======================================================
WARNING: possible circular locking dependency detected
4.14.96+ #20 Not tainted
------------------------------------------------------
syz-executor3/5138 is trying to acquire lock:
(&mm->mmap_sem){++++}, at: [<ffffffff9c0c15b4>] __might_fault+0xd4/0x1b0 mm/memory.c:4577
but task is already holding lock:
(&cpuctx_mutex){+.+.}, at: [<ffffffff9bfe7b9d>] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1240
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #5 (&cpuctx_mutex){+.+.}:
-> #4 (pmus_lock){+.+.}:
-> #3 (cpu_hotplug_lock.rw_sem){++++}:
-> #2 (&sb->s_type->i_mutex_key#10){+.+.}:
-> #1 (ashmem_mutex){+.+.}:
-> #0 (&mm->mmap_sem){++++}:
other info that might help us debug this:
Chain exists of:
&mm->mmap_sem --> pmus_lock --> &cpuctx_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&cpuctx_mutex);
lock(pmus_lock);
lock(&cpuctx_mutex);
lock(&mm->mmap_sem);
*** DEADLOCK ***
1 lock held by syz-executor3/5138:
#0: (&cpuctx_mutex){+.+.}, at: [<ffffffff9bfe7b9d>] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1240
stack backtrace:
CPU: 1 PID: 5138 Comm: syz-executor3 Not tainted 4.14.96+ #20
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
kauditd_printk_skb: 387 callbacks suppressed
audit: type=1400 audit(1548970145.866:31252): avc: denied { create } for pid=5215 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
audit: type=1400 audit(1548970145.866:31253): avc: denied { write } for pid=5215 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
audit: type=1400 audit(1548970145.926:31254): avc: denied { create } for pid=5211 comm="syz-executor4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
audit: type=1400 audit(1548970145.926:31255): avc: denied { write } for pid=5211 comm="syz-executor4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
audit: type=1400 audit(1548970145.946:31256): avc: denied { map } for pid=5220 comm="modprobe" path="/bin/kmod" dev="sda1" ino=1440 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1548970145.946:31257): avc: denied { map } for pid=5220 comm="modprobe" path="/bin/kmod" dev="sda1" ino=1440 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1548970145.956:31258): avc: denied { map } for pid=5220 comm="modprobe" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1548970145.956:31259): avc: denied { map } for pid=5220 comm="modprobe" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1548970145.976:31260): avc: denied { map } for pid=5220 comm="modprobe" path="/etc/ld.so.cache" dev="sda1" ino=2503 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1548970145.986:31261): avc: denied { map } for pid=5220 comm="modprobe" path="/lib/x86_64-linux-gnu/libkmod.so.2.1.3" dev="sda1" ino=2811 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
kauditd_printk_skb: 198 callbacks suppressed
audit: type=1400 audit(1548970150.996:31460): avc: denied { create } for pid=5297 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
audit: type=1400 audit(1548970151.016:31461): avc: denied { write } for pid=5297 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
audit: type=1400 audit(1548970151.046:31462): avc: denied { map } for pid=5314 comm="modprobe" path="/bin/kmod" dev="sda1" ino=1440 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1548970151.046:31463): avc: denied { map } for pid=5314 comm="modprobe" path="/bin/kmod" dev="sda1" ino=1440 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1548970151.046:31464): avc: denied { map } for pid=5314 comm="modprobe" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1548970151.056:31465): avc: denied { map } for pid=5314 comm="modprobe" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1548970151.066:31466): avc: denied { map } for pid=5314 comm="modprobe" path="/etc/ld.so.cache" dev="sda1" ino=2503 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1548970151.086:31467): avc: denied { map } for pid=5314 comm="modprobe" path="/lib/x86_64-linux-gnu/libkmod.so.2.1.3" dev="sda1" ino=2811 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1548970151.086:31468): avc: denied { map } for pid=5314 comm="modprobe" path="/lib/x86_64-linux-gnu/libkmod.so.2.1.3" dev="sda1" ino=2811 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1548970151.106:31469): avc: denied { map } for pid=5314 comm="modprobe" path="/lib/x86_64-linux-gnu/libc-2.13.so" dev="sda1" ino=2784 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1