[ 86.497894][ T27] audit: type=1800 audit(1581159795.201:25): pid=9764 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 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. [ 87.558430][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 87.558441][ T27] audit: type=1800 audit(1581159796.261:29): pid=9764 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 [ 87.585520][ T27] audit: type=1800 audit(1581159796.261:30): pid=9764 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 '10.128.0.165' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 97.966670][ T9917] IPVS: ftp: loaded support on port[0] = 21 [ 98.057082][ C1] [ 98.059438][ C1] ================================ [ 98.064531][ C1] WARNING: inconsistent lock state [ 98.069953][ C1] 5.5.0-syzkaller #0 Not tainted [ 98.074896][ C1] -------------------------------- [ 98.079993][ C1] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 98.087184][ C1] swapper/1/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 98.093184][ C1] ffff8880a519c1c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x6ed/0xc90 [ 98.104230][ C1] {SOFTIRQ-ON-W} state was registered at: [ 98.110284][ C1] lock_acquire+0x190/0x410 [ 98.114899][ C1] _raw_spin_lock+0x2f/0x40 [ 98.119671][ C1] rxrpc_connect_call+0x358/0x4e30 [ 98.124985][ C1] rxrpc_new_client_call+0x9c0/0x1ad0 [ 98.131018][ C1] rxrpc_do_sendmsg+0xffa/0x1d5f [ 98.136213][ C1] rxrpc_sendmsg+0x4d6/0x5f0 [ 98.140890][ C1] sock_sendmsg+0xd7/0x130 [ 98.145435][ C1] ____sys_sendmsg+0x358/0x880 [ 98.150287][ C1] ___sys_sendmsg+0x100/0x170 [ 98.155033][ C1] __sys_sendmmsg+0x1bf/0x4d0 [ 98.160018][ C1] __x64_sys_sendmmsg+0x9d/0x100 [ 98.165247][ C1] do_syscall_64+0xfa/0x790 [ 98.169870][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 98.175874][ C1] irq event stamp: 178440 [ 98.180230][ C1] hardirqs last enabled at (178440): [] _raw_spin_unlock_irqrestore+0x66/0xe0 [ 98.190967][ C1] hardirqs last disabled at (178439): [] _raw_spin_lock_irqsave+0x6f/0xcd [ 98.201027][ C1] softirqs last enabled at (178420): [] _local_bh_enable+0x1c/0x30 [ 98.210644][ C1] softirqs last disabled at (178421): [] irq_exit+0x19b/0x1e0 [ 98.219670][ C1] [ 98.219670][ C1] other info that might help us debug this: [ 98.227717][ C1] Possible unsafe locking scenario: [ 98.227717][ C1] [ 98.235590][ C1] CPU0 [ 98.238863][ C1] ---- [ 98.242155][ C1] lock(&(&local->client_conns_lock)->rlock); [ 98.248444][ C1] [ 98.251890][ C1] lock(&(&local->client_conns_lock)->rlock); [ 98.258197][ C1] [ 98.258197][ C1] *** DEADLOCK *** [ 98.258197][ C1] [ 98.266337][ C1] 1 lock held by swapper/1/0: [ 98.271332][ C1] #0: ffffffff89bac140 (rcu_callback){....}, at: rcu_core+0x562/0x1390 [ 98.279747][ C1] [ 98.279747][ C1] stack backtrace: [ 98.285756][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-syzkaller #0 [ 98.293550][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 98.303620][ C1] Call Trace: [ 98.306952][ C1] [ 98.309819][ C1] dump_stack+0x197/0x210 [ 98.314169][ C1] print_usage_bug.cold+0x327/0x378 [ 98.319360][ C1] mark_lock+0xbb4/0x1220 [ 98.323694][ C1] ? check_usage_backwards+0x330/0x330 [ 98.329849][ C1] __lock_acquire+0x1e8e/0x4a00 [ 98.334718][ C1] ? find_held_lock+0x35/0x130 [ 98.339468][ C1] ? __kasan_check_read+0x11/0x20 [ 98.344487][ C1] ? mark_lock+0xc2/0x1220 [ 98.349159][ C1] ? mark_held_locks+0xf0/0xf0 [ 98.354018][ C1] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 98.360036][ C1] lock_acquire+0x190/0x410 [ 98.364535][ C1] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 98.370251][ C1] _raw_spin_lock+0x2f/0x40 [ 98.374963][ C1] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 98.380420][ C1] rxrpc_put_client_conn+0x6ed/0xc90 [ 98.386432][ C1] ? rxrpc_rcu_destroy_call+0xbd/0x200 [ 98.392334][ C1] rxrpc_rcu_destroy_call+0xbd/0x200 [ 98.397985][ C1] rcu_core+0x5e1/0x1390 [ 98.402386][ C1] ? __rcu_read_unlock+0x700/0x700 [ 98.407495][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 98.413049][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 98.419190][ C1] ? run_rebalance_domains+0x227/0x2d0 [ 98.424686][ C1] rcu_core_si+0x9/0x10 [ 98.428887][ C1] __do_softirq+0x262/0x98c [ 98.433731][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 98.439146][ C1] irq_exit+0x19b/0x1e0 [ 98.443529][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 98.449063][ C1] apic_timer_interrupt+0xf/0x20 [ 98.453987][ C1] [ 98.456923][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 98.462916][ 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 [ 98.482737][ C1] RSP: 0018:ffffc90000d3fd68 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 98.491244][ C1] RAX: 1ffffffff1367612 RBX: ffff8880a99fc340 RCX: 0000000000000000 [ 98.499367][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a99fcbd4 [ 98.507699][ C1] RBP: ffffc90000d3fd98 R08: ffff8880a99fc340 R09: 0000000000000000 [ 98.515786][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 98.523768][ C1] R13: ffffffff8aa52400 R14: 0000000000000000 R15: 0000000000000001 [ 98.531749][ C1] ? default_idle+0x4e/0x360 [ 98.536340][ C1] arch_cpu_idle+0xa/0x10 [ 98.540865][ C1] default_idle_call+0x84/0xb0 [ 98.545740][ C1] do_idle+0x3c8/0x6e0 [ 98.549800][ C1] ? arch_cpu_idle_exit+0x80/0x80 [ 98.554818][ C1] ? _raw_spin_unlock_irqresto