ptrace attach of "/root/syz-executor.1"[15597] was attempted by "/root/syz-executor.1"[15600] ====================================================== WARNING: possible circular locking dependency detected 4.14.162-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/15609 is trying to acquire lock: (&event->child_mutex){+.+.}, at: [] perf_read_group kernel/events/core.c:4536 [inline] (&event->child_mutex){+.+.}, at: [] __perf_read kernel/events/core.c:4618 [inline] (&event->child_mutex){+.+.}, at: [] perf_read+0x2c0/0x820 kernel/events/core.c:4633 but task is already holding lock: (&cpuctx_mutex){+.+.}, at: [] perf_event_ctx_lock_nested+0x150/0x2c0 kernel/events/core.c:1235 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&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:620 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 -> #4 (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:573 [inline] _cpu_up+0x228/0x530 kernel/cpu.c:1135 do_cpu_up kernel/cpu.c:1170 [inline] do_cpu_up+0xa6/0x160 kernel/cpu.c:1142 cpu_up+0x1b/0x20 kernel/cpu.c:1178 smp_init+0x157/0x170 kernel/smp.c:578 kernel_init_freeable+0x30b/0x532 init/main.c:1066 kernel_init+0x12/0x162 init/main.c:998 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 -> #3 (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+0xd92/0x25c0 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 -> #2 (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+0xd92/0x25c0 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 (event_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_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+0x7be/0x2c80 kernel/exit.c:854 do_group_exit+0x111/0x330 kernel/exit.c:951 SYSC_exit_group kernel/exit.c:962 [inline] SyS_exit_group+0x1d/0x20 kernel/exit.c:960 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 (&event->child_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_read_group kernel/events/core.c:4536 [inline] __perf_read kernel/events/core.c:4618 [inline] perf_read+0x2c0/0x820 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 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.4/15609: #0: (&cpuctx_mutex){+.+.}, at: [] perf_event_ctx_lock_nested+0x150/0x2c0 kernel/events/core.c:1235 stack backtrace: CPU: 0 PID: 15609 Comm: syz-executor.4 Not tainted 4.14.162-syzkaller #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+0x142/0x197 lib/dump_stack.c:58 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_read_group kernel/events/core.c:4536 [inline] __perf_read kernel/events/core.c:4618 [inline] perf_read+0x2c0/0x820 kernel/events/core.c:4633 __vfs_read+0x105/0x6a0 fs/read_write.c:411 kobject: 'loop2' (ffff8880a4147720): kobject_uevent_env kobject: 'loop2' (ffff8880a4147720): fill_kobj_path: path = '/devices/virtual/block/loop2' 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 RIP: 0033:0x45af49 RSP: 002b:00007f2c70f99c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045af49 RDX: 0000000000000093 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2c70f9a6d4 R13: 00000000004c8176 R14: 00000000004e1d08 R15: 00000000ffffffff kobject: 'loop1' (ffff8880a40cd6a0): kobject_uevent_env kobject: 'loop1' (ffff8880a40cd6a0): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (ffff8880505ba3a0): kobject_uevent_env kobject: 'loop0' (ffff8880505ba3a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env kobject: 'loop3' (ffff8880a419f7a0): kobject_uevent_env kobject: 'kvm' (ffff8880a6490490): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop3' (ffff8880a419f7a0): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env kobject: 'kvm' (ffff8880a6490490): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop2' (ffff8880a4147720): kobject_uevent_env kobject: 'loop2' (ffff8880a4147720): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (ffff8880a40cd6a0): kobject_uevent_env kobject: 'loop1' (ffff8880a40cd6a0): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (ffff8880a42200e0): kobject_uevent_env kobject: 'loop5' (ffff8880a42200e0): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (ffff8880a40cd6a0): kobject_uevent_env kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env kobject: 'loop1' (ffff8880a40cd6a0): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'kvm' (ffff8880a6490490): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env kobject: 'kvm' (ffff8880a6490490): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop5' (ffff8880a42200e0): kobject_uevent_env kobject: 'loop5' (ffff8880a42200e0): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (ffff8880a40cd6a0): kobject_uevent_env kobject: 'loop1' (ffff8880a40cd6a0): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (ffff8880a42200e0): kobject_uevent_env kobject: 'loop5' (ffff8880a42200e0): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (ffff8880505ba3a0): kobject_uevent_env kobject: 'loop0' (ffff8880505ba3a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (ffff8880a4147720): kobject_uevent_env kobject: 'loop2' (ffff8880a4147720): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (ffff8880505ba3a0): kobject_uevent_env kobject: 'loop0' (ffff8880505ba3a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (ffff8880a419f7a0): kobject_uevent_env kobject: 'loop3' (ffff8880a419f7a0): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env kobject: 'kvm' (ffff8880a6490490): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop2' (ffff8880a4147720): kobject_uevent_env kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env kobject: 'kvm' (ffff8880a6490490): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop2' (ffff8880a4147720): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (ffff8880a40cd6a0): kobject_uevent_env kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env kobject: 'kvm' (ffff8880a6490490): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop1' (ffff8880a40cd6a0): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env kobject: 'loop2' (ffff8880a4147720): kobject_uevent_env kobject: 'kvm' (ffff8880a6490490): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop2' (ffff8880a4147720): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (ffff8880a40cd6a0): kobject_uevent_env kobject: 'loop1' (ffff8880a40cd6a0): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (ffff8880a4147720): kobject_uevent_env kobject: 'loop2' (ffff8880a4147720): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (ffff8880a42200e0): kobject_uevent_env kobject: 'loop5' (ffff8880a42200e0): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (ffff8880505ba3a0): kobject_uevent_env kobject: 'loop0' (ffff8880505ba3a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (ffff8880a419f7a0): kobject_uevent_env kobject: 'loop3' (ffff8880a419f7a0): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env kobject: 'loop1' (ffff8880a40cd6a0): kobject_uevent_env kobject: 'kvm' (ffff8880a6490490): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env kobject: 'loop1' (ffff8880a40cd6a0): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'kvm' (ffff8880a6490490): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop2' (ffff8880a4147720): kobject_uevent_env kobject: 'loop2' (ffff8880a4147720): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (ffff8880a419f7a0): kobject_uevent_env kobject: 'loop3' (ffff8880a419f7a0): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env kobject: 'loop1' (ffff8880a40cd6a0): kobject_uevent_env kobject: 'loop1' (ffff8880a40cd6a0): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'kvm' (ffff8880a6490490): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop5' (ffff8880a42200e0): kobject_uevent_env kobject: 'loop5' (ffff8880a42200e0): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env kobject: 'kvm' (ffff8880a6490490): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop2' (ffff8880a4147720): kobject_uevent_env kobject: 'loop2' (ffff8880a4147720): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (ffff8880a419f7a0): kobject_uevent_env kobject: 'loop3' (ffff8880a419f7a0): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (ffff8880a4147720): kobject_uevent_env kobject: 'loop2' (ffff8880a4147720): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (ffff8880a40cd6a0): kobject_uevent_env kobject: 'loop1' (ffff8880a40cd6a0): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (ffff8880a4147720): kobject_uevent_env kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env kobject: 'loop2' (ffff8880a4147720): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'kvm' (ffff8880a6490490): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop5' (ffff8880a42200e0): kobject_uevent_env kobject: 'loop5' (ffff8880a42200e0): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (ffff8880505ba3a0): kobject_uevent_env kobject: 'loop0' (ffff8880505ba3a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (ffff8880a42200e0): kobject_uevent_env kobject: 'loop5' (ffff8880a42200e0): fill_kobj_path: path = '/devices/virtual/block/loop5' encrypted_key: insufficient parameters specified kobject: 'loop2' (ffff8880a4147720): kobject_uevent_env kobject: 'loop2' (ffff8880a4147720): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env kobject: 'kvm' (ffff8880a6490490): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop0' (ffff8880505ba3a0): kobject_uevent_env kobject: 'loop0' (ffff8880505ba3a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (ffff8880a42200e0): kobject_uevent_env kobject: 'loop5' (ffff8880a42200e0): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (ffff8880a419f7a0): kobject_uevent_env kobject: 'loop3' (ffff8880a419f7a0): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'kvm' (ffff8880a6490490): kobject_uevent_env