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Message-ID: <000000000000291c7005dd59d53d@google.com>
Date: Sat, 23 Apr 2022 15:26:21 -0700
From: syzbot <syzbot+669c9abf11a6a011dd09@...kaller.appspotmail.com>
To: alsa-devel@...a-project.org, bfields@...ldses.org,
broonie@...nel.org, jlayton@...nel.org,
kai.vehmanen@...ux.intel.com, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, o-takashi@...amocchi.jp,
perex@...ex.cz, pierre-louis.bossart@...ux.intel.com,
ranjani.sridharan@...ux.intel.com, syzkaller-bugs@...glegroups.com,
tiwai@...e.com, viro@...iv.linux.org.uk
Subject: Re: [syzbot] possible deadlock in snd_pcm_period_elapsed (3)
syzbot has found a reproducer for the following issue on:
HEAD commit: 45ab9400e73f Merge tag 'perf-tools-fixes-for-v5.18-2022-04..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17e13008f00000
kernel config: https://syzkaller.appspot.com/x/.config?x=d1843173f299d1e8
dashboard link: https://syzkaller.appspot.com/bug?extid=669c9abf11a6a011dd09
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=154827d0f00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16e5002cf00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+669c9abf11a6a011dd09@...kaller.appspotmail.com
========================================================
WARNING: possible irq lock inversion dependency detected
5.18.0-rc3-syzkaller-00196-g45ab9400e73f #0 Not tainted
--------------------------------------------------------
swapper/0/0 just changed the state of lock:
ffff888023b16110 (&group->lock){..-.}-{2:2}, at: snd_pcm_period_elapsed+0x2c/0x210 sound/core/pcm_lib.c:1848
but this lock took another, SOFTIRQ-READ-unsafe lock in the past:
(tasklist_lock){.+.+}-{2:2}
and interrupts could create inverse lock ordering between them.
other info that might help us debug this:
Chain exists of:
&group->lock --> &timer->lock --> tasklist_lock
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(tasklist_lock);
local_irq_disable();
lock(&group->lock);
lock(&timer->lock);
<Interrupt>
lock(&group->lock);
*** DEADLOCK ***
no locks held by swapper/0/0.
the shortest dependencies between 2nd lock and 1st lock:
-> (tasklist_lock){.+.+}-{2:2} {
HARDIRQ-ON-R at:
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
do_wait+0x224/0x9d0 kernel/exit.c:1508
kernel_wait+0xe4/0x230 kernel/exit.c:1698
call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166
process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30
SOFTIRQ-ON-R at:
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
do_wait+0x224/0x9d0 kernel/exit.c:1508
kernel_wait+0xe4/0x230 kernel/exit.c:1698
call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166
process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30
INITIAL USE at:
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:326
copy_process+0x234d/0x3f70 kernel/fork.c:2368
kernel_clone+0x22f/0x7a0 kernel/fork.c:2639
kernel_thread+0x167/0x1e0 kernel/fork.c:2691
rest_init+0x21/0x2e0 init/main.c:691
start_kernel+0x4bf/0x56e init/main.c:1140
secondary_startup_64_no_verify+0xc4/0xcb
INITIAL READ USE at:
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
do_wait+0x224/0x9d0 kernel/exit.c:1508
kernel_wait+0xe4/0x230 kernel/exit.c:1698
call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166
process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30
}
... key at: [<ffffffff8c80a058>] tasklist_lock+0x18/0x40
... acquired at:
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
send_sigio+0xbe/0x300 fs/fcntl.c:792
dnotify_handle_event+0x136/0x450 fs/notify/dnotify/dnotify.c:115
fsnotify+0xc84/0x1270 fs/notify/fsnotify.c:564
fsnotify_name include/linux/fsnotify.h:36 [inline]
fsnotify_dirent include/linux/fsnotify.h:42 [inline]
fsnotify_create include/linux/fsnotify.h:207 [inline]
open_last_lookups fs/namei.c:3402 [inline]
path_openat+0x14b3/0x2ec0 fs/namei.c:3606
do_filp_open+0x277/0x4f0 fs/namei.c:3636
do_sys_openat2+0x13b/0x500 fs/open.c:1213
do_sys_open fs/open.c:1229 [inline]
__do_sys_creat fs/open.c:1305 [inline]
__se_sys_creat fs/open.c:1299 [inline]
__x64_sys_creat+0x11f/0x160 fs/open.c:1299
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> (&f->f_owner.lock){....}-{2:2} {
INITIAL USE at:
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:326
f_modown+0x38/0x340 fs/fcntl.c:91
__f_setown fs/fcntl.c:110 [inline]
f_setown+0x113/0x1a0 fs/fcntl.c:138
do_fcntl+0x128/0x13b0 fs/fcntl.c:377
__do_sys_fcntl fs/fcntl.c:454 [inline]
__se_sys_fcntl+0xd5/0x1b0 fs/fcntl.c:439
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
INITIAL READ USE at:
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
send_sigio+0x2f/0x300 fs/fcntl.c:778
kill_fasync_rcu fs/fcntl.c:1003 [inline]
kill_fasync+0x1e4/0x430 fs/fcntl.c:1017
snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1386
snd_timer_notify1+0x1ad/0x350 sound/core/timer.c:516
snd_timer_start1+0x53d/0x640 sound/core/timer.c:578
snd_timer_start sound/core/timer.c:696 [inline]
snd_timer_user_start sound/core/timer.c:1984 [inline]
__snd_timer_user_ioctl+0xae7/0x54c0 sound/core/timer.c:2107
snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2128
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
}
... key at: [<ffffffff90c42cc0>] __alloc_file.__key+0x0/0x10
... acquired at:
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
send_sigio+0x2f/0x300 fs/fcntl.c:778
kill_fasync_rcu fs/fcntl.c:1003 [inline]
kill_fasync+0x1e4/0x430 fs/fcntl.c:1017
snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1386
snd_timer_notify1+0x1ad/0x350 sound/core/timer.c:516
snd_timer_start1+0x53d/0x640 sound/core/timer.c:578
snd_timer_start sound/core/timer.c:696 [inline]
snd_timer_user_start sound/core/timer.c:1984 [inline]
__snd_timer_user_ioctl+0xae7/0x54c0 sound/core/timer.c:2107
snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2128
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> (&new->fa_lock){....}-{2:2} {
INITIAL READ USE at:
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:996 [inline]
kill_fasync+0x13b/0x430 fs/fcntl.c:1017
snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1386
snd_timer_notify1+0x1ad/0x350 sound/core/timer.c:516
snd_timer_start1+0x53d/0x640 sound/core/timer.c:578
snd_timer_start sound/core/timer.c:696 [inline]
snd_timer_user_start sound/core/timer.c:1984 [inline]
__snd_timer_user_ioctl+0xae7/0x54c0 sound/core/timer.c:2107
snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2128
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
}
... key at: [<ffffffff90c43940>] fasync_insert_entry.__key+0x0/0x20
... acquired at:
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:996 [inline]
kill_fasync+0x13b/0x430 fs/fcntl.c:1017
snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1386
snd_timer_notify1+0x1ad/0x350 sound/core/timer.c:516
snd_timer_start1+0x53d/0x640 sound/core/timer.c:578
snd_timer_start sound/core/timer.c:696 [inline]
snd_timer_user_start sound/core/timer.c:1984 [inline]
__snd_timer_user_ioctl+0xae7/0x54c0 sound/core/timer.c:2107
snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2128
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> (&timer->lock){....}-{2:2} {
INITIAL USE at:
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
snd_timer_resolution sound/core/timer.c:489 [inline]
snd_timer_user_params sound/core/timer.c:1851 [inline]
__snd_timer_user_ioctl+0x1a3f/0x54c0 sound/core/timer.c:2100
snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2128
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
}
... key at: [<ffffffff90f96160>] snd_timer_new.__key+0x0/0x20
... acquired at:
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
snd_timer_notify+0x105/0x3e0 sound/core/timer.c:1086
snd_pcm_action sound/core/pcm_native.c:1364 [inline]
snd_pcm_start+0x383/0x400 sound/core/pcm_native.c:1470
__snd_pcm_lib_xfer+0x13e0/0x18a0 sound/core/pcm_lib.c:2308
snd_pcm_oss_write3+0x202/0x390 sound/core/oss/pcm_oss.c:1253
snd_pcm_oss_write2 sound/core/oss/pcm_oss.c:1393 [inline]
snd_pcm_oss_sync1+0x3a6/0x7f0 sound/core/oss/pcm_oss.c:1627
snd_pcm_oss_sync+0x9cf/0xf00 sound/core/oss/pcm_oss.c:1693
snd_pcm_oss_release+0x119/0x270 sound/core/oss/pcm_oss.c:2590
__fput+0x3b9/0x820 fs/file_table.c:317
task_work_run+0x146/0x1c0 kernel/task_work.c:164
exit_task_work include/linux/task_work.h:37 [inline]
do_exit+0x547/0x1eb0 kernel/exit.c:795
do_group_exit+0x23b/0x2f0 kernel/exit.c:925
__do_sys_exit_group kernel/exit.c:936 [inline]
__se_sys_exit_group kernel/exit.c:934 [inline]
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:934
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> (&group->lock){..-.}-{2:2} {
IN-SOFTIRQ-W at:
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
snd_pcm_period_elapsed+0x2c/0x210 sound/core/pcm_lib.c:1848
dummy_hrtimer_callback+0x87/0x190 sound/drivers/dummy.c:377
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x1a1/0x580 kernel/time/hrtimer.c:1766
__do_softirq+0x382/0x793 kernel/softirq.c:558
__irq_exit_rcu+0xec/0x170 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20
native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
acpi_safe_halt drivers/acpi/processor_idle.c:115 [inline]
acpi_idle_do_entry drivers/acpi/processor_idle.c:556 [inline]
acpi_idle_enter+0x42d/0x790 drivers/acpi/processor_idle.c:691
cpuidle_enter_state+0x517/0xed0 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x59/0x90 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:236 [inline]
do_idle+0x3d2/0x640 kernel/sched/idle.c:303
cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:400
start_kernel+0x4bf/0x56e init/main.c:1140
secondary_startup_64_no_verify+0xc4/0xcb
INITIAL USE at:
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:374 [inline]
snd_pcm_group_lock_irq sound/core/pcm_native.c:97 [inline]
snd_pcm_stream_lock_irq sound/core/pcm_native.c:136 [inline]
snd_pcm_hw_params+0x164/0x1860 sound/core/pcm_native.c:726
snd_pcm_oss_change_params_locked+0x1f21/0x3c80 sound/core/oss/pcm_oss.c:976
snd_pcm_oss_make_ready_locked sound/core/oss/pcm_oss.c:1198 [inline]
snd_pcm_oss_write1+0x249/0x1130 sound/core/oss/pcm_oss.c:1416
vfs_write+0x303/0xd40 fs/read_write.c:589
ksys_write+0x19b/0x2c0 fs/read_write.c:644
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
}
... key at: [<ffffffff90f96980>] snd_pcm_group_init.__key+0x0/0x20
... acquired at:
mark_lock+0x21c/0x350 kernel/locking/lockdep.c:4607
__lock_acquire+0xb81/0x1f80 kernel/locking/lockdep.c:4983
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
snd_pcm_period_elapsed+0x2c/0x210 sound/core/pcm_lib.c:1848
dummy_hrtimer_callback+0x87/0x190 sound/drivers/dummy.c:377
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x1a1/0x580 kernel/time/hrtimer.c:1766
__do_softirq+0x382/0x793 kernel/softirq.c:558
__irq_exit_rcu+0xec/0x170 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20
native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
acpi_safe_halt drivers/acpi/processor_idle.c:115 [inline]
acpi_idle_do_entry drivers/acpi/processor_idle.c:556 [inline]
acpi_idle_enter+0x42d/0x790 drivers/acpi/processor_idle.c:691
cpuidle_enter_state+0x517/0xed0 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x59/0x90 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:236 [inline]
do_idle+0x3d2/0x640 kernel/sched/idle.c:303
cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:400
start_kernel+0x4bf/0x56e init/main.c:1140
secondary_startup_64_no_verify+0xc4/0xcb
stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.18.0-rc3-syzkaller-00196-g45ab9400e73f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_irq_inversion_bug+0x58c/0x6f0 kernel/locking/lockdep.c:4014
mark_lock_irq+0x9d2/0xf00 kernel/locking/lockdep.c:4177
mark_lock+0x21c/0x350 kernel/locking/lockdep.c:4607
__lock_acquire+0xb81/0x1f80 kernel/locking/lockdep.c:4983
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5641
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
snd_pcm_period_elapsed+0x2c/0x210 sound/core/pcm_lib.c:1848
dummy_hrtimer_callback+0x87/0x190 sound/drivers/dummy.c:377
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x1a1/0x580 kernel/time/hrtimer.c:1766
__do_softirq+0x382/0x793 kernel/softirq.c:558
__irq_exit_rcu+0xec/0x170 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:22 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:116 [inline]
RIP: 0010:acpi_idle_do_entry drivers/acpi/processor_idle.c:556 [inline]
RIP: 0010:acpi_idle_enter+0x42d/0x790 drivers/acpi/processor_idle.c:691
Code: fc 48 83 e3 08 44 8b 7c 24 04 0f 85 22 01 00 00 4c 8d 74 24 40 e8 93 fd 00 fd eb 0c e8 ac 59 fa fc 0f 00 2d f5 a1 68 06 fb f4 <4c> 89 f3 48 c1 eb 03 42 80 3c 23 00 74 08 4c 89 f7 e8 5d 3f 4b fd
RSP: 0018:ffffffff8c807bc0 EFLAGS: 00000282
RAX: ea48baa34ad6ff00 RBX: 0000000000000000 RCX: ffffffff90b7a603
RDX: dffffc0000000000 RSI: ffffffff8a8d0480 RDI: ffffffff8ae88c20
RBP: ffffffff8c807c70 R08: ffffffff818ca320 R09: fffffbfff19176c9
R10: fffffbfff19176c9 R11: 1ffffffff19176c8 R12: dffffc0000000000
R13: ffff888016bdf064 R14: ffffffff8c807c00 R15: 0000000000000001
cpuidle_enter_state+0x517/0xed0 drivers/cpuidle/cpuidle.c:237
----------------
Code disassembly (best guess):
0: fc cld
1: 48 83 e3 08 and $0x8,%rbx
5: 44 8b 7c 24 04 mov 0x4(%rsp),%r15d
a: 0f 85 22 01 00 00 jne 0x132
10: 4c 8d 74 24 40 lea 0x40(%rsp),%r14
15: e8 93 fd 00 fd callq 0xfd00fdad
1a: eb 0c jmp 0x28
1c: e8 ac 59 fa fc callq 0xfcfa59cd
21: 0f 00 2d f5 a1 68 06 verw 0x668a1f5(%rip) # 0x668a21d
28: fb sti
29: f4 hlt
* 2a: 4c 89 f3 mov %r14,%rbx <-- trapping instruction
2d: 48 c1 eb 03 shr $0x3,%rbx
31: 42 80 3c 23 00 cmpb $0x0,(%rbx,%r12,1)
36: 74 08 je 0x40
38: 4c 89 f7 mov %r14,%rdi
3b: e8 5d 3f 4b fd callq 0xfd4b3f9d
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