[ 39.885011] audit: type=1800 audit(1577941321.351:30): pid=7539 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] 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: [ 43.902853] kauditd_printk_skb: 4 callbacks suppressed [ 43.902869] audit: type=1400 audit(1577941325.391:35): avc: denied { map } for pid=7712 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 '10.128.0.102' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program [ 50.525149] audit: type=1400 audit(1577941332.011:36): avc: denied { map } for pid=7724 comm="syz-executor251" path="/root/syz-executor251409847" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 50.581074] [ 50.582828] ===================================== [ 50.587721] WARNING: bad unlock balance detected! [ 50.592604] 4.19.92-syzkaller #0 Not tainted [ 50.597003] ------------------------------------- [ 50.601836] kworker/u4:3/184 is trying to release lock (&file->mut) at: [ 50.608730] [] ucma_event_handler+0x711/0xef0 [ 50.614908] but there are no more locks to release! [ 50.620055] [ 50.620055] other info that might help us debug this: [ 50.626744] 4 locks held by kworker/u4:3/184: executing program [ 50.631406] #0: 0000000086f9aafc ((wq_completion)"ib_addr"){+.+.}, at: process_one_work+0x87e/0x1750 [ 50.640779] #1: 000000004776d5af ((work_completion)(&(&req->work)->work)){+.+.}, at: process_one_work+0x8b4/0x1750 [ 50.651384] #2: 0000000097e2b64c (&id_priv->handler_mutex){+.+.}, at: addr_handler+0xaf/0x3e0 [ 50.660161] #3: 00000000b74af1e5 (&file->mut){+.+.}, at: ucma_event_handler+0xb3/0xef0 [ 50.668343] [ 50.668343] stack backtrace: [ 50.673805] CPU: 0 PID: 184 Comm: kworker/u4:3 Not tainted 4.19.92-syzkaller #0 executing program [ 50.681257] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.690632] Workqueue: ib_addr process_one_req [ 50.695739] Call Trace: [ 50.698349] dump_stack+0x197/0x210 [ 50.702028] ? ucma_event_handler+0x711/0xef0 [ 50.706526] print_unlock_imbalance_bug.cold+0x114/0x123 [ 50.712284] ? ucma_event_handler+0x711/0xef0 [ 50.716783] lock_release+0x6cd/0xa30 [ 50.720893] ? trace_hardirqs_on_caller+0x6a/0x220 [ 50.725994] ? lock_downgrade+0x880/0x880 executing program executing program executing program [ 50.730317] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 50.735093] __mutex_unlock_slowpath+0x8e/0x6b0 [ 50.739774] ? wait_for_completion+0x440/0x440 [ 50.744382] ? __wake_up_common_lock+0x17d/0x190 [ 50.749256] mutex_unlock+0xd/0x10 [ 50.752807] ucma_event_handler+0x711/0xef0 [ 50.757253] addr_handler+0x2f1/0x3e0 [ 50.761062] ? cma_work_handler+0x1f0/0x1f0 [ 50.765676] ? process_one_work+0x890/0x1750 [ 50.770094] ? __lock_is_held+0xb6/0x140 [ 50.774154] process_one_req+0xfc/0x640 executing program executing program executing program executing program executing program executing program executing program [ 50.778147] process_one_work+0x989/0x1750 [ 50.782901] ? pwq_dec_nr_in_flight+0x320/0x320 [ 50.787586] ? lock_acquire+0x16f/0x3f0 [ 50.791719] ? kasan_check_write+0x14/0x20 [ 50.795972] ? do_raw_spin_lock+0xc8/0x240 [ 50.800489] worker_thread+0x98/0xe40 [ 50.804326] ? trace_hardirqs_on+0x67/0x220 [ 50.808844] kthread+0x354/0x420 [ 50.812231] ? process_one_work+0x1750/0x1750 [ 50.816727] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 50.822666] ret_from_fork+0x24/0x30 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 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 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 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 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 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