Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.175' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 64.661236][ C0] [ 64.663742][ C0] ======================================================== [ 64.670925][ C0] WARNING: possible irq lock inversion dependency detected [ 64.678109][ C0] 5.9.0-rc4-next-20200911-syzkaller #0 Not tainted [ 64.684574][ C0] -------------------------------------------------------- [ 64.691746][ C0] swapper/0/0 just changed the state of lock: [ 64.697777][ C0] ffff888099f02908 (&group->lock){..-.}-{2:2}, at: _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 64.707652][ C0] but this lock took another, SOFTIRQ-READ-unsafe lock in the past: [ 64.715592][ C0] (&card->ctl_files_rwlock){.+.+}-{2:2} [ 64.715604][ C0] [ 64.715604][ C0] [ 64.715604][ C0] and interrupts could create inverse lock ordering between them. [ 64.715604][ C0] [ 64.735472][ C0] [ 64.735472][ C0] other info that might help us debug this: [ 64.743507][ C0] Possible interrupt unsafe locking scenario: [ 64.743507][ C0] [ 64.751797][ C0] CPU0 CPU1 [ 64.757159][ C0] ---- ---- [ 64.762494][ C0] lock(&card->ctl_files_rwlock); [ 64.767574][ C0] local_irq_disable(); [ 64.774313][ C0] lock(&group->lock); [ 64.780970][ C0] lock(&card->ctl_files_rwlock); [ 64.788571][ C0] [ 64.792032][ C0] lock(&group->lock); [ 64.796380][ C0] [ 64.796380][ C0] *** DEADLOCK *** [ 64.796380][ C0] [ 64.804498][ C0] 1 lock held by swapper/0/0: [ 64.809140][ C0] #0: ffffc90000007d80 ((&dpcm->timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x6b0 [ 64.818420][ C0] [ 64.818420][ C0] the shortest dependencies between 2nd lock and 1st lock: [ 64.827761][ C0] -> (&card->ctl_files_rwlock){.+.+}-{2:2} { [ 64.833805][ C0] HARDIRQ-ON-R at: [ 64.837848][ C0] lock_acquire+0x1f2/0xaa0 [ 64.844157][ C0] _raw_read_lock+0x5b/0x70 [ 64.850466][ C0] snd_ctl_notify.part.0+0x36/0x550 [ 64.857463][ C0] snd_ctl_notify+0x8f/0xb0 [ 64.863825][ C0] __snd_ctl_add_replace+0x638/0x800 [ 64.870903][ C0] snd_ctl_add_replace+0x76/0x130 [ 64.877721][ C0] snd_dummy_probe+0xbbf/0x1050 [ 64.884382][ C0] platform_drv_probe+0x87/0x140 [ 64.891115][ C0] really_probe+0x282/0x9f0 [ 64.897452][ C0] driver_probe_device+0xfe/0x1d0 [ 64.904270][ C0] __device_attach_driver+0x1c2/0x220 [ 64.911470][ C0] bus_for_each_drv+0x15f/0x1e0 [ 64.918166][ C0] __device_attach+0x228/0x470 [ 64.924731][ C0] bus_probe_device+0x1e4/0x290 [ 64.931375][ C0] device_add+0xb17/0x1c40 [ 64.937583][ C0] platform_device_add+0x34f/0x6d0 [ 64.944492][ C0] platform_device_register_full+0x38c/0x4e0 [ 64.952282][ C0] alsa_card_dummy_init+0x1cc/0x2e0 [ 64.959276][ C0] do_one_initcall+0x103/0x6f0 [ 64.965835][ C0] kernel_init_freeable+0x5e9/0x66d [ 64.972873][ C0] kernel_init+0xd/0x1c0 [ 64.978922][ C0] ret_from_fork+0x1f/0x30 [ 64.985146][ C0] SOFTIRQ-ON-R at: [ 64.989189][ C0] lock_acquire+0x1f2/0xaa0 [ 64.995499][ C0] _raw_read_lock+0x5b/0x70 [ 65.001796][ C0] snd_ctl_notify.part.0+0x36/0x550 [ 65.008800][ C0] snd_ctl_notify+0x8f/0xb0 [ 65.015097][ C0] __snd_ctl_add_replace+0x638/0x800 [ 65.022181][ C0] snd_ctl_add_replace+0x76/0x130 [ 65.029083][ C0] snd_dummy_probe+0xbbf/0x1050 [ 65.035744][ C0] platform_drv_probe+0x87/0x140 [ 65.042509][ C0] really_probe+0x282/0x9f0 [ 65.048855][ C0] driver_probe_device+0xfe/0x1d0 [ 65.055673][ C0] __device_attach_driver+0x1c2/0x220 [ 65.062838][ C0] bus_for_each_drv+0x15f/0x1e0 [ 65.069511][ C0] __device_attach+0x228/0x470 [ 65.076070][ C0] bus_probe_device+0x1e4/0x290 [ 65.082731][ C0] device_add+0xb17/0x1c40 [ 65.088974][ C0] platform_device_add+0x34f/0x6d0 [ 65.095878][ C0] platform_device_register_full+0x38c/0x4e0 [ 65.103667][ C0] alsa_card_dummy_init+0x1cc/0x2e0 [ 65.110660][ C0] do_one_initcall+0x103/0x6f0 [ 65.117232][ C0] kernel_init_freeable+0x5e9/0x66d [ 65.124255][ C0] kernel_init+0xd/0x1c0 [ 65.130304][ C0] ret_from_fork+0x1f/0x30 [ 65.136510][ C0] (null) at: [ 65.140051][ C0] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN [ 65.151745][ C0] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] [ 65.160137][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.9.0-rc4-next-20200911-syzkaller #0 [ 65.169209][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.179255][ C0] RIP: 0010:print_shortest_lock_dependencies.cold+0x110/0x2af [ 65.186693][ C0] 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 [ 65.206356][ C0] RSP: 0018:ffffc90000007898 EFLAGS: 00010003 [ 65.212408][ C0] RAX: 0000000000000001 RBX: ffffffff8cbdd970 RCX: 0000000000000000 [ 65.220375][ C0] RDX: 0000000000000002 RSI: ffffffff815c0ec7 RDI: 0000000000000015 [ 65.228330][ C0] RBP: ffffc900000079c8 R08: 0000000000000004 R09: ffff8880ae620f8b [ 65.236274][ C0] R10: 0000000000000000 R11: 6c756e2820202020 R12: dffffc0000000000 [ 65.244217][ C0] R13: ffffffff8c9e7060 R14: 0000000000000009 R15: 0000000000000001 [ 65.252165][ C0] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 65.261063][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 65.267639][ C0] CR2: 0000559c42fbe1a8 CR3: 000000009cc56000 CR4: 00000000001506f0 [ 65.275598][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 65.283543][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 65.291500][ C0] Call Trace: [ 65.294769][ C0] [ 65.297602][ C0] print_irq_inversion_bug.part.0+0x2c6/0x2ee [ 65.303641][ C0] mark_lock.cold+0x38/0x10d [ 65.308205][ C0] ? lock_chain_count+0x20/0x20 [ 65.313028][ C0] ? lock_is_held_type+0xbb/0xf0 [ 65.318039][ C0] ? find_held_lock+0x2d/0x110 [ 65.322815][ C0] ? debug_object_activate+0x287/0x3e0 [ 65.328255][ C0] ? lock_downgrade+0x830/0x830 [ 65.333078][ C0] __lock_acquire+0x117d/0x55d0 [ 65.337948][ C0] ? lock_downgrade+0x830/0x830 [ 65.342784][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 65.348732][ C0] ? mark_lock+0xf7/0x2300 [ 65.353175][ C0] lock_acquire+0x1f2/0xaa0 [ 65.357653][ C0] ? _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 65.363537][ C0] ? lock_release+0x890/0x890 [ 65.368195][ C0] ? find_held_lock+0x2d/0x110 [ 65.372936][ C0] ? loopback_jiffies_timer_function+0x188/0x220 [ 65.379235][ C0] ? _raw_spin_lock_irqsave+0xa9/0xd0 [ 65.384578][ C0] _raw_spin_lock_irqsave+0x94/0xd0 [ 65.389764][ C0] ? _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 65.395644][ C0] _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 65.401384][ C0] snd_pcm_period_elapsed+0x24/0x250 [ 65.406653][ C0] loopback_jiffies_timer_function+0x1a8/0x220 [ 65.412782][ C0] ? loopback_jiffies_timer_pos_update+0xf60/0xf60 [ 65.419256][ C0] call_timer_fn+0x1a5/0x6b0 [ 65.423817][ C0] ? add_timer_on+0x450/0x450 [ 65.428466][ C0] ? lock_downgrade+0x830/0x830 [ 65.433297][ C0] ? _raw_spin_unlock_irq+0x1f/0x80 [ 65.438492][ C0] ? loopback_jiffies_timer_pos_update+0xf60/0xf60 [ 65.444965][ C0] __run_timers.part.0+0x67c/0xa50 [ 65.450075][ C0] ? call_timer_fn+0x6b0/0x6b0 [ 65.454822][ C0] ? lapic_next_event+0x4d/0x80 [ 65.459644][ C0] ? clockevents_program_event+0x12b/0x350 [ 65.465426][ C0] ? kvm_sched_clock_read+0x14/0x40 [ 65.470593][ C0] ? sched_clock+0x2a/0x40 [ 65.474996][ C0] ? sched_clock_cpu+0x18/0x1b0 [ 65.479843][ C0] ? hrtimer_interrupt+0x6ea/0x930 [ 65.484936][ C0] run_timer_softirq+0xae/0x1a0 [ 65.489758][ C0] __do_softirq+0x202/0xa42 [ 65.494239][ C0] asm_call_on_stack+0xf/0x20 [ 65.498899][ C0] [ 65.501840][ C0] do_softirq_own_stack+0x9d/0xd0 [ 65.506915][ C0] irq_exit_rcu+0x235/0x280 [ 65.511392][ C0] sysvec_apic_timer_interrupt+0x51/0xf0 [ 65.517094][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 65.523140][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 65.528486][ C0] 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 [ 65.548059][ C0] RSP: 0018:ffffffff89c07cd8 EFLAGS: 00000293 [ 65.554097][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffffffff15cacb9 [ 65.562040][ C0] RDX: ffffffff89c9b040 RSI: ffffffff88034020 RDI: 0000000000000000 [ 65.570021][ C0] RBP: ffff88821a86b064 R08: 0000000000000001 R09: 0000000000000001 [ 65.578029][ C0] R10: 0000000000000000 R11: 0000000000000001 R12: ffff88821a86b064 [ 65.585981][ C0] R13: 1ffffffff1380fa5 R14: ffff88821a86b065 R15: 0000000000000001 [ 65.593929][ C0] ? acpi_safe_halt+0x90/0x180 [ 65.598665][ C0] acpi_safe_halt+0x95/0x180 [ 65.603228][ C0] acpi_idle_do_entry+0x15c/0x1b0 [ 65.608226][ C0] acpi_idle_enter+0x403/0xac0 [ 65.612964][ C0] ? acpi_idle_enter_bm+0x2d0/0x2d0 [ 65.618149][ C0] cpuidle_enter_state+0x150/0xa70 [ 65.623237][ C0] ? tick_nohz_idle_stop_tick+0x5af/0xbc0 [ 65.628927][ C0] cpuidle_enter+0x4a/0xa0 [ 65.633317][ C0] do_idle+0x48e/0x730 [ 65.637371][ C0] ? arch_cpu_idle_exit+0x70/0x70 [ 65.643800][ C0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 65.650066][ C0] cpu_startup_entry+0x14/0x20 [ 65.654804][ C0] start_kernel+0x490/0x4b1 [ 65.659293][ C0] secondary_startup_64_no_verify+0xa6/0xab [ 65.665154][ C0] Modules linked in: [ 65.669030][ C0] ---[ end trace dd1063d5ac83567b ]--- [ 65.674467][ C0] RIP: 0010:print_shortest_lock_dependencies.cold+0x110/0x2af [ 65.681898][ C0] 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 [ 65.701472][ C0] RSP: 0018:ffffc90000007898 EFLAGS: 00010003 [ 65.707513][ C0] RAX: 0000000000000001 RBX: ffffffff8cbdd970 RCX: 0000000000000000 [ 65.715455][ C0] RDX: 0000000000000002 RSI: ffffffff815c0ec7 RDI: 0000000000000015 [ 65.723411][ C0] RBP: ffffc900000079c8 R08: 0000000000000004 R09: ffff8880ae620f8b [ 65.731356][ C0] R10: 0000000000000000 R11: 6c756e2820202020 R12: dffffc0000000000 [ 65.739297][ C0] R13: ffffffff8c9e7060 R14: 0000000000000009 R15: 0000000000000001 [ 65.747277][ C0] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 65.756204][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 65.762757][ C0] CR2: 0000559c42fbe1a8 CR3: 000000009cc56000 CR4: 00000000001506f0 [ 65.770701][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 65.778668][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 65.786610][ C0] Kernel panic - not syncing: Fatal exception in interrupt [ 65.795018][ C0] Kernel Offset: disabled [ 65.799332][ C0] Rebooting in 86400 seconds..