====================================================== WARNING: possible circular locking dependency detected 4.14.213-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/4284 is trying to acquire lock: (&event->child_mutex){+.+.}, at: [] perf_read_group kernel/events/core.c:4542 [inline] (&event->child_mutex){+.+.}, at: [] __perf_read kernel/events/core.c:4624 [inline] (&event->child_mutex){+.+.}, at: [] perf_read+0x2a2/0x7c0 kernel/events/core.c:4639 but task is already holding lock: (&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:11250 perf_event_init+0x2cc/0x308 kernel/events/core.c:11297 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 perf_event_init_cpu+0x2c/0x170 kernel/events/core.c:11244 cpuhp_invoke_callback+0x1e6/0x1a80 kernel/cpu.c:184 cpuhp_up_callbacks kernel/cpu.c:572 [inline] _cpu_up+0x219/0x500 kernel/cpu.c:1144 do_cpu_up+0x9a/0x160 kernel/cpu.c:1179 smp_init+0x197/0x1ac kernel/smp.c:578 kernel_init_freeable+0x3f4/0x614 init/main.c:1068 kernel_init+0xd/0x165 init/main.c:1000 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:295 static_key_slow_inc+0xe/0x20 kernel/jump_label.c:123 tracepoint_add_func+0x517/0x750 kernel/tracepoint.c:223 tracepoint_probe_register_prio kernel/tracepoint.c:283 [inline] tracepoint_probe_register+0x8c/0xc0 kernel/tracepoint.c:304 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:8138 perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9369 perf_init_event kernel/events/core.c:9407 [inline] perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9667 perf_event_alloc kernel/events/core.c:10020 [inline] SYSC_perf_event_open kernel/events/core.c:10124 [inline] SyS_perf_event_open+0x67f/0x24b0 kernel/events/core.c:10010 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:279 [inline] tracepoint_probe_register+0x68/0xc0 kernel/tracepoint.c:304 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:8138 perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9369 perf_init_event kernel/events/core.c:9407 [inline] perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9667 perf_event_alloc kernel/events/core.c:10020 [inline] SYSC_perf_event_open kernel/events/core.c:10124 [inline] SyS_perf_event_open+0x67f/0x24b0 kernel/events/core.c:10010 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:4244 free_event+0x32/0x40 kernel/events/core.c:4271 perf_event_release_kernel+0x368/0x8a0 kernel/events/core.c:4415 perf_release+0x33/0x40 kernel/events/core.c:4441 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 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_read_group kernel/events/core.c:4542 [inline] __perf_read kernel/events/core.c:4624 [inline] perf_read+0x2a2/0x7c0 kernel/events/core.c:4639 __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 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.2/4284: #0: (&cpuctx_mutex){+.+.}, at: [] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1241 stack backtrace: CPU: 0 PID: 4284 Comm: syz-executor.2 Not tainted 4.14.213-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+0x1b2/0x283 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_read_group kernel/events/core.c:4542 [inline] __perf_read kernel/events/core.c:4624 [inline] perf_read+0x2a2/0x7c0 kernel/events/core.c:4639 __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 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45e219 RSP: 002b:00007f9d12c25c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000001000 RSI: 0000000020000400 RDI: 0000000000000003 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffc8d91429f R14: 00007f9d12c269c0 R15: 000000000119bf8c EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue Bearer rejected, not supported in standalone mode Bearer rejected, not supported in standalone mode EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): bad geometry: block count 512 exceeds size of device (96 blocks) EXT4-fs (loop4): bad geometry: block count 512 exceeds size of device (96 blocks) EXT4-fs (loop4): bad geometry: block count 512 exceeds size of device (96 blocks) EXT4-fs (loop1): bad geometry: block count 512 exceeds size of device (96 blocks) print_req_error: I/O error, dev loop1, sector 24 EXT4-fs (loop1): bad geometry: block count 512 exceeds size of device (96 blocks) EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): bad geometry: block count 512 exceeds size of device (96 blocks) EXT4-fs (loop4): mount failed EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop4): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): mount failed EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop4): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): mount failed EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop4): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): mount failed EXT4-fs (loop4): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): mount failed EXT4-fs (loop4): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): mount failed EXT4-fs (loop4): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): mount failed EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop4): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): mount failed EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop4): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): mount failed Quota error (device loop4): v2_read_file_info: Free block number too big (0 >= 0). EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop4): mount failed EXT4-fs (loop1): mount failed Quota error (device loop4): v2_read_file_info: Free block number too big (0 >= 0). Quota error (device loop1): v2_read_file_info: Free block number too big (0 >= 0). EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs (loop1): mount failed EXT4-fs (loop4): mount failed Quota error (device loop1): v2_read_file_info: Free block number too big (0 >= 0). Quota error (device loop4): v2_read_file_info: Free block number too big (0 >= 0). EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs (loop1): mount failed EXT4-fs (loop4): mount failed Quota error (device loop1): v2_read_file_info: Free block number too big (0 >= 0). Quota error (device loop4): v2_read_file_info: Free block number too big (0 >= 0). EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs (loop4): mount failed EXT4-fs (loop1): mount failed Quota error (device loop4): v2_read_file_info: Free block number too big (0 >= 0). EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. Quota error (device loop1): v2_read_file_info: Free block number too big (0 >= 0). EXT4-fs (loop4): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs (loop1): mount failed Quota error (device loop4): v2_read_file_info: Free block number too big (0 >= 0). EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs (loop4): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs (loop1): mount failed netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs (loop4): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs (loop1): mount failed EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs (loop4): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs (loop1): mount failed EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs (loop4): mount failed tc_ctl_action: received NO action attribs EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs (loop1): mount failed tc_ctl_action: received NO action attribs EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. tc_ctl_action: received NO action attribs EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs (loop4): mount failed EXT4-fs (loop1): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs (loop1): mount failed EXT4-fs (loop4): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. print_req_error: I/O error, dev loop7, sector 580 Buffer I/O error on dev loop7, logical block 145, lost async page write EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs (loop4): mount failed EXT4-fs (loop1): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix. EXT4-fs warning (device loop4): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): mount failed EXT4-fs (loop4): mount failed FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 EXT4-fs warning (device loop1): ext4_enable_quotas:5755: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. CPU: 0 PID: 5757 Comm: syz-executor.2 Not tainted 4.14.213-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+0x1b2/0x283 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10a/0x154 lib/fault-inject.c:149 should_failslab+0xd6/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc_node mm/slab.c:3297 [inline] kmem_cache_alloc_node+0x263/0x410 mm/slab.c:3640 __alloc_skb+0x5c/0x510 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:980 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1159 [inline] netlink_sendmsg+0x901/0xb80 net/netlink/af_netlink.c:1853 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062