generator with 1418062656
            /proc/sys/kernel/perf_event_max_sample_rate currently: 25000/s
            /proc/sys/kernel/perf_event_paranoid currently: 1
            Logging perf_event_open() failures: no
            Running fsync after every syscall: no
            To reproduce, try: ./perf_fuzzer -s 30000 -r 1418062656
    
    Pid=16860, sleeping 1s
    ==================================================
    Fuzzing the following syscalls:                   
            mmap perf_event_open close read write ioctl fork prctl poll 
    *NOT* Fuzzing the following syscalls:             
                                                      
    Also attempting the following:                    
            signal-handler-on-overflow busy-instruction-loop accessing-perf-proc-and
    -sys-files trashing-the-mmap-page                 
    *NOT* attempting the following:                   
                                                      
    ==================================================
    
    
    ^C
    
    ^C
    
    [ 2220.138908] SysRq : HELP : loglevel(0-9) reboot(b) crash(c) terminate-all-tas
    ks(e) memory-full-oom-kill(f) kill-all-tasks(i) thaw-filesystems(j) sak(k) show-
    backtrace-all-active-cpus(l) show-memory-usage(m) nice-all-RT-tasks(n) poweroff(
    o) show-registers(p) show-all-timers(q) unraw(r) sync(s) show-task-states(t) unm
    ount(u) show-blocked-tasks(w) dump-ftrace-buffer(z) 
    [ 2225.915007] SysRq : Show backtrace of all active CPUs
    [ 2225.916004] sending NMI to all CPUs:
    [ 2225.923649] NMI backtrace for cpu 1
    [ 2225.924000] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.18.0+ #166
    [ 2225.924000] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIO
    S 080015  10/19/2012
    [ 2225.924000] task: ffff88011b375800 ti: ffff88011b394000 task.ti: ffff88011b39
    4000
    [ 2225.924000] RIP: 0010:[]  [] default_idle
    +0x1d/0x2f
    [ 2225.924000] RSP: 0018:ffff88011b397e88  EFLAGS: 00000246
    [ 2225.924000] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000011ac0
    [ 2225.924000] RDX: ffff88011b394010 RSI: 0000000000000001 RDI: 0000000000000001
    [ 2225.924000] RBP: ffff88011b397e88 R08: 0000000000000000 R09: ffff88011b397e68
    [ 2225.924000] R10: 00000001000758c5 R11: ffff88011b397e88 R12: ffff88011b394010
    [ 2225.924000] R13: 0000000000000000 R14: ffff88011b394000 R15: ffff88011b394012
    [ 2225.924000] FS:  0000000000000000(0000) GS:ffff88011fc80000(0000) knlGS:00000
    00000000000
    [ 2225.924000] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    [ 2225.924000] CR2: 0000000001b21008 CR3: 00000000c6e42000 CR4: 00000000000407e0
    [ 2225.924000] DR0: 0000000001fff000 DR1: 0000000000000000 DR2: 000000000075d000
    [ 2225.924000] DR3: 000000003febfdbe DR6: 00000000ffff0ff0 DR7: 0000000000000600
    [ 2225.924000] Stack:
    [ 2225.924000]  ffff88011b397e98 ffffffff8100b29b ffff88011b397f28 ffffffff8106e
    a64
    [ 2225.924000]  0000000000000000 0000000000000000 ffff88011b394010 ffff88011b397
    fd8
    [ 2225.924000]  ffff88011b394010 0000000000000282 ffff88011b394000 ffff88011b394
    000
    [ 2225.924000] Call Trace:
    [ 2225.924000]  [] arch_cpu_idle+0xf/0x11
    [ 2225.924000]  [] cpu_startup_entry+0x143/0x276
    [ 2225.924000]  [] start_secondary+0x114/0x119
    [ 2225.924000] Code: e8 50 96 07 00 41 59 5b 41 5c 41 5d c9 c3 55 48 89 e5 66 66
     66 66 90 bf 01 00 00 00 65 8b 34 25 e0 a0 00 00 e8 93 ff ff ff fb f4 <83> cf ff
     65 8b 34 25 e0 a0 00 00 e8 81 ff ff ff c9 c3 55 48 89 
    [ 2225.916004] NMI backtrace for cpu 0
    [ 2226.097357] INFO: NMI handler (arch_trigger_all_cpu_backtrace_handler) took t
    oo long to run: 173.610 msecs
    [ 2225.916004] CPU: 0 PID: 16860 Comm: perf_fuzzer Not tainted 3.18.0+ #166
    [ 2225.916004] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIO
    S 080015  10/19/2012
    [ 2225.916004] task: ffff8800cb344000 ti: ffff8800c74ec000 task.ti: ffff8800c74e
    c000
    [ 2225.916004] RIP: 0010:[]  [] delay_tsc+0x
    23/0x52
    [ 2225.916004] RSP: 0018:ffff88011fc03d28  EFLAGS: 00000046
    [ 2225.916004] RAX: 000000009ff8f88c RBX: 0000000000000001 RCX: 000000009ff8f7f4
    [ 2225.916004] RDX: 000000000000052b RSI: 0000000000000000 RDI: 00000000002658f4
    [ 2225.916004] RBP: ffff88011fc03d28 R08: 0000000000000000 R09: 0000000000000295
    [ 2225.916004] R10: 0000000000000000 R11: ffff88011fc03c48 R12: 000000000000006c
    [ 2225.916004] R13: 0000000000000007 R14: 0000000000000001 R15: 0000000000000046
    [ 2225.916004] FS:  00007f3839683700(0000) GS:ffff88011fc00000(0000) knlGS:00000
    00000000000
    [ 2225.916004] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    [ 2225.916004] CR2: 0000000001b21008 CR3: 00000000c6e42000 CR4: 00000000000407f0
    [ 2225.916004] DR0: 0000000000000000 DR1: 0000000001fff000 DR2: 0000000000760000
    [ 2225.916004] DR3: 000000000075a000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
    [ 2225.916004] Stack:
    [ 2225.916004]  ffff88011fc03d38 ffffffff812bcec1 ffff88011fc03d58 ffffffff8102e
    114
    [ 2225.916004]  0000000000000008 ffffffff81a6fa30 ffff88011fc03d68 ffffffff81345
    48f
    [ 2225.916004]  ffff88011fc03d98 ffffffff8134579d ffffffff81c809b0 0000000000000
    100
    [ 2225.916004] Call Trace:
    [ 2225.916004]   
    [ 2225.916004]  [] __const_udelay+0x25/0x27
    [ 2225.916004]  [] arch_trigger_all_cpu_backtrace+0xc7/0xe0
    [ 2225.916004]  [] sysrq_handle_showallcpus+0x13/0x15
    [ 2225.916004]  [] __handle_sysrq+0xaf/0x13e
    [ 2225.916004]  [] handle_sysrq+0x2c/0x2e
    [ 2225.916004]  [] serial8250_rx_chars+0x145/0x1c2
    [ 2225.916004]  [] serial8250_handle_irq+0x76/0xb6
    [ 2225.916004]  [] serial8250_default_handle_irq+0x2b/0x40
    [ 2225.916004]  [] ? intr_complete+0x43/0x6c [usbnet]
    [ 2225.916004]  [] serial8250_interrupt+0x42/0xb6
    [ 2225.916004]  [] handle_irq_event_percpu+0x60/0x169
    [ 2225.916004]  [] handle_irq_event+0x3f/0x5b
    [ 2225.916004]  [] ? ack_apic_edge+0x36/0x3a
    [ 2225.916004]  [] handle_edge_irq+0xb2/0xce
    [ 2225.916004]  [] handle_irq+0x27/0x2f
    [ 2225.916004]  [] do_IRQ+0x53/0xd9
    [ 2225.916004]  [] common_interrupt+0x6a/0x6a
    [ 2225.916004]   
    [ 2225.916004]  [] ? get_page_from_freelist+0x55/0x781
    [ 2225.916004]  [] __alloc_pages_nodemask+0x167/0x6dc
    [ 2225.916004]  [] ? intel_pmu_enable_all+0x28/0xa4
    [ 2225.916004]  [] kmem_getpages+0x58/0xec
    [ 2225.916004]  [] cache_grow+0xad/0x1d8
    [ 2225.916004]  [] ____cache_alloc+0x237/0x2ce
    [ 2225.916004]  [] __kmalloc+0x8f/0xf2
    [ 2225.916004]  [] ? T.1336+0xe/0x10
    [ 2225.916004]  [] T.1336+0xe/0x10
    [ 2225.916004]  [] alloc_perf_context+0x20/0x51
    [ 2225.916004]  [] find_get_context+0x138/0x1c7
    [ 2225.916004]  [] SYSC_perf_event_open+0x48b/0x870
    [ 2225.916004]  [] SyS_perf_event_open+0xe/0x10
    [ 2225.916004]  [] system_call_fastpath+0x16/0x1b
    [ 2225.916004] Code: bf e8 b0 ff ff ff c9 c3 55 48 89 e5 66 66 66 66 90 65 8b 34
     25 e0 a0 00 00 66 66 90 0f ae e8 0f 31 89 c1 66 66 90 0f ae e8 0f 31 <89> c2 29
     ca 39 fa 73 23 f3 90 65 44 8b 04 25 e0 a0 00 00 44 39 
    [ 2225.916004] INFO: NMI handler (arch_trigger_all_cpu_backtrace_handler) took t
    oo long to run: 523.849 msecs
    [ 2256.707560] SysRq : Show backtrace of all active CPUs
    [ 2256.708004] sending NMI to all CPUs:
    [ 2256.708004] NMI backtrace for cpu 0
    [ 2256.708004] CPU: 0 PID: 16860 Comm: perf_fuzzer Not tainted 3.18.0+ #166
    [ 2256.708004] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIO
    S 080015  10/19/2012
    [ 2256.708004] task: ffff8800cb344000 ti: ffff8800c74ec000 task.ti: ffff8800c74e
    c000
    [ 2256.708004] RIP: 0010:[]  [] delay_tsc+0x
    23/0x52
    [ 2256.708004] RSP: 0018:ffff88011fc03d28  EFLAGS: 00000046
    [ 2256.708004] RAX: 00000000c993f3a5 RBX: 0000000000000001 RCX: 00000000c993f30d
    [ 2256.708004] RDX: 000000000000053d RSI: 0000000000000000 RDI: 00000000002658f4
    [ 2256.708004] RBP: ffff88011fc03d28 R08: 0000000000000000 R09: 00000000000002eb
    [ 2256.708004] R10: 0000000000000000 R11: ffff88011fc03c48 R12: 000000000000006c
    [ 2256.708004] R13: 0000000000000007 R14: 0000000000000001 R15: 0000000000000046
    [ 2256.708004] FS:  00007f3839683700(0000) GS:ffff88011fc00000(0000) knlGS:00000
    00000000000
    [ 2256.708004] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    [ 2256.708004] CR2: 0000000001b21008 CR3: 00000000c6e42000 CR4: 00000000000407f0
    [ 2256.708004] DR0: 0000000000000000 DR1: 0000000001fff000 DR2: 0000000000760000
    [ 2256.708004] DR3: 000000000075a000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
    [ 2256.708004] Stack:
    [ 2256.708004]  ffff88011fc03d38 ffffffff812bcec1 ffff88011fc03d58 ffffffff8102e
    114
    [ 2256.708004]  0000000000000008 ffffffff81a6fa30 ffff88011fc03d68 ffffffff81345
    48f
    [ 2256.708004]  ffff88011fc03d98 ffffffff8134579d ffffffff81c809b0 0000000000000
    100
    [ 2256.708004] Call Trace:
    [ 2256.708004]   
    [ 2256.708004]  [] __const_udelay+0x25/0x27
    [ 2256.708004]  [] arch_trigger_all_cpu_backtrace+0xc7/0xe0
    [ 2256.708004]  [] sysrq_handle_showallcpus+0x13/0x15
    [ 2256.708004]  [] __handle_sysrq+0xaf/0x13e
    [ 2256.708004]  [] handle_sysrq+0x2c/0x2e
    [ 2256.708004]  [] serial8250_rx_chars+0x145/0x1c2
    [ 2256.708004]  [] serial8250_handle_irq+0x76/0xb6
    [ 2256.708004]  [] serial8250_default_handle_irq+0x2b/0x40
    [ 2256.708004]  [] ? intr_complete+0x43/0x6c [usbnet]
    [ 2256.708004]  [] serial8250_interrupt+0x42/0xb6
    [ 2256.708004]  [] handle_irq_event_percpu+0x60/0x169
    [ 2256.708004]  [] handle_irq_event+0x3f/0x5b
    [ 2256.708004]  [] ? ack_apic_edge+0x36/0x3a
    [ 2256.708004]  [] handle_edge_irq+0xb2/0xce
    [ 2256.708004]  [] handle_irq+0x27/0x2f
    [ 2256.708004]  [] do_IRQ+0x53/0xd9
    [ 2256.708004]  [] common_interrupt+0x6a/0x6a
    [ 2256.708004]   
    [ 2256.708004]  [] ? put_ctx+0x40/0x61
    [ 2256.708004]  [] find_get_context+0x1a9/0x1c7
    [ 2256.708004]  [] SYSC_perf_event_open+0x48b/0x870
    [ 2256.708004]  [] SyS_perf_event_open+0xe/0x10
    [ 2256.708004]  [] system_call_fastpath+0x16/0x1b
    [ 2256.708004] Code: bf e8 b0 ff ff ff c9 c3 55 48 89 e5 66 66 66 66 90 65 8b 34
     25 e0 a0 00 00 66 66 90 0f ae e8 0f 31 89 c1 66 66 90 0f ae e8 0f 31 <89> c2 29
     ca 39 fa 73 23 f3 90 65 44 8b 04 25 e0 a0 00 00 44 39 
    [ 2256.720000] NMI backtrace for cpu 1
    [ 2256.720000] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.18.0+ #166
    [ 2256.720000] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIO
    S 080015  10/19/2012
    [ 2256.720000] task: ffff88011b375800 ti: ffff88011b394000 task.ti: ffff88011b39
    4000
    [ 2256.720000] RIP: 0010:[]  [] default_idle
    +0x1d/0x2f
    [ 2256.720000] RSP: 0018:ffff88011b397e88  EFLAGS: 00000246
    [ 2256.720000] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000011ac0
    [ 2256.720000] RDX: ffff88011b394010 RSI: 0000000000000001 RDI: 0000000000000001
    [ 2256.720000] RBP: ffff88011b397e88 R08: 0000000000000000 R09: ffff88011b397e68
    [ 2256.720000] R10: 00000001000776d7 R11: ffff88011b397e88 R12: ffff88011b394010
    [ 2256.720000] R13: 0000000000000000 R14: ffff88011b394000 R15: ffff88011b394012
    [ 2256.720000] FS:  0000000000000000(0000) GS:ffff88011fc80000(0000) knlGS:00000
    00000000000
    [ 2256.720000] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    [ 2256.720000] CR2: 0000000001b21008 CR3: 00000000c95e0000 CR4: 00000000000407e0
    [ 2256.720000] DR0: 0000000001fff000 DR1: 0000000000000000 DR2: 000000000075d000
    [ 2256.720000] DR3: 000000003febfdbe DR6: 00000000ffff0ff0 DR7: 0000000000000600
    [ 2256.720000] Stack:                             
    [ 2256.720000]  ffff88011b397e98 ffffffff8100b29b ffff88011b397f28 ffffffff8106e
    a64                                               
    [ 2256.720000]  0000000000000000 0000000000000000 ffff88011b394010 ffff88011b397
    fd8
    [ 2256.720000]  ffff88011b394010 0000000000000282 ffff88011b394000 ffff88011b394
    000
    [ 2256.720000] Call Trace:
    [ 2256.720000]  [] arch_cpu_idle+0xf/0x11
    [ 2256.720000]  [] cpu_startup_entry+0x143/0x276
    [ 2256.720000]  [] start_secondary+0x114/0x119
    [ 2256.720000] Code: e8 50 96 07 00 41 59 5b 41 5c 41 5d c9 c3 55 48 89 e5 66 66
     66 66 90 bf 01 00 00 00 65 8b 34 25 e0 a0 00 00 e8 93 ff ff ff fb f4 <83> cf ff
     65 8b 34 25 e0 a0 00 00 e8 81 ff ff ff c9 c3 55 48 89 
    
    [ 2303.792242] SysRq : Show backtrace of all active CPUs
    [ 2303.796003] sending NMI to all CPUs:
    [ 2303.796003] NMI backtrace for cpu 0
    [ 2303.796003] CPU: 0 PID: 16860 Comm: perf_fuzzer Not tainted 3.18.0+ #166
    [ 2303.796003] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIO
    S 080015  10/19/2012
    [ 2303.796003] task: ffff8800cb344000 ti: ffff8800c74ec000 task.ti: ffff8800c74e
    c000
    [ 2303.796003] RIP: 0010:[]  [] delay_tsc+0x
    39/0x52
    [ 2303.796003] RSP: 0018:ffff88011fc03d28  EFLAGS: 00000046
    [ 2303.796003] RAX: 000000008f40fc94 RBX: 0000000000000001 RCX: 000000008f40fc6e
    [ 2303.796003] RDX: 0000000000000026 RSI: 0000000000000000 RDI: 00000000002658f4
    [ 2303.796003] RBP: ffff88011fc03d28 R08: 0000000000000000 R09: 0000000000000336
    [ 2303.796003] R10: 0000000000000000 R11: ffff88011fc03c48 R12: 000000000000006c
    [ 2303.796003] R13: 0000000000000007 R14: 0000000000000001 R15: 0000000000000046
    [ 2303.796003] FS:  00007f3839683700(0000) GS:ffff88011fc00000(0000) knlGS:00000
    00000000000
    [ 2303.796003] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    [ 2303.796003] CR2: 0000000001b21008 CR3: 00000000c6e42000 CR4: 00000000000407f0
    [ 2303.796003] DR0: 0000000000000000 DR1: 0000000001fff000 DR2: 0000000000760000
    [ 2303.796003] DR3: 000000000075a000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
    [ 2303.796003] Stack:
    [ 2303.796003]  ffff88011fc03d38 ffffffff812bcec1 ffff88011fc03d58 ffffffff8102e
    114
    [ 2303.796003]  0000000000000008 ffffffff81a6fa30 ffff88011fc03d68 ffffffff81345
    48f
    [ 2303.796003]  ffff88011fc03d98 ffffffff8134579d ffffffff81c809b0 0000000000000
    100
    [ 2303.796003] Call Trace:
    [ 2303.796003]   
    [ 2303.796003]  [] __const_udelay+0x25/0x27
    [ 2303.796003]  [] arch_trigger_all_cpu_backtrace+0xc7/0xe0
    [ 2303.796003]  [] sysrq_handle_showallcpus+0x13/0x15
    [ 2303.796003]  [] __handle_sysrq+0xaf/0x13e
    [ 2303.796003]  [] handle_sysrq+0x2c/0x2e
    [ 2303.796003]  [] serial8250_rx_chars+0x145/0x1c2
    [ 2303.796003]  [] serial8250_handle_irq+0x76/0xb6
    [ 2303.796003]  [] serial8250_default_handle_irq+0x2b/0x40
    [ 2303.796003]  [] ? delayed_work_timer_fn+0x18/0x1a
    [ 2303.796003]  [] serial8250_interrupt+0x42/0xb6
    [ 2303.796003]  [] ? __queue_work+0x289/0x289
    [ 2303.796003]  [] handle_irq_event_percpu+0x60/0x169
    [ 2303.796003]  [] handle_irq_event+0x3f/0x5b
    [ 2303.796003]  [] ? ack_apic_edge+0x36/0x3a
    [ 2303.796003]  [] handle_edge_irq+0xb2/0xce
    [ 2303.796003]  [] handle_irq+0x27/0x2f
    [ 2303.796003]  [] do_IRQ+0x53/0xd9
    [ 2303.796003]  [] common_interrupt+0x6a/0x6a
    [ 2303.796003]   
    [ 2303.796003]  [] ? kmalloc_slab+0x7f/0x8d
    [ 2303.796003]  [] __kmalloc+0x29/0xf2
    [ 2303.796003]  [] ? T.1336+0xe/0x10
    [ 2303.796003]  [] T.1336+0xe/0x10
    [ 2303.796003]  [] alloc_perf_context+0x20/0x51
    [ 2303.796003]  [] find_get_context+0x138/0x1c7
    [ 2303.796003]  [] SYSC_perf_event_open+0x48b/0x870
    [ 2303.796003]  [] SyS_perf_event_open+0xe/0x10
    [ 2303.796003]  [] system_call_fastpath+0x16/0x1b
    [ 2303.796003] Code: a0 00 00 66 66 90 0f ae e8 0f 31 89 c1 66 66 90 0f ae e8 0f
     31 89 c2 29 ca 39 fa 73 23 f3 90 65 44 8b 04 25 e0 a0 00 00 44 39 c6 <74> e0 29
     c1 01 cf 66 66 90 0f ae e8 0f 31 89 c1 44 89 c6 eb cd 
    [ 2303.804000] NMI backtrace for cpu 1
    [ 2303.804000] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.18.0+ #166
    [ 2303.804000] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIO
    S 080015  10/19/2012
    [ 2303.804000] task: ffff88011b375800 ti: ffff88011b394000 task.ti: ffff88011b39
    4000
    [ 2303.804000] RIP: 0010:[]  [] default_idle
    +0x1d/0x2f
    [ 2303.804000] RSP: 0018:ffff88011b397e88  EFLAGS: 00000246
    [ 2303.804000] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000011ac0
    [ 2303.804000] RDX: ffff88011b394010 RSI: 0000000000000001 RDI: 0000000000000001
    [ 2303.804000] RBP: ffff88011b397e88 R08: 0000000000000000 R09: ffff88011b397e68
    [ 2303.804000] R10: 000000010007a4d3 R11: ffff88011b397e88 R12: ffff88011b394010
    [ 2303.804000] R13: 0000000000000000 R14: ffff88011b394000 R15: ffff88011b394012
    [ 2303.804000] FS:  0000000000000000(0000) GS:ffff88011fc80000(0000) knlGS:00000
    00000000000
    [ 2303.804000] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    [ 2303.804000] CR2: 0000000001b21008 CR3: 00000000c6e42000 CR4: 00000000000407e0
    [ 2303.804000] DR0: 0000000001fff000 DR1: 0000000000000000 DR2: 000000000075d000
    [ 2303.804000] DR3: 000000003febfdbe DR6: 00000000ffff0ff0 DR7: 0000000000000600
    [ 2303.804000] Stack:
    [ 2303.804000]  ffff88011b397e98 ffffffff8100b29b ffff88011b397f28 ffffffff8106e
    a64
    [ 2303.804000]  0000000000000000 0000000000000000 ffff88011b394010 ffff88011b397
    fd8
    [ 2303.804000]  ffff88011b394010 0000000000000282 ffff88011b394000 ffff88011b394
    000
    [ 2303.804000] Call Trace:
    [ 2303.804000]  [] arch_cpu_idle+0xf/0x11
    [ 2303.804000]  [] cpu_startup_entry+0x143/0x276
    [ 2303.804000]  [] start_secondary+0x114/0x119
    [ 2303.804000] Code: e8 50 96 07 00 41 59 5b 41 5c 41 5d c9 c3 55 48 89 e5 66 66
     66 66 90 bf 01 00 00 00 65 8b 34 25 e0 a0 00 00 e8 93 ff ff ff fb f4 <83> cf ff
     65 8b 34 25 e0 a0 00 00 e8 81 ff ff ff c9 c3 55 48 89 
    
  2. Stopping after 50000
    Using user-specified random seed of 1412213351
    
    *** perf_fuzzer 0.29-pre *** by Vince Weaver
    
    	Linux version 3.17.0+ x86_64
    	Processor: Intel 6/23/10
    
    	Seeding random number generator with 1412213351
    	/proc/sys/kernel/perf_event_max_sample_rate currently: 25000/s
    	/proc/sys/kernel/perf_event_paranoid currently: 1
    	Logging perf_event_open() failures: no
    	Running fsync after every syscall: no
    	To reproduce, try: ./perf_fuzzer -t OCIRMQWPFpAi -s 50000 -r 1412213351 
    
    Pid=7273, sleeping 1s
    ^Z
    [1]+  Stopped                 ./perf_fuzzer -t OCIRMQWPFpAi -s 50000 -r 1412213351
    vince@core2:~/research/perf_event_tests/perf_event_tests.git/fuzzer$ fg
    ./perf_fuzzer -t OCIRMQWPFpAi -s 50000 -r 1412213351
    ==================================================
    Fuzzing the following syscalls:
    	mmap perf_event_open close read write ioctl fork prctl poll 
    *NOT* Fuzzing the following syscalls:
    	
    Also attempting the following:
    	busy-instruction-loop accessing-perf-proc-and-sys-files trashing-the-mmap-page 
    *NOT* attempting the following:
    	signal-handler-on-overflow 
    ==================================================
    Iteration 10000
    	Open attempts: 205086  Successful: 905
    		EPERM : 36
    		ENOENT : 1799
    		E2BIG : 22400
    		EBADF : 7744
    		EACCES : 346
    		EINVAL : 170618
    		ENOSPC : 181
    		EOPNOTSUPP : 1057
    		Type (Hardware 202/26997)(software 324/32251)(tracepoint 107/32351)(Cache 53/25782)(cpu 187/32291)(breakpoint 32/32086)(#6 0/36)(#7 0/26)(#8 0/87)(#9 0/32)(#10 0/22)(#11 0/24)(#12 0/26)(#13 0/19)(#14 0/29)(>14 0/23027)
    	Close attempts: 892  Successful: 892
    	Read attempts: 912  Successful: 779
    	Write attempts: 876  Successful: 0
    	Ioctl attempts: 917  Successful: 431
    	Mmap attempts: 905  Successful: 306
    	Prctl attempts: 902  Successful: 902
    	Fork attempts: 444  Successful: 444
    	Poll attempts: 927  Successful: 1
    	Access attempts: 972  Successful: 487
    	Trash mmap attempts: 853  Successful: 853
    	Overflows: 0
    	SIGIOs due to RT signal queue full: 0
    Iteration 20000
    	Open attempts: 224787  Successful: 933
    		EPERM : 24
    		ENOENT : 1915
    		E2BIG : 24151
    		EBADF : 8724
    		EACCES : 381
    		EINVAL : 187328
    		ENOSPC : 215
    		EOPNOTSUPP : 1116
    		Type (Hardware 212/29986)(software 360/35417)(tracepoint 103/35380)(Cache 55/28207)(cpu 179/35181)(breakpoint 24/35199)(#6 0/36)(#7 0/14)(#8 0/103)(#9 0/22)(#10 0/34)(#11 0/27)(#12 0/35)(#13 0/30)(#14 0/35)(>14 0/25081)
    	Close attempts: 909  Successful: 909
    	Read attempts: 874  Successful: 762
    	Write attempts: 871  Successful: 0
    	Ioctl attempts: 907  Successful: 435
    	Mmap attempts: 933  Successful: 282
    	Prctl attempts: 969  Successful: 969
    	Fork attempts: 445  Successful: 445
    	Poll attempts: 909  Successful: 1
    	Access attempts: 899  Successful: 425
    	Trash mmap attempts: 929  Successful: 929
    	Overflows: 0
    	SIGIOs due to RT signal queue full: 0
    Iteration 30000
    	Open attempts: 206835  Successful: 877
    		EPERM : 28
    		ENOENT : 1789
    		E2BIG : 22562
    		EBADF : 7880
    		EACCES : 358
    		EINVAL : 172098
    		ENOSPC : 203
    		EOPNOTSUPP : 1040
    		Type (Hardware 175/27601)(software 359/32654)(tracepoint 106/32377)(Cache 37/25798)(cpu 182/32173)(breakpoint 18/32448)(#6 0/35)(#7 0/29)(#8 0/99)(#9 0/26)(#10 0/32)(#11 0/27)(#12 0/32)(#13 0/22)(#14 0/28)(>14 0/23454)
    	Close attempts: 903  Successful: 903
    	Read attempts: 917  Successful: 809
    	Write attempts: 911  Successful: 0
    	Ioctl attempts: 901  Successful: 407
    	Mmap attempts: 877  Successful: 318
    	Prctl attempts: 865  Successful: 865
    	Fork attempts: 467  Successful: 467
    	Poll attempts: 944  Successful: 0
    	Access attempts: 898  Successful: 430
    	Trash mmap attempts: 885  Successful: 885
    	Overflows: 0
    	SIGIOs due to RT signal queue full: 0
    [  843.700042] general protection fault: 0000 [#1] SMP 
    [  843.704001] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative f71882fg mcs7830 evdev usbnet coretemp ohci_pci pcspkr ohci_hcd psmouse serio_raw video wmi i2c_nforce2 button acpi_cpufreq processor thermal_sys sg ehci_pci ehci_hcd sd_mod usbcore usb_common
    [  843.704001] CPU: 1 PID: 7273 Comm: perf_fuzzer Not tainted 3.17.0+ #86
    [  843.704001] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015  10/19/2012
    [  843.704001] task: ffff88011a874000 ti: ffff8800bc0ec000 task.ti: ffff8800bc0ec000
    [  843.704001] RIP: 0010:[]  [] perf_event_context_sched_in.isra.75+0x1f/0x90
    [  843.704001] RSP: 0018:ffff8800bc0efd50  EFLAGS: 00010087
    [  843.704001] RAX: ffffea0002ba2d68 RBX: ffff1001e742c000 RCX: 000000000000038f
    [  843.704001] RDX: ffff88011fc95b30 RSI: ffff880037d0eb00 RDI: ffff880037d0e700
    [  843.704001] RBP: ffff8800bc0efd60 R08: ffff8800bc0ec000 R09: 000000000000baff
    [  843.704001] R10: 0000000000000006 R11: 00000000000009bc R12: ffff880037d0e700
    [  843.704001] R13: ffff8800c944f400 R14: 0000000000000001 R15: ffff88011b340800
    [  843.704001] FS:  00007ffc76c17700(0000) GS:ffff88011fc80000(0000) knlGS:0000000000000000
    [  843.704001] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    [  843.704001] CR2: 00007fffcd163028 CR3: 00000000c167f000 CR4: 00000000000407e0
    [  843.704001] DR0: 0000000001c7b000 DR1: 0000000000000000 DR2: 0000000001c7b000
    [  843.704001] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
    [  843.704001] Stack:
    [  843.704001]  ffff88011a874000 ffff88011b340800 ffff8800bc0efd90 ffffffff810cd9bb
    [  843.704001]  ffff88011a8744e8 ffff88011b340800 ffff88011fc929c0 ffff8800c944f400
    [  843.704001]  ffff8800bc0efdc0 ffffffff8105ae62 ffff88011fc929c0 ffff8800c944f400
    [  843.704001] Call Trace:
    [  843.704001]  [] __perf_event_task_sched_in+0x37/0xf4
    [  843.704001]  [] finish_task_switch+0x9b/0xa6
    [  843.704001]  [] __schedule+0x309/0x4a5
    [  843.704001]  [] _cond_resched+0x28/0x3b
    [  843.704001]  [] mutex_lock+0x12/0x2f
    [  843.704001]  [] find_get_context+0xfc/0x170
    [  843.704001]  [] SYSC_perf_event_open+0x47b/0x7f5
    [  843.704001]  [] SyS_perf_event_open+0xe/0x10
    [  843.704001]  [] tracesys+0xd4/0xd9
    [  843.704001] Code: 89 e7 e8 65 fe ff ff 5b 41 5c 5d c3 e8 c7 7e 45 00 55 48 89 e5 41 54 49 89 fc 53 48 8b 07 48 8b 58 40 65 48 03 1c 25 08 ce 00 00 <48> 39 bb d8 00 00 00 74 63 48 89 fe 48 89 df e8 f0 b4 ff ff 49 
    [  843.704001] RIP  [] perf_event_context_sched_in.isra.75+0x1f/0x90
    [  843.704001]  RSP 
    [  843.704001] ---[ end trace 24a30c0f4ce68693 ]---
    [  843.960002] ------------[ cut here ]------------
    [  843.960002] WARNING: CPU: 0 PID: 2018 at kernel/watchdog.c:267 watchdog_overflow_callback+0x9b/0xa7()
    [  843.960002] Watchdog detected hard LOCKUP on cpu 0
    [  843.960002] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative f71882fg mcs7830 evdev usbnet coretemp ohci_pci pcspkr ohci_hcd psmouse serio_raw video wmi i2c_nforce2 button acpi_cpufreq processor thermal_sys sg ehci_pci ehci_hcd sd_mod usbcore usb_common
    [  843.960002] CPU: 0 PID: 2018 Comm: rsyslogd Tainted: G      D        3.17.0+ #86
    [  843.960002] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015  10/19/2012
    [  843.960002]  0000000000000000 ffff88011fc06c20 ffffffff8151e1be ffff88011fc06c68
    [  843.960002]  ffff88011fc06c58 ffffffff8103ee43 ffffffff810a6bd6 ffff88011b349800
    [  843.960002]  0000000000000000 ffff88011fc06d70 ffff88011fc06ef8 ffff88011fc06cb8
    [  843.960002] Call Trace:
    [  843.960002]    [] dump_stack+0x45/0x56
    [  843.960002]  [] warn_slowpath_common+0x7f/0x98
    [  843.960002]  [] ? watchdog_overflow_callback+0x9b/0xa7
    [  843.960002]  [] warn_slowpath_fmt+0x4c/0x4e
    [  843.960002]  [] ? ftrace_call+0x5/0x2f
    [  843.960002]  [] ? ftrace_call+0x5/0x2f
    [  843.960002]  [] watchdog_overflow_callback+0x9b/0xa7
    [  843.960002]  [] __perf_event_overflow+0x139/0x1bd
    [  843.960002]  [] perf_event_overflow+0x19/0x1b
    [  843.960002]  [] intel_pmu_handle_irq+0x29d/0x323
    [  843.960002]  [] ? ftrace_call+0x5/0x2f
    [  843.960002]  [] perf_event_nmi_handler+0x25/0x3e
    [  843.960002]  [] nmi_handle+0x60/0xf3
    [  843.960002]  [] ? cpumask_clear_cpu.constprop.3+0x11/0x11
    [  843.960002]  [] default_do_nmi+0x50/0xdc
    [  843.960002]  [] do_nmi+0x64/0xa6
    [  843.960002]  [] end_repeat_nmi+0x1e/0x2e
    [  843.960002]  [] ? do_raw_spin_lock+0x1c/0x27
    [  843.960002]  [] ? do_raw_spin_lock+0x1c/0x27
    [  843.960002]  [] ? do_raw_spin_lock+0x1c/0x27
    [  843.960002]  <>    [] _raw_spin_lock+0xe/0x10
    [  843.960002]  [] load_balance+0x2bf/0x63d
    [  843.960002]  [] ? try_to_wake_up+0x1c4/0x1d4
    [  843.960002]  [] rebalance_domains+0x144/0x205
    [  843.960002]  [] run_rebalance_domains+0x3d/0x15c
    [  843.960002]  [] __do_softirq+0xde/0x238
    [  843.960002]  [] irq_exit+0x3f/0x86
    [  843.960002]  [] smp_apic_timer_interrupt+0x35/0x41
    [  843.960002]  [] apic_timer_interrupt+0x6a/0x70
    [  843.960002]   
    [  843.960002] ---[ end trace 24a30c0f4ce68694 ]---
    [  843.957990] ------------[ cut here ]------------
    [  843.957990] WARNING: CPU: 1 PID: 7273 at kernel/watchdog.c:267 watchdog_overflow_callback+0x9b/0xa7()
    [  843.957990] Watchdog detected hard LOCKUP on cpu 1
    [  843.957990] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative f71882fg mcs7830 evdev usbnet coretemp ohci_pci pcspkr ohci_hcd psmouse serio_raw video wmi i2c_nforce2 button acpi_cpufreq processor thermal_sys sg ehci_pci ehci_hcd sd_mod usbcore usb_common
    [  843.957990] CPU: 1 PID: 7273 Comm: perf_fuzzer Tainted: G      D W      3.17.0+ #86
    [  843.957990] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015  10/19/2012
    [  843.957990]  0000000000000000 ffff88011fc86c20 ffffffff8151e1be ffff88011fc86c68
    [  843.957990]  ffff88011fc86c58 ffffffff8103ee43 ffffffff810a6bd6 ffff88011ac2ac00
    [  843.957990]  0000000000000001 ffff88011fc86d70 ffff88011fc86ef8 ffff88011fc86cb8
    [  843.957990] Call Trace:
    [  843.957990]    [] dump_stack+0x45/0x56
    [  843.957990]  [] warn_slowpath_common+0x7f/0x98
    [  843.957990]  [] ? watchdog_overflow_callback+0x9b/0xa7
    [  843.957990]  [] warn_slowpath_fmt+0x4c/0x4e
    [  843.957990]  [] ? ftrace_call+0x5/0x2f
    [  843.957990]  [] watchdog_overflow_callback+0x9b/0xa7
    [  843.957990]  [] __perf_event_overflow+0x139/0x1bd
    [  843.957990]  [] perf_event_overflow+0x19/0x1b
    [  843.957990]  [] intel_pmu_handle_irq+0x29d/0x323
    [  843.957990]  [] ? ftrace_call+0x5/0x2f
    [  843.957990]  [] perf_event_nmi_handler+0x25/0x3e
    [  843.957990]  [] nmi_handle+0x60/0xf3
    [  843.957990]  [] ? cpumask_clear_cpu.constprop.3+0x11/0x11
    [  843.957990]  [] ? tick_sched_do_timer+0x2f/0x2f
    [  843.957990]  [] default_do_nmi+0x50/0xdc
    [  843.957990]  [] do_nmi+0x64/0xa6
    [  843.957990]  [] end_repeat_nmi+0x1e/0x2e
    [  843.957990]  [] ? tick_sched_do_timer+0x2f/0x2f
    [  843.957990]  [] ? do_raw_spin_lock+0x23/0x27
    [  843.957990]  [] ? do_raw_spin_lock+0x23/0x27
    [  843.957990]  [] ? do_raw_spin_lock+0x23/0x27
    [  843.957990]  <>    [] _raw_spin_lock+0xe/0x10
    [  843.957990]  [] scheduler_tick+0x3d/0x85
    [  843.957990]  [] update_process_times+0x56/0x65
    [  843.957990]  [] tick_sched_handle+0x4a/0x59
    [  843.957990]  [] tick_sched_timer+0x3a/0x58
    [  843.957990]  [] __run_hrtimer+0x92/0x14b
    [  843.957990]  [] hrtimer_interrupt+0xe8/0x1d3
    [  843.957990]  [] local_apic_timer_interrupt+0x54/0x57
    [  843.957990]  [] smp_apic_timer_interrupt+0x30/0x41
    [  843.957990]  [] apic_timer_interrupt+0x6a/0x70
    [  843.957990]    [] ? console_unlock+0x30d/0x32b
    [  843.957990]  [] ? acct_collect+0x164/0x16e
    [  843.957990]  [] do_exit+0x21c/0x8fe
    [  843.957990]  [] ? printk+0x54/0x56
    [  843.957990]  [] oops_end+0xa6/0xad
    [  843.957990]  [] die+0x5a/0x63
    [  843.957990]  [] do_general_protection+0x96/0x142
    [  843.957990]  [] general_protection+0x22/0x30
    [  843.957990]  [] ? perf_event_context_sched_in.isra.75+0x1f/0x90
    [  843.957990]  [] __perf_event_task_sched_in+0x37/0xf4
    [  843.957990]  [] finish_task_switch+0x9b/0xa6
    [  843.957990]  [] __schedule+0x309/0x4a5
    [  843.957990]  [] _cond_resched+0x28/0x3b
    [  843.957990]  [] mutex_lock+0x12/0x2f
    [  843.957990]  [] find_get_context+0xfc/0x170
    [  843.957990]  [] SYSC_perf_event_open+0x47b/0x7f5
    [  843.957990]  [] SyS_perf_event_open+0xe/0x10
    [  843.957990]  [] tracesys+0xd4/0xd9
    [  843.957990] ---[ end trace 24a30c0f4ce68695 ]---
    
  3. *** perf_fuzzer 0.29-pre *** by Vince Weaver
    
            Linux version 3.17.0-rc7+ x86_64
            Processor: Intel 6/23/10
    
            Seeding random number generator with 1412213351
            /proc/sys/kernel/perf_event_max_sample_rate currently: 25000/s
            /proc/sys/kernel/perf_event_paranoid currently: 1
            Logging perf_event_open() failures: no
            Running fsync after every syscall: no
            To reproduce, try: ./perf_fuzzer -t OCIRMQWPFpAi -s 50000 -r 1412213351
    
    Pid=10004, sleeping 1s
    ==================================================
    Fuzzing the following syscalls:
            mmap perf_event_open close read write ioctl fork prctl poll 
    *NOT* Fuzzing the following syscalls:
            
    Also attempting the following:
            busy-instruction-loop accessing-perf-proc-and-sys-files trashing-the-mmap-page 
    *NOT* attempting the following:
            signal-handler-on-overflow 
    ==================================================
    Iteration 10000
            Open attempts: 205086  Successful: 905
                    EPERM : 24
                    ENOENT : 1799
                    E2BIG : 22400
                    EBADF : 7744
                    EACCES : 343
                    EINVAL : 170445
                    ENOSPC : 369
                    EOPNOTSUPP : 1057
                    Type (Hardware 202/26997)(software 324/32251)(tracepoint 107/32351)(Cache 53/25782)(cpu 187/32291)(breakpoint 32/32086)(#6 0/36)(#7 0/26)(#8 0/87)(#9 0/32)(#10 0/22)(#11 0/24)(#12 0/26)(#13 0/19)(#14 0/29)(>14 0/23027)
            Close attempts: 892  Successful: 892
            Read attempts: 912  Successful: 788
            Write attempts: 876  Successful: 0
            Ioctl attempts: 917  Successful: 431
            Mmap attempts: 905  Successful: 306
            Prctl attempts: 902  Successful: 902
            Fork attempts: 444  Successful: 444
            Poll attempts: 927  Successful: 1
            Access attempts: 972  Successful: 487
            Trash mmap attempts: 853  Successful: 853
            Overflows: 0
            SIGIOs due to RT signal queue full: 0
    Iteration 20000
            Open attempts: 224787  Successful: 933
                    EPERM : 16
                    ENOENT : 1915
                    E2BIG : 24151
                    EBADF : 8724
                    EACCES : 376
                    EINVAL : 187128
                    ENOSPC : 428
                    EOPNOTSUPP : 1116
                    Type (Hardware 212/29986)(software 360/35417)(tracepoint 103/35380)(Cache 55/28207)(cpu 179/35181)(breakpoint 24/35199)(#6 0/36)(#7 0/14)(#8 0/103)(#9 0/22)(#10 0/34)(#11 0/27)(#12 0/35)(#13 0/30)(#14 0/35)(>14 0/25081)
            Close attempts: 909  Successful: 909
            Read attempts: 874  Successful: 755
            Write attempts: 871  Successful: 0
            Ioctl attempts: 907  Successful: 435
            Mmap attempts: 933  Successful: 282
            Prctl attempts: 969  Successful: 969
            Fork attempts: 445  Successful: 445
            Poll attempts: 909  Successful: 0
            Access attempts: 899  Successful: 425
            Trash mmap attempts: 929  Successful: 929
            Overflows: 0
            SIGIOs due to RT signal queue full: 0
    Iteration 30000
            Open attempts: 206835  Successful: 877
                    EPERM : 14
                    ENOENT : 1789
                    E2BIG : 22562
                    EBADF : 7880
                    EACCES : 355
                    EINVAL : 171907
                    ENOSPC : 411
                    EOPNOTSUPP : 1040
                    Type (Hardware 175/27601)(software 359/32654)(tracepoint 106/32377)(Cache 37/25798)(cpu 182/32173)(breakpoint 18/32448)(#6 0/35)(#7 0/29)(#8 0/99)(#9 0/26)(#10 0/32)(#11 0/27)(#12 0/32)(#13 0/22)(#14 0/28)(>14 0/23454)
            Close attempts: 903  Successful: 903
            Read attempts: 917  Successful: 811
            Write attempts: 911  Successful: 0
            Ioctl attempts: 901  Successful: 407
            Mmap attempts: 877  Successful: 318
            Prctl attempts: 865  Successful: 865
            Fork attempts: 467  Successful: 467
            Poll attempts: 944  Successful: 0
            Access attempts: 898  Successful: 430
            Trash mmap attempts: 885  Successful: 885
            Overflows: 0
            SIGIOs due to RT signal queue full: 0
    
    ^C
    
    
    [152447.120375] SysRq : Show backtrace of all active CPUs
    [152447.124005] sending NMI to all CPUs:
    [152447.124005] NMI backtrace for cpu 0
    [152447.124005] CPU: 0 PID: 10004 Comm: perf_fuzzer Tainted: G        W      3.17.0-rc7+ #84
    [152447.124005] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015  10/19/2012
    [152447.124005] task: ffff88009d1b9000 ti: ffff88009c2ec000 task.ti: ffff88009c2ec000
    [152447.124005] RIP: 0010:[]  [] delay_tsc+0x1b/0x4e
    [152447.124005] RSP: 0018:ffff88011fc03d78  EFLAGS: 00000046
    [152447.124005] RAX: 0000000000000000 RBX: 0000000000002710 RCX: 000000003a2a18ef
    [152447.124005] RDX: 000000000000005f RSI: 0000000000000000 RDI: 0000000000265906
    [152447.124005] RBP: ffff88011fc03d78 R08: 000000003a2a194e R09: 0000000000000000
    [152447.124005] R10: ffffffff81673c90 R11: 0000000000000000 R12: 0000000000000007
    [152447.124005] R13: 000000000000006c R14: 0000000000000001 R15: 0000000000000046
    [152447.124005] FS:  00007fb8311eb700(0000) GS:ffff88011fc00000(0000) knlGS:0000000000000000
    [152447.124005] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    [152447.124005] CR2: 00007fff79ac1648 CR3: 000000009d7f9000 CR4: 00000000000407f0
    [152447.124005] DR0: 0000000001b3f000 DR1: 0000000001937000 DR2: 0000000000000000
    [152447.124005] DR3: 0000000001b2e000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
    [152447.124005] Stack:
    [152447.124005]  ffff88011fc03d88 ffffffff8129a7c9 ffff88011fc03d98 ffffffff8129a7ef
    [152447.124005]  ffff88011fc03db0 ffffffff8102b4b4 ffffffff81a6e610 ffff88011fc03dc0
    [152447.124005]  ffffffff8131cd31 ffff88011fc03df0 ffffffff8131d2ea ffffffff81c76110
    [152447.124005] Call Trace:
    [152447.124005]   
    [152447.124005]  [] __delay+0xf/0x11
    [152447.124005]  [] __const_udelay+0x24/0x26
    [152447.124005]  [] arch_trigger_all_cpu_backtrace+0xc5/0xd1
    [152447.124005]  [] sysrq_handle_showallcpus+0x13/0x15
    [152447.124005]  [] __handle_sysrq+0x94/0x121
    [152447.124005]  [] handle_sysrq+0x23/0x25
    [152447.124005]  [] serial8250_rx_chars+0x14b/0x1b8
    [152447.124005]  [] serial8250_handle_irq+0x76/0xb4
    [152447.124005]  [] serial8250_default_handle_irq+0x21/0x24
    [152447.124005]  [] serial8250_interrupt+0x3d/0xb2
    [152447.124005]  [] handle_irq_event_percpu+0x43/0x16e
    [152447.124005]  [] ? clockevents_program_event+0x9d/0xb9
    [152447.124005]  [] handle_irq_event+0x3c/0x57
    [152447.124005]  [] handle_edge_irq+0xb1/0xcb
    [152447.124005]  [] handle_irq+0x21/0x2a
    [152447.124005]  [] do_IRQ+0x4e/0xc3
    [152447.124005]  [] common_interrupt+0x6a/0x6a
    [152447.124005]   
    [152447.124005]  [] ? synchronize_srcu_expedited+0x15/0x15
    [152447.124005]  [] ? kmem_cache_alloc_trace+0xcb/0xda
    [152447.124005]  [] ? __call_rcu.constprop.63+0x55/0x1c8
    [152447.124005]  [] kfree_call_rcu+0x1a/0x1c
    [152447.124005]  [] put_ctx+0x50/0x53
    [152447.124005]  [] find_get_context+0x13f/0x170
    [152447.124005]  [] SYSC_perf_event_open+0x47b/0x7f5
    [152447.124005]  [] SyS_perf_event_open+0xe/0x10
    [152447.124005]  [] system_call_fastpath+0x1a/0x1f
    [152447.124005] Code: 90 55 48 8d 3c bf 48 89 e5 e8 b1 ff ff ff 5d c3 66 66 66 66 90 55 48 89 e5 65 8b 34 25 d4 b0 00 00 66 66 90 0f ae e8 0f 31 89 c1 <66> 66 90 0f ae e8 0f 31 48 c1 e2 20 89 c0 48 09 c2 41 89 d0 29 
    
    

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