[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 67.467582][ C1] [ 67.470038][ C1] ======================================================== [ 67.477325][ C1] WARNING: possible irq lock inversion dependency detected [ 67.484521][ C1] 5.9.0-rc5-next-20200915-syzkaller #0 Not tainted [ 67.491388][ C1] -------------------------------------------------------- [ 67.498828][ C1] swapper/1/0 just changed the state of lock: [ 67.505050][ C1] ffff888214c0a108 (&group->lock){..-.}-{2:2}, at: _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 67.514964][ C1] but this lock took another, SOFTIRQ-READ-unsafe lock in the past: [ 67.522943][ C1] (&card->ctl_files_rwlock){.+.+}-{2:2} [ 67.522955][ C1] [ 67.522955][ C1] [ 67.522955][ C1] and interrupts could create inverse lock ordering between them. [ 67.522955][ C1] [ 67.543094][ C1] [ 67.543094][ C1] other info that might help us debug this: [ 67.551249][ C1] Possible interrupt unsafe locking scenario: [ 67.551249][ C1] [ 67.559552][ C1] CPU0 CPU1 [ 67.564942][ C1] ---- ---- [ 67.570288][ C1] lock(&card->ctl_files_rwlock); [ 67.575859][ C1] local_irq_disable(); [ 67.582718][ C1] lock(&group->lock); [ 67.589396][ C1] lock(&card->ctl_files_rwlock); [ 67.597299][ C1] [ 67.600768][ C1] lock(&group->lock); [ 67.605112][ C1] [ 67.605112][ C1] *** DEADLOCK *** [ 67.605112][ C1] [ 67.613622][ C1] 1 lock held by swapper/1/0: [ 67.618281][ C1] #0: ffffc90000da8d80 ((&dpcm->timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x6b0 [ 67.627808][ C1] [ 67.627808][ C1] the shortest dependencies between 2nd lock and 1st lock: [ 67.637296][ C1] -> (&card->ctl_files_rwlock){.+.+}-{2:2} { [ 67.643360][ C1] HARDIRQ-ON-R at: [ 67.647450][ C1] lock_acquire+0x1f2/0xaa0 [ 67.654291][ C1] _raw_read_lock+0x5b/0x70 [ 67.660723][ C1] snd_ctl_notify.part.0+0x36/0x550 [ 67.668389][ C1] snd_ctl_notify+0x8f/0xb0 [ 67.674970][ C1] __snd_ctl_add_replace+0x638/0x800 [ 67.682216][ C1] snd_ctl_add_replace+0x76/0x130 [ 67.689141][ C1] snd_dummy_probe+0xbbf/0x1050 [ 67.695907][ C1] platform_drv_probe+0x87/0x140 [ 67.703338][ C1] really_probe+0x282/0x9f0 [ 67.710245][ C1] driver_probe_device+0xfe/0x1d0 [ 67.717328][ C1] __device_attach_driver+0x1c2/0x220 [ 67.724941][ C1] bus_for_each_drv+0x15f/0x1e0 [ 67.731997][ C1] __device_attach+0x228/0x470 [ 67.739003][ C1] bus_probe_device+0x1e4/0x290 [ 67.746327][ C1] device_add+0xb17/0x1c40 [ 67.753049][ C1] platform_device_add+0x34f/0x6d0 [ 67.760968][ C1] platform_device_register_full+0x38c/0x4e0 [ 67.768772][ C1] alsa_card_dummy_init+0x1cc/0x2e0 [ 67.775886][ C1] do_one_initcall+0x103/0x6f0 [ 67.782847][ C1] kernel_init_freeable+0x5e9/0x66d [ 67.790263][ C1] kernel_init+0xd/0x1c0 [ 67.796324][ C1] ret_from_fork+0x1f/0x30 [ 67.802934][ C1] SOFTIRQ-ON-R at: [ 67.807012][ C1] lock_acquire+0x1f2/0xaa0 [ 67.813503][ C1] _raw_read_lock+0x5b/0x70 [ 67.820478][ C1] snd_ctl_notify.part.0+0x36/0x550 [ 67.830665][ C1] snd_ctl_notify+0x8f/0xb0 [ 67.837040][ C1] __snd_ctl_add_replace+0x638/0x800 [ 67.844698][ C1] snd_ctl_add_replace+0x76/0x130 [ 67.851955][ C1] snd_dummy_probe+0xbbf/0x1050 [ 67.858670][ C1] platform_drv_probe+0x87/0x140 [ 67.865428][ C1] really_probe+0x282/0x9f0 [ 67.872450][ C1] driver_probe_device+0xfe/0x1d0 [ 67.879813][ C1] __device_attach_driver+0x1c2/0x220 [ 67.888094][ C1] bus_for_each_drv+0x15f/0x1e0 [ 67.895732][ C1] __device_attach+0x228/0x470 [ 67.902451][ C1] bus_probe_device+0x1e4/0x290 [ 67.909246][ C1] device_add+0xb17/0x1c40 [ 67.916288][ C1] platform_device_add+0x34f/0x6d0 [ 67.923878][ C1] platform_device_register_full+0x38c/0x4e0 [ 67.931831][ C1] alsa_card_dummy_init+0x1cc/0x2e0 [ 67.939232][ C1] do_one_initcall+0x103/0x6f0 [ 67.946184][ C1] kernel_init_freeable+0x5e9/0x66d [ 67.953516][ C1] kernel_init+0xd/0x1c0 [ 67.959811][ C1] ret_from_fork+0x1f/0x30 [ 67.966208][ C1] (null) at: [ 67.969887][ C1] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN [ 67.982450][ C1] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] [ 67.992230][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.9.0-rc5-next-20200915-syzkaller #0 [ 68.001738][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.012036][ C1] RIP: 0010:print_shortest_lock_dependencies.cold+0x110/0x2af [ 68.019875][ C1] Code: 48 8b 04 24 48 c1 e8 03 42 80 3c 20 00 74 09 48 8b 3c 24 e8 b1 21 d9 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 [ 68.041041][ C1] RSP: 0018:ffffc90000da8898 EFLAGS: 00010003 [ 68.048432][ C1] RAX: 0000000000000001 RBX: ffffffff8cbe1de0 RCX: 0000000000000000 [ 68.056863][ C1] RDX: 0000000000000002 RSI: ffffffff815c26a7 RDI: 0000000000000015 [ 68.065781][ C1] RBP: ffffc90000da89c8 R08: 0000000000000004 R09: ffff8880ae720f8b [ 68.074799][ C1] R10: 0000000000000000 R11: 6c756e2820202020 R12: dffffc0000000000 [ 68.083899][ C1] R13: ffffffff8c9ee470 R14: 0000000000000009 R15: 0000000000000001 [ 68.095158][ C1] FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 68.105933][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 68.112782][ C1] CR2: 0000000020000180 CR3: 0000000009c8e000 CR4: 00000000001506e0 [ 68.121244][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 68.129787][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 68.138294][ C1] Call Trace: [ 68.141608][ C1] [ 68.144629][ C1] print_irq_inversion_bug.part.0+0x2c6/0x2ee [ 68.150796][ C1] mark_lock.cold+0x38/0x10d [ 68.155603][ C1] ? lock_chain_count+0x20/0x20 [ 68.160778][ C1] ? lock_is_held_type+0xbb/0xf0 [ 68.166088][ C1] ? find_held_lock+0x2d/0x110 [ 68.171539][ C1] ? debug_object_activate+0x287/0x3e0 [ 68.177822][ C1] ? lock_downgrade+0x830/0x830 [ 68.183232][ C1] __lock_acquire+0x117d/0x55d0 [ 68.188495][ C1] ? lock_downgrade+0x830/0x830 [ 68.193345][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 68.199555][ C1] ? mark_lock+0xf7/0x2300 [ 68.209037][ C1] lock_acquire+0x1f2/0xaa0 [ 68.214578][ C1] ? _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 68.220773][ C1] ? lock_release+0x890/0x890 [ 68.226484][ C1] ? find_held_lock+0x2d/0x110 [ 68.231520][ C1] ? loopback_jiffies_timer_function+0x188/0x220 [ 68.238526][ C1] ? _raw_spin_lock_irqsave+0xa9/0xd0 [ 68.244169][ C1] _raw_spin_lock_irqsave+0x94/0xd0 [ 68.249640][ C1] ? _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 68.256385][ C1] _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 68.263994][ C1] snd_pcm_period_elapsed+0x24/0x250 [ 68.269364][ C1] loopback_jiffies_timer_function+0x1a8/0x220 [ 68.276048][ C1] ? loopback_jiffies_timer_pos_update+0xf60/0xf60 [ 68.284985][ C1] call_timer_fn+0x1a5/0x6b0 [ 68.290055][ C1] ? add_timer_on+0x450/0x450 [ 68.294969][ C1] ? lock_downgrade+0x830/0x830 [ 68.299979][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 68.305133][ C1] ? _raw_spin_unlock_irq+0x1f/0x80 [ 68.311086][ C1] ? loopback_jiffies_timer_pos_update+0xf60/0xf60 [ 68.317674][ C1] __run_timers.part.0+0x67c/0xa50 [ 68.323287][ C1] ? call_timer_fn+0x6b0/0x6b0 [ 68.328625][ C1] ? lapic_next_event+0x4d/0x80 [ 68.334079][ C1] ? clockevents_program_event+0x12b/0x350 [ 68.340924][ C1] ? kvm_sched_clock_read+0x14/0x40 [ 68.347630][ C1] ? sched_clock+0x2a/0x40 [ 68.352559][ C1] ? sched_clock_cpu+0x18/0x1b0 [ 68.357756][ C1] ? hrtimer_interrupt+0x6ea/0x930 [ 68.363224][ C1] run_timer_softirq+0xae/0x1a0 [ 68.368355][ C1] __do_softirq+0x202/0xa42 [ 68.373058][ C1] asm_call_on_stack+0xf/0x20 [ 68.377861][ C1] [ 68.381035][ C1] do_softirq_own_stack+0x9d/0xd0 [ 68.386174][ C1] irq_exit_rcu+0x235/0x280 [ 68.390990][ C1] sysvec_apic_timer_interrupt+0x51/0xf0 [ 68.396827][ C1] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 68.403092][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 68.409096][ C1] Code: ff 4c 89 ef e8 b3 df ae f9 e9 8e fe ff ff 48 89 df e8 a6 df ae f9 eb 8a cc cc cc cc e9 07 00 00 00 0f 00 2d b4 5c 64 00 fb f4 90 e9 07 00 00 00 0f 00 2d a4 5c 64 00 f4 c3 cc cc 55 53 e8 19 [ 68.437231][ C1] RSP: 0018:ffffc90000d3fd10 EFLAGS: 00000293 [ 68.444485][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffffffff15cb631 [ 68.454950][ C1] RDX: ffff8880a9632340 RSI: ffffffff88046c90 RDI: 0000000000000000 [ 68.465188][ C1] RBP: ffff8880a62d8864 R08: 0000000000000001 R09: 0000000000000001 [ 68.474896][ C1] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880a62d8864 [ 68.484055][ C1] R13: 1ffff920001a7fac R14: ffff8880a62d8865 R15: 0000000000000001 [ 68.492300][ C1] ? acpi_safe_halt+0x90/0x180 [ 68.497362][ C1] acpi_safe_halt+0x95/0x180 [ 68.501950][ C1] acpi_idle_do_entry+0x15c/0x1b0 [ 68.506961][ C1] acpi_idle_enter+0x403/0xac0 [ 68.511807][ C1] ? acpi_idle_enter_bm+0x2d0/0x2d0 [ 68.516993][ C1] cpuidle_enter_state+0x150/0xa70 [ 68.522822][ C1] ? tick_nohz_idle_stop_tick+0x504/0xbc0 [ 68.528859][ C1] cpuidle_enter+0x4a/0xa0 [ 68.533369][ C1] do_idle+0x48e/0x730 [ 68.537576][ C1] ? arch_cpu_idle_exit+0x70/0x70 [ 68.542873][ C1] ? _raw_write_unlock_irqrestore+0x1/0x90 [ 68.549022][ C1] ? lockdep_hardirqs_on+0x53/0x100 [ 68.555025][ C1] cpu_startup_entry+0x14/0x20 [ 68.560938][ C1] secondary_startup_64_no_verify+0xa6/0xab [ 68.567429][ C1] Modules linked in: [ 68.571967][ C1] ---[ end trace a5ccccd467767e4f ]--- [ 68.578485][ C1] RIP: 0010:print_shortest_lock_dependencies.cold+0x110/0x2af [ 68.587668][ C1] Code: 48 8b 04 24 48 c1 e8 03 42 80 3c 20 00 74 09 48 8b 3c 24 e8 b1 21 d9 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 [ 68.613191][ C1] RSP: 0018:ffffc90000da8898 EFLAGS: 00010003 [ 68.620185][ C1] RAX: 0000000000000001 RBX: ffffffff8cbe1de0 RCX: 0000000000000000 [ 68.630104][ C1] RDX: 0000000000000002 RSI: ffffffff815c26a7 RDI: 0000000000000015 [ 68.640721][ C1] RBP: ffffc90000da89c8 R08: 0000000000000004 R09: ffff8880ae720f8b [ 68.649518][ C1] R10: 0000000000000000 R11: 6c756e2820202020 R12: dffffc0000000000 [ 68.659074][ C1] R13: ffffffff8c9ee470 R14: 0000000000000009 R15: 0000000000000001 [ 68.670636][ C1] FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 68.681632][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 68.689143][ C1] CR2: 0000000020000180 CR3: 0000000009c8e000 CR4: 00000000001506e0 [ 68.698374][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 68.707254][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 68.715554][ C1] Kernel panic - not syncing: Fatal exception in interrupt [ 68.728366][ C1] Kernel Offset: disabled [ 68.735280][ C1] Rebooting in 86400 seconds..