[ 76.745547][ T27] audit: type=1800 audit(1583116101.408:25): pid=10095 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 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. [ 77.595650][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 77.595662][ T27] audit: type=1800 audit(1583116102.258:29): pid=10095 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 [ 77.622309][ T27] audit: type=1800 audit(1583116102.258:30): pid=10095 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 '10.128.0.242' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 95.090651][T10249] [ 95.093024][T10249] ===================================== [ 95.098572][T10249] WARNING: bad unlock balance detected! [ 95.104152][T10249] 5.6.0-rc3-syzkaller #0 Not tainted [ 95.109408][T10249] ------------------------------------- [ 95.114935][T10249] syz-executor331/10249 is trying to release lock (&ovl_i_lock_key[depth]) at: [ 95.123866][T10249] [] ovl_llseek+0x29d/0x3b0 [ 95.129917][T10249] but there are no more locks to release! [ 95.135613][T10249] [ 95.135613][T10249] other info that might help us debug this: [ 95.143674][T10249] 1 lock held by syz-executor331/10249: [ 95.149549][T10249] #0: ffff88809eba98e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 95.159139][T10249] [ 95.159139][T10249] stack backtrace: [ 95.165044][T10249] CPU: 1 PID: 10249 Comm: syz-executor331 Not tainted 5.6.0-rc3-syzkaller #0 [ 95.174156][T10249] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 95.185145][T10249] Call Trace: [ 95.188430][T10249] dump_stack+0x197/0x210 [ 95.192753][T10249] ? ovl_llseek+0x29d/0x3b0 [ 95.197268][T10249] print_unlock_imbalance_bug.cold+0x114/0x123 [ 95.203446][T10249] ? ovl_llseek+0x29d/0x3b0 [ 95.207968][T10249] lock_release+0x5f2/0x960 [ 95.212455][T10249] ? lock_downgrade+0x920/0x920 [ 95.217418][T10249] ? __kasan_check_write+0x14/0x20 [ 95.222516][T10249] ? up_read+0x1cd/0x810 [ 95.226752][T10249] ? iomap_seek_hole+0x16f/0x1d0 [ 95.231678][T10249] __mutex_unlock_slowpath+0x86/0x6a0 [ 95.237038][T10249] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 95.242779][T10249] ? wait_for_completion+0x440/0x440 [ 95.248057][T10249] ? ext4_llseek+0x193/0x2f0 [ 95.252650][T10249] mutex_unlock+0xd/0x10 [ 95.256900][T10249] ovl_llseek+0x29d/0x3b0 [ 95.261839][T10249] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 95.267382][T10249] ? ovl_aio_rw_complete+0x80/0x80 [ 95.272605][T10249] ? mutex_lock_nested+0x16/0x20 [ 95.277537][T10249] ? ovl_aio_rw_complete+0x80/0x80 [ 95.282879][T10249] ksys_lseek+0x116/0x1b0 [ 95.287211][T10249] __x64_sys_lseek+0x73/0xb0 [ 95.291849][T10249] do_syscall_64+0xfa/0x790 [ 95.296350][T10249] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 95.302283][T10249] RIP: 0033:0x4459b9 [ 95.306221][T10249] Code: e8 bc b7 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 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 95.326041][T10249] RSP: 002b:00007fcbc3512db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000008 [ 95.334442][T10249] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 000000000044