[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 79.308723][ T27] audit: type=1800 audit(1581087139.353:25): pid=9390 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 79.328745][ T27] audit: type=1800 audit(1581087139.353:26): pid=9390 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 79.383832][ T27] audit: type=1800 audit(1581087139.353:27): pid=9390 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[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.255' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 89.427431][ T9541] IPVS: ftp: loaded support on port[0] = 21 [ 89.479959][ C0] [ 89.482318][ C0] ================================ [ 89.487408][ C0] WARNING: inconsistent lock state [ 89.492536][ C0] 5.5.0-syzkaller #0 Not tainted [ 89.497448][ C0] -------------------------------- [ 89.502545][ C0] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 89.509393][ C0] swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 89.515366][ C0] ffff8880a36029c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x6ed/0xc90 [ 89.526292][ C0] {SOFTIRQ-ON-W} state was registered at: [ 89.532002][ C0] lock_acquire+0x190/0x410 [ 89.536583][ C0] _raw_spin_lock+0x2f/0x40 [ 89.541162][ C0] rxrpc_connect_call+0x358/0x4e30 [ 89.546363][ C0] rxrpc_new_client_call+0x9c0/0x1ad0 [ 89.551807][ C0] rxrpc_do_sendmsg+0xffa/0x1d5f [ 89.556819][ C0] rxrpc_sendmsg+0x4d6/0x5f0 [ 89.561478][ C0] sock_sendmsg+0xd7/0x130 [ 89.565959][ C0] ____sys_sendmsg+0x358/0x880 [ 89.570792][ C0] ___sys_sendmsg+0x100/0x170 [ 89.575543][ C0] __sys_sendmmsg+0x1bf/0x4d0 [ 89.580287][ C0] __x64_sys_sendmmsg+0x9d/0x100 [ 89.585351][ C0] do_syscall_64+0xfa/0x790 [ 89.589937][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 89.595892][ C0] irq event stamp: 190736 [ 89.600251][ C0] hardirqs last enabled at (190736): [] _raw_spin_unlock_irqrestore+0x66/0xe0 [ 89.610786][ C0] hardirqs last disabled at (190735): [] _raw_spin_lock_irqsave+0x6f/0xcd [ 89.620838][ C0] softirqs last enabled at (190660): [] _local_bh_enable+0x1c/0x30 [ 89.630364][ C0] softirqs last disabled at (190661): [] irq_exit+0x19b/0x1e0 [ 89.639399][ C0] [ 89.639399][ C0] other info that might help us debug this: [ 89.647438][ C0] Possible unsafe locking scenario: [ 89.647438][ C0] [ 89.654869][ C0] CPU0 [ 89.658129][ C0] ---- [ 89.661393][ C0] lock(&(&local->client_conns_lock)->rlock); [ 89.667569][ C0] [ 89.671011][ C0] lock(&(&local->client_conns_lock)->rlock); [ 89.677370][ C0] [ 89.677370][ C0] *** DEADLOCK *** [ 89.677370][ C0] [ 89.685939][ C0] 1 lock held by swapper/0/0: [ 89.690593][ C0] #0: ffffffff89bac140 (rcu_callback){....}, at: rcu_core+0x562/0x1390 [ 89.698972][ C0] [ 89.698972][ C0] stack backtrace: [ 89.704904][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-syzkaller #0 [ 89.712481][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 89.722522][ C0] Call Trace: [ 89.725788][ C0] [ 89.728627][ C0] dump_stack+0x197/0x210 [ 89.732938][ C0] print_usage_bug.cold+0x327/0x378 [ 89.738135][ C0] mark_lock+0xbb4/0x1220 [ 89.742445][ C0] ? kfree+0x10a/0x2c0 [ 89.746506][ C0] ? check_usage_backwards+0x330/0x330 [ 89.751946][ C0] ? __nf_hook_entries_free+0x31/0x40 [ 89.757334][ C0] __lock_acquire+0x1e8e/0x4a00 [ 89.762163][ C0] ? find_held_lock+0x35/0x130 [ 89.766917][ C0] ? __kasan_check_read+0x11/0x20 [ 89.771919][ C0] ? mark_lock+0xc2/0x1220 [ 89.776364][ C0] ? mark_held_locks+0xf0/0xf0 [ 89.781159][ C0] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 89.786948][ C0] lock_acquire+0x190/0x410 [ 89.791483][ C0] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 89.796980][ C0] _raw_spin_lock+0x2f/0x40 [ 89.801469][ C0] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 89.806921][ C0] rxrpc_put_client_conn+0x6ed/0xc90 [ 89.812200][ C0] ? rxrpc_rcu_destroy_call+0xbd/0x200 [ 89.817655][ C0] rxrpc_rcu_destroy_call+0xbd/0x200 [ 89.822935][ C0] rcu_core+0x5e1/0x1390 [ 89.827166][ C0] ? __rcu_read_unlock+0x700/0x700 [ 89.832290][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 89.837836][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 89.843816][ C0] ? run_rebalance_domains+0x227/0x2d0 [ 89.849281][ C0] rcu_core_si+0x9/0x10 [ 89.853446][ C0] __do_softirq+0x262/0x98c [ 89.857930][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 89.862763][ C0] irq_exit+0x19b/0x1e0 [ 89.866917][ C0] smp_apic_timer_interrupt+0x1a3/0x610 [ 89.872496][ C0] apic_timer_interrupt+0xf/0x20 [ 89.877417][ C0] [ 89.880392][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 89.885744][ 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 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 7e 2f 76 f9 e8 19 [ 89.905335][ C0] RSP: 0018:ffffffff89a07ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 89.913848][ C0] RAX: 1ffffffff1367612 RBX: ffffffff89a7a440 RCX: 0000000000000000 [ 89.921810][ C0] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff89a7acd4 [ 89.929776][ C0] RBP: ffffffff89a07d18 R08: ffffffff89a7a440 R09: 0000000000000000 [ 89.937735][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 89.945697][ C0] R13: ffffffff8aa522c0 R14: 0000000000000000 R15: 0000000000000000 [ 89.954049][ C0] ? default_idle+0x4e/0x360 [ 89.958639][ C0] arch_cpu_idle+0xa/0x10 [ 89.962955][ C0] default_idle_call+0x84/0xb0 [ 89.967763][ C0] do_idle+0x3c8/0x6e0 [ 89.971894][ C0] ? arch_cpu_idle_exit+0x80/0x80 [ 89.976911][ C0] ? trace_hardirqs_on+0x67/0x240 [ 89.981921][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 89.988160][ C0] ? debug_smp_processor_id+0x33/0x18a [ 89.993603][ C0] cpu_startup_entry+0x1b/0x20 [ 89.998359][ C0] rest_init+0x23b/0x371 [ 90.002585][ C0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 90.008808][ C0] arch_call_rest_init+0xe/0x1b [ 90.013649][ C0] start_kernel+0x886/0x8c5 [ 90.018145][ C0] ? mem_encrypt_init+0xb/0xb [ 90.022817][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 90.029059][ C0] ? x86_family+