*** perf_fuzzer 0.31-pre *** by Vince Weaver Linux version 4.1.7-v7+ armv7l Processor: ARMv7 41 0 c07 5 Seeding random number generator with 1449780737 /proc/sys/kernel/perf_event_max_sample_rate currently: 3200/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 1449780737 Pid=26146, 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: ================================================== Cannot open /sys/kernel/tracing/kprobe_events [697154.732210] perf interrupt took too long (39699 > 39062), lowering kernel.perf_event_max_sample_rate to 3200 [699238.916777] INFO: rcu_preempt detected stalls on CPUs/tasks: [699238.922545] 3: (1 GPs behind) idle=42b/140000000000001/0 softirq=1260538/1260539 fqs=2101 [699238.930965] (detected by 2, t=2102 jiffies, g=936169, c=936168, q=307) [699238.937660] Task dump for CPU 3: [699238.940965] perf_fuzzer R running 0 26146 27531 0x00000003 [699238.947433] [<8055985c>] (__schedule) from [<000000ad>] (0xad) [699301.966890] INFO: rcu_preempt detected stalls on CPUs/tasks: [699301.972658] 3: (1 GPs behind) idle=42b/140000000000001/0 softirq=1260538/1260539 fqs=8404 [699301.981078] (detected by 1, t=8408 jiffies, g=936169, c=936168, q=1280) [699301.987859] Task dump for CPU 3: [699301.991165] perf_fuzzer R running 0 26146 27531 0x00000003 [699301.997634] [<8055985c>] (__schedule) from [<000000ad>] (0xad) [699365.017011] INFO: rcu_preempt detected stalls on CPUs/tasks: [699365.022780] 3: (1 GPs behind) idle=42b/140000000000001/0 softirq=1260538/1260539 fqs=14706 [699365.031286] (detected by 1, t=14713 jiffies, g=936169, c=936168, q=2180) [699365.038154] Task dump for CPU 3: [699365.041459] perf_fuzzer R running 0 26146 27531 0x00000003 [699365.047929] [<8055985c>] (__schedule) from [<000000ad>] (0xad) [699428.067134] INFO: rcu_preempt detected stalls on CPUs/tasks: [699428.072902] 3: (1 GPs behind) idle=42b/140000000000001/0 softirq=1260538/1260539 fqs=21007 [699428.081409] (detected by 2, t=21017 jiffies, g=936169, c=936168, q=3151)
Using user-specified random seed of 1411488270
*** perf_fuzzer 0.29-pre *** by Vince Weaver
Linux version 3.17.0-rc6+ aarch64
Processor: UNKNOWN 0/0/0
Seeding random number generator with 1411488270
/proc/sys/kernel/perf_event_max_sample_rate currently: 285518974/s
/proc/sys/kernel/perf_event_paranoid currently: 1142898651
Logging perf_event_open() failures: no
Running fsync after every syscall: no
To reproduce, try: ./perf_fuzzer -r 1411488270
Pid=18435, 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:
==================================================
... userspace output removed ...
INFO: rcu_preempt self-detected stall on CPU { 3} (t=2100 jiffies g=73728
c=73727 q=90)
Task dump for CPU 3:
swapper/3 R running task 0 0 1 0x00000002
Call trace:
[] dump_backtrace+0x0/0x130
[] show_stack+0x10/0x1c
[] sched_show_task+0xe0/0x134
[] dump_cpu_task+0x3c/0x4c
[] rcu_dump_cpu_stacks+0x98/0xe8
[] rcu_check_callbacks+0x4b0/0x8c4
[] update_process_times+0x48/0x78
[] tick_sched_handle.isra.18+0x1c/0x68
[] tick_sched_timer+0x4c/0x78
[] __run_hrtimer.isra.33+0x48/0x104
[] hrtimer_interrupt+0x104/0x29c
[] arch_timer_handler_phys+0x28/0x38
[] handle_percpu_devid_irq+0x90/0xb8
[] generic_handle_irq+0x30/0x4c
[] handle_IRQ+0x68/0xe0
[] gic_handle_irq+0x3c/0x80
Exception stack(0xffffffc975d67bf0 to 0xffffffc975d67d10)
7be0: 75d64000 ffffffc9 006d9dd8
ffffffc0
7c00: 75d67d30 ffffffc9 000af0b8 ffffffc0 000000c0 00000000 0073be00
7c20: 75d67ce0 ffffffc9 00000101 00000000 0040b168 ffffffc0 00000020
00000000
7c40: 0ccccccd 00000000 006d8a28 ffffffc0 006d8a20 ffffffc0 00000001
00000000
7c60: 00000000 00000000 75d59340 ffffffc9 00000001 00000000 00000068
00000000
7c80: 0000004c 00000000 00000033 00000000 00000019 00000000 00000001
00000000
7ca0: 0000000e 00000000 75d64000 ffffffc9 006d9dd8 ffffffc0 75d64000
ffffffc9
7cc0: 006e2000 ffffffc0 0000001e 00000000 00000000 00000000 00000001
00000000
7ce0: 006d8a28 ffffffc0 00000002 00000000 006d8a20 ffffffc0 75d67d30
ffffffc9
7d00: 000af0a4 ffffffc0 75d67d30 ffffffc9
[] el1_irq+0x60/0xd0
[] irq_exit+0x8c/0xc0
[] handle_IRQ+0x6c/0xe0
[] gic_handle_irq+0x3c/0x80
Exception stack(0xffffffc975d67e30 to 0xffffffc975d67f50)
7e20: 75d64000 ffffffc9 0073d448
ffffffc0
7e40: 75d67f70 ffffffc9 000852d0 ffffffc0 00000000 00000000 006309d0
ffffffc0
7e60: 75d67f00 ffffffc9 00000001 00000000 00000008 00000000 00000001
00000000
7e80: 000fb068 ffffffc0 00000000 00000000 75d59d08 ffffffc9 00000001
00000000
7ea0: 00000000 00000000 75d59340 ffffffc9 00000001 00000000 00000004
00000000
7ec0: 00000000 00000000 963875a0 0000007f 001aa6c4 ffffffc0 962ff50c
0000007f
7ee0: ebb9a680 0000007f 75d64000 ffffffc9 0073d448 ffffffc0 00508000
ffffffc0
7f00: 0066bc18 ffffffc0 00738387 ffffffc0 00621fa8 ffffffc0 00000001
00000000
7f20: 81172000 00000000 00080330 ffffffc0 80000000 00000040 75d67f70
ffffffc9
7f40: 000852cc ffffffc0 75d67f70 ffffffc9
[] el1_irq+0x60/0xd0
[] cpu_startup_entry+0xfc/0x154
[] secondary_start_kernel+0x110/0x120
NMI watchdog: BUG: soft lockup - CPU#3 stuck for 23s! [swapper/3:0]
Modules linked in:
CPU: 3 PID: 0 Comm: swapper/3 Not tainted 3.17.0-rc6+ #82
task: ffffffc975d59340 ti: ffffffc975d64000 task.ti: ffffffc975d64000
PC is at __do_softirq+0xac/0x27c
LR is at __do_softirq+0x98/0x27c
pc : [] lr : [] pstate: 80000145
sp : ffffffc975d67d30
x29: ffffffc975d67d30 x28: ffffffc0006d8a20
x27: 0000000000000002 x26: ffffffc0006d8a28
x25: 0000000000000001 x24: 0000000000000000
x23: 000000000000001e x22: ffffffc0006e2000
x21: ffffffc975d64000 x20: ffffffc0006d9dd8
x19: ffffffc975d64000 x18: 000000000000000e
x17: 0000000000000001 x16: 0000000000000019
x15: 0000000000000033 x14: 000000000000004c
x13: 0000000000000068 x12: 0000000000000001
x11: ffffffc975d59340 x10: 0000000000000000
x9 : 0000000000000001 x8 : ffffffc0006d8a20
x7 : ffffffc0006d8a28 x6 : 000000000ccccccd
x5 : 0000000000000020 x4 : ffffffc00040b168
x3 : 0000000000000101 x2 : ffffffc975d67ce0
x1 : ffffffc00073be00 x0 : 00000000000000c0
SysRq : Show backtrace of all active CPUs
CPU0:
CPU: 0 PID: 0 Comm: swapper/0 Tainted: G L 3.17.0-rc6+ #82
task: ffffffc0006e8a20 ti: ffffffc0006dc000 task.ti: ffffffc0006dc000
PC is at arch_cpu_idle+0x10/0x18
LR is at arch_cpu_idle+0xc/0x18
pc : [] lr : [] pstate: 60000145
sp : ffffffc0006dff20
x29: ffffffc0006dff20 x28: 0000004080000000
x27: ffffffc000080578 x26: 0000000081172000
x25: 0000000000000001 x24: ffffffc000621fa8
x23: ffffffc000738387 x22: ffffffc00066bc18
x21: ffffffc000508000 x20: ffffffc00073d448
x19: ffffffc0006dc000 x18: 000000000000000d
x17: 0000007fb48d47a0 x16: ffffffc0001975ec
x15: ffffffffffffffed x14: 000000000000000d
x13: fffffffffffffe09 x12: 0000000000000001
x11: ffffffc0006e8a20 x10: 0000000000000000
x9 : 0000000000000001 x8 : ffffffc0006e93e8
x7 : 0000000000000000 x6 : ffffffc000108b2c
x5 : 0000000000000000 x4 : ffffffc0006f7700
x3 : 0000000000000001 x2 : ffffffc0006dfeb0
x1 : ffffffc0006309d0 x0 : 0000000000000000
CPU3:
Processed 0 softirqs recently, 143066 total
Call trace:
[] dump_backtrace+0x0/0x130
[] show_stack+0x10/0x1c
[] showacpu+0xe4/0x11c
[] flush_smp_call_function_queue+0x90/0x180
[] generic_smp_call_function_single_interrupt+0xc/0x18
[] handle_IPI+0xe4/0x174
[] gic_handle_irq+0x78/0x80
Exception stack(0xffffffc975d67bf0 to 0xffffffc975d67d10)
7be0: 75d64000 ffffffc9 006d9dd8
ffffffc0
7c00: 75d67d30 ffffffc9 000af0b8 ffffffc0 000000c0 00000000 0073be00
ffffffc0
7c20: 75d67ce0 ffffffc9 00000101 00000000 0040b168 ffffffc0 00000020
00000000
7c40: 0ccccccd 00000000 006d8a28 ffffffc0 006d8a20 ffffffc0 00000001
00000000
7c60: 00000000 00000000 75d59340 ffffffc9 00000001 00000000 00000068
00000000
7c80: 0000004c 00000000 00000033 00000000 00000019 00000000 00000001
00000000
7ca0: 0000000e 00000000 75d64000 ffffffc9 006d9dd8 ffffffc0 75d64000
ffffffc9
7cc0: 006e2000 ffffffc0 0000001e 00000000 00000000 00000000 00000001
00000000
7ce0: 006d8a28 ffffffc0 00000002 00000000 006d8a20 ffffffc0 75d67d30
ffffffc9
7d00: 000af0a4 ffffffc0 75d67d30 ffffffc9
[] el1_irq+0x60/0xd0
[] irq_exit+0x8c/0xc0
[] handle_IRQ+0x6c/0xe0
[] gic_handle_irq+0x3c/0x80
Exception stack(0xffffffc975d67e30 to 0xffffffc975d67f50)
7e20: 75d64000 ffffffc9 0073d448
ffffffc0
7e40: 75d67f70 ffffffc9 000852d0 ffffffc0 00000000 00000000 006309d0
ffffffc0
7e60: 75d67f00 ffffffc9 00000001 00000000 00000008 00000000 00000001
00000000
7e80: 000fb068 ffffffc0 00000000 00000000 75d59d08 ffffffc9 00000001
00000000
7ea0: 00000000 00000000 75d59340 ffffffc9 00000001 00000000 00000004
00000000
7ec0: 00000000 00000000 963875a0 0000007f 001aa6c4 ffffffc0 962ff50c
0000007f
7ee0: ebb9a680 0000007f 75d64000 ffffffc9 0073d448 ffffffc0 00508000
ffffffc0
7f00: 0066bc18 ffffffc0 00738387 ffffffc0 00621fa8 ffffffc0 00000001
00000000
7f20: 81172000 00000000 00080330 ffffffc0 80000000 00000040 75d67f70
ffffffc9
7f40: 000852cc ffffffc0 75d67f70 ffffffc9
[] el1_irq+0x60/0xd0
[] cpu_startup_entry+0xfc/0x154
[] secondary_start_kernel+0x110/0x120