[ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.19' (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 executing program executing program syzkaller login: [ 65.887868][ C0] [ 65.890255][ C0] ================================ [ 65.895452][ C0] WARNING: inconsistent lock state [ 65.900540][ C0] 5.9.0-rc8-next-20201008-syzkaller #0 Not tainted [ 65.907009][ C0] -------------------------------- [ 65.912093][ C0] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 65.920233][ C0] swapper/0/0 [HC0[0]:SC1[1]:HE0:SE0] takes: [ 65.926345][ C0] ffff888017d8fe18 (&xa->xa_lock#7){+.?.}-{2:2}, at: xa_destroy+0xaa/0x350 [ 65.934955][ C0] {SOFTIRQ-ON-W} state was registered at: [ 65.940665][ C0] lock_acquire+0x1f2/0xaa0 [ 65.945238][ C0] _raw_spin_lock+0x2a/0x40 [ 65.949831][ C0] io_uring_add_task_file+0x207/0x430 [ 65.955383][ C0] io_uring_setup+0x2727/0x3660 [ 65.961714][ C0] do_syscall_64+0x2d/0x70 [ 65.966394][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.972343][ C0] irq event stamp: 121547 [ 65.976657][ C0] hardirqs last enabled at (121546): [] _raw_spin_unlock_irqrestore+0x6f/0x90 [ 65.987346][ C0] hardirqs last disabled at (121547): [] _raw_spin_lock_irqsave+0xa9/0xd0 [ 65.997680][ C0] softirqs last enabled at (121484): [] irq_enter_rcu+0xcf/0xf0 [ 66.007145][ C0] softirqs last disabled at (121485): [] asm_call_irq_on_stack+0xf/0x20 [ 66.017109][ C0] [ 66.017109][ C0] other info that might help us debug this: [ 66.025152][ C0] Possible unsafe locking scenario: [ 66.025152][ C0] [ 66.032590][ C0] CPU0 [ 66.036545][ C0] ---- [ 66.039840][ C0] lock(&xa->xa_lock#7); [ 66.044158][ C0] [ 66.047594][ C0] lock(&xa->xa_lock#7); [ 66.052253][ C0] [ 66.052253][ C0] *** DEADLOCK *** [ 66.052253][ C0] [ 66.060446][ C0] 1 lock held by swapper/0/0: [ 66.065101][ C0] #0: ffffffff8a554c80 (rcu_callback){....}-{0:0}, at: rcu_core+0x5d8/0x1240 [ 66.073981][ C0] [ 66.073981][ C0] stack backtrace: [ 66.079885][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.9.0-rc8-next-20201008-syzkaller #0 [ 66.089257][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.099314][ C0] Call Trace: [ 66.102655][ C0] [ 66.105503][ C0] dump_stack+0x198/0x1fb [ 66.109841][ C0] mark_lock.cold+0x32/0x74 [ 66.114339][ C0] ? lock_chain_count+0x20/0x20 [ 66.119176][ C0] ? mark_lock+0xf7/0x2420 [ 66.123573][ C0] ? lock_chain_count+0x20/0x20 [ 66.128405][ C0] ? is_bpf_text_address+0xcb/0x160 [ 66.133599][ C0] ? start_kernel+0x490/0x4b1 [ 66.138270][ C0] ? start_kernel+0x490/0x4b1 [ 66.142929][ C0] ? kernel_text_address+0xbd/0xf0 [ 66.148020][ C0] ? create_prof_cpu_mask+0x20/0x20 [ 66.153199][ C0] __lock_acquire+0x118a/0x56d0 [ 66.158044][ C0] ? lock_chain_count+0x20/0x20 [ 66.162889][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 66.168862][ C0] lock_acquire+0x1f2/0xaa0 [ 66.173372][ C0] ? xa_destroy+0xaa/0x350 [ 66.177784][ C0] ? lock_release+0x890/0x890 [ 66.182623][ C0] ? _raw_spin_lock_irqsave+0xa9/0xd0 [ 66.188056][ C0] _raw_spin_lock_irqsave+0x94/0xd0 [ 66.193337][ C0] ? xa_destroy+0xaa/0x350 [ 66.197818][ C0] xa_destroy+0xaa/0x350 [ 66.202041][ C0] ? xas_pause+0x3b0/0x3b0 [ 66.206964][ C0] ? lock_acquire+0x1f2/0xaa0 [ 66.211619][ C0] ? lock_release+0x890/0x890 [ 66.216292][ C0] ? free_obj_work+0x5b0/0x5b0 [ 66.221050][ C0] __io_uring_free+0x60/0xc0 [ 66.225648][ C0] __put_task_struct+0xff/0x3f0 [ 66.230476][ C0] delayed_put_task_struct+0x1f6/0x340 [ 66.235912][ C0] rcu_core+0x645/0x1240 [ 66.240132][ C0] ? rcu_gp_kthread+0x1ca0/0x1ca0 [ 66.245158][ C0] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 66.250955][ C0] ? lock_is_held_type+0xbb/0xf0 [ 66.255867][ C0] __do_softirq+0x203/0xab6 [ 66.260433][ C0] asm_call_irq_on_stack+0xf/0x20 [ 66.265566][ C0] [ 66.268537][ C0] do_softirq_own_stack+0x9b/0xd0 [ 66.273627][ C0] irq_exit_rcu+0x235/0x280 [ 66.278111][ C0] sysvec_apic_timer_interrupt+0x51/0xf0 [ 66.283736][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 66.289700][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 66.295052][ C0] 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 [ 66.314832][ C0] RSP: 0018:ffffffff8a207d48 EFLAGS: 00000293 [ 66.320877][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffffffff176a7c1 [ 66.328838][ C0] RDX: ffffffff8a29ce40 RSI: ffffffff8847e5c3 RDI: 0000000000000000 [ 66.336798][ C0] RBP: ffff8881312bc864 R08: 0000000000000001 R09: 0000000000000001 [ 66.344850][ C0] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 [ 66.352906][ C0] R13: ffff8881312bc800 R14: ffff8881312bc864 R15: ffff8881337f2804 [ 66.360880][ C0] ? acpi_idle_do_entry+0x1e3/0x330 [ 66.366054][ C0] acpi_idle_do_entry+0x1e8/0x330 [ 66.371056][ C0] acpi_idle_enter+0x35a/0x550 [ 66.376902][ C0] cpuidle_enter_state+0x1ab/0xdb0 [ 66.382184][ C0] cpuidle_enter+0x4a/0xa0 executing program executing program executing program executing program executing program executing program executing program executing program [ 66.386685][ C0] do_idle+0x48e/0x730 [ 66.391163][ C0] ? arch_cpu_idle_exit+0x70/0x70 [ 66.396627][ C0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 66.403363][ C0] cpu_startup_entry+0x14/0x20 [ 66.408103][ C0] start_kernel+0x490/0x4b1 [ 66.412598][ C0] 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