audit: type=1400 audit(1563492938.156:7): avc:  denied  { map } for  pid=1833 comm="syz-executor823" path="/root/syz-executor823820887" dev="sda1" ino=16461 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
Can't find any breakpoint slot
------------[ cut here ]------------
WARNING: CPU: 0 PID: 23412 at arch/x86/kernel/hw_breakpoint.c:121 arch_install_hw_breakpoint.cold+0x13/0x1f /arch/x86/kernel/hw_breakpoint.c:121
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 23412 Comm: syz-executor823 Not tainted 4.14.133+ #17
Call Trace:
 __dump_stack /lib/dump_stack.c:17 [inline]
 dump_stack+0xca/0x134 /lib/dump_stack.c:53
 panic+0x1ea/0x3d3 /kernel/panic.c:182
 __warn.cold+0x2f/0x3a /kernel/panic.c:546

======================================================
WARNING: possible circular locking dependency detected
4.14.133+ #17 Not tainted
------------------------------------------------------
syz-executor823/23412 is trying to acquire lock:
 ((console_sem).lock){-...}, at: [<        (ptrval)>] down_trylock+0xe/0x60 /kernel/locking/semaphore.c:136

but task is already holding lock:
 (&ctx->lock){....}, at: [<        (ptrval)>] perf_ctx_lock /kernel/events/core.c:157 [inline]
 (&ctx->lock){....}, at: [<        (ptrval)>] perf_event_context_sched_in /kernel/events/core.c:3265 [inline]
 (&ctx->lock){....}, at: [<        (ptrval)>] __perf_event_task_sched_in+0x2c3/0x440 /kernel/events/core.c:3323

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&ctx->lock){....}:

-> #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 --> &rq->lock --> &ctx->lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ctx->lock);
                               lock(&rq->lock);
                               lock(&ctx->lock);
  lock((console_sem).lock);

 *** DEADLOCK ***

2 locks held by syz-executor823/23412:
 #0:  (&cpuctx_lock){....}, at: [<        (ptrval)>] perf_ctx_lock /kernel/events/core.c:155 [inline]
 #0:  (&cpuctx_lock){....}, at: [<        (ptrval)>] perf_event_context_sched_in /kernel/events/core.c:3265 [inline]
 #0:  (&cpuctx_lock){....}, at: [<        (ptrval)>] __perf_event_task_sched_in+0x2b2/0x440 /kernel/events/core.c:3323
 #1:  (&ctx->lock){....}, at: [<        (ptrval)>] perf_ctx_lock /kernel/events/core.c:157 [inline]
 #1:  (&ctx->lock){....}, at: [<        (ptrval)>] perf_event_context_sched_in /kernel/events/core.c:3265 [inline]
 #1:  (&ctx->lock){....}, at: [<        (ptrval)>] __perf_event_task_sched_in+0x2c3/0x440 /kernel/events/core.c:3323

stack backtrace:
CPU: 0 PID: 23412 Comm: syz-executor823 Not tainted 4.14.133+ #17
Call Trace:
 __dump_stack /lib/dump_stack.c:17 [inline]
 dump_stack+0xca/0x134 /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: 0x14e00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
Rebooting in 86400 seconds..