======================================================== WARNING: possible irq lock inversion dependency detected 5.19.0-rc5-syzkaller-00105-g9f09069cde34 #0 Not tainted -------------------------------------------------------- syz-executor.0/3644 just changed the state of lock: ffff888025578110 (&group->lock){..-.}-{2:2}, at: _snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170 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); lock(&group->lock); *** DEADLOCK *** no locks held by syz-executor.0/3644. the shortest dependencies between 2nd lock and 1st lock: -> (tasklist_lock){.+.+}-{2:2} { HARDIRQ-ON-R at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228 do_wait+0x284/0xce0 kernel/exit.c:1508 kernel_wait+0x9c/0x150 kernel/exit.c:1698 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 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:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228 do_wait+0x284/0xce0 kernel/exit.c:1508 kernel_wait+0x9c/0x150 kernel/exit.c:1698 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 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:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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+0x445e/0x7020 kernel/fork.c:2374 kernel_clone+0xe7/0xab0 kernel/fork.c:2655 user_mode_thread+0xad/0xe0 kernel/fork.c:2724 rest_init+0x23/0x270 init/main.c:691 arch_call_rest_init+0xf/0x14 init/main.c:882 start_kernel+0x46e/0x48f init/main.c:1137 secondary_startup_64_no_verify+0xce/0xdb INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228 do_wait+0x284/0xce0 kernel/exit.c:1508 kernel_wait+0x9c/0x150 kernel/exit.c:1698 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 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+0xab/0x380 fs/fcntl.c:791 dnotify_handle_event+0x148/0x280 fs/notify/dnotify/dnotify.c:115 fsnotify_handle_inode_event.isra.0+0x22e/0x370 fs/notify/fsnotify.c:264 fsnotify_handle_event fs/notify/fsnotify.c:316 [inline] send_to_group fs/notify/fsnotify.c:362 [inline] fsnotify+0xec5/0x13a0 fs/notify/fsnotify.c:567 fsnotify_parent include/linux/fsnotify.h:80 [inline] fsnotify_file include/linux/fsnotify.h:99 [inline] fsnotify_access include/linux/fsnotify.h:309 [inline] iterate_dir+0x5e2/0x6f0 fs/readdir.c:69 __do_sys_getdents fs/readdir.c:286 [inline] __se_sys_getdents fs/readdir.c:271 [inline] __x64_sys_getdents+0x13a/0x2b0 fs/readdir.c:271 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 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:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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+0x2a/0x390 fs/fcntl.c:90 fcntl_dirnotify+0x9f3/0xf30 fs/notify/dnotify/dnotify.c:369 do_fcntl+0x24c/0x1040 fs/fcntl.c:405 __do_sys_fcntl fs/fcntl.c:453 [inline] __se_sys_fcntl fs/fcntl.c:438 [inline] __x64_sys_fcntl+0x15f/0x1d0 fs/fcntl.c:438 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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+0x24/0x380 fs/fcntl.c:777 kill_fasync_rcu fs/fcntl.c:1002 [inline] kill_fasync fs/fcntl.c:1016 [inline] kill_fasync+0x1f8/0x470 fs/fcntl.c:1009 snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386 snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516 snd_timer_start1+0x4d4/0x800 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+0x1e3/0x260 sound/core/timer.c:1984 __snd_timer_user_ioctl.isra.0+0xda4/0x2490 sound/core/timer.c:2107 snd_timer_user_ioctl+0x77/0xb0 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+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 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+0x24/0x380 fs/fcntl.c:777 kill_fasync_rcu fs/fcntl.c:1002 [inline] kill_fasync fs/fcntl.c:1016 [inline] kill_fasync+0x1f8/0x470 fs/fcntl.c:1009 snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386 snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516 snd_timer_start1+0x4d4/0x800 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+0x1e3/0x260 sound/core/timer.c:1984 __snd_timer_user_ioctl.isra.0+0xda4/0x2490 sound/core/timer.c:2107 snd_timer_user_ioctl+0x77/0xb0 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+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 -> (&new->fa_lock){....}-{2:2} { INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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:995 [inline] kill_fasync fs/fcntl.c:1016 [inline] kill_fasync+0x136/0x470 fs/fcntl.c:1009 snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386 snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516 snd_timer_start1+0x4d4/0x800 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+0x1e3/0x260 sound/core/timer.c:1984 __snd_timer_user_ioctl.isra.0+0xda4/0x2490 sound/core/timer.c:2107 snd_timer_user_ioctl+0x77/0xb0 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+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 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:995 [inline] kill_fasync fs/fcntl.c:1016 [inline] kill_fasync+0x136/0x470 fs/fcntl.c:1009 snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386 snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516 snd_timer_start1+0x4d4/0x800 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+0x1e3/0x260 sound/core/timer.c:1984 __snd_timer_user_ioctl.isra.0+0xda4/0x2490 sound/core/timer.c:2107 snd_timer_user_ioctl+0x77/0xb0 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+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 -> (&timer->lock){....}-{2:2} { INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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+0x10c/0x3d0 sound/core/timer.c:1073 snd_pcm_timer_notify sound/core/pcm_native.c:608 [inline] snd_pcm_post_start+0x24a/0x310 sound/core/pcm_native.c:1451 snd_pcm_action_single+0xf4/0x130 sound/core/pcm_native.c:1283 snd_pcm_action+0x6e/0x90 sound/core/pcm_native.c:1364 __snd_pcm_lib_xfer+0x14d0/0x1e10 sound/core/pcm_lib.c:2308 snd_pcm_oss_write3+0x103/0x250 sound/core/oss/pcm_oss.c:1253 io_playback_transfer+0x27e/0x330 sound/core/oss/io.c:47 snd_pcm_plug_write_transfer+0x2cd/0x3f0 sound/core/oss/pcm_plugin.c:630 snd_pcm_oss_write2+0x245/0x3f0 sound/core/oss/pcm_oss.c:1385 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1451 [inline] snd_pcm_oss_write+0x759/0x9c0 sound/core/oss/pcm_oss.c:2811 vfs_write+0x269/0xac0 fs/read_write.c:589 ksys_write+0x127/0x250 fs/read_write.c:644 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 } ... key at: [] __key.10+0x0/0x40 ... acquired at: __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+0x10c/0x3d0 sound/core/timer.c:1073 snd_pcm_timer_notify sound/core/pcm_native.c:608 [inline] snd_pcm_post_start+0x24a/0x310 sound/core/pcm_native.c:1451 snd_pcm_action_single+0xf4/0x130 sound/core/pcm_native.c:1283 snd_pcm_action+0x6e/0x90 sound/core/pcm_native.c:1364 __snd_pcm_lib_xfer+0x14d0/0x1e10 sound/core/pcm_lib.c:2308 snd_pcm_oss_write3+0x103/0x250 sound/core/oss/pcm_oss.c:1253 io_playback_transfer+0x27e/0x330 sound/core/oss/io.c:47 snd_pcm_plug_write_transfer+0x2cd/0x3f0 sound/core/oss/pcm_plugin.c:630 snd_pcm_oss_write2+0x245/0x3f0 sound/core/oss/pcm_oss.c:1385 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1451 [inline] snd_pcm_oss_write+0x759/0x9c0 sound/core/oss/pcm_oss.c:2811 vfs_write+0x269/0xac0 fs/read_write.c:589 ksys_write+0x127/0x250 fs/read_write.c:644 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 -> (&group->lock){..-.}-{2:2} { IN-SOFTIRQ-W at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 _snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170 snd_pcm_period_elapsed+0x1d/0x50 sound/core/pcm_lib.c:1848 dummy_hrtimer_callback+0x94/0x1b0 sound/drivers/dummy.c:377 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766 __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 get_current arch/x86/include/asm/current.h:15 [inline] finish_task_switch.isra.0+0x2b9/0xbb0 kernel/sched/core.c:5026 context_switch kernel/sched/core.c:5149 [inline] __schedule+0xa08/0x4b50 kernel/sched/core.c:6458 schedule+0xd2/0x1f0 kernel/sched/core.c:6530 freezable_schedule include/linux/freezer.h:172 [inline] ptrace_stop.part.0+0x4d7/0xa80 kernel/signal.c:2307 ptrace_stop kernel/signal.c:2232 [inline] ptrace_do_notify+0x215/0x2b0 kernel/signal.c:2344 ptrace_notify+0xc4/0x140 kernel/signal.c:2356 ptrace_report_syscall include/linux/ptrace.h:420 [inline] ptrace_report_syscall_entry include/linux/ptrace.h:457 [inline] syscall_trace_enter.constprop.0+0xb0/0x240 kernel/entry/common.c:63 do_syscall_64+0x16/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x46/0xb0 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0x32/0x50 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+0x14b/0x19f0 sound/core/pcm_native.c:726 snd_pcm_kernel_ioctl+0x164/0x310 sound/core/pcm_native.c:3435 snd_pcm_oss_change_params_locked+0x14e2/0x3a70 sound/core/oss/pcm_oss.c:976 snd_pcm_oss_make_ready_locked+0xb3/0x130 sound/core/oss/pcm_oss.c:1198 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1416 [inline] snd_pcm_oss_write+0x4ac/0x9c0 sound/core/oss/pcm_oss.c:2811 vfs_write+0x269/0xac0 fs/read_write.c:589 ksys_write+0x127/0x250 fs/read_write.c:644 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 } ... key at: [] __key.8+0x0/0x40 ... acquired at: mark_lock kernel/locking/lockdep.c:4596 [inline] mark_usage kernel/locking/lockdep.c:4527 [inline] __lock_acquire+0x11e7/0x5660 kernel/locking/lockdep.c:5007 lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 _snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170 snd_pcm_period_elapsed+0x1d/0x50 sound/core/pcm_lib.c:1848 dummy_hrtimer_callback+0x94/0x1b0 sound/drivers/dummy.c:377 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766 __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 get_current arch/x86/include/asm/current.h:15 [inline] finish_task_switch.isra.0+0x2b9/0xbb0 kernel/sched/core.c:5026 context_switch kernel/sched/core.c:5149 [inline] __schedule+0xa08/0x4b50 kernel/sched/core.c:6458 schedule+0xd2/0x1f0 kernel/sched/core.c:6530 freezable_schedule include/linux/freezer.h:172 [inline] ptrace_stop.part.0+0x4d7/0xa80 kernel/signal.c:2307 ptrace_stop kernel/signal.c:2232 [inline] ptrace_do_notify+0x215/0x2b0 kernel/signal.c:2344 ptrace_notify+0xc4/0x140 kernel/signal.c:2356 ptrace_report_syscall include/linux/ptrace.h:420 [inline] ptrace_report_syscall_entry include/linux/ptrace.h:457 [inline] syscall_trace_enter.constprop.0+0xb0/0x240 kernel/entry/common.c:63 do_syscall_64+0x16/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x46/0xb0 stack backtrace: CPU: 0 PID: 3644 Comm: syz-executor.0 Not tainted 5.19.0-rc5-syzkaller-00105-g9f09069cde34 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_irq_inversion_bug kernel/locking/lockdep.c:222 [inline] check_usage_forwards kernel/locking/lockdep.c:4071 [inline] mark_lock_irq kernel/locking/lockdep.c:4203 [inline] mark_lock.part.0.cold+0x86/0xd8 kernel/locking/lockdep.c:4632 mark_lock kernel/locking/lockdep.c:4596 [inline] mark_usage kernel/locking/lockdep.c:4527 [inline] __lock_acquire+0x11e7/0x5660 kernel/locking/lockdep.c:5007 lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 _snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170 snd_pcm_period_elapsed+0x1d/0x50 sound/core/pcm_lib.c:1848 dummy_hrtimer_callback+0x94/0x1b0 sound/drivers/dummy.c:377 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766 __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:finish_task_switch.isra.0+0x2b9/0xbb0 kernel/sched/core.c:5026 Code: 8b 3b 4c 89 f7 48 c7 03 00 00 00 00 ff d2 4d 85 ff 75 bd 4c 89 f7 e8 66 f8 ff ff e8 61 60 2e 00 fb 65 48 8b 1c 25 80 6f 02 00 <48> 8d bb 80 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc9000331fc10 EFLAGS: 00000206 RAX: 0000000000004093 RBX: ffff888026331d80 RCX: 1ffffffff1b76db9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000331fc58 R08: 0000000000000001 R09: 0000000000000001 R10: ffffed10173473d8 R11: 0000000000000001 R12: ffff8880b9a3ac18 R13: ffffffff8babc940 R14: ffff8880b9a39ec0 R15: ffff8880b9a3a8f8 context_switch kernel/sched/core.c:5149 [inline] __schedule+0xa08/0x4b50 kernel/sched/core.c:6458 schedule+0xd2/0x1f0 kernel/sched/core.c:6530 freezable_schedule include/linux/freezer.h:172 [inline] ptrace_stop.part.0+0x4d7/0xa80 kernel/signal.c:2307 ptrace_stop kernel/signal.c:2232 [inline] ptrace_do_notify+0x215/0x2b0 kernel/signal.c:2344 ptrace_notify+0xc4/0x140 kernel/signal.c:2356 ptrace_report_syscall include/linux/ptrace.h:420 [inline] ptrace_report_syscall_entry include/linux/ptrace.h:457 [inline] syscall_trace_enter.constprop.0+0xb0/0x240 kernel/entry/common.c:63 do_syscall_64+0x16/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f06840ade31 Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 aa e7 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 e3 e7 ff ff 48 8b 04 24 eb 97 66 2e 0f 1f RSP: 002b:00007fff049662c0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6 RAX: ffffffffffffffda RBX: 00007f068419bf60 RCX: 00007f06840ade31 RDX: 00007fff04966300 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f068419d960 R08: 0000000000000000 R09: 00007fff049f0080 R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000d641 R13: 00007fff04966410 R14: 00007f068419c030 R15: 0000000000000032 ---------------- Code disassembly (best guess): 0: 8b 3b mov (%rbx),%edi 2: 4c 89 f7 mov %r14,%rdi 5: 48 c7 03 00 00 00 00 movq $0x0,(%rbx) c: ff d2 callq *%rdx e: 4d 85 ff test %r15,%r15 11: 75 bd jne 0xffffffd0 13: 4c 89 f7 mov %r14,%rdi 16: e8 66 f8 ff ff callq 0xfffff881 1b: e8 61 60 2e 00 callq 0x2e6081 20: fb sti 21: 65 48 8b 1c 25 80 6f mov %gs:0x26f80,%rbx 28: 02 00 * 2a: 48 8d bb 80 15 00 00 lea 0x1580(%rbx),%rdi <-- trapping instruction 31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 38: fc ff df 3b: 48 89 fa mov %rdi,%rdx 3e: 48 rex.W 3f: c1 .byte 0xc1