[ 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 '10.128.0.42' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 64.110206][ C0] [ 64.112599][ C0] ======================================================== [ 64.119764][ C0] WARNING: possible irq lock inversion dependency detected [ 64.126926][ C0] 5.9.0-rc4-next-20200911-syzkaller #0 Not tainted [ 64.133393][ C0] -------------------------------------------------------- [ 64.140564][ C0] swapper/0/0 just changed the state of lock: [ 64.146594][ C0] ffff88809a17d908 (&group->lock){..-.}-{2:2}, at: _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 64.156470][ C0] but this lock took another, SOFTIRQ-READ-unsafe lock in the past: [ 64.164416][ C0] (&card->ctl_files_rwlock){.+.+}-{2:2} [ 64.164426][ C0] [ 64.164426][ C0] [ 64.164426][ C0] and interrupts could create inverse lock ordering between them. [ 64.164426][ C0] [ 64.184491][ C0] [ 64.184491][ C0] other info that might help us debug this: [ 64.192539][ C0] Possible interrupt unsafe locking scenario: [ 64.192539][ C0] [ 64.200827][ C0] CPU0 CPU1 [ 64.206173][ C0] ---- ---- [ 64.211600][ C0] lock(&card->ctl_files_rwlock); [ 64.216697][ C0] local_irq_disable(); [ 64.223425][ C0] lock(&group->lock); [ 64.230070][ C0] lock(&card->ctl_files_rwlock); [ 64.237682][ C0] [ 64.241130][ C0] lock(&group->lock); [ 64.245465][ C0] [ 64.245465][ C0] *** DEADLOCK *** [ 64.245465][ C0] [ 64.253586][ C0] 1 lock held by swapper/0/0: [ 64.258243][ C0] #0: ffffc90000007d80 ((&dpcm->timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x6b0 [ 64.267520][ C0] [ 64.267520][ C0] the shortest dependencies between 2nd lock and 1st lock: [ 64.277066][ C0] -> (&card->ctl_files_rwlock){.+.+}-{2:2} { [ 64.283110][ C0] HARDIRQ-ON-R at: [ 64.287155][ C0] lock_acquire+0x1f2/0xaa0 [ 64.293455][ C0] _raw_read_lock+0x5b/0x70 [ 64.299753][ C0] snd_ctl_notify.part.0+0x36/0x550 [ 64.306748][ C0] snd_ctl_notify+0x8f/0xb0 [ 64.313046][ C0] __snd_ctl_add_replace+0x638/0x800 [ 64.320138][ C0] snd_ctl_add_replace+0x76/0x130 [ 64.326954][ C0] snd_dummy_probe+0xbbf/0x1050 [ 64.333600][ C0] platform_drv_probe+0x87/0x140 [ 64.340342][ C0] really_probe+0x282/0x9f0 [ 64.346647][ C0] driver_probe_device+0xfe/0x1d0 [ 64.353480][ C0] __device_attach_driver+0x1c2/0x220 [ 64.360644][ C0] bus_for_each_drv+0x15f/0x1e0 [ 64.367291][ C0] __device_attach+0x228/0x470 [ 64.373862][ C0] bus_probe_device+0x1e4/0x290 [ 64.380506][ C0] device_add+0xb17/0x1c40 [ 64.386716][ C0] platform_device_add+0x34f/0x6d0 [ 64.393623][ C0] platform_device_register_full+0x38c/0x4e0 [ 64.401416][ C0] alsa_card_dummy_init+0x1cc/0x2e0 [ 64.408409][ C0] do_one_initcall+0x103/0x6f0 [ 64.414967][ C0] kernel_init_freeable+0x5e9/0x66d [ 64.421959][ C0] kernel_init+0xd/0x1c0 [ 64.427994][ C0] ret_from_fork+0x1f/0x30 [ 64.434208][ C0] SOFTIRQ-ON-R at: [ 64.438251][ C0] lock_acquire+0x1f2/0xaa0 [ 64.444547][ C0] _raw_read_lock+0x5b/0x70 [ 64.450845][ C0] snd_ctl_notify.part.0+0x36/0x550 [ 64.457844][ C0] snd_ctl_notify+0x8f/0xb0 [ 64.464150][ C0] __snd_ctl_add_replace+0x638/0x800 [ 64.471238][ C0] snd_ctl_add_replace+0x76/0x130 [ 64.478053][ C0] snd_dummy_probe+0xbbf/0x1050 [ 64.484699][ C0] platform_drv_probe+0x87/0x140 [ 64.491431][ C0] really_probe+0x282/0x9f0 [ 64.497814][ C0] driver_probe_device+0xfe/0x1d0 [ 64.504739][ C0] __device_attach_driver+0x1c2/0x220 [ 64.511919][ C0] bus_for_each_drv+0x15f/0x1e0 [ 64.518562][ C0] __device_attach+0x228/0x470 [ 64.525117][ C0] bus_probe_device+0x1e4/0x290 [ 64.531758][ C0] device_add+0xb17/0x1c40 [ 64.537979][ C0] platform_device_add+0x34f/0x6d0 [ 64.544895][ C0] platform_device_register_full+0x38c/0x4e0 [ 64.552677][ C0] alsa_card_dummy_init+0x1cc/0x2e0 [ 64.559683][ C0] do_one_initcall+0x103/0x6f0 [ 64.566250][ C0] kernel_init_freeable+0x5e9/0x66d [ 64.573308][ C0] kernel_init+0xd/0x1c0 [ 64.579365][ C0] ret_from_fork+0x1f/0x30 [ 64.585595][ C0] (null) at: [ 64.589159][ C0] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN [ 64.600840][ C0] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] [ 64.609234][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.9.0-rc4-next-20200911-syzkaller #0 [ 64.618320][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.628365][ C0] RIP: 0010:print_shortest_lock_dependencies.cold+0x110/0x2af [ 64.635850][ 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 [ 64.655426][ C0] RSP: 0018:ffffc90000007898 EFLAGS: 00010003 [ 64.661464][ C0] RAX: 0000000000000001 RBX: ffffffff8cbded90 RCX: 0000000000000000 [ 64.669417][ C0] RDX: 0000000000000002 RSI: ffffffff815c0ec7 RDI: 0000000000000015 [ 64.677545][ C0] RBP: ffffc900000079c8 R08: 0000000000000004 R09: ffff8880ae620f8b [ 64.685500][ C0] R10: 0000000000000000 R11: 6c756e2820202020 R12: dffffc0000000000 [ 64.693448][ C0] R13: ffffffff8c9e74b0 R14: 0000000000000009 R15: 0000000000000001 [ 64.701403][ C0] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 64.710317][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 64.716902][ C0] CR2: 0000000020000dc0 CR3: 0000000094101000 CR4: 00000000001506f0 [ 64.725394][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 64.733353][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 64.741293][ C0] Call Trace: [ 64.744548][ C0] [ 64.747381][ C0] print_irq_inversion_bug.part.0+0x2c6/0x2ee [ 64.753421][ C0] mark_lock.cold+0x38/0x10d [ 64.757984][ C0] ? lock_chain_count+0x20/0x20 [ 64.762818][ C0] ? lock_is_held_type+0xbb/0xf0 [ 64.767725][ C0] ? find_held_lock+0x2d/0x110 [ 64.772460][ C0] ? debug_object_activate+0x287/0x3e0 [ 64.777954][ C0] ? lock_downgrade+0x830/0x830 [ 64.782848][ C0] __lock_acquire+0x117d/0x55d0 [ 64.787682][ C0] ? lock_downgrade+0x830/0x830 [ 64.792513][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 64.798465][ C0] ? mark_lock+0xf7/0x2300 [ 64.802872][ C0] lock_acquire+0x1f2/0xaa0 [ 64.807369][ C0] ? _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 64.813243][ C0] ? lock_release+0x890/0x890 [ 64.817892][ C0] ? find_held_lock+0x2d/0x110 [ 64.822642][ C0] ? loopback_jiffies_timer_function+0x188/0x220 [ 64.828956][ C0] ? _raw_spin_lock_irqsave+0xa9/0xd0 [ 64.834316][ C0] _raw_spin_lock_irqsave+0x94/0xd0 [ 64.839488][ C0] ? _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 64.845374][ C0] _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 64.851080][ C0] snd_pcm_period_elapsed+0x24/0x250 [ 64.856337][ C0] loopback_jiffies_timer_function+0x1a8/0x220 [ 64.862592][ C0] ? loopback_jiffies_timer_pos_update+0xf60/0xf60 [ 64.869105][ C0] call_timer_fn+0x1a5/0x6b0 [ 64.873673][ C0] ? add_timer_on+0x450/0x450 [ 64.878343][ C0] ? lock_downgrade+0x830/0x830 [ 64.883177][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 64.888085][ C0] ? _raw_spin_unlock_irq+0x1f/0x80 [ 64.893255][ C0] ? loopback_jiffies_timer_pos_update+0xf60/0xf60 [ 64.899731][ C0] __run_timers.part.0+0x67c/0xa50 [ 64.904815][ C0] ? call_timer_fn+0x6b0/0x6b0 [ 64.909557][ C0] ? lapic_next_event+0x4d/0x80 [ 64.914381][ C0] ? clockevents_program_event+0x12b/0x350 [ 64.920159][ C0] ? kvm_sched_clock_read+0x14/0x40 [ 64.925328][ C0] ? sched_clock+0x2a/0x40 [ 64.929727][ C0] ? sched_clock_cpu+0x18/0x1b0 [ 64.934567][ C0] ? hrtimer_interrupt+0x6ea/0x930 [ 64.939649][ C0] run_timer_softirq+0xae/0x1a0 [ 64.944481][ C0] __do_softirq+0x202/0xa42 [ 64.948961][ C0] asm_call_on_stack+0xf/0x20 [ 64.953623][ C0] [ 64.956545][ C0] do_softirq_own_stack+0x9d/0xd0 [ 64.961537][ C0] irq_exit_rcu+0x235/0x280 [ 64.966010][ C0] sysvec_apic_timer_interrupt+0x51/0xf0 [ 64.971617][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 64.977566][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 64.982906][ 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 [ 65.002497][ C0] RSP: 0018:ffffffff89c07cd8 EFLAGS: 00000293 [ 65.008573][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffffffff15cacb9 [ 65.016522][ C0] RDX: ffffffff89c9b040 RSI: ffffffff88034020 RDI: 0000000000000000 [ 65.024468][ C0] RBP: ffff8880a6310864 R08: 0000000000000001 R09: 0000000000000001 [ 65.032531][ C0] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880a6310864 [ 65.040476][ C0] R13: 1ffffffff1380fa5 R14: ffff8880a6310865 R15: 0000000000000001 [ 65.048443][ C0] ? acpi_safe_halt+0x90/0x180 [ 65.053182][ C0] acpi_safe_halt+0x95/0x180 [ 65.057743][ C0] acpi_idle_do_entry+0x15c/0x1b0 [ 65.062832][ C0] acpi_idle_enter+0x403/0xac0 [ 65.067566][ C0] ? acpi_idle_enter_bm+0x2d0/0x2d0 [ 65.072743][ C0] cpuidle_enter_state+0x150/0xa70 [ 65.077870][ C0] ? tick_nohz_idle_stop_tick+0x504/0xbc0 [ 65.083586][ C0] cpuidle_enter+0x4a/0xa0 [ 65.087982][ C0] do_idle+0x48e/0x730 [ 65.092031][ C0] ? arch_cpu_idle_exit+0x70/0x70 [ 65.097032][ C0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 65.103262][ C0] cpu_startup_entry+0x14/0x20 [ 65.108007][ C0] start_kernel+0x490/0x4b1 [ 65.112490][ C0] secondary_startup_64_no_verify+0xa6/0xab [ 65.118413][ C0] Modules linked in: [ 65.122400][ C0] ---[ end trace 4c4e63b2ab05de2b ]--- [ 65.128194][ C0] RIP: 0010:print_shortest_lock_dependencies.cold+0x110/0x2af [ 65.136373][ 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 [ 65.156046][ C0] RSP: 0018:ffffc90000007898 EFLAGS: 00010003 [ 65.162086][ C0] RAX: 0000000000000001 RBX: ffffffff8cbded90 RCX: 0000000000000000 [ 65.170041][ C0] RDX: 0000000000000002 RSI: ffffffff815c0ec7 RDI: 0000000000000015 [ 65.177985][ C0] RBP: ffffc900000079c8 R08: 0000000000000004 R09: ffff8880ae620f8b [ 65.186295][ C0] R10: 0000000000000000 R11: 6c756e2820202020 R12: dffffc0000000000 [ 65.194251][ C0] R13: ffffffff8c9e74b0 R14: 0000000000000009 R15: 0000000000000001 [ 65.202209][ C0] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 65.211114][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 65.217669][ C0] CR2: 0000000020000dc0 CR3: 0000000094101000 CR4: 00000000001506f0 [ 65.225614][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 65.233582][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 65.241547][ C0] Kernel panic - not syncing: Fatal exception in interrupt [ 65.250058][ C0] Kernel Offset: disabled [ 65.254385][ C0] Rebooting in 86400 seconds..