[ 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 '10.128.0.24' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.072840][ C1] [ 69.075206][ C1] ======================================================== [ 69.082383][ C1] WARNING: possible irq lock inversion dependency detected [ 69.089549][ C1] 5.9.0-rc4-next-20200911-syzkaller #0 Not tainted [ 69.096112][ C1] -------------------------------------------------------- [ 69.103422][ C1] swapper/1/0 just changed the state of lock: [ 69.109453][ C1] ffff888215399108 (&group->lock){..-.}-{2:2}, at: _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 69.119337][ C1] but this lock took another, SOFTIRQ-READ-unsafe lock in the past: [ 69.127278][ C1] (&card->ctl_files_rwlock){.+.+}-{2:2} [ 69.127292][ C1] [ 69.127292][ C1] [ 69.127292][ C1] and interrupts could create inverse lock ordering between them. [ 69.127292][ C1] [ 69.148132][ C1] [ 69.148132][ C1] other info that might help us debug this: [ 69.156161][ C1] Possible interrupt unsafe locking scenario: [ 69.156161][ C1] [ 69.164453][ C1] CPU0 CPU1 [ 69.169790][ C1] ---- ---- [ 69.175307][ C1] lock(&card->ctl_files_rwlock); [ 69.180389][ C1] local_irq_disable(); [ 69.188068][ C1] lock(&group->lock); [ 69.194714][ C1] lock(&card->ctl_files_rwlock); [ 69.202670][ C1] [ 69.206094][ C1] lock(&group->lock); [ 69.210664][ C1] [ 69.210664][ C1] *** DEADLOCK *** [ 69.210664][ C1] [ 69.218887][ C1] 1 lock held by swapper/1/0: [ 69.223529][ C1] #0: ffffc90000da8d80 ((&dpcm->timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x6b0 [ 69.232809][ C1] [ 69.232809][ C1] the shortest dependencies between 2nd lock and 1st lock: [ 69.243216][ C1] -> (&card->ctl_files_rwlock){.+.+}-{2:2} { [ 69.249269][ C1] HARDIRQ-ON-R at: [ 69.253944][ C1] lock_acquire+0x1f2/0xaa0 [ 69.260260][ C1] _raw_read_lock+0x5b/0x70 [ 69.266560][ C1] snd_ctl_notify.part.0+0x36/0x550 [ 69.273553][ C1] snd_ctl_notify+0x8f/0xb0 [ 69.279898][ C1] __snd_ctl_add_replace+0x638/0x800 [ 69.286991][ C1] snd_ctl_add_replace+0x76/0x130 [ 69.293815][ C1] snd_dummy_probe+0xbbf/0x1050 [ 69.300530][ C1] platform_drv_probe+0x87/0x140 [ 69.307465][ C1] really_probe+0x282/0x9f0 [ 69.313817][ C1] driver_probe_device+0xfe/0x1d0 [ 69.320653][ C1] __device_attach_driver+0x1c2/0x220 [ 69.327821][ C1] bus_for_each_drv+0x15f/0x1e0 [ 69.334464][ C1] __device_attach+0x228/0x470 [ 69.341035][ C1] bus_probe_device+0x1e4/0x290 [ 69.347691][ C1] device_add+0xb17/0x1c40 [ 69.353911][ C1] platform_device_add+0x34f/0x6d0 [ 69.360818][ C1] platform_device_register_full+0x38c/0x4e0 [ 69.368695][ C1] alsa_card_dummy_init+0x1cc/0x2e0 [ 69.375710][ C1] do_one_initcall+0x103/0x6f0 [ 69.382622][ C1] kernel_init_freeable+0x5e9/0x66d [ 69.389614][ C1] kernel_init+0xd/0x1c0 [ 69.396628][ C1] ret_from_fork+0x1f/0x30 [ 69.403105][ C1] SOFTIRQ-ON-R at: [ 69.407673][ C1] lock_acquire+0x1f2/0xaa0 [ 69.413974][ C1] _raw_read_lock+0x5b/0x70 [ 69.420272][ C1] snd_ctl_notify.part.0+0x36/0x550 [ 69.427264][ C1] snd_ctl_notify+0x8f/0xb0 [ 69.433562][ C1] __snd_ctl_add_replace+0x638/0x800 [ 69.440660][ C1] snd_ctl_add_replace+0x76/0x130 [ 69.448980][ C1] snd_dummy_probe+0xbbf/0x1050 [ 69.455633][ C1] platform_drv_probe+0x87/0x140 [ 69.462368][ C1] really_probe+0x282/0x9f0 [ 69.468755][ C1] driver_probe_device+0xfe/0x1d0 [ 69.476019][ C1] __device_attach_driver+0x1c2/0x220 [ 69.483193][ C1] bus_for_each_drv+0x15f/0x1e0 [ 69.489836][ C1] __device_attach+0x228/0x470 [ 69.496391][ C1] bus_probe_device+0x1e4/0x290 [ 69.503043][ C1] device_add+0xb17/0x1c40 [ 69.509287][ C1] platform_device_add+0x34f/0x6d0 [ 69.516200][ C1] platform_device_register_full+0x38c/0x4e0 [ 69.523983][ C1] alsa_card_dummy_init+0x1cc/0x2e0 [ 69.530986][ C1] do_one_initcall+0x103/0x6f0 [ 69.537554][ C1] kernel_init_freeable+0x5e9/0x66d [ 69.544553][ C1] kernel_init+0xd/0x1c0 [ 69.551379][ C1] ret_from_fork+0x1f/0x30 [ 69.557595][ C1] (null) at: [ 69.561136][ C1] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN [ 69.572823][ C1] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] [ 69.581214][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.9.0-rc4-next-20200911-syzkaller #0 [ 69.590284][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.600317][ C1] RIP: 0010:print_shortest_lock_dependencies.cold+0x110/0x2af [ 69.607828][ 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 [ 69.627491][ C1] RSP: 0018:ffffc90000da8898 EFLAGS: 00010003 [ 69.633528][ C1] RAX: 0000000000000001 RBX: ffffffff8cbddac0 RCX: 0000000000000000 [ 69.641565][ C1] RDX: 0000000000000002 RSI: ffffffff815c0ec7 RDI: 0000000000000015 [ 69.649517][ C1] RBP: ffffc90000da89c8 R08: 0000000000000004 R09: ffff8880ae720f8b [ 69.657459][ C1] R10: 0000000000000000 R11: 6c756e2820202020 R12: dffffc0000000000 [ 69.665411][ C1] R13: ffffffff8c9e7568 R14: 0000000000000009 R15: 0000000000000001 [ 69.673362][ C1] FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 69.682261][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.688820][ C1] CR2: 0000000020000dc0 CR3: 0000000009c8e000 CR4: 00000000001506e0 [ 69.696769][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 69.704712][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 69.712653][ C1] Call Trace: [ 69.715921][ C1] [ 69.718776][ C1] print_irq_inversion_bug.part.0+0x2c6/0x2ee [ 69.724814][ C1] mark_lock.cold+0x38/0x10d [ 69.729376][ C1] ? lock_chain_count+0x20/0x20 [ 69.734204][ C1] ? lock_is_held_type+0xbb/0xf0 [ 69.739124][ C1] ? find_held_lock+0x2d/0x110 [ 69.743859][ C1] ? debug_object_activate+0x287/0x3e0 [ 69.749291][ C1] ? lock_downgrade+0x830/0x830 [ 69.754114][ C1] __lock_acquire+0x117d/0x55d0 [ 69.758946][ C1] ? lock_downgrade+0x830/0x830 [ 69.763767][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 69.769716][ C1] ? mark_lock+0xf7/0x2300 [ 69.774103][ C1] lock_acquire+0x1f2/0xaa0 [ 69.778582][ C1] ? _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 69.784544][ C1] ? lock_release+0x890/0x890 [ 69.789200][ C1] ? find_held_lock+0x2d/0x110 [ 69.793957][ C1] ? loopback_jiffies_timer_function+0x188/0x220 [ 69.800265][ C1] ? _raw_spin_lock_irqsave+0xa9/0xd0 [ 69.805608][ C1] _raw_spin_lock_irqsave+0x94/0xd0 [ 69.810863][ C1] ? _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 69.816728][ C1] _snd_pcm_stream_lock_irqsave+0x9f/0xd0 [ 69.822435][ C1] snd_pcm_period_elapsed+0x24/0x250 [ 69.827742][ C1] loopback_jiffies_timer_function+0x1a8/0x220 [ 69.833888][ C1] ? loopback_jiffies_timer_pos_update+0xf60/0xf60 [ 69.840359][ C1] call_timer_fn+0x1a5/0x6b0 [ 69.844920][ C1] ? add_timer_on+0x450/0x450 [ 69.849573][ C1] ? lock_downgrade+0x830/0x830 [ 69.854499][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 69.859418][ C1] ? _raw_spin_unlock_irq+0x1f/0x80 [ 69.864601][ C1] ? loopback_jiffies_timer_pos_update+0xf60/0xf60 [ 69.871088][ C1] __run_timers.part.0+0x67c/0xa50 [ 69.876217][ C1] ? call_timer_fn+0x6b0/0x6b0 [ 69.880962][ C1] ? lapic_next_event+0x4d/0x80 [ 69.885803][ C1] ? clockevents_program_event+0x12b/0x350 [ 69.891602][ C1] ? kvm_sched_clock_read+0x14/0x40 [ 69.896782][ C1] ? sched_clock+0x2a/0x40 [ 69.901170][ C1] ? sched_clock_cpu+0x18/0x1b0 [ 69.906000][ C1] ? hrtimer_interrupt+0x6ea/0x930 [ 69.911085][ C1] run_timer_softirq+0xae/0x1a0 [ 69.915921][ C1] __do_softirq+0x202/0xa42 [ 69.920397][ C1] asm_call_on_stack+0xf/0x20 [ 69.925052][ C1] [ 69.927964][ C1] do_softirq_own_stack+0x9d/0xd0 [ 69.932975][ C1] irq_exit_rcu+0x235/0x280 [ 69.937471][ C1] sysvec_apic_timer_interrupt+0x51/0xf0 [ 69.943104][ C1] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 69.949078][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 69.954433][ 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 [ 69.974008][ C1] RSP: 0018:ffffc90000d3fd10 EFLAGS: 00000293 [ 69.980045][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffffffff15cacb9 [ 69.988097][ C1] RDX: ffff8880a9630340 RSI: ffffffff88034020 RDI: 0000000000000000 [ 69.996059][ C1] RBP: ffff8880a6257864 R08: 0000000000000001 R09: 0000000000000001 [ 70.004020][ C1] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880a6257864 [ 70.011966][ C1] R13: 1ffff920001a7fac R14: ffff8880a6257865 R15: 0000000000000001 [ 70.019925][ C1] ? acpi_safe_halt+0x90/0x180 [ 70.024678][ C1] acpi_safe_halt+0x95/0x180 [ 70.029412][ C1] acpi_idle_do_entry+0x15c/0x1b0 [ 70.034520][ C1] acpi_idle_enter+0x403/0xac0 [ 70.039263][ C1] ? acpi_idle_enter_bm+0x2d0/0x2d0 [ 70.044437][ C1] cpuidle_enter_state+0x150/0xa70 [ 70.049533][ C1] ? tick_nohz_idle_stop_tick+0x504/0xbc0 [ 70.055246][ C1] cpuidle_enter+0x4a/0xa0 [ 70.059648][ C1] do_idle+0x48e/0x730 [ 70.063688][ C1] ? arch_cpu_idle_exit+0x70/0x70 [ 70.068714][ C1] cpu_startup_entry+0x14/0x20 [ 70.073462][ C1] secondary_startup_64_no_verify+0xa6/0xab [ 70.079320][ C1] Modules linked in: [ 70.083206][ C1] ---[ end trace 28ff76e39faf679b ]--- [ 70.088727][ C1] RIP: 0010:print_shortest_lock_dependencies.cold+0x110/0x2af [ 70.096327][ 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 [ 70.115911][ C1] RSP: 0018:ffffc90000da8898 EFLAGS: 00010003 [ 70.122013][ C1] RAX: 0000000000000001 RBX: ffffffff8cbddac0 RCX: 0000000000000000 [ 70.129983][ C1] RDX: 0000000000000002 RSI: ffffffff815c0ec7 RDI: 0000000000000015 [ 70.137981][ C1] RBP: ffffc90000da89c8 R08: 0000000000000004 R09: ffff8880ae720f8b [ 70.145932][ C1] R10: 0000000000000000 R11: 6c756e2820202020 R12: dffffc0000000000 [ 70.154088][ C1] R13: ffffffff8c9e7568 R14: 0000000000000009 R15: 0000000000000001 [ 70.162153][ C1] FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 70.171057][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 70.177613][ C1] CR2: 0000000020000dc0 CR3: 0000000009c8e000 CR4: 00000000001506e0 [ 70.186616][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 70.194996][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 70.202942][ C1] Kernel panic - not syncing: Fatal exception in interrupt [ 70.211501][ C1] Kernel Offset: disabled [ 70.215819][ C1] Rebooting in 86400 seconds..