[ 116.075961][ T27] audit: type=1800 audit(1581199957.804:36): pid=10911 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 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 mcstransd: [ 116.816137][ T27] audit: type=1400 audit(1581199958.664:37): avc: denied { watch } for pid=10998 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 Warning: Permanently added '10.128.0.161' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 125.572737][ T27] kauditd_printk_skb: 4 callbacks suppressed [ 125.572753][ T27] audit: type=1400 audit(1581199967.424:42): avc: denied { map } for pid=11101 comm="syz-executor648" path="/root/syz-executor648870419" 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 [ 125.589663][T11102] IPVS: ftp: loaded support on port[0] = 21 [ 125.669316][ C1] [ 125.671661][ C1] ================================ [ 125.676769][ C1] WARNING: inconsistent lock state [ 125.681871][ C1] 5.5.0-syzkaller #0 Not tainted [ 125.686782][ C1] -------------------------------- [ 125.691956][ C1] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 125.698803][ C1] swapper/1/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 125.704891][ C1] ffff88809fd729c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x6ed/0xc90 [ 125.716078][ C1] {SOFTIRQ-ON-W} state was registered at: [ 125.722666][ C1] lock_acquire+0x190/0x410 [ 125.727311][ C1] _raw_spin_lock+0x2f/0x40 [ 125.732246][ C1] rxrpc_connect_call+0x358/0x4e30 [ 125.737509][ C1] rxrpc_new_client_call+0x9c0/0x1ad0 [ 125.743291][ C1] rxrpc_do_sendmsg+0xffa/0x1d5f [ 125.748306][ C1] rxrpc_sendmsg+0x4d6/0x5f0 [ 125.753086][ C1] sock_sendmsg+0xd7/0x130 [ 125.757661][ C1] ____sys_sendmsg+0x358/0x880 [ 125.762491][ C1] ___sys_sendmsg+0x100/0x170 [ 125.767264][ C1] __sys_sendmmsg+0x1bf/0x4d0 [ 125.772029][ C1] __x64_sys_sendmmsg+0x9d/0x100 [ 125.777036][ C1] do_syscall_64+0xfa/0x790 [ 125.781603][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 125.787627][ C1] irq event stamp: 170620 [ 125.792005][ C1] hardirqs last enabled at (170620): [] _raw_spin_unlock_irqrestore+0x66/0xe0 [ 125.802518][ C1] hardirqs last disabled at (170619): [] _raw_spin_lock_irqsave+0x6f/0xcd [ 125.812585][ C1] softirqs last enabled at (170452): [] _local_bh_enable+0x1c/0x30 [ 125.822219][ C1] softirqs last disabled at (170453): [] irq_exit+0x19b/0x1e0 [ 125.831426][ C1] [ 125.831426][ C1] other info that might help us debug this: [ 125.839466][ C1] Possible unsafe locking scenario: [ 125.839466][ C1] [ 125.846934][ C1] CPU0 [ 125.850210][ C1] ---- [ 125.853465][ C1] lock(&(&local->client_conns_lock)->rlock); [ 125.859618][ C1] [ 125.863760][ C1] lock(&(&local->client_conns_lock)->rlock); [ 125.870176][ C1] [ 125.870176][ C1] *** DEADLOCK *** [ 125.870176][ C1] [ 125.878423][ C1] 1 lock held by swapper/1/0: [ 125.883102][ C1] #0: ffffffff89bac140 (rcu_callback){....}, at: rcu_core+0x562/0x1390 [ 125.891548][ C1] [ 125.891548][ C1] stack backtrace: [ 125.897435][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-syzkaller #0 [ 125.904966][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 125.915020][ C1] Call Trace: [ 125.918289][ C1] [ 125.921244][ C1] dump_stack+0x197/0x210 [ 125.925778][ C1] print_usage_bug.cold+0x327/0x378 [ 125.931204][ C1] mark_lock+0xbb4/0x1220 [ 125.935535][ C1] ? kfree+0x10a/0x2c0 [ 125.939685][ C1] ? check_usage_backwards+0x330/0x330 [ 125.945446][ C1] ? __nf_hook_entries_free+0x31/0x40 [ 125.950946][ C1] __lock_acquire+0x1e8e/0x4a00 [ 125.956011][ C1] ? find_held_lock+0x35/0x130 [ 125.960778][ C1] ? __kasan_check_read+0x11/0x20 [ 125.965818][ C1] ? mark_lock+0xc2/0x1220 [ 125.970411][ C1] ? mark_held_locks+0xf0/0xf0 [ 125.975169][ C1] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 125.981005][ C1] lock_acquire+0x190/0x410 [ 125.985617][ C1] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 125.991188][ C1] _raw_spin_lock+0x2f/0x40 [ 125.995676][ C1] ? rxrpc_put_client_conn+0x6ed/0xc90 [ 126.001219][ C1] rxrpc_put_client_conn+0x6ed/0xc90 [ 126.006652][ C1] ? rxrpc_rcu_destroy_call+0xbd/0x200 [ 126.012206][ C1] rxrpc_rcu_destroy_call+0xbd/0x200 [ 126.017479][ C1] rcu_core+0x5e1/0x1390 [ 126.021740][ C1] ? __rcu_read_unlock+0x700/0x700 [ 126.026930][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 126.032843][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 126.038812][ C1] ? run_rebalance_domains+0x227/0x2d0 [ 126.044351][ C1] rcu_core_si+0x9/0x10 [ 126.048576][ C1] __do_softirq+0x262/0x98c [ 126.053212][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 126.058097][ C1] irq_exit+0x19b/0x1e0 [ 126.062254][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 126.068015][ C1] apic_timer_interrupt+0xf/0x20 [ 126.072954][ C1] [ 126.075913][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 126.081271][ C1] Code: d8 66 c6 f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d d4 c9 5a 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d c4 c9 5a 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 0e 26 75 f9 e8 09 [ 126.102168][ C1] RSP: 0018:ffffc90000d3fd68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 126.110670][ C1] RAX: 1ffffffff1367612 RBX: ffff8880a9a0a340 RCX: 0000000000000000 [ 126.118633][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a9a0abd4 [ 126.126786][ C1] RBP: ffffc90000d3fd98 R08: ffff8880a9a0a340 R09: 0000000000000000 [ 126.134864][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 126.142826][ C1] R13: ffffffff8aa58b80 R14: 0000000000000000 R15: 0000000000000001 [ 126.150806][ C1] ? default_idle+0x4e/0x360 [ 126.155614][ C1] arch_cpu_idle+0xa/0x10 [ 126.160152][ C1] default_idle_call+0x84/0xb0 [ 126.165121][ C1] do_idle+0x3c8/0x6e0 [ 126.169353][ C1] ?