audit: type=1400 audit(1549577431.323:45621): avc: denied { map } for pid=30325 comm="blkid" path="/lib/x86_64-linux-gnu/libblkid.so.1.1.0" dev="sda1" ino=2825 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 dl_rq->running_bw > dl_rq->this_bw ------------[ cut here ]------------ WARNING: CPU: 0 PID: 30352 at kernel/sched/deadline.c:125 sub_rq_bw kernel/sched/deadline.c:125 [inline] WARNING: CPU: 0 PID: 30352 at kernel/sched/deadline.c:125 switched_from_dl.cold+0x5b/0x62 kernel/sched/deadline.c:2236 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 30352 Comm: syz-executor4 Not tainted 4.14.98+ #5 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 panic+0x1d9/0x3c2 kernel/panic.c:182 __warn.cold+0x2f/0x3b kernel/panic.c:546 ====================================================== WARNING: possible circular locking dependency detected 4.14.98+ #5 Not tainted ------------------------------------------------------ syz-executor4/30352 is trying to acquire lock: ((console_sem).lock){-.-.}, at: [] down_trylock+0xe/0x60 kernel/locking/semaphore.c:136 but task is already holding lock: (&rq->lock){-.-.}, at: [] task_rq_lock+0xc8/0x330 kernel/sched/core.c:126 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&rq->lock){-.-.}: -> #1 (&p->pi_lock){-.-.}: -> #0 ((console_sem).lock){-.-.}: other info that might help us debug this: Chain exists of: (console_sem).lock --> &p->pi_lock --> &rq->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->lock); lock(&p->pi_lock); lock(&rq->lock); lock((console_sem).lock); *** DEADLOCK *** 3 locks held by syz-executor4/30352: #0: (rcu_read_lock){....}, at: [] SYSC_sched_setattr kernel/sched/core.c:4512 [inline] #0: (rcu_read_lock){....}, at: [] SyS_sched_setattr+0x1d0/0x390 kernel/sched/core.c:4498 #1: (&p->pi_lock){-.-.}, at: [] task_rq_lock+0x6a/0x330 kernel/sched/core.c:124 #2: (&rq->lock){-.-.}, at: [] task_rq_lock+0xc8/0x330 kernel/sched/core.c:126 stack backtrace: CPU: 0 PID: 30352 Comm: syz-executor4 Not tainted 4.14.98+ #5 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 print_circular_bug.isra.0.cold+0x2dc/0x425 kernel/locking/lockdep.c:1258 Shutting down cpus with NMI Kernel Offset: 0x7200000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) Rebooting in 86400 seconds..