Warning: Permanently added '10.128.0.120' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 524.765702][ C1] [ 524.768130][ C1] ======================================================== [ 524.775315][ C1] WARNING: possible irq lock inversion dependency detected [ 524.782512][ C1] 5.9.0-rc4-next-20200911-syzkaller #0 Not tainted [ 524.789019][ C1] -------------------------------------------------------- [ 524.796217][ C1] swapper/1/0 just changed the state of lock: [ 524.802263][ C1] ffff888099dbf908 (&group->lock){..-.}-{2:2}, at: _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 524.812277][ C1] but this lock took another, SOFTIRQ-READ-unsafe lock in the past: [ 524.820233][ C1] (&card->ctl_files_rwlock){.+.+}-{2:2} [ 524.820245][ C1] [ 524.820245][ C1] [ 524.820245][ C1] and interrupts could create inverse lock ordering between them. [ 524.820245][ C1] [ 524.840143][ C1] [ 524.840143][ C1] other info that might help us debug this: [ 524.848188][ C1] Possible interrupt unsafe locking scenario: [ 524.848188][ C1] [ 524.856479][ C1] CPU0 CPU1 [ 524.861816][ C1] ---- ---- [ 524.867151][ C1] lock(&card->ctl_files_rwlock); [ 524.872238][ C1] local_irq_disable(); [ 524.878981][ C1] lock(&group->lock); [ 524.885636][ C1] lock(&card->ctl_files_rwlock); [ 524.893239][ C1] [ 524.896667][ C1] lock(&group->lock); [ 524.900983][ C1] [ 524.900983][ C1] *** DEADLOCK *** [ 524.900983][ C1] [ 524.909116][ C1] 1 lock held by swapper/1/0: [ 524.913786][ C1] #0: ffffc90000da8d80 ((&dpcm->timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x6b0 [ 524.923139][ C1] [ 524.923139][ C1] the shortest dependencies between 2nd lock and 1st lock: [ 524.932488][ C1] -> (&card->ctl_files_rwlock){.+.+}-{2:2} { [ 524.938536][ C1] HARDIRQ-ON-R at: [ 524.942620][ C1] lock_acquire+0x1f2/0xaa0 [ 524.948985][ C1] _raw_read_lock+0x5b/0x70 [ 524.955338][ C1] snd_ctl_notify.part.0+0x36/0x550 [ 524.962349][ C1] snd_ctl_notify+0x8f/0xb0 [ 524.968684][ C1] __snd_ctl_add_replace+0x638/0x800 [ 524.975780][ C1] snd_ctl_add_replace+0x76/0x130 [ 524.982680][ C1] snd_dummy_probe+0xbbf/0x1050 [ 524.989445][ C1] platform_drv_probe+0x87/0x140 [ 524.996186][ C1] really_probe+0x282/0x9f0 [ 525.002501][ C1] driver_probe_device+0xfe/0x1d0 [ 525.009324][ C1] __device_attach_driver+0x1c2/0x220 [ 525.016509][ C1] bus_for_each_drv+0x15f/0x1e0 [ 525.023212][ C1] __device_attach+0x228/0x470 [ 525.029820][ C1] bus_probe_device+0x1e4/0x290 [ 525.036507][ C1] device_add+0xb17/0x1c40 [ 525.042744][ C1] platform_device_add+0x34f/0x6d0 [ 525.049671][ C1] platform_device_register_full+0x38c/0x4e0 [ 525.057537][ C1] alsa_card_dummy_init+0x1cc/0x2e0 [ 525.064635][ C1] do_one_initcall+0x103/0x6f0 [ 525.071422][ C1] kernel_init_freeable+0x5e9/0x66d [ 525.078438][ C1] kernel_init+0xd/0x1c0 [ 525.084480][ C1] ret_from_fork+0x1f/0x30 [ 525.090690][ C1] SOFTIRQ-ON-R at: [ 525.094738][ C1] lock_acquire+0x1f2/0xaa0 [ 525.101056][ C1] _raw_read_lock+0x5b/0x70 [ 525.107377][ C1] snd_ctl_notify.part.0+0x36/0x550 [ 525.114376][ C1] snd_ctl_notify+0x8f/0xb0 [ 525.120680][ C1] __snd_ctl_add_replace+0x638/0x800 [ 525.127759][ C1] snd_ctl_add_replace+0x76/0x130 [ 525.134579][ C1] snd_dummy_probe+0xbbf/0x1050 [ 525.141229][ C1] platform_drv_probe+0x87/0x140 [ 525.147977][ C1] really_probe+0x282/0x9f0 [ 525.154290][ C1] driver_probe_device+0xfe/0x1d0 [ 525.161112][ C1] __device_attach_driver+0x1c2/0x220 [ 525.168294][ C1] bus_for_each_drv+0x15f/0x1e0 [ 525.174940][ C1] __device_attach+0x228/0x470 [ 525.181513][ C1] bus_probe_device+0x1e4/0x290 [ 525.188157][ C1] device_add+0xb17/0x1c40 [ 525.194372][ C1] platform_device_add+0x34f/0x6d0 [ 525.201284][ C1] platform_device_register_full+0x38c/0x4e0 [ 525.209079][ C1] alsa_card_dummy_init+0x1cc/0x2e0 [ 525.216075][ C1] do_one_initcall+0x103/0x6f0 [ 525.222637][ C1] kernel_init_freeable+0x5e9/0x66d [ 525.229634][ C1] kernel_init+0xd/0x1c0 [ 525.235674][ C1] ret_from_fork+0x1f/0x30 [ 525.241887][ C1] (null) at: [ 525.245519][ C1] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN [ 525.257217][ C1] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] [ 525.265616][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.9.0-rc4-next-20200911-syzkaller #0 [ 525.274744][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 525.284813][ C1] RIP: 0010:print_shortest_lock_dependencies.cold+0x110/0x2af [ 525.292243][ C1] Code: 48 8b 04 24 48 c1 e8 03 42 80 3c 20 00 74 09 48 8b 3c 24 e8 5b 11 da f9 48 8b 04 24 48 8b 00 48 8d 78 14 48 89 fa 48 c1 ea 03 <42> 0f b6 0c 22 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 [ 525.311851][ C1] RSP: 0018:ffffc90000da8898 EFLAGS: 00010003 [ 525.317933][ C1] RAX: 0000000000000001 RBX: ffffffff8cbdfc00 RCX: 0000000000000000 [ 525.325915][ C1] RDX: 0000000000000002 RSI: ffffffff815c0ec7 RDI: 0000000000000015 [ 525.333860][ C1] RBP: ffffc90000da89c8 R08: 0000000000000004 R09: ffff8880ae720f8b [ 525.341824][ C1] R10: 0000000000000000 R11: 6c756e2820202020 R12: dffffc0000000000 [ 525.349790][ C1] R13: ffffffff8c9e7288 R14: 0000000000000009 R15: 0000000000000001 [ 525.357787][ C1] FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 525.366693][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 525.373255][ C1] CR2: 00000000004cca70 CR3: 000000008e4e4000 CR4: 00000000001506e0 [ 525.381209][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 525.389158][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 525.397104][ C1] Call Trace: [ 525.400421][ C1] [ 525.403274][ C1] print_irq_inversion_bug.part.0+0x2c6/0x2ee [ 525.409339][ C1] mark_lock.cold+0x38/0x10d [ 525.413921][ C1] ? lock_chain_count+0x20/0x20 [ 525.418760][ C1] ? lock_is_held_type+0xbb/0xf0 [ 525.423694][ C1] ? find_held_lock+0x2d/0x110 [ 525.428578][ C1] ? debug_object_activate+0x287/0x3e0 [ 525.434018][ C1] ? lock_downgrade+0x830/0x830 [ 525.438887][ C1] __lock_acquire+0x117d/0x55d0 [ 525.443735][ C1] ? lock_downgrade+0x830/0x830 [ 525.448594][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 525.454572][ C1] ? mark_lock+0xf7/0x2300 [ 525.458973][ C1] lock_acquire+0x1f2/0xaa0 [ 525.463475][ C1] ? _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 525.469494][ C1] ? lock_release+0x890/0x890 [ 525.474160][ C1] ? find_held_lock+0x2d/0x110 [ 525.478903][ C1] ? loopback_jiffies_timer_function+0x188/0x220 [ 525.485239][ C1] ? _raw_spin_lock_irqsave+0xa9/0xd0 [ 525.490595][ C1] _raw_spin_lock_irqsave+0x94/0xd0 [ 525.495771][ C1] ? _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 525.501637][ C1] _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 525.507332][ C1] snd_pcm_period_elapsed+0x24/0x250 [ 525.512625][ C1] loopback_jiffies_timer_function+0x1a8/0x220 [ 525.518755][ C1] ? loopback_jiffies_timer_pos_update+0xf60/0xf60 [ 525.525230][ C1] call_timer_fn+0x1a5/0x6b0 [ 525.529811][ C1] ? add_timer_on+0x450/0x450 [ 525.534464][ C1] ? lock_downgrade+0x830/0x830 [ 525.539304][ C1] ? _raw_spin_unlock_irq+0x1f/0x80 [ 525.544481][ C1] ? loopback_jiffies_timer_pos_update+0xf60/0xf60 [ 525.550965][ C1] __run_timers.part.0+0x67c/0xa50 [ 525.556053][ C1] ? call_timer_fn+0x6b0/0x6b0 [ 525.560854][ C1] ? lapic_next_event+0x4d/0x80 [ 525.565738][ C1] ? clockevents_program_event+0x12b/0x350 [ 525.571559][ C1] ? kvm_sched_clock_read+0x14/0x40 [ 525.576788][ C1] ? sched_clock+0x2a/0x40 [ 525.581218][ C1] ? sched_clock_cpu+0x18/0x1b0 [ 525.586045][ C1] ? hrtimer_interrupt+0x6ea/0x930 [ 525.591130][ C1] run_timer_softirq+0xae/0x1a0 [ 525.595959][ C1] __do_softirq+0x202/0xa42 [ 525.600461][ C1] asm_call_on_stack+0xf/0x20 [ 525.605109][ C1] [ 525.608057][ C1] do_softirq_own_stack+0x9d/0xd0 [ 525.613090][ C1] irq_exit_rcu+0x235/0x280 [ 525.617589][ C1] sysvec_apic_timer_interrupt+0x51/0xf0 [ 525.623206][ C1] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 525.629174][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 525.634535][ C1] Code: ff 4c 89 ef e8 93 d9 af f9 e9 8e fe ff ff 48 89 df e8 86 d9 af f9 eb 8a cc cc cc cc e9 07 00 00 00 0f 00 2d 84 87 65 00 fb f4 90 e9 07 00 00 00 0f 00 2d 74 87 65 00 f4 c3 cc cc 55 53 e8 69 [ 525.654135][ C1] RSP: 0018:ffffc90000d3fd10 EFLAGS: 00000293 [ 525.660179][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffffffff15cacb9 [ 525.668127][ C1] RDX: ffff8880a9630340 RSI: ffffffff88034020 RDI: 0000000000000000 [ 525.676074][ C1] RBP: ffff8880a627d064 R08: 0000000000000001 R09: 0000000000000001 [ 525.684019][ C1] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880a627d064 [ 525.691974][ C1] R13: 1ffff920001a7fac R14: ffff8880a627d065 R15: 0000000000000001 [ 525.699944][ C1] ? acpi_safe_halt+0x90/0x180 [ 525.704684][ C1] acpi_safe_halt+0x95/0x180 [ 525.709248][ C1] acpi_idle_do_entry+0x15c/0x1b0 [ 525.714338][ C1] acpi_idle_enter+0x403/0xac0 [ 525.719082][ C1] ? acpi_idle_enter_bm+0x2d0/0x2d0 [ 525.724317][ C1] cpuidle_enter_state+0x150/0xa70 [ 525.729424][ C1] cpuidle_enter+0x4a/0xa0 [ 525.733818][ C1] do_idle+0x48e/0x730 [ 525.737863][ C1] ? arch_cpu_idle_exit+0x70/0x70 [ 525.742901][ C1] ? _raw_write_unlock_irqrestore+0x70/0x90 [ 525.748770][ C1] ? lockdep_hardirqs_on+0x53/0x100 [ 525.753941][ C1] cpu_startup_entry+0x14/0x20 [ 525.758706][ C1] secondary_startup_64_no_verify+0xa6/0xab [ 525.764595][ C1] Modules linked in: [ 525.768488][ C1] ---[ end trace 1424f675fd8ea086 ]--- [ 525.773938][ C1] RIP: 0010:print_shortest_lock_dependencies.cold+0x110/0x2af [ 525.781367][ C1] Code: 48 8b 04 24 48 c1 e8 03 42 80 3c 20 00 74 09 48 8b 3c 24 e8 5b 11 da f9 48 8b 04 24 48 8b 00 48 8d 78 14 48 89 fa 48 c1 ea 03 <42> 0f b6 0c 22 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 [ 525.800941][ C1] RSP: 0018:ffffc90000da8898 EFLAGS: 00010003 [ 525.806987][ C1] RAX: 0000000000000001 RBX: ffffffff8cbdfc00 RCX: 0000000000000000 [ 525.814932][ C1] RDX: 0000000000000002 RSI: ffffffff815c0ec7 RDI: 0000000000000015 [ 525.822880][ C1] RBP: ffffc90000da89c8 R08: 0000000000000004 R09: ffff8880ae720f8b [ 525.830846][ C1] R10: 0000000000000000 R11: 6c756e2820202020 R12: dffffc0000000000 [ 525.838814][ C1] R13: ffffffff8c9e7288 R14: 0000000000000009 R15: 0000000000000001 [ 525.846787][ C1] FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 525.855688][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 525.862265][ C1] CR2: 00000000004cca70 CR3: 000000008e4e4000 CR4: 00000000001506e0 [ 525.870228][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 525.878174][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 525.886120][ C1] Kernel panic - not syncing: Fatal exception in interrupt [ 525.894324][ C1] Kernel Offset: disabled [ 525.898652][ C1] Rebooting in 86400 seconds..