[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 82.943691][ T27] audit: type=1800 audit(1581137554.757:25): pid=9608 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0
[ 82.976152][ T27] audit: type=1800 audit(1581137554.757:26): pid=9608 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0
[ 83.021323][ T27] audit: type=1800 audit(1581137554.757:27): pid=9608 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0
[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.0.153' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 95.999747][ T9765] IPVS: ftp: loaded support on port[0] = 21
[ 96.085314][ C0]
[ 96.087689][ C0] ================================
[ 96.092807][ C0] WARNING: inconsistent lock state
[ 96.097897][ C0] 5.5.0-syzkaller #0 Not tainted
[ 96.102800][ C0] --------------------------------
[ 96.107891][ C0] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
[ 96.114724][ C0] swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
[ 96.120679][ C0] ffff88809f4af9c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x6ed/0xc90
[ 96.131595][ C0] {SOFTIRQ-ON-W} state was registered at:
[ 96.137290][ C0] lock_acquire+0x190/0x410
[ 96.141853][ C0] _raw_spin_lock+0x2f/0x40
[ 96.146418][ C0] rxrpc_connect_call+0x358/0x4e30
[ 96.151587][ C0] rxrpc_new_client_call+0x9c0/0x1ad0
[ 96.157035][ C0] rxrpc_do_sendmsg+0xffa/0x1d5f
[ 96.162044][ C0] rxrpc_sendmsg+0x4d6/0x5f0
[ 96.166700][ C0] sock_sendmsg+0xd7/0x130
[ 96.171278][ C0] ____sys_sendmsg+0x358/0x880
[ 96.176115][ C0] ___sys_sendmsg+0x100/0x170
[ 96.180859][ C0] __sys_sendmmsg+0x1bf/0x4d0
[ 96.185757][ C0] __x64_sys_sendmmsg+0x9d/0x100
[ 96.190770][ C0] do_syscall_64+0xfa/0x790
[ 96.195349][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 96.201325][ C0] irq event stamp: 212628
[ 96.205637][ C0] hardirqs last enabled at (212628): [<ffffffff87ecc126>] _raw_spin_unlock_irqrestore+0x66/0xe0
[ 96.216112][ C0] hardirqs last disabled at (212627): [<ffffffff87ecc49f>] _raw_spin_lock_irqsave+0x6f/0xcd
[ 96.226146][ C0] softirqs last enabled at (212544): [<ffffffff8147568c>] _local_bh_enable+0x1c/0x30
[ 96.235658][ C0] softirqs last disabled at (212545): [<ffffffff8147808b>] irq_exit+0x19b/0x1e0
[ 96.244662][ C0]
[ 96.244662][ C0] other info that might help us debug this:
[ 96.252695][ C0] Possible unsafe locking scenario:
[ 96.252695][ C0]
[ 96.260134][ C0] CPU0
[ 96.263397][ C0] ----
[ 96.266663][ C0] lock(&(&local->client_conns_lock)->rlock);
[ 96.272790][ C0] <Interrupt>
[ 96.276216][ C0] lock(&(&local->client_conns_lock)->rlock);
[ 96.282515][ C0]
[ 96.282515][ C0] *** DEADLOCK ***
[ 96.282515][ C0]
[ 96.290645][ C0] 1 lock held by swapper/0/0:
[ 96.295297][ C0] #0: ffffffff89bac140 (rcu_callback){....}, at: rcu_core+0x562/0x1390
[ 96.303688][ C0]
[ 96.303688][ C0] stack backtrace:
[ 96.309568][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-syzkaller #0
[ 96.317081][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 96.327112][ C0] Call Trace:
[ 96.330369][ C0] <IRQ>
[ 96.333200][ C0] dump_stack+0x197/0x210
[ 96.337510][ C0] print_usage_bug.cold+0x327/0x378
[ 96.342693][ C0] mark_lock+0xbb4/0x1220
[ 96.348041][ C0] ? kfree+0x10a/0x2c0
[ 96.352085][ C0] ? check_usage_backwards+0x330/0x330
[ 96.357518][ C0] ? __nf_hook_entries_free+0x31/0x40
[ 96.362864][ C0] __lock_acquire+0x1e8e/0x4a00
[ 96.367691][ C0] ? find_held_lock+0x35/0x130
[ 96.372503][ C0] ? __kasan_check_read+0x11/0x20
[ 96.377611][ C0] ? mark_lock+0xc2/0x1220
[ 96.382015][ C0] ? mark_held_locks+0xf0/0xf0
[ 96.386774][ C0] ? _raw_spin_unlock_irqrestore+0x66/0xe0
[ 96.392567][ C0] lock_acquire+0x190/0x410
[ 96.397068][ C0] ? rxrpc_put_client_conn+0x6ed/0xc90
[ 96.402505][ C0] _raw_spin_lock+0x2f/0x40
[ 96.406994][ C0] ? rxrpc_put_client_conn+0x6ed/0xc90
[ 96.412430][ C0] rxrpc_put_client_conn+0x6ed/0xc90
[ 96.417691][ C0] ? rxrpc_rcu_destroy_call+0xbd/0x200
[ 96.423129][ C0] rxrpc_rcu_destroy_call+0xbd/0x200
[ 96.428414][ C0] rcu_core+0x5e1/0x1390
[ 96.432652][ C0] ? __rcu_read_unlock+0x700/0x700
[ 96.437745][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0
[ 96.443271][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50
[ 96.449236][ C0] ? run_rebalance_domains+0x227/0x2d0
[ 96.454685][ C0] rcu_core_si+0x9/0x10
[ 96.458825][ C0] __do_softirq+0x262/0x98c
[ 96.463301][ C0] ? sched_clock_cpu+0x1b/0x1b0
[ 96.468129][ C0] irq_exit+0x19b/0x1e0
[ 96.472278][ C0] smp_apic_timer_interrupt+0x1a3/0x610
[ 96.477799][ C0] apic_timer_interrupt+0xf/0x20
[ 96.482708][ C0] </IRQ>
[ 96.485622][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 96.490966][ C0] 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 <c3> cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 7e 2f 76 f9 e8 19
[ 96.510554][ C0] RSP: 0018:ffffffff89a07ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
[ 96.518949][ C0] RAX: 1ffffffff1367612 RBX: ffffffff89a7a440 RCX: 0000000000000000
[ 96.526945][ C0] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff89a7acd4
[ 96.535015][ C0] RBP: ffffffff89a07d18 R08: ffffffff89a7a440 R09: 0000000000000000
[ 96.542971][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
[ 96.550921][ C0] R13: ffffffff8aa52400 R14: 0000000000000000 R15: 0000000000000000
[ 96.558886][ C0] ? default_idle+0x4e/0x360
[ 96.563468][ C0] arch_cpu_idle+0xa/0x10
[ 96.567777][ C0] default_idle_call+0x84/0xb0
[ 96.572528][ C0] do_idle+0x3c8/0x6e0
[ 96.576585][ C0] ? arch_cpu_idle_exit+0x80/0x80
[ 96.581585][ C0] ? trace_hardirqs_on+0x67/0x240
[ 96.586593][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[ 96.592821][ C0] ? debug_smp_processor_id+0x33/0x18a
[ 96.598274][ C0] cpu_startup_entry+0x1b/0x20
[ 96.603033][ C0] rest_init+0x23b/0x371
[ 96.607329][ C0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe
[ 96.613544][ C0] arch_call_rest_init+0xe/0x1b
[ 96.618382][ C0] start_kernel+0x886/0x8c5
[ 96.622868][ C0] ? mem_encrypt_init+0xb/0xb
[ 96.627523][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[ 96.633750][ C0] ? x86_family+0x41/0x50