[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.212' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program syzkaller login: [ 406.504222][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 406.511041][ C0] rcu: 0-...!: (10500 ticks this GP) idle=e69/1/0x4000000000000000 softirq=9160/9160 fqs=3 [ 406.521408][ C0] (t=10502 jiffies g=11457 q=19) [ 406.526613][ C0] rcu: rcu_preempt kthread starved for 10496 jiffies! g11457 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 406.537813][ C0] rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. [ 406.547774][ C0] rcu: RCU grace-period kthread stack dump: [ 406.553738][ C0] task:rcu_preempt state:R running task stack:27528 pid: 14 ppid: 2 flags:0x00004000 [ 406.564515][ C0] Call Trace: [ 406.567792][ C0] [ 406.570733][ C0] __schedule+0xa9a/0x4940 [ 406.575390][ C0] ? lockdep_hardirqs_on+0x79/0x100 [ 406.580595][ C0] ? _raw_spin_unlock_irqrestore+0x3d/0x70 [ 406.586436][ C0] ? io_schedule_timeout+0x180/0x180 [ 406.591736][ C0] ? debug_object_destroy+0x210/0x210 [ 406.597161][ C0] schedule+0xd2/0x260 [ 406.601352][ C0] schedule_timeout+0x14a/0x2a0 [ 406.606214][ C0] ? usleep_range+0x170/0x170 [ 406.610896][ C0] ? destroy_timer_on_stack+0x20/0x20 [ 406.616519][ C0] ? ncsi_cmd_handler_sma+0xd0/0x210 [ 406.621902][ C0] ? _raw_spin_unlock_irqrestore+0x3d/0x70 [ 406.627718][ C0] ? prepare_to_swait_event+0xee/0x470 [ 406.633215][ C0] rcu_gp_fqs_loop+0x186/0x810 [ 406.638017][ C0] ? force_qs_rnp+0x760/0x760 [ 406.642703][ C0] ? rcu_gp_init+0x90b/0x12a0 [ 406.647406][ C0] rcu_gp_kthread+0x1de/0x320 [ 406.652093][ C0] ? rcu_gp_init+0x12a0/0x12a0 [ 406.656868][ C0] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 406.663181][ C0] ? __kthread_parkme+0x15f/0x220 [ 406.668270][ C0] ? rcu_gp_init+0x12a0/0x12a0 [ 406.673046][ C0] kthread+0x405/0x4f0 [ 406.677129][ C0] ? set_kthread_struct+0x130/0x130 [ 406.682338][ C0] ret_from_fork+0x1f/0x30 [ 406.686819][ C0] [ 406.689837][ C0] rcu: Stack dump where RCU GP kthread last ran: [ 406.696151][ C0] Sending NMI from CPU 0 to CPUs 1: [ 406.701362][ C1] NMI backtrace for cpu 1 [ 406.701373][ C1] CPU: 1 PID: 6588 Comm: iou-wrk-6583 Not tainted 5.15.0-rc7-next-20211026-syzkaller #0 [ 406.701394][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 406.701405][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x60 [ 406.701435][ C1] Code: 00 00 e9 d6 2b 61 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 89 be 8a 7e 89 c1 48 8b 34 24 <81> e1 00 01 00 00 65 48 8b 14 25 40 70 02 00 a9 00 01 ff 00 74 0e [ 406.701453][ C1] RSP: 0018:ffffc900027df590 EFLAGS: 00000206 [ 406.701469][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 406.701481][ C1] RDX: 0000000000000000 RSI: ffffffff890d8264 RDI: 0000000000000003 [ 406.701493][ C1] RBP: ffff88806b000000 R08: 0000000000003fff R09: 0000000000000000 [ 406.701506][ C1] R10: ffffffff890d8256 R11: 0000000000000000 R12: 000000001445b314 [ 406.701518][ C1] R13: dffffc0000000000 R14: ffff888015e58000 R15: ffff88801c84bde0 [ 406.701532][ C1] FS: 00005555556bf300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 406.701549][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 406.701562][ C1] CR2: 00007fe311c06053 CR3: 0000000021ae4000 CR4: 00000000003506e0 [ 406.701575][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 406.701586][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 406.701598][ C1] Call Trace: [ 406.701604][ C1] [ 406.701609][ C1] io_uring_show_fdinfo+0x3a1/0x1372 [ 406.701673][ C1] ? show_fd_locks+0x11b/0x170 [ 406.701732][ C1] ? io_uring_drop_tctx_refs+0x153/0x153 [ 406.701754][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 406.701800][ C1] ? io_uring_drop_tctx_refs+0x153/0x153 [ 406.701824][ C1] seq_show+0x58d/0x800 [ 406.701873][ C1] seq_read_iter+0x4f6/0x1240 [ 406.701918][ C1] seq_read+0x3e0/0x5b0 [ 406.701939][ C1] ? seq_read_iter+0x1240/0x1240 [ 406.701970][ C1] ? seq_read_iter+0x1240/0x1240 [ 406.701990][ C1] loop_rw_iter+0x12d/0x530 [ 406.702031][ C1] io_read+0xce6/0xff0 [ 406.702071][ C1] ? lock_chain_count+0x20/0x20 [ 406.702093][ C1] ? kiocb_done+0xb90/0xb90 [ 406.702115][ C1] ? register_lock_class+0xb7/0x10c0 [ 406.702138][ C1] ? mark_lock+0xef/0x17b0 [ 406.702164][ C1] ? is_dynamic_key+0x1a0/0x1a0 [ 406.702185][ C1] ? mark_lock+0xef/0x17b0 [ 406.702205][ C1] ? lock_chain_count+0x20/0x20 [ 406.702229][ C1] ? __lock_acquire+0x162f/0x54a0 [ 406.702255][ C1] io_issue_sqe+0x800/0x7010 [ 406.702284][ C1] ? io_openat2+0xb50/0xb50 [ 406.702306][ C1] ? find_held_lock+0x2d/0x110 [ 406.702328][ C1] ? io_worker_handle_work+0x47b/0x16f0 [ 406.702347][ C1] ? lock_downgrade+0x6e0/0x6e0 [ 406.702369][ C1] ? do_raw_spin_lock+0x120/0x2b0 [ 406.702392][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 406.702416][ C1] io_wq_submit_work+0x1db/0x580 [ 406.702442][ C1] io_worker_handle_work+0x97a/0x16f0 [ 406.702469][ C1] io_wqe_worker+0x55e/0xc20 [ 406.702491][ C1] ? io_worker_handle_work+0x16f0/0x16f0 [ 406.702512][ C1] ? ret_from_fork+0x8/0x30 [ 406.702534][ C1] ? lock_downgrade+0x6e0/0x6e0 [ 406.702554][ C1] ? do_raw_spin_lock+0x120/0x2b0 [ 406.702577][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 406.702601][ C1] ? _raw_spin_unlock_irq+0x1f/0x40 [ 406.702624][ C1] ? io_worker_handle_work+0x16f0/0x16f0 [ 406.702644][ C1] ret_from_fork+0x1f/0x30 [ 406.702672][ C1] [ 406.702679][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.316 msecs [ 406.703359][ C0] NMI backtrace for cpu 0 [ 407.047483][ C0] CPU: 0 PID: 6581 Comm: iou-wrk-6574 Not tainted 5.15.0-rc7-next-20211026-syzkaller #0 [ 407.057204][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 407.067265][ C0] Call Trace: [ 407.070550][ C0] [ 407.073392][ C0] dump_stack_lvl+0xcd/0x134 [ 407.078138][ C0] nmi_cpu_backtrace.cold+0x47/0x144 [ 407.083432][ C0] ? lapic_can_unplug_cpu+0x80/0x80 [ 407.088638][ C0] nmi_trigger_cpumask_backtrace+0x1ae/0x220 [ 407.094677][ C0] rcu_dump_cpu_stacks+0x25e/0x3f0 [ 407.099811][ C0] rcu_sched_clock_irq.cold+0x9d/0x746 [ 407.105306][ C0] ? find_held_lock+0x2d/0x110 [ 407.110106][ C0] ? rcutree_dead_cpu+0x30/0x30 [ 407.114998][ C0] ? tick_sched_timer+0x2b/0x2d0 [ 407.120037][ C0] ? lock_downgrade+0x6e0/0x6e0 [ 407.124927][ C0] update_process_times+0x16d/0x200 [ 407.130159][ C0] tick_sched_handle+0x9b/0x180 [ 407.135057][ C0] tick_sched_timer+0x1b0/0x2d0 [ 407.139936][ C0] ? get_cpu_iowait_time_us+0x3f0/0x3f0 [ 407.145498][ C0] __hrtimer_run_queues+0x1c0/0xe50 [ 407.150723][ C0] ? hrtimer_sleeper_start_expires+0x80/0x80 [ 407.156715][ C0] ? ktime_get_update_offsets_now+0x3eb/0x5c0 [ 407.162888][ C0] hrtimer_interrupt+0x31c/0x790 [ 407.167845][ C0] __sysvec_apic_timer_interrupt+0x146/0x530 [ 407.173835][ C0] sysvec_apic_timer_interrupt+0x8e/0xc0 [ 407.179565][ C0] [ 407.182492][ C0] [ 407.185594][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 407.191651][ C0] RIP: 0010:io_uring_show_fdinfo+0x3fb/0x1372 [ 407.197725][ C0] Code: fa 48 c1 ea 03 42 80 3c 2a 00 74 05 e8 1b dd b0 f8 48 8d 7d 01 48 8b 45 20 48 89 fa 48 89 f9 48 c1 ea 03 83 e1 07 42 8a 14 2a <48> 89 44 24 30 38 ca 7f 09 84 d2 74 05 e8 c0 dc b0 f8 48 8d 7d 04 [ 407.217335][ C0] RSP: 0018:ffffc90001f6f598 EFLAGS: 00000202 [ 407.223404][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 407.231373][ C0] RDX: 1ffff1100d800000 RSI: ffffffff890d8264 RDI: ffff88806c000001 [ 407.239347][ C0] RBP: ffff88806c000000 R08: 0000000000003fff R09: 0000000000000000 [ 407.247764][ C0] R10: ffffffff890d8256 R11: 0000000000000000 R12: 000000001426b56e [ 407.255736][ C0] R13: dffffc0000000000 R14: ffff888015d0b000 R15: ffff88801afd8cb8 [ 407.263890][ C0] ? io_uring_show_fdinfo+0x393/0x1372 [ 407.269366][ C0] ? io_uring_show_fdinfo+0x3a1/0x1372 [ 407.274838][ C0] ? io_uring_show_fdinfo+0x3a1/0x1372 [ 407.280313][ C0] ? show_fd_locks+0x11b/0x170 [ 407.285084][ C0] ? io_uring_drop_tctx_refs+0x153/0x153 [ 407.290723][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 407.295677][ C0] ? io_uring_drop_tctx_refs+0x153/0x153 [ 407.301323][ C0] seq_show+0x58d/0x800 [ 407.305494][ C0] seq_read_iter+0x4f6/0x1240 [ 407.310201][ C0] seq_read+0x3e0/0x5b0 [ 407.314469][ C0] ? seq_read_iter+0x1240/0x1240 [ 407.319439][ C0] ? arch_stack_walk+0x7d/0xe0 [ 407.324271][ C0] ? ret_from_fork+0x1f/0x30 [ 407.328898][ C0] ? filter_irq_stacks+0x90/0x90 [ 407.333851][ C0] ? __free_zapped_classes+0x320/0x320 [ 407.339340][ C0] ? seq_read_iter+0x1240/0x1240 [ 407.344307][ C0] loop_rw_iter+0x12d/0x530 [ 407.349021][ C0] io_read+0xce6/0xff0 [ 407.353122][ C0] ? lock_chain_count+0x20/0x20 [ 407.357991][ C0] ? kiocb_done+0xb90/0xb90 [ 407.362518][ C0] ? register_lock_class+0x37f/0x10c0 [ 407.367929][ C0] ? lockdep_lock+0xc6/0x200 [ 407.372543][ C0] ? call_rcu_zapped+0xb0/0xb0 [ 407.377337][ C0] ? lockdep_unlock+0x11c/0x290 [ 407.382220][ C0] ? __lock_acquire+0x24ca/0x54a0 [ 407.387285][ C0] io_issue_sqe+0x800/0x7010 [ 407.391914][ C0] ? io_openat2+0xb50/0xb50 [ 407.396433][ C0] ? find_held_lock+0x2d/0x110 [ 407.401214][ C0] ? io_worker_handle_work+0x47b/0x16f0 [ 407.406768][ C0] ? lock_downgrade+0x6e0/0x6e0 [ 407.411632][ C0] ? do_raw_spin_lock+0x120/0x2b0 [ 407.416678][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 407.421633][ C0] io_wq_submit_work+0x1db/0x580 [ 407.426684][ C0] io_worker_handle_work+0x97a/0x16f0 [ 407.432086][ C0] io_wqe_worker+0x55e/0xc20 [ 407.436700][ C0] ? io_worker_handle_work+0x16f0/0x16f0 [ 407.442363][ C0] ? ret_from_fork+0x8/0x30 [ 407.446877][ C0] ? lock_downgrade+0x6e0/0x6e0 [ 407.451741][ C0] ? do_raw_spin_lock+0x120/0x2b0 [ 407.456783][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 407.461735][ C0] ? _raw_spin_unlock_irq+0x1f/0x40 [ 407.466944][ C0] ? io_worker_handle_work+0x16f0/0x16f0 [ 407.472583][ C0] ret_from_fork+0x1f/0x30 [ 407.477027][ C0]