Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.46' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 68.473130][ T8512] IPVS: ftp: loaded support on port[0] = 21 [ 68.710591][ C0] [ 68.713010][ C0] ================================ [ 68.718129][ C0] WARNING: inconsistent lock state [ 68.723930][ C0] 5.10.0-rc4-syzkaller #0 Not tainted [ 68.729283][ C0] -------------------------------- [ 68.734370][ C0] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 68.741203][ C0] swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 68.747168][ C0] ffff8880125202a8 (&file_data->lock){+.?.}-{2:2}, at: io_file_data_ref_zero+0x75/0x480 [ 68.756899][ C0] {SOFTIRQ-ON-W} state was registered at: [ 68.762608][ C0] lock_acquire+0x2a3/0x8c0 [ 68.767198][ C0] _raw_spin_lock+0x2a/0x40 [ 68.771774][ C0] __do_sys_io_uring_register+0x343a/0x40d0 [ 68.777736][ C0] do_syscall_64+0x2d/0x70 [ 68.782229][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 68.788182][ C0] irq event stamp: 131582 [ 68.792519][ C0] hardirqs last enabled at (131582): [] _raw_spin_unlock_irqrestore+0x42/0x50 [ 68.803023][ C0] hardirqs last disabled at (131581): [] _raw_spin_lock_irqsave+0x4e/0x50 [ 68.813088][ C0] softirqs last enabled at (131566): [] irq_enter_rcu+0xcf/0xf0 [ 68.822377][ C0] softirqs last disabled at (131567): [] asm_call_irq_on_stack+0xf/0x20 [ 68.832243][ C0] [ 68.832243][ C0] other info that might help us debug this: [ 68.840285][ C0] Possible unsafe locking scenario: [ 68.840285][ C0] [ 68.847773][ C0] CPU0 [ 68.851033][ C0] ---- [ 68.854293][ C0] lock(&file_data->lock); [ 68.858795][ C0] [ 68.862224][ C0] lock(&file_data->lock); [ 68.866880][ C0] [ 68.866880][ C0] *** DEADLOCK *** [ 68.866880][ C0] [ 68.875024][ C0] 2 locks held by swapper/0/0: [ 68.879774][ C0] #0: ffffffff8b337700 (rcu_callback){....}-{0:0}, at: rcu_core+0x576/0xe80 [ 68.888544][ C0] #1: ffffffff8b337820 (rcu_read_lock){....}-{1:2}, at: percpu_ref_put_many.constprop.0+0x0/0x250 [ 68.899403][ C0] [ 68.899403][ C0] stack backtrace: [ 68.905295][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-rc4-syzkaller #0 [ 68.913361][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.923502][ C0] Call Trace: [ 68.926769][ C0] [ 68.929625][ C0] dump_stack+0x107/0x163 [ 68.933934][ C0] mark_lock.cold+0x32/0x74 [ 68.938419][ C0] ? lock_chain_count+0x20/0x20 [ 68.943250][ C0] ? mark_lock+0xf7/0x24c0 [ 68.947663][ C0] ? __lock_acquire+0x16c4/0x5c00 [ 68.952671][ C0] ? lock_chain_count+0x20/0x20 [ 68.957520][ C0] ? __lock_acquire+0x16c4/0x5c00 [ 68.962526][ C0] __lock_acquire+0x11b1/0x5c00 [ 68.967362][ C0] ? __lock_acquire+0xbe0/0x5c00 [ 68.972285][ C0] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 68.978260][ C0] lock_acquire+0x2a3/0x8c0 [ 68.982761][ C0] ? io_file_data_ref_zero+0x75/0x480 [ 68.988914][ C0] ? lock_release+0x710/0x710 [ 68.993586][ C0] ? lock_release+0x710/0x710 [ 68.998245][ C0] ? rcu_core+0x576/0xe80 [ 69.003172][ C0] _raw_spin_lock+0x2a/0x40 [ 69.007773][ C0] ? io_file_data_ref_zero+0x75/0x480 [ 69.013135][ C0] io_file_data_ref_zero+0x75/0x480 [ 69.018317][ C0] ? __percpu_ref_exit+0xa7/0x100 [ 69.023323][ C0] ? rcu_core+0x576/0xe80 [ 69.027634][ C0] percpu_ref_put_many.constprop.0+0x217/0x250 [ 69.033771][ C0] rcu_core+0x5df/0xe80 [ 69.037934][ C0] ? rcu_implicit_dynticks_qs+0x990/0x990 [ 69.043652][ C0] __do_softirq+0x2a0/0x9f6 [ 69.048152][ C0] asm_call_irq_on_stack+0xf/0x20 [ 69.053437][ C0] [ 69.056364][ C0] do_softirq_own_stack+0xaa/0xd0 [ 69.061373][ C0] irq_exit_rcu+0x132/0x200 [ 69.065930][ C0] sysvec_apic_timer_interrupt+0x4d/0x100 [ 69.071724][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 69.077688][ C0] RIP: 0010:acpi_idle_do_entry+0x1c9/0x250 [ 69.083494][ C0] Code: 8d 21 88 f8 84 db 75 ac e8 74 29 88 f8 e8 2f e8 8d f8 e9 0c 00 00 00 e8 65 29 88 f8 0f 00 2d 5e 74 c0 00 e8 59 29 88 f8 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 b4 21 88 f8 48 85 db [ 69.103100][ C0] RSP: 0018:ffffffff8b007d60 EFLAGS: 00000293 [ 69.109152][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffffffff19d8ff9 [ 69.117890][ C0] RDX: ffffffff8b09af80 RSI: ffffffff88e80687 RDI: 0000000000000000 [ 69.125848][ C0] RBP: ffff88814141d064 R08: 0000000000000001 R09: 0000000000000001 [ 69.133812][ C0] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 [ 69.141781][ C0] R13: ffff88814141d000 R14: ffff88814141d064 R15: ffff888014984004 [ 69.149752][ C0] ? acpi_idle_do_entry+0x1c7/0x250 [ 69.155089][ C0] acpi_idle_enter+0x361/0x500 [ 69.160129][ C0] cpuid