syz-executor132[7981]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 in syz-executor1322179125[7fade1b52000+83000] ====================================================== syz-executor132[7983]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 WARNING: possible circular locking dependency detected 4.14.292-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor132/7981 is trying to acquire lock: (event_mutex){+.+.}, at: [] perf_trace_destroy+0x23/0xf0 kernel/trace/trace_event_perf.c:234 but task is already holding lock: (&event->child_mutex){+.+.}, at: [] perf_event_release_kernel+0x208/0x8a0 kernel/events/core.c:4405 which lock already depends on the new lock. in syz-executor1322179125[7fade1b52000+83000] the existing dependency chain (in reverse order) is: -> #5 (&event->child_mutex){+.+.}: __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_ioctl+0x471/0x1a60 kernel/events/core.c:4877 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 syz-executor132[7985]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 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 in syz-executor1322179125[7fade1b52000+83000] entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #4 (&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 syz-executor132[7987]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 -> #3 in syz-executor1322179125[7fade1b52000+83000] (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/0x161 init/main.c:1006 syz-executor132[7991]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 -> #2 in syz-executor1322179125[7fade1b52000+83000] (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 syz-executor132[7993]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb syz-executor132[7995]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 -> #1 (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 in syz-executor1322179125[7fade1b52000+83000] 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 in syz-executor1322179125[7fade1b52000+83000] 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 -> #0 ( syz-executor132[7997]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 event_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 syz-executor132[7999]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 perf_trace_destroy+0x23/0xf0 kernel/trace/trace_event_perf.c:234 _free_event+0x321/0xe20 kernel/events/core.c:4246 in syz-executor1322179125[7fade1b52000+83000] 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 in syz-executor1322179125[7fade1b52000+83000] __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 syz-executor132[8001]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xa44/0x2850 kernel/exit.c:868 do_group_exit+0x100/0x2e0 kernel/exit.c:965 get_signal+0x38d/0x1ca0 kernel/signal.c:2412 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 in syz-executor1322179125[7fade1b52000+83000] prepare_exit_to_usermode+0x1af/0x210 arch/x86/entry/common.c:199 retint_user+0x8/0x18 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-executor132/7981: #0: (&ctx->mutex){+.+.}, at: [] perf_event_release_kernel+0x1fe/0x8a0 kernel/events/core.c:4404 #1: (&event->child_mutex){+.+.}, at: [] perf_event_release_kernel+0x208/0x8a0 kernel/events/core.c:4405 stack backtrace: CPU: 1 PID: 7981 Comm: syz-executor132 Not tainted 4.14.292-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_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 do_group_exit+0x100/0x2e0 kernel/exit.c:965 get_signal+0x38d/0x1ca0 kernel/signal.c:2412 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode+0x1af/0x210 arch/x86/entry/common.c:199 retint_user+0x8/0x18 RIP: 0033:0x7fade1b90fa1 RSP: 002b:ffffffffffffffd0 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fade1b90f99 RDX: 0000000000000000 RSI: ffffffffffffffd0 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe19cff958 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fade1b54820 R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 show_signal_msg: 1597 callbacks suppressed syz-executor132[11197]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 in syz-executor1322179125[7fade1b52000+83000] syz-executor132[11199]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 in syz-executor1322179125[7fade1b52000+83000] syz-executor132[11201]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 in syz-executor1322179125[7fade1b52000+83000] syz-executor132[11203]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 in syz-executor1322179125[7fade1b52000+83000] syz-executor132[11205]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 in syz-executor1322179125[7fade1b52000+83000] syz-executor132[11207]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 in syz-executor1322179125[7fade1b52000+83000] syz-executor132[11209]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 in syz-executor1322179125[7fade1b52000+83000] syz-executor132[11211]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 in syz-executor1322179125[7fade1b52000+83000] syz-executor132[11213]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 in syz-executor1322179125[7fade1b52000+83000] syz-executor132[11215]: segfault at ffffffffffffffd0 ip 00007fade1b90fa1 sp ffffffffffffffd0 error 5 in syz-executor1322179125[7fade1b52000+83000]