====================================================== WARNING: possible circular locking dependency detected 4.14.295-syzkaller #0 Not tainted ------------------------------------------------------ netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'. syz-executor.0/10291 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_event_for_each kernel/events/core.c:4707 [inline] _perf_ioctl+0x3db/0x1a60 kernel/events/core.c:4875 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/0x161 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.0/10291: #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: 10291 Comm: syz-executor.0 Not tainted 4.14.295-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 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: 0033:0x7f2cd2e885a9 RSP: 002b:00007f2cd17fb118 EFLAGS: 00000246 ORIG_RAX: 000000000000003c RAX: ffffffffffffffda RBX: 00007f2cd2fa8f80 RCX: 00007f2cd2e885a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f2cd2ee3580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff5fafa69f R14: 00007f2cd17fb300 R15: 0000000000022000 TCP: request_sock_TCP: Possible SYN flooding on port 2. Sending cookies. Check SNMP counters. TCP: request_sock_TCP: Possible SYN flooding on port 2. Sending cookies. Check SNMP counters. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'. TCP: request_sock_TCP: Possible SYN flooding on port 2. Sending cookies. Check SNMP counters. UDF-fs: error (device loop3): udf_process_sequence: Block 100 of volume descriptor sequence is corrupted or we could not read it TCP: request_sock_TCP: Possible SYN flooding on port 2. Sending cookies. Check SNMP counters. UDF-fs: error (device loop3): udf_process_sequence: Block 2016 of volume descriptor sequence is corrupted or we could not read it audit: type=1800 audit(1665686584.832:3): pid=10437 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="sda1" ino=13920 res=0 UDF-fs: error (device loop3): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop2): udf_process_sequence: Block 100 of volume descriptor sequence is corrupted or we could not read it UDF-fs: error (device loop2): udf_process_sequence: Block 2016 of volume descriptor sequence is corrupted or we could not read it audit: type=1804 audit(1665686585.022:4): pid=10466 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir3264162930/syzkaller.MzajmS/47/bus" dev="sda1" ino=13973 res=1 UDF-fs: error (device loop3): udf_process_sequence: Block 100 of volume descriptor sequence is corrupted or we could not read it UDF-fs: error (device loop3): udf_process_sequence: Block 2016 of volume descriptor sequence is corrupted or we could not read it netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. UDF-fs: error (device loop3): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop2): udf_read_tagged: read failed, block=512, location=512 audit: type=1800 audit(1665686585.122:5): pid=10482 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="sda1" ino=13884 res=0 print_req_error: I/O error, dev loop3, sector 0 UDF-fs: error (device loop3): udf_process_sequence: Block 100 of volume descriptor sequence is corrupted or we could not read it UDF-fs: error (device loop2): udf_process_sequence: Block 100 of volume descriptor sequence is corrupted or we could not read it Zero length message leads to an empty skb UDF-fs: error (device loop2): udf_process_sequence: Block 2016 of volume descriptor sequence is corrupted or we could not read it UDF-fs: error (device loop3): udf_process_sequence: Block 2016 of volume descriptor sequence is corrupted or we could not read it UDF-fs: error (device loop2): udf_read_tagged: read failed, block=512, location=512 audit: type=1800 audit(1665686585.352:6): pid=10531 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="sda1" ino=13958 res=0 UDF-fs: error (device loop3): udf_read_tagged: read failed, block=512, location=512 audit: type=1804 audit(1665686585.352:7): pid=10532 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir3264162930/syzkaller.MzajmS/48/bus" dev="sda1" ino=13972 res=1 print_req_error: I/O error, dev loop2, sector 0 UDF-fs: error (device loop2): udf_process_sequence: Block 100 of volume descriptor sequence is corrupted or we could not read it UDF-fs: error (device loop2): udf_process_sequence: Block 2016 of volume descriptor sequence is corrupted or we could not read it UDF-fs: error (device loop2): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop3): udf_process_sequence: Block 100 of volume descriptor sequence is corrupted or we could not read it audit: type=1804 audit(1665686585.602:8): pid=10577 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir3264162930/syzkaller.MzajmS/49/bus" dev="sda1" ino=13884 res=1 UDF-fs: error (device loop3): udf_process_sequence: Block 2016 of volume descriptor sequence is corrupted or we could not read it print_req_error: I/O error, dev loop2, sector 0 UDF-fs: error (device loop3): udf_read_tagged: read failed, block=512, location=512 audit: type=1800 audit(1665686585.682:9): pid=10568 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="sda1" ino=13912 res=0 UDF-fs: error (device loop2): udf_process_sequence: Block 100 of volume descriptor sequence is corrupted or we could not read it Dev loop3: unable to read RDB block 4 loop3: unable to read partition table UDF-fs: error (device loop2): udf_process_sequence: Block 2016 of volume descriptor sequence is corrupted or we could not read it loop3: partition table beyond EOD, truncated netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. audit: type=1804 audit(1665686586.262:10): pid=10622 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir3264162930/syzkaller.MzajmS/50/bus" dev="sda1" ino=13980 res=1 loop_reread_partitions: partition scan of loop3 () failed (rc=-5) UDF-fs: error (device loop2): udf_read_tagged: read failed, block=512, location=512 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'. UDF-fs: error (device loop1): udf_process_sequence: Block 100 of volume descriptor sequence is corrupted or we could not read it SQUASHFS error: Unable to read inode 0x140 Dev loop3: unable to read RDB block 4 loop3: unable to read partition table UDF-fs: error (device loop1): udf_process_sequence: Block 2016 of volume descriptor sequence is corrupted or we could not read it loop3: partition table beyond EOD, truncated UDF-fs: error (device loop1): udf_read_tagged: read failed, block=512, location=512 loop_reread_partitions: partition scan of loop3 () failed (rc=-5) audit: type=1804 audit(1665686586.522:11): pid=10678 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir2705244310/syzkaller.3bo3hz/58/bus" dev="sda1" ino=13932 res=1 audit: type=1804 audit(1665686586.612:12): pid=10678 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.1" name="/root/syzkaller-testdir2705244310/syzkaller.3bo3hz/58/bus" dev="sda1" ino=13932 res=1 SQUASHFS error: Unable to read inode 0x140 Dev loop3: unable to read RDB block 4 loop3: unable to read partition table loop3: partition table beyond EOD, truncated SQUASHFS error: Unable to read inode 0x140 loop_reread_partitions: partition scan of loop3 () failed (rc=-5) SQUASHFS error: Unable to read inode 0x140 Dev loop3: unable to read RDB block 4 loop3: unable to read partition table loop3: partition table beyond EOD, truncated loop_reread_partitions: partition scan of loop3 () failed (rc=-5) netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs warning (device sda1): verify_group_input:146: Cannot add at group 1 (only 16 groups) unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 vhci_hcd vhci_hcd.0: pdev(4) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd vhci_hcd.0: Device attached vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd: release socket vhci_hcd: disconnect device