Re: [testcase] perf: yet another fuzzer triggered crash

From: Vince Weaver
Date: Fri Jun 28 2013 - 15:30:37 EST

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On Fri, 14 Jun 2013, Vince Weaver wrote:

> OK, I haven't managed to get a small reproducible test case for the system
> crash yet

I wasted the last 2 days bisecting a 10000 syscall trace, but below is a
20-syscall testcase that rapidly makes a core2 machine running 3.10-rc7
unusable.

You may have to run this twice (first triggers WARNING second crashes the
machine).

/* This code quickly causes 3.10-rc7 on core2 to get stuck */
/* process never ends, lots of garbage in logs, can't reboot */
/* see the error log at end. */

/* log_to_code output from ./bad.trace.bisect54 */
/* by Vince Weaver <vincent.weaver _at_ maine.edu */

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include <sys/ioctl.h>
#include <sys/prctl.h>
#include <linux/hw_breakpoint.h>
#include <linux/perf_event.h>

int fd[1024];
struct perf_event_attr pe[1024];

int forked_pid;

int perf_event_open(struct perf_event_attr *hw_event_uptr,
pid_t pid, int cpu, int group_fd, unsigned long flags) {

return syscall(__NR_perf_event_open,hw_event_uptr, pid, cpu,
group_fd, flags);
}

int main(int argc, char **argv) {
/* 1 */

memset(&pe[29],0,sizeof(struct perf_event_attr));
pe[29].type=PERF_TYPE_HW_CACHE;
pe[29].size=96;
pe[29].config=PERF_COUNT_HW_CACHE_DTLB | ( PERF_COUNT_HW_CACHE_OP_READ << 8) | ( PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16 );
pe[29].sample_type=0; /* 0 */
pe[29].read_format=PERF_FORMAT_GROUP; /* 8 */
pe[29].pinned=1;
pe[29].exclude_kernel=1;
pe[29].exclude_hv=1;
pe[29].exclude_idle=1;
pe[29].mmap=1;
pe[29].freq=1;
pe[29].inherit_stat=1;
pe[29].watermark=1;
pe[29].precise_ip=0; /* arbitrary skid */
pe[29].wakeup_watermark=0;
pe[29].bp_type=HW_BREAKPOINT_EMPTY;

fd[29]=perf_event_open(&pe[29],0,0,-1,PERF_FLAG_FD_NO_GROUP /*1*/ );

/* 2 */

memset(&pe[42],0,sizeof(struct perf_event_attr));
pe[42].type=PERF_TYPE_SOFTWARE;
pe[42].size=80;
pe[42].config=PERF_COUNT_SW_TASK_CLOCK;
pe[42].sample_type=0; /* 0 */
pe[42].read_format=PERF_FORMAT_TOTAL_TIME_ENABLED|PERF_FORMAT_TOTAL_TIME_RUNNING|PERF_FORMAT_ID; /* 7 */
pe[42].inherit=1;
pe[42].exclusive=1;
pe[42].exclude_kernel=1;
pe[42].exclude_idle=1;
pe[42].freq=1;
pe[42].task=1;
pe[42].watermark=1;
pe[42].precise_ip=3; /* must have zero skid */
pe[42].sample_id_all=1;
pe[42].exclude_host=1;
pe[42].wakeup_watermark=0;
pe[42].bp_type=HW_BREAKPOINT_EMPTY;

fd[42]=perf_event_open(&pe[42],0,0,-1,0 /*0*/ );

/* 3 */
forked_pid=fork();
if (forked_pid==0) while(1);
/* 4 */
prctl(PR_TASK_PERF_EVENTS_DISABLE);
/* 5 */
kill(forked_pid,SIGKILL);
/* 6 */
prctl(PR_TASK_PERF_EVENTS_ENABLE);
/* 7 */

memset(&pe[15],0,sizeof(struct perf_event_attr));
pe[15].type=PERF_TYPE_SOFTWARE;
pe[15].config=PERF_COUNT_SW_TASK_CLOCK;
pe[15].sample_type=0; /* 0 */
pe[15].read_format=PERF_FORMAT_ID; /* 4 */
pe[15].disabled=1;
pe[15].inherit=1;
pe[15].exclude_user=1;
pe[15].exclude_hv=1;
pe[15].enable_on_exec=1;
pe[15].task=1;
pe[15].watermark=1;
pe[15].precise_ip=2; /* request zero skid */
pe[15].mmap_data=1;
pe[15].sample_id_all=1;
pe[15].exclude_guest=1;
pe[15].wakeup_watermark=0;
pe[15].bp_type=HW_BREAKPOINT_EMPTY;

fd[15]=perf_event_open(&pe[15],0,0,fd[29],0 /*0*/ );

/* 8 */
close(fd[29]);
/* 9 */

memset(&pe[12],0,sizeof(struct perf_event_attr));
pe[12].type=PERF_TYPE_SOFTWARE;
pe[12].config=PERF_COUNT_SW_TASK_CLOCK;
pe[12].sample_type=0; /* 0 */
pe[12].read_format=PERF_FORMAT_TOTAL_TIME_ENABLED|PERF_FORMAT_ID; /* 5 */
pe[12].disabled=1;
pe[12].inherit=1;
pe[12].exclusive=1;
pe[12].mmap=1;
pe[12].freq=1;
pe[12].enable_on_exec=1;
pe[12].watermark=1;
pe[12].precise_ip=0; /* arbitrary skid */
pe[12].mmap_data=1;
pe[12].exclude_guest=1;
pe[12].wakeup_watermark=0;
pe[12].bp_type=HW_BREAKPOINT_EMPTY;

fd[12]=perf_event_open(&pe[12],0,0,-1,PERF_FLAG_FD_NO_GROUP /*1*/ );

/* 10 */
prctl(PR_TASK_PERF_EVENTS_DISABLE);
/* 11 */
prctl(PR_TASK_PERF_EVENTS_ENABLE);
/* 12 */

memset(&pe[4],0,sizeof(struct perf_event_attr));
pe[4].type=PERF_TYPE_SOFTWARE;
pe[4].size=96;
pe[4].config=PERF_COUNT_SW_TASK_CLOCK;
pe[4].sample_type=0; /* 0 */
pe[4].read_format=PERF_FORMAT_TOTAL_TIME_ENABLED|PERF_FORMAT_TOTAL_TIME_RUNNING|PERF_FORMAT_ID; /* 7 */
pe[4].pinned=1;
pe[4].exclude_user=1;
pe[4].exclude_hv=1;
pe[4].exclude_idle=1;
pe[4].mmap=1;
pe[4].freq=1;
pe[4].inherit_stat=1;
pe[4].task=1;
pe[4].precise_ip=0; /* arbitrary skid */
pe[4].wakeup_events=0;
pe[4].bp_type=HW_BREAKPOINT_EMPTY;

fd[4]=perf_event_open(&pe[4],0,0,-1,0 /*0*/ );

/* 13 */

memset(&pe[7],0,sizeof(struct perf_event_attr));
pe[7].type=PERF_TYPE_SOFTWARE;
pe[7].size=96;
pe[7].config=PERF_COUNT_SW_TASK_CLOCK;
pe[7].sample_type=0; /* 0 */
pe[7].read_format=PERF_FORMAT_TOTAL_TIME_ENABLED|PERF_FORMAT_GROUP; /* 9 */
pe[7].exclusive=1;
pe[7].exclude_user=1;
pe[7].exclude_kernel=1;
pe[7].exclude_hv=1;
pe[7].exclude_idle=1;
pe[7].comm=1;
pe[7].inherit_stat=1;
pe[7].precise_ip=1; /* constant skid */
pe[7].exclude_host=1;
pe[7].wakeup_events=0;
pe[7].bp_type=HW_BREAKPOINT_EMPTY;

fd[7]=perf_event_open(&pe[7],0,0,-1,PERF_FLAG_FD_NO_GROUP /*1*/ );

/* 14 */
forked_pid=fork();
if (forked_pid==0) while(1);
/* 15 */
kill(forked_pid,SIGKILL);
/* 16 */
forked_pid=fork();
if (forked_pid==0) while(1);
/* 17 */
kill(forked_pid,SIGKILL);
/* 18 */
close(fd[4]);
/* 19 */

memset(&pe[4],0,sizeof(struct perf_event_attr));
pe[4].type=PERF_TYPE_HARDWARE;
pe[4].size=72;
pe[4].config=PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
pe[4].sample_type=0; /* 0 */
pe[4].read_format=PERF_FORMAT_TOTAL_TIME_ENABLED|PERF_FORMAT_TOTAL_TIME_RUNNING|PERF_FORMAT_ID; /* 7 */
pe[4].exclude_user=1;
pe[4].exclude_idle=1;
pe[4].enable_on_exec=1;
pe[4].precise_ip=0; /* arbitrary skid */
pe[4].mmap_data=1;
pe[4].exclude_host=1;
pe[4].exclude_guest=1;
pe[4].wakeup_events=0;
pe[4].bp_type=HW_BREAKPOINT_EMPTY;

fd[4]=perf_event_open(&pe[4],0,0,-1,PERF_FLAG_FD_OUTPUT /*2*/ );

/* 20 */
prctl(PR_TASK_PERF_EVENTS_DISABLE);
/* Replayed 20 syscalls */
return 0;
}

/*

Message from syslogd@core2 at Jun 28 15:11:34 ...
kernel:[ 140.248002] BUG: soft lockup - CPU#1 stuck for 23s! [out:3049]

Message from syslogd@core2 at Jun 28 15:12:02 ...
kernel:[ 168.248002] BUG: soft lockup - CPU#1 stuck for 22s! [out:3049]

Message from syslogd@core2 at Jun 28 15:12:38 ...
kernel:[ 204.248002] BUG: soft lockup - CPU#1 stuck for 24s! [out:3049]

Message from syslogd@core2 at Jun 28 15:13:06 ...
kernel:[ 232.248002] BUG: soft lockup - CPU#1 stuck for 23s! [out:3049]

Message from syslogd@core2 at Jun 28 15:13:38 ...
kernel:[ 264.248002] BUG: soft lockup - CPU#1 stuck for 22s! [out:3049]

[ 82.239623] ------------[ cut here ]------------
[ 82.243537] WARNING: at kernel/events/core.c:2122 task_ctx_sched_out+0x3c/0x)
[ 82.243537] Modules linked in: nfsd auth_rpcgss oid_registry nfs_acl nfs locn
[ 82.243537] CPU: 0 PID: 3047 Comm: out Not tainted 3.10.0-rc7 #1
[ 82.243537] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BI2
[ 82.243537] 0000000000000000 ffffffff8102e0f5 0000000000000000 ffff88011fc18
[ 82.243537] ffff88011799b040 0000000000000000 ffff8801177acecc ffffffff810af
[ 82.243537] ffff8801177acec0 ffffffff810af06f 0000000000000009 ffff880117990
[ 82.243537] Call Trace:
[ 82.243537] [<ffffffff8102e0f5>] ? warn_slowpath_common+0x5b/0x70
[ 82.243537] [<ffffffff810ab2ff>] ? task_ctx_sched_out+0x3c/0x5f
[ 82.243537] [<ffffffff810af06f>] ? perf_event_exit_task+0xbf/0x194
[ 82.243537] [<ffffffff8103291b>] ? do_exit+0x3ef/0x90c
[ 82.243537] [<ffffffff810ce101>] ? do_wp_page+0x275/0x5a6
[ 82.243537] [<ffffffff81032ec2>] ? do_group_exit+0x66/0x98
[ 82.243537] [<ffffffff8103dab9>] ? get_signal_to_deliver+0x479/0x4ad
[ 82.243537] [<ffffffff810cdd50>] ? __pte_alloc+0x83/0xf2
[ 82.243537] [<ffffffff8100205d>] ? do_signal+0x3c/0x432
[ 82.243537] [<ffffffff813682a0>] ? __do_page_fault+0x31c/0x3ba
[ 82.243537] [<ffffffff81002473>] ? do_notify_resume+0x20/0x5d
[ 82.243537] [<ffffffff813656f5>] ? retint_signal+0x3d/0x78
[ 82.243537] ---[ end trace 6e0d112623f126d5 ]---
[ 111.664002] INFO: rcu_sched self-detected stall on CPU[ 111.676008] INFO: r)
[ 111.676018] sending NMI to all CPUs:
[ 111.664002] NMI backtrace for cpu 1
[ 111.664002] CPU: 1 PID: 3049 Comm: out Tainted: G W 3.10.0-rc7 #1
[ 111.664002] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BI2
[ 111.664002] task: ffff880117b62080 ti: ffff880117a6a000 task.ti: ffff880117a0
[ 111.664002] RIP: 0010:[<ffffffff811b8deb>] [<ffffffff811b8deb>] delay_tsc+06
[ 111.664002] RSP: 0018:ffff88011fc83ca0 EFLAGS: 00000083
[ 111.664002] RAX: 000000000dfb29b6 RBX: ffffffff8183c770 RCX: 000000000dfb218c
[ 111.664002] RDX: 000000000000082a RSI: 0000000000000001 RDI: 00000000000009d2
[ 111.664002] RBP: 000000000000270b R08: 0000000000000001 R09: ffffffff817caa1f
[ 111.664002] R10: 0000000000000000 R11: 0000000000000200 R12: 0000000000000020
[ 111.664002] R13: ffffffff812465bc R14: 0000000000000039 R15: 0000000000000039
[ 111.664002] FS: 00007fa834fef700(0000) GS:ffff88011fc80000(0000) knlGS:00000
[ 111.664002] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 111.664002] CR2: 0000000000600e70 CR3: 00000001171da000 CR4: 00000000000407e0
[ 111.664002] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 111.664002] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 111.664002] Stack:
[ 111.664002] ffffffff81246578 ffffffff8183c770 000000000000006c ffffffff81830
[ 111.664002] ffffffff812465cd ffffffff817caa41 ffffffff817caa10 ffffffff81245
[ 111.664002] ffffffff8183c770 0000000000000000 0000000000000016 0000000000001
[ 111.664002] Call Trace:
[ 111.664002] <IRQ> [<ffffffff81246578>] ? wait_for_xmitr+0x3d/0x81
[ 111.664002] [<ffffffff812465cd>] ? serial8250_console_putchar+0x11/0x1f
[ 111.664002] [<ffffffff81242285>] ? uart_console_write+0x35/0x47
[ 111.664002] [<ffffffff81246679>] ? serial8250_console_write+0x9e/0xe9
[ 111.664002] [<ffffffff8102ea40>] ? call_console_drivers.constprop.22+0x9e/0e
[ 111.664002] [<ffffffff8102f8b0>] ? console_unlock+0x12e/0x2f9
[ 111.664002] [<ffffffff8102ffa6>] ? vprintk_emit+0x3ab/0x3d6
[ 111.664002] [<ffffffff8135fc3f>] ? printk+0x4f/0x51
[ 111.664002] [<ffffffff8109273e>] ? rcu_check_callbacks+0x106/0x4bb
[ 111.664002] [<ffffffff8106b90e>] ? tick_sched_do_timer+0x25/0x25
[ 111.664002] [<ffffffff8103a92f>] ? update_process_times+0x31/0x5c
[ 111.664002] [<ffffffff8106b672>] ? tick_sched_handle+0x3e/0x4a
[ 111.664002] [<ffffffff8106b93e>] ? tick_sched_timer+0x30/0x4c
[ 111.664002] [<ffffffff8104be54>] ? __run_hrtimer+0xa9/0x14e
[ 111.664002] [<ffffffff8104c461>] ? hrtimer_interrupt+0xbd/0x19e
[ 111.664002] [<ffffffff810a9c9f>] ? perf_remove_from_context+0x89/0x89
[ 111.664002] [<ffffffff8101bc60>] ? smp_apic_timer_interrupt+0x6d/0x7e
[ 111.664002] [<ffffffff8136b00a>] ? apic_timer_interrupt+0x6a/0x70
[ 111.664002] <EOI> [<ffffffff810aa81a>] ? group_sched_out+0x62/0x62
[ 111.664002] [<ffffffff810a9d03>] ? perf_event_disable+0x64/0x92
[ 111.664002] [<ffffffff810a830a>] ? perf_event_for_each_child+0x62/0x83
[ 111.664002] [<ffffffff810ab3da>] ? perf_event_task_disable+0x3f/0x6d
[ 111.664002] [<ffffffff8104184c>] ? SyS_prctl+0x16a/0x32f
[ 111.664002] [<ffffffff8136a452>] ? system_call_fastpath+0x16/0x1b
[ 111.664002] Code: 3c bf e9 cb ff ff ff 65 8b 34 25 c4 b0 00 00 66 66 90 0f a
[ 111.676334] NMI backtrace for cpu 0
[ 111.676339] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 3.10.0-rc7 1
[ 111.676341] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BI2
[ 111.676345] task: ffffffff81610400 ti: ffffffff81600000 task.ti: ffffffff8160
[ 111.676348] RIP: 0010:[<ffffffff811b8d9b>] [<ffffffff811b8d9b>] __const_ude0
[ 111.676357] RSP: 0018:ffff88011fc03e60 EFLAGS: 00000046
[ 111.676360] RAX: 0000000000000000 RBX: 0000000000002710 RCX: 0000000000000040
[ 111.676363] RDX: 00000000009aa06c RSI: 0000000000000200 RDI: 0000000000418958
[ 111.676365] RBP: ffff88011fc0d9a0 R08: 0000000000000000 R09: ffffffff817b87ec
[ 111.676368] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81637dc0
[ 111.676371] R13: 0000000000000001 R14: ffffffff81600000 R15: ffffffff81637e80
[ 111.676374] FS: 0000000000000000(0000) GS:ffff88011fc00000(0000) knlGS:00000
[ 111.676377] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 111.676380] CR2: 00007fa834dd8a60 CR3: 00000001176de000 CR4: 00000000000407f0
[ 111.676383] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 111.676385] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 111.676387] Stack:
[ 111.676388] ffffffff8101c67f ffffffff81637dc0 ffffffff81092a14 0000000000002
[ 111.676394] 0000000000000083 0000000000000000 ffffffff81610400 0000000000000
[ 111.676399] 0000000000000000 ffff88011fc0d370 ffffffff8106b90e ffff88011fc00
[ 111.676405] Call Trace:
[ 111.676407] <IRQ> [<ffffffff8101c67f>] ? arch_trigger_all_cpu_backtrace+0xf
[ 111.676416] [<ffffffff81092a14>] ? rcu_check_callbacks+0x3dc/0x4bb
[ 111.676424] [<ffffffff8106b90e>] ? tick_sched_do_timer+0x25/0x25
[ 111.676429] [<ffffffff8103a92f>] ? update_process_times+0x31/0x5c
[ 111.676436] [<ffffffff8106b672>] ? tick_sched_handle+0x3e/0x4a
[ 111.676441] [<ffffffff8106b93e>] ? tick_sched_timer+0x30/0x4c
[ 111.676447] [<ffffffff8104be54>] ? __run_hrtimer+0xa9/0x14e
[ 111.676452] [<ffffffff8104c461>] ? hrtimer_interrupt+0xbd/0x19e
[ 111.676458] [<ffffffff8101bc60>] ? smp_apic_timer_interrupt+0x6d/0x7e
[ 111.676464] [<ffffffff8136b00a>] ? apic_timer_interrupt+0x6a/0x70
[ 111.676470] <EOI> [<ffffffff81008184>] ? default_idle+0x14/0x3a
[ 111.676480] [<ffffffff810086ec>] ? arch_cpu_idle+0x5/0x14
[ 111.676486] [<ffffffff8106465d>] ? cpu_startup_entry+0x103/0x176
[ 111.676493] [<ffffffff816aacaf>] ? start_kernel+0x3d6/0x3e1
[ 111.676499] [<ffffffff816aa6fb>] ? repair_env_string+0x54/0x54
[ 111.676505] Code: eb 0e 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 48 ff c8 7
[ 111.664002] { 1} (t=5733 jiffies g=359 c=358 q=18)
[ 111.664002] sending NMI to all CPUs:
[ 111.664002] NMI backtrace for cpu 1
[ 111.664002] CPU: 1 PID: 3049 Comm: out Tainted: G W 3.10.0-rc7 #1
[ 111.664002] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BI2
[ 111.664002] task: ffff880117b62080 ti: ffff880117a6a000 task.ti: ffff880117a0
[ 111.664002] RIP: 0010:[<ffffffff811b8ddf>] [<ffffffff811b8ddf>] delay_tsc+06
[ 111.664002] RSP: 0018:ffff88011fc83e60 EFLAGS: 00000847
[ 111.664002] RAX: 00000000357ac791 RBX: 0000000000002710 RCX: 00000000357ac791
[ 111.664002] RDX: 000000000000004f RSI: 0000000000000001 RDI: 0000000000265903
[ 111.664002] RBP: ffff88011fc8d9a0 R08: 0000000000000000 R09: 0000000000000000
[ 111.664002] R10: 00000000ffffffff R11: ffff880118676260 R12: ffffffff81637dc0
[ 111.664002] R13: ffff88011fc8d370 R14: ffff880117a6a000 R15: 0000000000000001
[ 111.664002] FS: 00007fa834fef700(0000) GS:ffff88011fc80000(0000) knlGS:00000
[ 111.664002] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 111.664002] CR2: 0000000000600e70 CR3: 00000001171da000 CR4: 00000000000407e0
[ 111.664002] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 111.664002] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 111.664002] Stack:
[ 111.664002] ffffffff8101c67f ffffffff81637dc0 ffffffff810927dc 0000000000002
[ 111.664002] 0000000000353d39 0000000000000001 ffff880117b62080 0000000000000
[ 111.664002] 0000000000000001 ffff88011fc8d370 ffffffff8106b90e ffff88011fc80
[ 111.664002] Call Trace:
[ 111.664002] <IRQ>
[ 111.664002] [<ffffffff8101c67f>] ? arch_trigger_all_cpu_backtrace+0x76/0x7f
[ 111.664002] [<ffffffff810927dc>] ? rcu_check_callbacks+0x1a4/0x4bb
[ 111.664002] [<ffffffff8106b90e>] ? tick_sched_do_timer+0x25/0x25
[ 111.664002] [<ffffffff8103a92f>] ? update_process_times+0x31/0x5c
[ 111.664002] [<ffffffff8106b672>] ? tick_sched_handle+0x3e/0x4a
[ 111.664002] [<ffffffff8106b93e>] ? tick_sched_timer+0x30/0x4c
[ 111.664002] [<ffffffff8104be54>] ? __run_hrtimer+0xa9/0x14e
[ 111.664002] [<ffffffff8104c461>] ? hrtimer_interrupt+0xbd/0x19e
[ 111.664002] [<ffffffff810a9c9f>] ? perf_remove_from_context+0x89/0x89
[ 111.664002] [<ffffffff8101bc60>] ? smp_apic_timer_interrupt+0x6d/0x7e
[ 111.664002] [<ffffffff8136b00a>] ? apic_timer_interrupt+0x6a/0x70
[ 111.664002] <EOI>
[ 111.664002] [<ffffffff810aa81a>] ? group_sched_out+0x62/0x62
[ 111.664002] [<ffffffff810a9d03>] ? perf_event_disable+0x64/0x92
[ 111.664002] [<ffffffff810a830a>] ? perf_event_for_each_child+0x62/0x83
[ 111.664002] [<ffffffff810ab3da>] ? perf_event_task_disable+0x3f/0x6d
[ 111.664002] [<ffffffff8104184c>] ? SyS_prctl+0x16a/0x32f
[ 111.664002] [<ffffffff8136a452>] ? system_call_fastpath+0x16/0x1b
[ 111.664002] Code: ff c7 10 00 00 e9 d4 ff ff ff 48 8d 3c bf e9 cb ff ff ff 6
[ 113.636004] NMI backtrace for cpu 0
[ 113.636004] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 3.10.0-rc7 1
[ 113.636004] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BI2
[ 113.636004] task: ffffffff81610400 ti: ffffffff81600000 task.ti: ffffffff8160
[ 113.636004] RIP: 0010:[<ffffffff81008184>] [<ffffffff81008184>] default_idla
[ 113.636004] RSP: 0018:ffffffff81601f98 EFLAGS: 00000246
[ 113.636004] RAX: 0000000000000000 RBX: ffffffff81601fd8 RCX: 00000000ffffffff
[ 113.636004] RDX: 0100000000000000 RSI: 0000000000000000 RDI: ffff88011fc0d81c
[ 113.636004] RBP: ffffffff81601fd8 R08: 0000000000000000 R09: 0000000000000000
[ 113.636004] R10: 0000000000000001 R11: 0000000000000002 R12: ffffffff817332d0
[ 113.636004] R13: ffff88011ffad540 R14: 0000000000000000 R15: 0000000000000000
[ 113.636004] FS: 0000000000000000(0000) GS:ffff88011fc00000(0000) knlGS:00000
[ 113.636004] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 113.636004] CR2: 00007fa834dd8a60 CR3: 0000000117988000 CR4: 00000000000407f0
[ 113.636004] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 113.636004] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 113.636004] Stack:
[ 113.636004] ffffffff8106465d 516a4e0130c2f192 ffffffffffffffff ffffffff81720
[ 113.636004] ffffffff816aacaf ffffffff816aa6fb ffffffff817332d0 0000000000000
[ 113.636004] 0000000000000000 0000000000000000 0000000000000000 0000000000000
[ 113.636004] Call Trace:
[ 113.636004] [<ffffffff8106465d>] ? cpu_startup_entry+0x103/0x176
[ 113.636004] [<ffffffff816aacaf>] ? start_kernel+0x3d6/0x3e1
[ 113.636004] [<ffffffff816aa6fb>] ? repair_env_string+0x54/0x54
[ 113.636004] Code: 08 00 48 8b 7b 08 44 89 e2 89 ee ff 13 48 83 c3 10 48 83 3
[ 140.248002] BUG: soft lockup - CPU#1 stuck for 23s! [out:3049]
[ 140.248002] Modules linked in: nfsd auth_rpcgss oid_registry nfs_acl nfs locn
[ 140.248002] CPU: 1 PID: 3049 Comm: out Tainted: G W 3.10.0-rc7 #1
[ 140.248002] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BI2
[ 140.248002] task: ffff880117b62080 ti: ffff880117a6a000 task.ti: ffff880117a0
[ 140.248002] RIP: 0010:[<ffffffff810a9d03>] [<ffffffff810a9d03>] perf_event_2
[ 140.248002] RSP: 0018:ffff880117a6bed0 EFLAGS: 00000282
[ 140.248002] RAX: 0000000000000001 RBX: 00007fa834b12259 RCX: 0000000000000001
[ 140.248002] RDX: 000000000000fe0d RSI: ffffffff810aa81a RDI: ffff8801177ac7cc
[ 140.248002] RBP: ffff8801177ac7cc R08: 0000000000000002 R09: 0000000000602000
[ 140.248002] R10: 00007fa834b12259 R11: 0000000000000246 R12: 0000000000000002
[ 140.248002] R13: ffff8801177ac7cc R14: 00007fa834b12259 R15: 0000000000000246
[ 140.248002] FS: 00007fa834fef700(0000) GS:ffff88011fc80000(0000) knlGS:00000
[ 140.248002] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 140.248002] CR2: 0000000000600e70 CR3: 00000001171da000 CR4: 00000000000407e0
[ 140.248002] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 140.248002] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 140.248002] Stack:
[ 140.248002] ffff880118b96400 ffff880117abf400 ffff880118b965d0 ffffffff810aa
[ 140.248002] ffff880118b96400 ffff880117b62080 ffff880117b62708 0000000000002
[ 140.248002] ffffffff810ab3da 0000000000000000 0000000000000000 ffff880117b60
[ 140.248002] Call Trace:
[ 140.248002] [<ffffffff810a830a>] ? perf_event_for_each_child+0x62/0x83
[ 140.248002] [<ffffffff810ab3da>] ? perf_event_task_disable+0x3f/0x6d
[ 140.248002] [<ffffffff8104184c>] ? SyS_prctl+0x16a/0x32f
[ 140.248002] [<ffffffff8136a452>] ? system_call_fastpath+0x16/0x1b
[ 140.248002] Code: 48 89 da 48 c7 c6 1a a8 0a 81 e8 cc e4 ff ff 85 c0 74 41 4

*/
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