[ 96.174318][ T27] audit: type=1800 audit(1581135780.385:27): pid=9970 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 96.247126][ T27] audit: type=1800 audit(1581135780.385:28): pid=9970 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 97.070978][ T27] audit: type=1800 audit(1581135781.325:29): pid=9970 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 97.091980][ T27] audit: type=1800 audit(1581135781.325:30): pid=9970 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.110' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 110.965231][T10124] IPVS: ftp: loaded support on port[0] = 21 [ 111.054631][ C1] [ 111.056994][ C1] ================================ [ 111.062129][ C1] WARNING: inconsistent lock state [ 111.067292][ C1] 5.5.0-syzkaller #0 Not tainted [ 111.072212][ C1] -------------------------------- [ 111.077334][ C1] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 111.084297][ C1] swapper/1/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 111.090397][ C1] ffff88809fc8c1c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x6ed/0xc90 [ 111.101573][ C1] {SOFTIRQ-ON-W} state was registered at: [ 111.107292][ C1] lock_acquire+0x190/0x410 [ 111.111893][ C1] _raw_spin_lock+0x2f/0x40 [ 111.116472][ C1] rxrpc_connect_call+0x358/0x4e30 [ 111.121675][ C1] rxrpc_new_client_call+0x9c0/0x1ad0 [ 111.127202][ C1] rxrpc_do_sendmsg+0xffa/0x1d5f [ 111.132863][ C1] rxrpc_sendmsg+0x4d6/0x5f0 [ 111.137783][ C1] sock_sendmsg+0xd7/0x130 [ 111.142286][ C1] ____sys_sendmsg+0x358/0x880 [ 111.147370][ C1] ___sys_sendmsg+0x100/0x170 [ 111.152167][ C1] __sys_sendmmsg+0x1bf/0x4d0 [ 111.156921][ C1] __x64_sys_sendmmsg+0x9d/0x100 [ 111.162049][ C1] do_syscall_64+0xfa/0x790 [ 111.166633][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 111.172589][ C1] irq event stamp: 157338 [ 111.176909][ C1] hardirqs last enabled at (157338): [] _raw_spin_unlock_irqrestore+0x66/0xe0 [ 111.187481][ C1] hardirqs last disabled at (157337): [] _raw_spin_lock_irqsave+0x6f/0xcd [ 111.197520][ C1] softirqs last enabled at (157258): [] _local_bh_enable+0x1c/0x30 [ 111.207108][ C1] softirqs last disabled at (157259): [] irq_exit+0x19b/0x1e0 [ 111.216111][ C1] [ 111.216111][ C1] other info that might help us debug this: [ 111.224696][ C1] Possible unsafe locking scenario: [ 111.224696][ C1] [ 111.232483][ C1] CPU0 [ 111.235773][ C1] ---- [ 111.239576][ C1] lock(&(&local->client_conns_lock)->rlock); [ 111.245704][ C1] [ 111.249150][ C1] lock(&(&local->client_conns_lock)->rlock); [ 111.255676][ C1] [ 111.255676][ C1] *** DEADLOCK *** [ 111.255676][ C1] [ 111.263941][ C1] 1 lock held by swapper/1/0: [ 111.268610][ C1] #0: ffffffff89bac140 (rcu_callback){....}, at: rcu_core+0x562/0x1390 [ 111.276945][ C1] [ 111.276945][ C1] stack backtrace: [ 111.282816][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-syzkaller #0 [ 111.290343][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 111.300527][ C1] Call Trace: [ 111.303855][ C1] [ 111.306702][ C1] dump_stack+0x197/0x210 [ 111.311023][ C1] print_usage_bug.cold+0x327/0x378 [ 111.316209][ C1] mark_lock+0xbb4/0x1220 [ 111.320822][ C1] ? kfree+0x10a/0x2c0 [ 111.324938][ C1] ? check_usage_backwards+0x330/0x330 [ 111.330383][ C1] ? __nf_hook_entries_free+0x31/0x40 [ 111.335960][ C1] __lock_acquire+0x1e8e/0x4a00 [ 111.340803][ C1] ? find_held_lock+0x35/0x130 [ 111.345554][ C1] ? __kasan_check_read+0x11/0x20 [ 111.350557][ C1] ? mark_lock+0xc2/0x1220 [ 111.354967][ C1] ? mark_held_locks+0xf0/0xf0 [ 111.359790][ C1] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 111.365887][ C1] lock_acquire+0x190/0x410 [ 111.370399][ C1] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 111.375980][ C1] _raw_spin_lock+0x2f/0x40 [ 111.380582][ C1] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 111.386132][ C1] rxrpc_put_client_conn+0x6ed/0xc90 [ 111.391590][ C1] ? rxrpc_rcu_destroy_call+0xbd/0x200 [ 111.397057][ C1] rxrpc_rcu_destroy_call+0xbd/0x200 [ 111.402336][ C1] rcu_core+0x5e1/0x1390 [ 111.406833][ C1] ? __rcu_read_unlock+0x700/0x700 [ 111.411957][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 111.417485][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 111.423445][ C1] ? run_rebalance_domains+0x227/0x2d0 [ 111.428882][ C1] rcu_core_si+0x9/0x10 [ 111.433027][ C1] __do_softirq+0x262/0x98c [ 111.437512][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 111.442359][ C1] irq_exit+0x19b/0x1e0 [ 111.446506][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 111.452056][ C1] apic_timer_interrupt+0xf/0x20 [ 111.456974][ C1] [ 111.459903][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 111.465275][ C1] Code: 48 70 c7 f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 44 d3 5b 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 34 d3 5b 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 7e 2f 76 f9 e8 19 [ 111.484969][ C1] RSP: 0018:ffffc90000d3fd68 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 111.493372][ C1] RAX: 1ffffffff1367612 RBX: ffff8880a99fc340 RCX: 0000000000000000 [ 111.501333][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a99fcbd4 [ 111.509286][ C1] RBP: ffffc90000d3fd98 R08: ffff8880a99fc340 R09: 0000000000000000 [ 111.517324][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 111.525337][ C1] R13: ffffffff8aa52400 R14: 0000000000000000 R15: 0000000000000001 [ 111.533368][ C1] ? default_idle+0x4e/0x360 [ 111.537957][ C1] arch_cpu_idle+0xa/0x10 [ 111.543050][ C1] default_idle_call+0x84/0xb0 [ 111.547808][ C1] do_idle+0x3c8/0x6e0 [ 111.551857][ C1] ? arch_cpu_idle_exit+0x80/0x80 [