SELinux:  unknown mount option
SELinux:  unknown mount option
======================================================
WARNING: possible circular locking dependency detected
4.14.134+ #22 Not tainted
------------------------------------------------------
syz-executor.4/20440 is trying to acquire lock:
 (&cpuctx_mutex/1){+.+.}, at: [<00000000bc32cced>] mutex_lock_double kernel/events/core.c:9909 [inline]
 (&cpuctx_mutex/1){+.+.}, at: [<00000000bc32cced>] __perf_event_ctx_lock_double kernel/events/core.c:9968 [inline]
 (&cpuctx_mutex/1){+.+.}, at: [<00000000bc32cced>] SYSC_perf_event_open kernel/events/core.c:10233 [inline]
 (&cpuctx_mutex/1){+.+.}, at: [<00000000bc32cced>] SyS_perf_event_open+0x12cf/0x2560 kernel/events/core.c:9988

but task is already holding lock:
 (&cpuctx_mutex){+.+.}, at: [<00000000fed68495>] mutex_lock_double kernel/events/core.c:9908 [inline]
 (&cpuctx_mutex){+.+.}, at: [<00000000fed68495>] __perf_event_ctx_lock_double kernel/events/core.c:9968 [inline]
 (&cpuctx_mutex){+.+.}, at: [<00000000fed68495>] SYSC_perf_event_open kernel/events/core.c:10233 [inline]
 (&cpuctx_mutex){+.+.}, at: [<00000000fed68495>] SyS_perf_event_open+0x12c2/0x2560 kernel/events/core.c:9988

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&cpuctx_mutex){+.+.}:

-> #1 (pmus_lock){+.+.}:

-> #0 (&cpuctx_mutex/1){+.+.}:

other info that might help us debug this:

Chain exists of:
  &cpuctx_mutex/1 --> pmus_lock --> &cpuctx_mutex

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&cpuctx_mutex);
                               lock(pmus_lock);
                               lock(&cpuctx_mutex);
  lock(&cpuctx_mutex/1);

 *** DEADLOCK ***

1 lock held by syz-executor.4/20440:
 #0:  (&cpuctx_mutex){+.+.}, at: [<00000000fed68495>] mutex_lock_double kernel/events/core.c:9908 [inline]
 #0:  (&cpuctx_mutex){+.+.}, at: [<00000000fed68495>] __perf_event_ctx_lock_double kernel/events/core.c:9968 [inline]
 #0:  (&cpuctx_mutex){+.+.}, at: [<00000000fed68495>] SYSC_perf_event_open kernel/events/core.c:10233 [inline]
 #0:  (&cpuctx_mutex){+.+.}, at: [<00000000fed68495>] SyS_perf_event_open+0x12c2/0x2560 kernel/events/core.c:9988

stack backtrace:
CPU: 1 PID: 20440 Comm: syz-executor.4 Not tainted 4.14.134+ #22
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
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
SELinux:  Context sys is not valid (left unmapped).
kauditd_printk_skb: 61 callbacks suppressed
audit: type=1400 audit(2000000205.260:158): avc:  denied  { relabelto } for  pid=20470 comm="syz-executor.4" name="UDP-Lite" dev="sockfs" ino=47592 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=rawip_socket permissive=1
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
nla_parse: 4 callbacks suppressed
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.