[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [ 101.455134][ T27] audit: type=1400 audit(1581110696.788:37): avc: denied { watch } for pid=10658 comm="restorecond" path="/root/.ssh" dev="sda1" ino=16179 scontext=system_u:system_r:kernel_t:s0 tcontext=unconfined_u:object_r:ssh_home_t:s0 tclass=dir permissive=1 [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 104.665986][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 104.666002][ T27] audit: type=1400 audit(1581110700.008:41): avc: denied { map } for pid=10747 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.168' (ECDSA) to the list of known hosts. executing program [ 111.724472][ T27] audit: type=1400 audit(1581110707.058:42): avc: denied { map } for pid=10759 comm="syz-executor994" path="/root/syz-executor994410432" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 111.741710][T10760] IPVS: ftp: loaded support on port[0] = 21 [ 111.815300][ C0] [ 111.817744][ C0] ================================ [ 111.822969][ C0] WARNING: inconsistent lock state [ 111.828073][ C0] 5.5.0-syzkaller #0 Not tainted [ 111.833057][ C0] -------------------------------- [ 111.838284][ C0] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 111.845121][ C0] swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 111.851111][ C0] ffff8880963719c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x6ed/0xc90 [ 111.862054][ C0] {SOFTIRQ-ON-W} state was registered at: [ 111.867780][ C0] lock_acquire+0x190/0x410 [ 111.872372][ C0] _raw_spin_lock+0x2f/0x40 [ 111.876969][ C0] rxrpc_connect_call+0x358/0x4e30 [ 111.882166][ C0] rxrpc_new_client_call+0x9c0/0x1ad0 [ 111.887661][ C0] rxrpc_do_sendmsg+0xffa/0x1d5f [ 111.892682][ C0] rxrpc_sendmsg+0x4d6/0x5f0 [ 111.897694][ C0] sock_sendmsg+0xd7/0x130 [ 111.902197][ C0] ____sys_sendmsg+0x358/0x880 [ 111.907031][ C0] ___sys_sendmsg+0x100/0x170 [ 111.911839][ C0] __sys_sendmmsg+0x1bf/0x4d0 [ 111.916593][ C0] __x64_sys_sendmmsg+0x9d/0x100 [ 111.922356][ C0] do_syscall_64+0xfa/0x790 [ 111.926987][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 111.932951][ C0] irq event stamp: 165854 [ 111.937318][ C0] hardirqs last enabled at (165854): [] _raw_spin_unlock_irqrestore+0x66/0xe0 [ 111.947833][ C0] hardirqs last disabled at (165853): [] _raw_spin_lock_irqsave+0x6f/0xcd [ 111.957895][ C0] softirqs last enabled at (165682): [] _local_bh_enable+0x1c/0x30 [ 111.967443][ C0] softirqs last disabled at (165683): [] irq_exit+0x19b/0x1e0 [ 111.976530][ C0] [ 111.976530][ C0] other info that might help us debug this: [ 111.984588][ C0] Possible unsafe locking scenario: [ 111.984588][ C0] [ 111.992077][ C0] CPU0 [ 111.995344][ C0] ---- [ 111.998662][ C0] lock(&(&local->client_conns_lock)->rlock); [ 112.005029][ C0] [ 112.008472][ C0] lock(&(&local->client_conns_lock)->rlock); [ 112.014788][ C0] [ 112.014788][ C0] *** DEADLOCK *** [ 112.014788][ C0] [ 112.023189][ C0] 1 lock held by swapper/0/0: [ 112.027881][ C0] #0: ffffffff89bac140 (rcu_callback){....}, at: rcu_core+0x562/0x1390 [ 112.036227][ C0] [ 112.036227][ C0] stack backtrace: [ 112.042111][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-syzkaller #0 [ 112.049635][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 112.059689][ C0] Call Trace: [ 112.062955][ C0] [ 112.065792][ C0] dump_stack+0x197/0x210 [ 112.070122][ C0] print_usage_bug.cold+0x327/0x378 [ 112.075306][ C0] mark_lock+0xbb4/0x1220 [ 112.080014][ C0] ? kfree+0x10a/0x2c0 [ 112.084204][ C0] ? check_usage_backwards+0x330/0x330 [ 112.089649][ C0] ? __nf_hook_entries_free+0x31/0x40 [ 112.095009][ C0] __lock_acquire+0x1e8e/0x4a00 [ 112.099860][ C0] ? find_held_lock+0x35/0x130 [ 112.104607][ C0] ? __kasan_check_read+0x11/0x20 [ 112.109635][ C0] ? mark_lock+0xc2/0x1220 [ 112.114031][ C0] ? mark_held_locks+0xf0/0xf0 [ 112.118792][ C0] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 112.124599][ C0] lock_acquire+0x190/0x410 [ 112.129100][ C0] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 112.134588][ C0] _raw_spin_lock+0x2f/0x40 [ 112.139096][ C0] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 112.144564][ C0] rxrpc_put_client_conn+0x6ed/0xc90 [ 112.149855][ C0] ? rxrpc_rcu_destroy_call+0xbd/0x200 [ 112.155338][ C0] rxrpc_rcu_destroy_call+0xbd/0x200 [ 112.160706][ C0] rcu_core+0x5e1/0x1390 [ 112.164956][ C0] ? __rcu_read_unlock+0x700/0x700 [ 112.170116][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 112.175646][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 112.181682][ C0] ? run_rebalance_domains+0x227/0x2d0 [ 112.187147][ C0] rcu_core_si+0x9/0x10 [ 112.191300][ C0] __do_softirq+0x262/0x98c [ 112.195914][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 112.200751][ C0] irq_exit+0x19b/0x1e0 [ 112.204909][ C0] smp_apic_timer_interrupt+0x1a3/0x610 [ 112.210452][ C0] apic_timer_interrupt+0xf/0x20 [ 112.215423][ C0] [ 112.218523][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 112.223880][ 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 [ 112.243480][ C0] RSP: 0018:ffffffff89a07ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 112.251888][ C0] RAX: 1ffffffff1367612 RBX: ffffffff89a7a440 RCX: 0000000000000000 [ 112.259860][ C0] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff89a7acd4 [ 112.267813][ C0] RBP: ffffffff89a07d18 R08: ffffffff89a7a440 R09: 0000000000000000 [ 112.275794][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 112.283798][ C0] R13: ffffffff8aa522c0 R14: 0000000000000000 R15: 0000000000000000 [ 112.291796][ C0] ? default_idle+0x4e/0x360 [ 112.296390][ C0] arch_cpu_idle+0xa/0x10 [ 112.300711][ C0] default_idle_call+0x84/0xb0 [ 112.305465][ C0] do_idle+0x3c8/0x6e0 [ 112.309524][ C0] ? arch_cpu_idle_exit+0x80/0x80 [ 112.314537][ C0] ? trace_hardirqs_on+0x67/0x240 [ 112.319674][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 112.325908][ C0] ? debug_smp_processor_id+0x33/0x18a [ 112.331385][ C0] cpu_startup_entry+0x1b/0x20 [ 112.336174][ C0] rest_init+0x23b/0x371 [ 112.340445][ C0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 112.346802][ C0] arch_call_rest_init+0xe/0x1b [ 112.351649][ C0] start_kernel+0x886/0x8c5 [ 112.356141][ C0] ? mem_encrypt_init+0xb/0xb [ 112.360808][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 112.367