[ 95.451160][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 95.451172][ T27] audit: type=1800 audit(1581077364.055:28): pid=9767 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. [ 96.453637][ T27] audit: type=1800 audit(1581077365.055:29): pid=9767 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 [ 96.473981][ T27] audit: type=1800 audit(1581077365.055:30): pid=9767 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 '10.128.0.191' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 104.937895][ T9919] IPVS: ftp: loaded support on port[0] = 21 [ 104.999571][ C1] [ 105.001949][ C1] ================================ [ 105.008246][ C1] WARNING: inconsistent lock state [ 105.015433][ C1] 5.5.0-syzkaller #0 Not tainted [ 105.021558][ C1] -------------------------------- [ 105.027019][ C1] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 105.035738][ C1] swapper/1/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 105.042457][ C1] ffff8880977c09c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x6ed/0xc90 [ 105.056481][ C1] {SOFTIRQ-ON-W} state was registered at: [ 105.063546][ C1] lock_acquire+0x190/0x410 [ 105.068598][ C1] _raw_spin_lock+0x2f/0x40 [ 105.073720][ C1] rxrpc_connect_call+0x358/0x4e30 [ 105.079858][ C1] rxrpc_new_client_call+0x9c0/0x1ad0 [ 105.087338][ C1] rxrpc_do_sendmsg+0xffa/0x1d5f [ 105.093836][ C1] rxrpc_sendmsg+0x4d6/0x5f0 [ 105.099339][ C1] sock_sendmsg+0xd7/0x130 [ 105.104810][ C1] ____sys_sendmsg+0x358/0x880 [ 105.109982][ C1] ___sys_sendmsg+0x100/0x170 [ 105.114946][ C1] __sys_sendmmsg+0x1bf/0x4d0 [ 105.120022][ C1] __x64_sys_sendmmsg+0x9d/0x100 [ 105.125601][ C1] do_syscall_64+0xfa/0x790 [ 105.130625][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 105.136999][ C1] irq event stamp: 168066 [ 105.141868][ C1] hardirqs last enabled at (168066): [] _raw_spin_unlock_irqrestore+0x66/0xe0 [ 105.154368][ C1] hardirqs last disabled at (168065): [] _raw_spin_lock_irqsave+0x6f/0xcd [ 105.167485][ C1] softirqs last enabled at (167960): [] _local_bh_enable+0x1c/0x30 [ 105.180057][ C1] softirqs last disabled at (167961): [] irq_exit+0x19b/0x1e0 [ 105.190885][ C1] [ 105.190885][ C1] other info that might help us debug this: [ 105.200243][ C1] Possible unsafe locking scenario: [ 105.200243][ C1] [ 105.209346][ C1] CPU0 [ 105.214167][ C1] ---- [ 105.218177][ C1] lock(&(&local->client_conns_lock)->rlock); [ 105.226002][ C1] [ 105.231793][ C1] lock(&(&local->client_conns_lock)->rlock); [ 105.240163][ C1] [ 105.240163][ C1] *** DEADLOCK *** [ 105.240163][ C1] [ 105.249476][ C1] 1 lock held by swapper/1/0: [ 105.254864][ C1] #0: ffffffff89bac140 (rcu_callback){....}, at: rcu_core+0x562/0x1390 [ 105.264104][ C1] [ 105.264104][ C1] stack backtrace: [ 105.270622][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-syzkaller #0 [ 105.278699][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 105.289533][ C1] Call Trace: [ 105.293725][ C1] [ 105.297205][ C1] dump_stack+0x197/0x210 [ 105.301843][ C1] print_usage_bug.cold+0x327/0x378 [ 105.307264][ C1] mark_lock+0xbb4/0x1220 [ 105.311792][ C1] ? kfree+0x10a/0x2c0 [ 105.316342][ C1] ? check_usage_backwards+0x330/0x330 [ 105.322688][ C1] ? __nf_hook_entries_free+0x31/0x40 [ 105.329553][ C1] __lock_acquire+0x1e8e/0x4a00 [ 105.336626][ C1] ? find_held_lock+0x35/0x130 [ 105.342118][ C1] ? __kasan_check_read+0x11/0x20 [ 105.347909][ C1] ? mark_lock+0xc2/0x1220 [ 105.352521][ C1] ? mark_held_locks+0xf0/0xf0 [ 105.358418][ C1] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 105.365565][ C1] lock_acquire+0x190/0x410 [ 105.370239][ C1] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 105.376066][ C1] _raw_spin_lock+0x2f/0x40 [ 105.380837][ C1] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 105.386757][ C1] rxrpc_put_client_conn+0x6ed/0xc90 [ 105.392327][ C1] ? rxrpc_rcu_destroy_call+0xbd/0x200 [ 105.398377][ C1] rxrpc_rcu_destroy_call+0xbd/0x200 [ 105.404288][ C1] rcu_core+0x5e1/0x1390 [ 105.408696][ C1] ? __rcu_read_unlock+0x700/0x700 [ 105.414377][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 105.422202][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 105.431693][ C1] rcu_core_si+0x9/0x10 [ 105.436438][ C1] __do_softirq+0x262/0x98c [ 105.442062][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 105.447272][ C1] irq_exit+0x19b/0x1e0 [ 105.452039][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 105.458397][ C1] apic_timer_interrupt+0xf/0x20 [ 105.463685][ C1] [ 105.466791][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 105.472618][ 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 [ 105.494145][ C1] RSP: 0018:ffffc90000d3fd68 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 105.503450][ C1] RAX: 1ffffffff1367612 RBX: ffff8880a99fc340 RCX: 0000000000000000 [ 105.511932][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a99fcbd4 [ 105.521089][ C1] RBP: ffffc90000d3fd98 R08: ffff8880a99fc340 R09: 0000000000000000 [ 105.530030][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 105.538740][ C1] R13: ffffffff8aa522c0 R14: 0000000000000000 R15: 0000000000000001 [ 105.547471][ C1] ? default_idle+0x4e/0x360