syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 ====================================================== WARNING: possible circular locking dependency detected 4.14.277-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/11329 is trying to acquire lock: (&event->child_mutex){+.+.}, at: [] perf_event_read_value+0x78/0x410 kernel/events/core.c:4455 but task is already holding lock: syz-executor.0 (11315): drop_caches: 0 (&cpuctx_mutex){+.+.}, at: [] 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:11255 perf_event_init+0x2cc/0x308 kernel/events/core.c:11302 start_kernel+0x46a/0x770 init/main.c:620 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 syz-executor.0 (11315): drop_caches: 0 perf_event_init_cpu+0x2c/0x170 kernel/events/core.c:11249 cpuhp_invoke_callback+0x1e6/0x1a80 kernel/cpu.c:185 cpuhp_up_callbacks kernel/cpu.c:573 [inline] _cpu_up+0x21e/0x520 kernel/cpu.c:1192 do_cpu_up+0x9a/0x160 kernel/cpu.c:1228 smp_init+0x197/0x1ac kernel/smp.c:578 kernel_init_freeable+0x406/0x626 init/main.c:1070 kernel_init+0xd/0x162 init/main.c:1002 syz-executor.0 (11315): drop_caches: 0 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:296 syz-executor.0 (11315): drop_caches: 0 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 syz-executor.0 (11315): drop_caches: 0 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:10025 [inline] SYSC_perf_event_open kernel/events/core.c:10129 [inline] SyS_perf_event_open+0x67f/0x24b0 kernel/events/core.c:10015 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb syz-executor.0 (11315): drop_caches: 0 -> #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 syz-executor.0 (11315): drop_caches: 0 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 syz-executor.0 (11315): drop_caches: 0 perf_event_alloc kernel/events/core.c:10025 [inline] SYSC_perf_event_open kernel/events/core.c:10129 [inline] SyS_perf_event_open+0x67f/0x24b0 kernel/events/core.c:10015 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #1 syz-executor.0 (11315): drop_caches: 0 (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 syz-executor.0 (11315): drop_caches: 0 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 syz-executor.0 (11315): drop_caches: 0 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 syz-executor.0 (11315): drop_caches: 0 perf_event_read_value+0x78/0x410 kernel/events/core.c:4455 perf_read_one kernel/events/core.c:4577 [inline] __perf_read kernel/events/core.c:4628 [inline] perf_read+0x3e2/0x7c0 kernel/events/core.c:4641 __vfs_read+0xe4/0x620 fs/read_write.c:411 vfs_read+0x139/0x340 fs/read_write.c:447 SYSC_read fs/read_write.c:574 [inline] SyS_read+0xf2/0x210 fs/read_write.c:567 syz-executor.0 (11315): drop_caches: 0 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.5/11329: #0: syz-executor.0 (11315): drop_caches: 0 (&cpuctx_mutex){+.+.}, at: [] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1241 stack backtrace: CPU: 1 PID: 11329 Comm: syz-executor.5 Not tainted 4.14.277-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: syz-executor.0 (11315): drop_caches: 0 __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 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 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-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 perf_event_read_value+0x78/0x410 kernel/events/core.c:4455 perf_read_one kernel/events/core.c:4577 [inline] __perf_read kernel/events/core.c:4628 [inline] perf_read+0x3e2/0x7c0 kernel/events/core.c:4641 __vfs_read+0xe4/0x620 fs/read_write.c:411 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 vfs_read+0x139/0x340 fs/read_write.c:447 SYSC_read fs/read_write.c:574 [inline] SyS_read+0xf2/0x210 fs/read_write.c:567 syz-executor.0 (11315): drop_caches: 0 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 syz-executor.0 (11315): drop_caches: 0 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f9e2d9ab0e9 RSP: 002b:00007f9e2c320168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f9e2dabdf60 RCX: 00007f9e2d9ab0e9 syz-executor.0 (11315): drop_caches: 0 RDX: 0000000000002020 RSI: 00000000200002c0 RDI: 0000000000000003 RBP: 00007f9e2da0508d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd187e15bf R14: 00007f9e2c320300 R15: 0000000000022000 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11315): drop_caches: 0 syz-executor.0 (11373): drop_caches: 0 syz-executor.0 (11373): 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drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 syz-executor.0 (11390): drop_caches: 0 x_tables: ip6_tables: icmp6 match: only valid for protocol 58 x_tables: ip6_tables: icmp6 match: only valid for protocol 58 x_tables: ip6_tables: icmp6 match: only valid for protocol 58 x_tables: ip6_tables: icmp6 match: only valid for protocol 58 serio: Serial port pts0 UHID_CREATE from different security context by process 177 (syz-executor.1), this is not allowed. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. f2fs_msg: 14 callbacks suppressed F2FS-fs (loop3): Found nat_bits in checkpoint netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. serio: Serial port pts0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. F2FS-fs (loop3): Mounted with checkpoint version = 7ad43cd7 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. serio: Serial port pts1 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. F2FS-fs (loop3): Found nat_bits in checkpoint netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. serio: Serial port pts0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. F2FS-fs (loop3): Mounted with checkpoint version = 7ad43cd7 serio: Serial port pts1 serio: Serial port pts2 F2FS-fs (loop3): Found nat_bits in checkpoint serio: Serial port pts0 serio: Serial port pts3 serio: Serial port pts4 F2FS-fs (loop3): Mounted with checkpoint version = 7ad43cd7 F2FS-fs (loop3): Found nat_bits in checkpoint serio: Serial port pts1 serio: Serial port pts2 F2FS-fs (loop3): Mounted with checkpoint version = 7ad43cd7 serio: Serial port pts0 serio: Serial port pts3 serio: Serial port pts4 serio: Serial port pts5 serio: Serial port pts1 serio: Serial port pts2 serio: Serial port pts0 serio: Serial port pts3 serio: Serial port pts4 serio: Serial port pts5 serio: Serial port pts0 capability: warning: `syz-executor.1' uses deprecated v2 capabilities in a way that may be insecure serio: Serial port pts1 serio: Serial port pts2 serio: Serial port pts0 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'. Zero length message leads to an empty skb netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'. unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'.