======================================================
WARNING: possible circular locking dependency detected
4.14.151 #0 Not tainted
------------------------------------------------------
syz-executor692/7995 is trying to acquire lock:
 (event_mutex){+.+.}, at: [<ffffffff8162d678>] perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234

but task is already holding lock:
 (&event->child_mutex){+.+.}, at: [<ffffffff816d5867>] perf_event_release_kernel+0x207/0x880 kernel/events/core.c:4397

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #5 (&event->child_mutex){+.+.}:
       lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
       __mutex_lock_common kernel/locking/mutex.c:756 [inline]
       __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
       perf_event_read_value+0x7a/0x410 kernel/events/core.c:4447
       perf_read_one kernel/events/core.c:4569 [inline]
       __perf_read kernel/events/core.c:4620 [inline]
       perf_read+0x40c/0x820 kernel/events/core.c:4633
       __vfs_read+0x105/0x6a0 fs/read_write.c:411
       vfs_read+0x137/0x350 fs/read_write.c:447
       SYSC_read fs/read_write.c:574 [inline]
       SyS_read+0xfd/0x230 fs/read_write.c:567
       do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #4 (&cpuctx_mutex){+.+.}:
       lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
       __mutex_lock_common kernel/locking/mutex.c:756 [inline]
       __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
       perf_event_init_cpu+0xc2/0x170 kernel/events/core.c:11223
       perf_event_init+0x2d8/0x31a kernel/events/core.c:11270
       start_kernel+0x3b6/0x6fd init/main.c:621
       x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:399
       x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:380
       secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240

-> #3 (pmus_lock){+.+.}:
       lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
       __mutex_lock_common kernel/locking/mutex.c:756 [inline]
       __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
       perf_event_init_cpu+0x2f/0x170 kernel/events/core.c:11217
       cpuhp_invoke_callback+0x1ea/0x1ab0 kernel/cpu.c:184
       cpuhp_up_callbacks kernel/cpu.c:572 [inline]
       _cpu_up+0x228/0x530 kernel/cpu.c:1134
       do_cpu_up+0x121/0x150 kernel/cpu.c:1169
       cpu_up+0x1b/0x20 kernel/cpu.c:1177
       smp_init+0x157/0x170 kernel/smp.c:578
       kernel_init_freeable+0x30b/0x532 init/main.c:1067
       kernel_init+0x12/0x162 init/main.c:999
       ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

-> #2 (cpu_hotplug_lock.rw_sem){++++}:
       lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
       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+0x3d/0xc0 kernel/cpu.c:295
       static_key_slow_inc+0x13/0x30 kernel/jump_label.c:123
       tracepoint_add_func kernel/tracepoint.c:223 [inline]
       tracepoint_probe_register_prio+0x4d6/0x6d0 kernel/tracepoint.c:283
       tracepoint_probe_register+0x2b/0x40 kernel/tracepoint.c:304
       trace_event_reg+0x277/0x330 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+0x449/0xaa0 kernel/trace/trace_event_perf.c:221
       perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:8106
       perf_try_init_event+0x164/0x200 kernel/events/core.c:9342
       perf_init_event kernel/events/core.c:9380 [inline]
       perf_event_alloc.part.0+0xd90/0x25b0 kernel/events/core.c:9640
       perf_event_alloc kernel/events/core.c:9993 [inline]
       SYSC_perf_event_open+0xad1/0x2690 kernel/events/core.c:10097
       SyS_perf_event_open+0x34/0x40 kernel/events/core.c:9983
       do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #1 (tracepoints_mutex){+.+.}:
       lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
       __mutex_lock_common kernel/locking/mutex.c:756 [inline]
       __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
       tracepoint_probe_register_prio+0x36/0x6d0 kernel/tracepoint.c:279
       tracepoint_probe_register+0x2b/0x40 kernel/tracepoint.c:304
       trace_event_reg+0x277/0x330 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+0x449/0xaa0 kernel/trace/trace_event_perf.c:221
       perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:8106
       perf_try_init_event+0x164/0x200 kernel/events/core.c:9342
       perf_init_event kernel/events/core.c:9380 [inline]
       perf_event_alloc.part.0+0xd90/0x25b0 kernel/events/core.c:9640
       perf_event_alloc kernel/events/core.c:9993 [inline]
       SYSC_perf_event_open+0xad1/0x2690 kernel/events/core.c:10097
       SyS_perf_event_open+0x34/0x40 kernel/events/core.c:9983
       do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #0 (event_mutex){+.+.}:
       check_prev_add kernel/locking/lockdep.c:1901 [inline]
       check_prevs_add kernel/locking/lockdep.c:2018 [inline]
       validate_chain kernel/locking/lockdep.c:2460 [inline]
       __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
       lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
       __mutex_lock_common kernel/locking/mutex.c:756 [inline]
       __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
       perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234
       tp_perf_event_destroy+0x16/0x20 kernel/events/core.c:8090
       _free_event+0x330/0xe70 kernel/events/core.c:4238
       free_event+0x38/0x50 kernel/events/core.c:4265
       perf_event_release_kernel+0x364/0x880 kernel/events/core.c:4409
       perf_release+0x37/0x50 kernel/events/core.c:4435
       __fput+0x275/0x7a0 fs/file_table.c:210
       ____fput+0x16/0x20 fs/file_table.c:244
       task_work_run+0x114/0x190 kernel/task_work.c:113
       exit_task_work include/linux/task_work.h:22 [inline]
       do_exit+0x7df/0x2c10 kernel/exit.c:874
       do_group_exit+0x111/0x330 kernel/exit.c:977
       get_signal+0x381/0x1cd0 kernel/signal.c:2409
       do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814
       exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160
       prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
       syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
       do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
       entry_SYSCALL_64_after_hwframe+0x42/0xb7

other info that might help us debug this:

Chain exists of:
  event_mutex --> &cpuctx_mutex --> &event->child_mutex

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&event->child_mutex);
                               lock(&cpuctx_mutex);
                               lock(&event->child_mutex);
  lock(event_mutex);

 *** DEADLOCK ***

2 locks held by syz-executor692/7995:
 #0:  (&ctx->mutex){+.+.}, at: [<ffffffff816d585d>] perf_event_release_kernel+0x1fd/0x880 kernel/events/core.c:4396
 #1:  (&event->child_mutex){+.+.}, at: [<ffffffff816d5867>] perf_event_release_kernel+0x207/0x880 kernel/events/core.c:4397

stack backtrace:
CPU: 0 PID: 7995 Comm: syz-executor692 Not tainted 4.14.151 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x197 lib/dump_stack.c:53
 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1258
 check_prev_add kernel/locking/lockdep.c:1901 [inline]
 check_prevs_add kernel/locking/lockdep.c:2018 [inline]
 validate_chain kernel/locking/lockdep.c:2460 [inline]
 __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
 __mutex_lock_common kernel/locking/mutex.c:756 [inline]
 __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
 perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234
 tp_perf_event_destroy+0x16/0x20 kernel/events/core.c:8090
 _free_event+0x330/0xe70 kernel/events/core.c:4238
 free_event+0x38/0x50 kernel/events/core.c:4265
 perf_event_release_kernel+0x364/0x880 kernel/events/core.c:4409
 perf_release+0x37/0x50 kernel/events/core.c:4435
 __fput+0x275/0x7a0 fs/file_table.c:210
 ____fput+0x16/0x20 fs/file_table.c:244
 task_work_run+0x114/0x190 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x7df/0x2c10 kernel/exit.c:874
 do_group_exit+0x111/0x330 kernel/exit.c:977
 get_signal+0x381/0x1cd0 kernel/signal.c:2409
 do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814
 exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4483e9
RSP: 002b:00007f3abe43ccf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006ddc38 RCX: 00000000004483e9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006ddc38
RBP: 00000000006ddc30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc3c
R13: 00007ffcd1da45ef R14: 00007f3abe43d9c0 R15: 20c49ba5e353f7cf