[ 89.279068][ T27] audit: type=1800 audit(1581139661.448:26): pid=9579 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 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. [ 90.224639][ T27] kauditd_printk_skb: 2 callbacks suppressed [ 90.224650][ T27] audit: type=1800 audit(1581139662.408:29): pid=9579 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 [ 90.251156][ T27] audit: type=1800 audit(1581139662.418:30): pid=9579 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 '10.128.0.218' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 100.084705][ T9732] IPVS: ftp: loaded support on port[0] = 21 [ 100.136902][ C1] [ 100.139255][ C1] ================================ [ 100.144569][ C1] WARNING: inconsistent lock state [ 100.149785][ C1] 5.5.0-syzkaller #0 Not tainted [ 100.154726][ C1] -------------------------------- [ 100.159958][ C1] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 100.166803][ C1] swapper/1/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 100.172763][ C1] ffff8880a05fb9c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x6ed/0xc90 [ 100.183689][ C1] {SOFTIRQ-ON-W} state was registered at: [ 100.189395][ C1] lock_acquire+0x190/0x410 [ 100.194066][ C1] _raw_spin_lock+0x2f/0x40 [ 100.199211][ C1] rxrpc_connect_call+0x358/0x4e30 [ 100.204758][ C1] rxrpc_new_client_call+0x9c0/0x1ad0 [ 100.210373][ C1] rxrpc_do_sendmsg+0xffa/0x1d5f [ 100.215567][ C1] rxrpc_sendmsg+0x4d6/0x5f0 [ 100.220229][ C1] sock_sendmsg+0xd7/0x130 [ 100.225105][ C1] ____sys_sendmsg+0x358/0x880 [ 100.230698][ C1] ___sys_sendmsg+0x100/0x170 [ 100.235847][ C1] __sys_sendmmsg+0x1bf/0x4d0 [ 100.240612][ C1] __x64_sys_sendmmsg+0x9d/0x100 [ 100.245622][ C1] do_syscall_64+0xfa/0x790 [ 100.250194][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 100.256405][ C1] irq event stamp: 172236 [ 100.261066][ C1] hardirqs last enabled at (172236): [] _raw_spin_unlock_irqrestore+0x66/0xe0 [ 100.271672][ C1] hardirqs last disabled at (172235): [] _raw_spin_lock_irqsave+0x6f/0xcd [ 100.281903][ C1] softirqs last enabled at (172152): [] _local_bh_enable+0x1c/0x30 [ 100.291881][ C1] softirqs last disabled at (172153): [] irq_exit+0x19b/0x1e0 [ 100.300974][ C1] [ 100.300974][ C1] other info that might help us debug this: [ 100.309229][ C1] Possible unsafe locking scenario: [ 100.309229][ C1] [ 100.316662][ C1] CPU0 [ 100.320119][ C1] ---- [ 100.323480][ C1] lock(&(&local->client_conns_lock)->rlock); [ 100.329813][ C1] [ 100.333308][ C1] lock(&(&local->client_conns_lock)->rlock); [ 100.339705][ C1] [ 100.339705][ C1] *** DEADLOCK *** [ 100.339705][ C1] [ 100.347828][ C1] 1 lock held by swapper/1/0: [ 100.352590][ C1] #0: ffffffff89bac140 (rcu_callback){....}, at: rcu_core+0x562/0x1390 [ 100.361090][ C1] [ 100.361090][ C1] stack backtrace: [ 100.367094][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-syzkaller #0 [ 100.374623][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 100.385379][ C1] Call Trace: [ 100.389993][ C1] [ 100.392855][ C1] dump_stack+0x197/0x210 [ 100.397168][ C1] print_usage_bug.cold+0x327/0x378 [ 100.402350][ C1] mark_lock+0xbb4/0x1220 [ 100.406675][ C1] ? kfree+0x10a/0x2c0 [ 100.410751][ C1] ? check_usage_backwards+0x330/0x330 [ 100.416300][ C1] ? __nf_hook_entries_free+0x31/0x40 [ 100.422010][ C1] __lock_acquire+0x1e8e/0x4a00 [ 100.427009][ C1] ? find_held_lock+0x35/0x130 [ 100.431765][ C1] ? __kasan_check_read+0x11/0x20 [ 100.436771][ C1] ? mark_lock+0xc2/0x1220 [ 100.441363][ C1] ? mark_held_locks+0xf0/0xf0 [ 100.446115][ C1] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 100.451998][ C1] lock_acquire+0x190/0x410 [ 100.456493][ C1] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 100.461962][ C1] _raw_spin_lock+0x2f/0x40 [ 100.466456][ C1] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 100.471895][ C1] rxrpc_put_client_conn+0x6ed/0xc90 [ 100.477174][ C1] ? rxrpc_rcu_destroy_call+0xbd/0x200 [ 100.482729][ C1] rxrpc_rcu_destroy_call+0xbd/0x200 [ 100.487997][ C1] rcu_core+0x5e1/0x1390 [ 100.492319][ C1] ? __rcu_read_unlock+0x700/0x700 [ 100.497441][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 100.503236][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 100.509217][ C1] ? run_rebalance_domains+0x227/0x2d0 [ 100.514667][ C1] rcu_core_si+0x9/0x10 [ 100.518810][ C1] __do_softirq+0x262/0x98c [ 100.523626][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 100.528466][ C1] irq_exit+0x19b/0x1e0 [ 100.532711][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 100.538401][ C1] apic_timer_interrupt+0xf/0x20 [ 100.543433][ C1] [ 100.546550][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 100.551907][ 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 [ 100.571670][ C1] RSP: 0018:ffffc90000d3fd68 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 100.580067][ C1] RAX: 1ffffffff1367612 RBX: ffff8880a99fc340 RCX: 0000000000000000 [ 100.588278][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a99fcbd4 [ 100.597243][ C1] RBP: ffffc90000d3fd98 R08: ffff8880a99fc340 R09: 0000000000000000 [ 100.605323][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 100.613403][ C1] R13: ffffffff8aa52400 R14: 0000000000000000 R15: 0000000000000001 [ 100.621442][ C1] ? default_idle+0x4e/0x360 [ 100.626043][ C1] arch_cpu_idle+0xa/0x10 [ 100.630362][ C1] default_idle_call+0x84/0xb0 [ 100.636138][ C1] do_idle+0x3c8/