BTRFS info (device loop1): disk space caching is enabled BTRFS info (device loop1): has skinny extents ====================================================== WARNING: possible circular locking dependency detected 4.14.296-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/10744 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. 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 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 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 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 -> #3 (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/0x15b init/main.c:1006 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 -> #2 (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 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #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 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 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (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 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 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 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-executor.3/10744: #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: 10744 Comm: syz-executor.3 Not tainted 4.14.296-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 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 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 RIP: 0033:0x7f1f463b95a9 RSP: 002b:00007f1f4492c118 EFLAGS: 00000246 ORIG_RAX: 000000000000003c RAX: ffffffffffffffda RBX: 00007f1f464d9f80 RCX: 00007f1f463b95a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f1f464147b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5341b94f R14: 00007f1f4492c300 R15: 0000000000022000 BTRFS error (device loop1): open_ctree failed unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex netlink: 16 bytes leftover after parsing attributes in process `syz-executor.0'. BTRFS: device fsid e76ed352-74d7-4461-bdaa-670e3acfe92b devid 1 transid 7 /dev/loop5 EXT4-fs (loop1): Unsupported blocksize for fs encryption BTRFS error (device loop5): unsupported checksum algorithm 3 BTRFS error (device loop5): superblock checksum mismatch print_req_error: I/O error, dev loop1, sector 0 Buffer I/O error on dev loop1, logical block 0, async page read print_req_error: I/O error, dev loop1, sector 6 Buffer I/O error on dev loop1, logical block 3, async page read EXT4-fs (loop1): Unsupported blocksize for fs encryption BTRFS error (device loop2): unsupported checksum algorithm 1 BTRFS error (device loop2): superblock checksum mismatch BTRFS error (device loop5): open_ctree failed print_req_error: I/O error, dev loop1, sector 0 Buffer I/O error on dev loop1, logical block 0, async page read print_req_error: I/O error, dev loop1, sector 6 Buffer I/O error on dev loop1, logical block 3, async page read BTRFS error (device loop2): open_ctree failed BTRFS error (device loop3): unsupported checksum algorithm 1 BTRFS error (device loop3): superblock checksum mismatch audit: type=1800 audit(1667298711.854:7): pid=11471 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=14117 res=0 EXT4-fs (loop1): Unsupported blocksize for fs encryption BTRFS error (device loop3): open_ctree failed BTRFS error (device loop5): unsupported checksum algorithm 3 BTRFS error (device loop5): superblock checksum mismatch BTRFS error (device loop5): open_ctree failed EXT4-fs (loop1): Unsupported blocksize for fs encryption BTRFS error (device loop3): unsupported checksum algorithm 1 BTRFS error (device loop3): superblock checksum mismatch BTRFS error (device loop5): unsupported checksum algorithm 3 BTRFS error (device loop5): superblock checksum mismatch BTRFS error (device loop3): open_ctree failed BTRFS error (device loop3): unsupported checksum algorithm 1 BTRFS error (device loop3): superblock checksum mismatch audit: type=1800 audit(1667298712.194:8): pid=11544 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=14178 res=0 BTRFS error (device loop5): open_ctree failed BTRFS error (device loop3): open_ctree failed BTRFS error (device loop5): unsupported checksum algorithm 3 BTRFS error (device loop3): unsupported checksum algorithm 1 BTRFS error (device loop5): superblock checksum mismatch BTRFS error (device loop3): superblock checksum mismatch BTRFS error (device loop5): open_ctree failed BTRFS error (device loop3): open_ctree failed audit: type=1800 audit(1667298712.524:9): pid=11611 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=14153 res=0 BTRFS error (device loop3): unsupported checksum algorithm 1 BTRFS error (device loop3): superblock checksum mismatch BTRFS error (device loop3): open_ctree failed BTRFS error (device loop3): unsupported checksum algorithm 1 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. BTRFS error (device loop3): superblock checksum mismatch tc_ctl_action: received NO action attribs BTRFS error (device loop3): open_ctree failed BTRFS error (device loop3): unsupported checksum algorithm 1 BTRFS error (device loop3): superblock checksum mismatch audit: type=1800 audit(1667298712.874:10): pid=11677 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=14138 res=0 BTRFS error (device loop3): open_ctree failed BTRFS error (device loop1): unsupported checksum algorithm 1 BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed EXT4-fs (loop3): mounted filesystem without journal. Opts: noblock_validity,nombcache,nodelalloc,dioread_nolock,lazytime,init_itable,journal_dev=0x0000000000000007,bsdgroups,norecovery,,errors=continue F2FS-fs (loop1): Invalid blocksize (65536), supports only 4KB audit: type=1800 audit(1667298713.204:11): pid=11721 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="loop3" ino=17 res=0 F2FS-fs (loop1): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop1): invalid crc value F2FS-fs (loop1): Mounted with checkpoint version = 3e17dab0 audit: type=1804 audit(1667298713.354:12): pid=11695 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir3997082943/syzkaller.fViGLt/88/file0/bus" dev="loop1" ino=10 res=1 caif:caif_disconnect_client(): nothing to disconnect caif:caif_disconnect_client(): nothing to disconnect EXT4-fs (loop3): mounted filesystem without journal. Opts: noblock_validity,nombcache,nodelalloc,dioread_nolock,lazytime,init_itable,journal_dev=0x0000000000000007,bsdgroups,norecovery,,errors=continue BTRFS error (device loop1): unsupported checksum algorithm 1 BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed BTRFS error (device loop1): unsupported checksum algorithm 1 BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed BTRFS error (device loop1): unsupported checksum algorithm 1 BTRFS error (device loop1): superblock checksum mismatch audit: type=1804 audit(1667298714.174:13): pid=11813 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir3997082943/syzkaller.fViGLt/89/bus" dev="sda1" ino=14164 res=1 BTRFS error (device loop1): open_ctree failed audit: type=1804 audit(1667298714.194:14): pid=11766 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir1086408103/syzkaller.hXBxTn/100/bus" dev="sda1" ino=14154 res=1 BTRFS error (device loop5): unsupported checksum algorithm 1 CUSE: unknown device info "í" print_req_error: I/O error, dev loop3, sector 0 CUSE: DEVNAME unspecified EXT4-fs (loop3): mounted filesystem without journal. Opts: noblock_validity,nombcache,nodelalloc,dioread_nolock,lazytime,init_itable,journal_dev=0x0000000000000007,bsdgroups,norecovery,,errors=continue BTRFS error (device loop5): superblock checksum mismatch BTRFS error (device loop5): open_ctree failed BTRFS error (device loop5): unsupported checksum algorithm 1 EXT4-fs (loop3): mounted filesystem without journal. Opts: noblock_validity,nombcache,nodelalloc,dioread_nolock,lazytime,init_itable,journal_dev=0x0000000000000007,bsdgroups,norecovery,,errors=continue BTRFS error (device loop5): superblock checksum mismatch BTRFS error (device loop5): open_ctree failed BTRFS error (device loop5): unsupported checksum algorithm 1 BTRFS error (device loop5): superblock checksum mismatch audit: type=1800 audit(1667298714.564:15): pid=11864 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="loop3" ino=17 res=0 audit: type=1804 audit(1667298714.604:16): pid=11884 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir1086408103/syzkaller.hXBxTn/101/bus" dev="sda1" ino=14211 res=1 BTRFS error (device loop5): open_ctree failed