======================================================
WARNING: possible circular locking dependency detected
4.14.294-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.2/10575 is trying to acquire lock:
(&event->child_mutex){+.+.}, at: [<ffffffff81630f02>] perf_event_for_each_child+0x82/0x140 kernel/events/core.c:4690
but task is already holding lock:
(&cpuctx_mutex){+.+.}, at: [<ffffffff8163596d>] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1241
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #5 (&cpuctx_mutex){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
perf_event_init_cpu+0xb7/0x170 kernel/events/core.c:11286
perf_event_init+0x2cc/0x308 kernel/events/core.c:11333
start_kernel+0x45d/0x763 init/main.c:624
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
-> #4 (pmus_lock){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
perf_event_init_cpu+0x2c/0x170 kernel/events/core.c:11280
cpuhp_invoke_callback+0x1e6/0x1a80 kernel/cpu.c:186
cpuhp_up_callbacks kernel/cpu.c:574 [inline]
_cpu_up+0x21e/0x520 kernel/cpu.c:1193
do_cpu_up+0x9a/0x160 kernel/cpu.c:1229
smp_init+0x197/0x1ac kernel/smp.c:578
kernel_init_freeable+0x406/0x626 init/main.c:1074
kernel_init+0xd/0x16a init/main.c:1006
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
-> #3 (cpu_hotplug_lock.rw_sem){++++}:
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
cpus_read_lock+0x39/0xc0 kernel/cpu.c:297
static_key_slow_inc+0xe/0x20 kernel/jump_label.c:123
tracepoint_add_func+0x747/0xa40 kernel/tracepoint.c:269
tracepoint_probe_register_prio kernel/tracepoint.c:331 [inline]
tracepoint_probe_register+0x8c/0xc0 kernel/tracepoint.c:352
trace_event_reg+0x272/0x330 kernel/trace/trace_events.c:305
perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline]
perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline]
perf_trace_init+0x424/0xa30 kernel/trace/trace_event_perf.c:221
perf_tp_event_init+0x79/0xf0 kernel/events/core.c:8140
perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9374
perf_init_event kernel/events/core.c:9412 [inline]
perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9672
perf_event_alloc kernel/events/core.c:10042 [inline]
SYSC_perf_event_open kernel/events/core.c:10146 [inline]
SyS_perf_event_open+0x683/0x2530 kernel/events/core.c:10032
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
-> #2 (tracepoints_mutex){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
tracepoint_probe_register_prio kernel/tracepoint.c:327 [inline]
tracepoint_probe_register+0x68/0xc0 kernel/tracepoint.c:352
trace_event_reg+0x272/0x330 kernel/trace/trace_events.c:305
perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline]
perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline]
perf_trace_init+0x424/0xa30 kernel/trace/trace_event_perf.c:221
perf_tp_event_init+0x79/0xf0 kernel/events/core.c:8140
perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9374
perf_init_event kernel/events/core.c:9412 [inline]
perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9672
perf_event_alloc kernel/events/core.c:10042 [inline]
SYSC_perf_event_open kernel/events/core.c:10146 [inline]
SyS_perf_event_open+0x683/0x2530 kernel/events/core.c:10032
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
-> #1 (event_mutex){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
perf_trace_destroy+0x23/0xf0 kernel/trace/trace_event_perf.c:234
_free_event+0x321/0xe20 kernel/events/core.c:4246
free_event+0x32/0x40 kernel/events/core.c:4273
perf_event_release_kernel+0x368/0x8a0 kernel/events/core.c:4417
perf_release+0x33/0x40 kernel/events/core.c:4443
__fput+0x25f/0x7a0 fs/file_table.c:210
task_work_run+0x11f/0x190 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0xa44/0x2850 kernel/exit.c:868
SYSC_exit kernel/exit.c:934 [inline]
SyS_exit+0x1e/0x20 kernel/exit.c:932
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
-> #0 (&event->child_mutex){+.+.}:
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
perf_event_for_each_child+0x82/0x140 kernel/events/core.c:4690
perf_event_for_each kernel/events/core.c:4707 [inline]
_perf_ioctl+0x3db/0x1a60 kernel/events/core.c:4875
perf_ioctl+0x55/0x80 kernel/events/core.c:4889
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
other info that might help us debug this:
Chain exists of:
&event->child_mutex --> pmus_lock --> &cpuctx_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&cpuctx_mutex);
lock(pmus_lock);
lock(&cpuctx_mutex);
lock(&event->child_mutex);
*** DEADLOCK ***
1 lock held by syz-executor.2/10575:
#0: (&cpuctx_mutex){+.+.}, at: [<ffffffff8163596d>] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1241
stack backtrace:
CPU: 1 PID: 10575 Comm: syz-executor.2 Not tainted 4.14.294-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x281 lib/dump_stack.c:58
print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1905 [inline]
check_prevs_add kernel/locking/lockdep.c:2022 [inline]
validate_chain kernel/locking/lockdep.c:2464 [inline]
__lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
perf_event_for_each_child+0x82/0x140 kernel/events/core.c:4690
perf_event_for_each kernel/events/core.c:4707 [inline]
_perf_ioctl+0x3db/0x1a60 kernel/events/core.c:4875
perf_ioctl+0x55/0x80 kernel/events/core.c:4889
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f4f634fc409
RSP: 002b:00007f4f61e71168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4f6360ef80 RCX: 00007f4f634fc409
RDX: 0000000000000001 RSI: 0000000000002403 RDI: 0000000000000003
RBP: 00007f4f63557367 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffec84b79af R14: 00007f4f61e71300 R15: 0000000000022000
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1