======================================================== WARNING: possible irq lock inversion dependency detected 5.18.0-syzkaller #0 Not tainted -------------------------------------------------------- udevd/3958 just changed the state of lock: ffff888022813148 (&timer->lock){..-.}-{2:2}, at: snd_timer_interrupt.part.0+0x28/0xd50 sound/core/timer.c:856 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: &timer->lock --> &new->fa_lock --> tasklist_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tasklist_lock); local_irq_disable(); lock(&timer->lock); lock(&new->fa_lock); lock(&timer->lock); *** DEADLOCK *** 1 lock held by udevd/3958: #0: ffffc90000007d78 ((&priv->tlist)){+.-.}-{0:0}, at: lockdep_copy_map include/linux/lockdep.h:35 [inline] #0: ffffc90000007d78 ((&priv->tlist)){+.-.}-{0:0}, at: call_timer_fn+0xcd/0x4a0 kernel/time/timer.c:1464 the shortest dependencies between 2nd lock and 1st lock: -> (tasklist_lock){.+.+}-{2:2} { HARDIRQ-ON-R at: lock_acquire kernel/locking/lockdep.c:5634 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5599 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228 do_wait+0x231/0xaa0 kernel/exit.c:1508 kernel_wait+0x97/0x130 kernel/exit.c:1698 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xbb/0x140 kernel/umh.c:166 process_one_work+0x865/0x13d0 kernel/workqueue.c:2289 worker_thread+0x598/0xec0 kernel/workqueue.c:2436 kthread+0x299/0x340 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 SOFTIRQ-ON-R at: lock_acquire kernel/locking/lockdep.c:5634 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5599 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228 do_wait+0x231/0xaa0 kernel/exit.c:1508 kernel_wait+0x97/0x130 kernel/exit.c:1698 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xbb/0x140 kernel/umh.c:166 process_one_work+0x865/0x13d0 kernel/workqueue.c:2289 worker_thread+0x598/0xec0 kernel/workqueue.c:2436 kthread+0x299/0x340 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5634 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5599 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:326 copy_process+0x3a22/0x68e0 kernel/fork.c:2373 kernel_clone+0xb8/0x7f0 kernel/fork.c:2644 kernel_thread+0xa3/0xe0 kernel/fork.c:2696 rest_init+0x1e/0x200 init/main.c:691 arch_call_rest_init+0xa/0xb init/main.c:882 start_kernel+0x332/0x350 init/main.c:1137 secondary_startup_64_no_verify+0xce/0xdb INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5634 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5599 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228 do_wait+0x231/0xaa0 kernel/exit.c:1508 kernel_wait+0x97/0x130 kernel/exit.c:1698 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xbb/0x140 kernel/umh.c:166 process_one_work+0x865/0x13d0 kernel/workqueue.c:2289 worker_thread+0x598/0xec0 kernel/workqueue.c:2436 kthread+0x299/0x340 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 } ... key at: [] tasklist_lock+0x18/0x40 ... acquired at: __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228 send_sigio+0x8c/0x2b0 fs/fcntl.c:792 kill_fasync_rcu fs/fcntl.c:1003 [inline] kill_fasync fs/fcntl.c:1017 [inline] kill_fasync+0x176/0x320 fs/fcntl.c:1010 snd_timer_user_ccallback+0x24d/0x300 sound/core/timer.c:1386 snd_timer_notify1+0x115/0x330 sound/core/timer.c:516 snd_timer_stop1+0x3bd/0x7b0 sound/core/timer.c:657 snd_timer_stop sound/core/timer.c:710 [inline] snd_timer_close_locked+0x1cc/0xb30 sound/core/timer.c:408 snd_timer_close+0x7d/0xd0 sound/core/timer.c:463 __snd_timer_user_ioctl.isra.0+0xaf5/0x1e90 sound/core/timer.c:1762 snd_timer_user_ioctl+0x72/0xa0 sound/core/timer.c:2128 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 -> (&f->f_owner.lock){....}-{2:2} { INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5634 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5599 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:326 f_modown+0x23/0x320 fs/fcntl.c:91 __f_setown fs/fcntl.c:110 [inline] f_setown+0x86/0x160 fs/fcntl.c:138 do_fcntl+0x52a/0xd00 fs/fcntl.c:377 __do_sys_fcntl fs/fcntl.c:454 [inline] __se_sys_fcntl fs/fcntl.c:439 [inline] __x64_sys_fcntl+0x114/0x160 fs/fcntl.c:439 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5634 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5599 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236 send_sigio+0x1c/0x2b0 fs/fcntl.c:778 kill_fasync_rcu fs/fcntl.c:1003 [inline] kill_fasync fs/fcntl.c:1017 [inline] kill_fasync+0x176/0x320 fs/fcntl.c:1010 snd_timer_user_ccallback+0x24d/0x300 sound/core/timer.c:1386 snd_timer_notify1+0x115/0x330 sound/core/timer.c:516 snd_timer_start1+0x3dd/0x6f0 sound/core/timer.c:578 snd_timer_start sound/core/timer.c:696 [inline] snd_timer_start sound/core/timer.c:689 [inline] snd_timer_user_start.isra.0+0x16d/0x1e0 sound/core/timer.c:1984 __snd_timer_user_ioctl.isra.0+0xa9d/0x1e90 sound/core/timer.c:2107 snd_timer_user_ioctl+0x72/0xa0 sound/core/timer.c:2128 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 } ... key at: [] __key.5+0x0/0x40 ... acquired at: __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236 send_sigio+0x1c/0x2b0 fs/fcntl.c:778 kill_fasync_rcu fs/fcntl.c:1003 [inline] kill_fasync fs/fcntl.c:1017 [inline] kill_fasync+0x176/0x320 fs/fcntl.c:1010 snd_timer_user_ccallback+0x24d/0x300 sound/core/timer.c:1386 snd_timer_notify1+0x115/0x330 sound/core/timer.c:516 snd_timer_start1+0x3dd/0x6f0 sound/core/timer.c:578 snd_timer_start sound/core/timer.c:696 [inline] snd_timer_start sound/core/timer.c:689 [inline] snd_timer_user_start.isra.0+0x16d/0x1e0 sound/core/timer.c:1984 __snd_timer_user_ioctl.isra.0+0xa9d/0x1e90 sound/core/timer.c:2107 snd_timer_user_ioctl+0x72/0xa0 sound/core/timer.c:2128 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 -> (&new->fa_lock){....}-{2:2} { INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5634 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5599 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:326 fasync_remove_entry+0xa1/0x1d0 fs/fcntl.c:873 __fput+0x664/0x8c0 fs/file_table.c:314 task_work_run+0xc0/0x160 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0x80 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5634 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5599 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:996 [inline] kill_fasync fs/fcntl.c:1017 [inline] kill_fasync+0xe5/0x320 fs/fcntl.c:1010 snd_timer_user_ccallback+0x24d/0x300 sound/core/timer.c:1386 snd_timer_notify1+0x115/0x330 sound/core/timer.c:516 snd_timer_start1+0x3dd/0x6f0 sound/core/timer.c:578 snd_timer_start sound/core/timer.c:696 [inline] snd_timer_start sound/core/timer.c:689 [inline] snd_timer_user_start.isra.0+0x16d/0x1e0 sound/core/timer.c:1984 __snd_timer_user_ioctl.isra.0+0xa9d/0x1e90 sound/core/timer.c:2107 snd_timer_user_ioctl+0x72/0xa0 sound/core/timer.c:2128 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 } ... key at: [] __key.0+0x0/0x40 ... acquired at: __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:996 [inline] kill_fasync fs/fcntl.c:1017 [inline] kill_fasync+0xe5/0x320 fs/fcntl.c:1010 snd_timer_user_ccallback+0x24d/0x300 sound/core/timer.c:1386 snd_timer_notify1+0x115/0x330 sound/core/timer.c:516 snd_timer_start1+0x3dd/0x6f0 sound/core/timer.c:578 snd_timer_start sound/core/timer.c:696 [inline] snd_timer_start sound/core/timer.c:689 [inline] snd_timer_user_start.isra.0+0x16d/0x1e0 sound/core/timer.c:1984 __snd_timer_user_ioctl.isra.0+0xa9d/0x1e90 sound/core/timer.c:2107 snd_timer_user_ioctl+0x72/0xa0 sound/core/timer.c:2128 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 -> (&timer->lock){..-.}-{2:2} { IN-SOFTIRQ-W at: lock_acquire kernel/locking/lockdep.c:5634 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5599 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 snd_timer_interrupt.part.0+0x28/0xd50 sound/core/timer.c:856 call_timer_fn+0x163/0x4a0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers.part.0+0x530/0x8e0 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0x9c/0x190 kernel/time/timer.c:1803 __do_softirq+0x29b/0x9c2 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649 debug_rcu_head_queue kernel/rcu/rcu.h:177 [inline] call_rcu+0x2e/0x790 kernel/rcu/tree.c:3111 task_work_run+0xc0/0x160 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0x80 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5634 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5599 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 snd_timer_notify sound/core/timer.c:1086 [inline] snd_timer_notify+0xcc/0x320 sound/core/timer.c:1073 snd_pcm_timer_notify sound/core/pcm_native.c:608 [inline] snd_pcm_post_stop+0x173/0x1d0 sound/core/pcm_native.c:1512 snd_pcm_action_single+0xbe/0xf0 sound/core/pcm_native.c:1283 snd_pcm_stop sound/core/pcm_native.c:1535 [inline] snd_pcm_drop+0x165/0x290 sound/core/pcm_native.c:2218 snd_pcm_oss_sync+0x1ed/0x730 sound/core/oss/pcm_oss.c:1746 snd_pcm_oss_release+0x21f/0x2b0 sound/core/oss/pcm_oss.c:2590 __fput+0x1f5/0x8c0 fs/file_table.c:317 task_work_run+0xc0/0x160 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0x80 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 } ... key at: [] __key.10+0x0/0x40 ... acquired at: mark_lock kernel/locking/lockdep.c:4565 [inline] mark_usage kernel/locking/lockdep.c:4496 [inline] __lock_acquire+0x11de/0x5660 kernel/locking/lockdep.c:4976 lock_acquire kernel/locking/lockdep.c:5634 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5599 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 snd_timer_interrupt.part.0+0x28/0xd50 sound/core/timer.c:856 call_timer_fn+0x163/0x4a0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers.part.0+0x530/0x8e0 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0x9c/0x190 kernel/time/timer.c:1803 __do_softirq+0x29b/0x9c2 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649 debug_rcu_head_queue kernel/rcu/rcu.h:177 [inline] call_rcu+0x2e/0x790 kernel/rcu/tree.c:3111 task_work_run+0xc0/0x160 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0x80 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 stack backtrace: CPU: 0 PID: 3958 Comm: udevd Not tainted 5.18.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106 print_irq_inversion_bug kernel/locking/lockdep.c:4603 [inline] check_usage_forwards kernel/locking/lockdep.c:4040 [inline] mark_lock_irq kernel/locking/lockdep.c:4172 [inline] mark_lock.part.0.cold+0x82/0xd8 kernel/locking/lockdep.c:4601 mark_lock kernel/locking/lockdep.c:4565 [inline] mark_usage kernel/locking/lockdep.c:4496 [inline] __lock_acquire+0x11de/0x5660 kernel/locking/lockdep.c:4976 lock_acquire kernel/locking/lockdep.c:5634 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5599 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 snd_timer_interrupt.part.0+0x28/0xd50 sound/core/timer.c:856 call_timer_fn+0x163/0x4a0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers.part.0+0x530/0x8e0 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0x9c/0x190 kernel/time/timer.c:1803 __do_softirq+0x29b/0x9c2 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:debug_rcu_head_queue kernel/rcu/rcu.h:177 [inline] RIP: 0010:call_rcu+0x2e/0x790 kernel/rcu/tree.c:3111 Code: 41 55 41 54 49 89 f4 55 53 48 89 fb 48 83 ec 18 83 e7 07 0f 85 2d 04 00 00 48 c7 c6 00 1a ed 88 48 89 df e8 04 4a 41 02 31 d2 01 00 00 00 48 89 df 89 c5 48 c7 c6 00 1a ed 88 e8 1c 33 41 02 RSP: 0018:ffffc90002a5fe78 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff88801a584500 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff88eba8c0 RDI: 0000000000000001 RBP: ffff88801f002628 R08: 0000000000000001 R09: 0000000000000001 R10: fffffbfff1f248cb R11: 0000000000000001 R12: ffffffff81ba8930 R13: ffff88801f001d40 R14: 0000000000000000 R15: ffff88801a584500 task_work_run+0xc0/0x160 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0x80 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f23b3da5fc3 Code: 48 ff ff ff b8 ff ff ff ff e9 3e ff ff ff 66 0f 1f 84 00 00 00 00 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 RSP: 002b:00007ffdaaedada8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 000055b0599e3760 RCX: 00007f23b3da5fc3 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000b RBP: 000055b0599e3760 R08: 0000000000000007 R09: 000055b0599bd120 R10: 0000000000000000 R11: 0000000000000246 R12: 000055b0599e3760 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 41 55 push %r13 2: 41 54 push %r12 4: 49 89 f4 mov %rsi,%r12 7: 55 push %rbp 8: 53 push %rbx 9: 48 89 fb mov %rdi,%rbx c: 48 83 ec 18 sub $0x18,%rsp 10: 83 e7 07 and $0x7,%edi 13: 0f 85 2d 04 00 00 jne 0x446 19: 48 c7 c6 00 1a ed 88 mov $0xffffffff88ed1a00,%rsi 20: 48 89 df mov %rbx,%rdi 23: e8 04 4a 41 02 callq 0x2414a2c 28: 31 d2 xor %edx,%edx * 2a: b9 01 00 00 00 mov $0x1,%ecx <-- trapping instruction 2f: 48 89 df mov %rbx,%rdi 32: 89 c5 mov %eax,%ebp 34: 48 c7 c6 00 1a ed 88 mov $0xffffffff88ed1a00,%rsi 3b: e8 1c 33 41 02 callq 0x241335c