[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ 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 '10.128.0.121' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 58.933031][ C1] [ 58.935547][ C1] ================================ [ 58.940630][ C1] WARNING: inconsistent lock state [ 58.945717][ C1] 5.9.0-rc8-next-20201008-syzkaller #0 Not tainted [ 58.952184][ C1] -------------------------------- [ 58.957265][ C1] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 58.964084][ C1] swapper/1/0 [HC0[0]:SC1[1]:HE0:SE0] takes: [ 58.970032][ C1] ffff88801a4b7418 (&xa->xa_lock#7){+.?.}-{2:2}, at: xa_destroy+0xaa/0x350 [ 58.978611][ C1] {SOFTIRQ-ON-W} state was registered at: [ 58.984306][ C1] lock_acquire+0x1f2/0xaa0 [ 58.988884][ C1] _raw_spin_lock+0x2a/0x40 [ 58.993447][ C1] io_uring_add_task_file+0x207/0x430 [ 58.998877][ C1] io_uring_setup+0x2727/0x3660 [ 59.003785][ C1] do_syscall_64+0x2d/0x70 [ 59.008265][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.014227][ C1] irq event stamp: 127491 [ 59.018532][ C1] hardirqs last enabled at (127490): [] _raw_spin_unlock_irqrestore+0x6f/0x90 [ 59.029102][ C1] hardirqs last disabled at (127491): [] _raw_spin_lock_irqsave+0xa9/0xd0 [ 59.039136][ C1] softirqs last enabled at (127408): [] irq_enter_rcu+0xcf/0xf0 [ 59.048388][ C1] softirqs last disabled at (127409): [] asm_call_irq_on_stack+0xf/0x20 [ 59.058240][ C1] [ 59.058240][ C1] other info that might help us debug this: [ 59.066284][ C1] Possible unsafe locking scenario: [ 59.066284][ C1] [ 59.073704][ C1] CPU0 [ 59.076958][ C1] ---- [ 59.080232][ C1] lock(&xa->xa_lock#7); [ 59.084537][ C1] [ 59.087981][ C1] lock(&xa->xa_lock#7); [ 59.092457][ C1] [ 59.092457][ C1] *** DEADLOCK *** [ 59.092457][ C1] [ 59.100574][ C1] 1 lock held by swapper/1/0: [ 59.105216][ C1] #0: ffffffff8a554c80 (rcu_callback){....}-{0:0}, at: rcu_core+0x5d8/0x1240 [ 59.114160][ C1] [ 59.114160][ C1] stack backtrace: [ 59.120024][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.9.0-rc8-next-20201008-syzkaller #0 [ 59.129113][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.139201][ C1] Call Trace: [ 59.142476][ C1] [ 59.145322][ C1] dump_stack+0x198/0x1fb [ 59.149655][ C1] mark_lock.cold+0x32/0x74 [ 59.154147][ C1] ? lock_chain_count+0x20/0x20 [ 59.159015][ C1] ? mark_lock+0xf7/0x2420 [ 59.163418][ C1] ? get_stack_info_noinstr+0x39/0x110 [ 59.168852][ C1] ? lock_chain_count+0x20/0x20 [ 59.173679][ C1] ? __unwind_start+0x517/0x800 [ 59.178641][ C1] ? create_prof_cpu_mask+0x20/0x20 [ 59.183863][ C1] __lock_acquire+0x118a/0x56d0 [ 59.188708][ C1] ? lock_chain_count+0x20/0x20 [ 59.193537][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 59.199534][ C1] lock_acquire+0x1f2/0xaa0 [ 59.204033][ C1] ? xa_destroy+0xaa/0x350 [ 59.208438][ C1] ? lock_release+0x890/0x890 [ 59.213092][ C1] ? _raw_spin_lock_irqsave+0xa9/0xd0 [ 59.218454][ C1] _raw_spin_lock_irqsave+0x94/0xd0 [ 59.223627][ C1] ? xa_destroy+0xaa/0x350 [ 59.228015][ C1] xa_destroy+0xaa/0x350 [ 59.232228][ C1] ? xas_pause+0x3b0/0x3b0 [ 59.236617][ C1] ? lock_acquire+0x1f2/0xaa0 [ 59.241277][ C1] ? lock_release+0x890/0x890 [ 59.245943][ C1] ? free_obj_work+0x5b0/0x5b0 [ 59.250681][ C1] __io_uring_free+0x60/0xc0 [ 59.255267][ C1] __put_task_struct+0xff/0x3f0 [ 59.260156][ C1] delayed_put_task_struct+0x1f6/0x340 [ 59.265636][ C1] rcu_core+0x645/0x1240 [ 59.269857][ C1] ? rcu_gp_kthread+0x1ca0/0x1ca0 [ 59.274886][ C1] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 59.280684][ C1] ? lock_is_held_type+0xbb/0xf0 [ 59.285598][ C1] __do_softirq+0x203/0xab6 [ 59.290076][ C1] asm_call_irq_on_stack+0xf/0x20 [ 59.295073][ C1] [ 59.297990][ C1] do_softirq_own_stack+0x9b/0xd0 [ 59.302987][ C1] irq_exit_rcu+0x235/0x280 [ 59.307479][ C1] sysvec_apic_timer_interrupt+0x51/0xf0 [ 59.313098][ C1] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 59.319067][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 59.324411][ C1] Code: 89 ef e8 b5 62 6f f9 e9 86 fe ff ff 48 89 df e8 a8 62 6f f9 e9 7b ff ff ff cc cc cc e9 07 00 00 00 0f 00 2d 54 08 61 00 fb f4 90 e9 07 00 00 00 0f 00 2d 44 08 61 00 f4 c3 cc cc 55 53 e8 09 [ 59.344002][ C1] RSP: 0018:ffffc90000d3fd80 EFLAGS: 00000293 [ 59.350048][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffffffff176a7c1 [ 59.358007][ C1] RDX: ffff88800fa96340 RSI: ffffffff8847e5c3 RDI: 0000000000000000 [ 59.365963][ C1] RBP: ffff8881312da864 R08: 0000000000000001 R09: 0000000000000001 [ 59.373923][ C1] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 [ 59.381867][ C1] R13: ffff8881312da800 R14: ffff8881312da864 R15: ffff888132f87804 [ 59.389843][ C1] ? acpi_idle_do_entry+0x1e3/0x330 [ 59.395015][ C1] acpi_idle_do_entry+0x1e8/0x330 [ 59.400025][ C1] acpi_idle_enter+0x35a/0x550 [ 59.404779][ C1] cpuidle_enter_state+0x1ab/0xdb0 [ 59.409864][ C1] cpuidle_enter+0x4a/0xa0 [ 59.414254][ C1] do_idle+0x48e/0x730 [ 59.418299][ C1] ? arch_cpu_idle_exit+0x70/0x70 [ 59.423295][ C1] ? do_idle+0x3d9/0x730 [ 59.427524][ C1] cpu_startup_entry+0x14/0x20 executing program executing program executing program [ 59.432271][ C1] secondary_startup_64_no_verify+0xa6/0xab executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program