[ 36.193681] audit: type=1800 audit(1549258623.651:27): pid=7565 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 36.216043] audit: type=1800 audit(1549258623.661:28): pid=7565 uid=0 auid=4294967295 ses=4294967295 subj==unconfined 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.974453] audit: type=1800 audit(1549258624.491:29): pid=7565 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 [ 36.994178] audit: type=1800 audit(1549258624.491:30): pid=7565 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 '10.128.0.209' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 99.583241] [ 99.584922] ===================================== [ 99.589751] WARNING: bad unlock balance detected! [ 99.594585] 5.0.0-rc4+ #59 Not tainted [ 99.598454] ------------------------------------- [ 99.603282] syz-executor223/8256 is trying to release lock (sk_lock-AF_RXRPC) at: [ 99.610912] [] rxrpc_recvmsg+0x6d3/0x3099 [ 99.616608] but there are no more locks to release! [ 99.621618] [ 99.621618] other info that might help us debug this: [ 99.628285] 1 lock held by syz-executor223/8256: [ 99.633028] #0: 00000000fa9ed0f4 (slock-AF_RXRPC){+...}, at: release_sock+0x20/0x1c0 [ 99.641003] [ 99.641003] stack backtrace: [ 99.645491] CPU: 1 PID: 8256 Comm: syz-executor223 Not tainted 5.0.0-rc4+ #59 [ 99.652752] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.662095] Call Trace: [ 99.664698] dump_stack+0x172/0x1f0 [ 99.668325] ? rxrpc_recvmsg+0x6d3/0x3099 [ 99.672469] print_unlock_imbalance_bug.cold+0x114/0x123 [ 99.677917] ? rxrpc_recvmsg+0x6d3/0x3099 [ 99.682063] lock_release+0x67e/0xa00 [ 99.685859] ? do_raw_spin_lock+0x20e/0x2e0 [ 99.690173] ? lock_downgrade+0x810/0x810 [ 99.694320] release_sock+0x183/0x1c0 [ 99.698121] rxrpc_recvmsg+0x6d3/0x3099 [ 99.702098] ? rxrpc_notify_socket+0x5e0/0x5e0 [ 99.706677] ? aa_sk_perm+0x1c6/0x7c0 [ 99.710479] ? finish_wait+0x260/0x260 [ 99.714368] ? apparmor_socket_recvmsg+0x2a/0x30 [ 99.719120] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 99.724666] ? security_socket_recvmsg+0x9b/0xd0 [ 99.729420] ? rxrpc_notify_socket+0x5e0/0x5e0 [ 99.733997] sock_recvmsg+0xd0/0x110 [ 99.737707] __sys_recvfrom+0x1ff/0x350 [ 99.741679] ? __ia32_sys_send+0x100/0x100 [ 99.745913] ? _raw_spin_unlock_bh+0x31/0x40 [ 99.750321] ? lockdep_hardirqs_on+0x415/0x5d0 [ 99.754906] ? trace_hardirqs_on+0x67/0x230 [ 99.759225] ? _raw_spin_unlock_bh+0x31/0x40 [ 99.763638] ? release_sock+0x158/0x1c0 [ 99.767606] ? __x64_sys_futex+0x404/0x590 [ 99.771844] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 99.776591] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 99.781364] ? do_syscall_64+0x26/0x610 [ 99.785333] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 99.790691] __x64_sys_recvfrom+0xe1/0x1a0 [ 99.794930] do_syscall_64+0x103/0x610 [ 99.798814] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 99.803993] RIP: 0033:0x446379 [ 99.807180] Code: e8 2c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 99.826073] RSP: 002b:00007fe5da89fd98 EFLAGS: 00000246 ORIG_RAX: 000000000000002d executing program [ 99.833771] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446379 [ 99.841030] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 99.848294] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 99.855648] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 99.862917] R13: 0000000000000000 R14: 0000000000000000 R15: 20c49ba5e353f7cf executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program