device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state ====================================================== WARNING: possible circular locking dependency detected 4.14.302-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/10204 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+0x5e/0xd3 -> #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:11291 perf_event_init+0x2cc/0x308 kernel/events/core.c:11338 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:11285 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/0x15d init/main.c:1006 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 -> #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:8145 perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9379 perf_init_event kernel/events/core.c:9417 [inline] perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9677 perf_event_alloc kernel/events/core.c:10047 [inline] SYSC_perf_event_open kernel/events/core.c:10151 [inline] SyS_perf_event_open+0x683/0x2530 kernel/events/core.c:10037 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 -> #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:8145 perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9379 perf_init_event kernel/events/core.c:9417 [inline] perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9677 perf_event_alloc kernel/events/core.c:10047 [inline] SYSC_perf_event_open kernel/events/core.c:10151 [inline] SyS_perf_event_open+0x683/0x2530 kernel/events/core.c:10037 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 -> #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+0x5e/0xd3 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.2/10204: #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: 0 PID: 10204 Comm: syz-executor.2 Not tainted 4.14.302-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 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+0x5e/0xd3 RIP: 0033:0x7f0c6c8d60c9 RSP: 002b:00007f0c6ae48118 EFLAGS: 00000246 ORIG_RAX: 000000000000003c RAX: ffffffffffffffda RBX: 00007f0c6c9f5f80 RCX: 00007f0c6c8d60c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f0c6c931ae9 R08: ffffffffffffffff R09: ffffffffffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd2807294f R14: 00007f0c6ae48300 R15: 0000000000022000 audit: type=1804 audit(1673483581.515:2): pid=10272 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir3464942588/syzkaller.Jfuym7/45/file0" dev="sda1" ino=13995 res=1 audit: type=1804 audit(1673483581.515:3): pid=10278 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir414754805/syzkaller.ZCUNKC/44/file0" dev="sda1" ino=14000 res=1 audit: type=1804 audit(1673483581.535:4): pid=10272 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.2" name="/root/syzkaller-testdir3464942588/syzkaller.Jfuym7/45/file0" dev="sda1" ino=13995 res=1 audit: type=1804 audit(1673483581.575:5): pid=10290 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir3464942588/syzkaller.Jfuym7/46/file0" dev="sda1" ino=13960 res=1 audit: type=1804 audit(1673483581.575:6): pid=10290 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.2" name="/root/syzkaller-testdir3464942588/syzkaller.Jfuym7/46/file0" dev="sda1" ino=13960 res=1 audit: type=1804 audit(1673483582.435:7): pid=10315 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir3464942588/syzkaller.Jfuym7/47/file0" dev="sda1" ino=14019 res=1 SQUASHFS error: squashfs_read_data failed to read block 0x247 SQUASHFS error: Unable to read metadata cache entry [247] audit: type=1804 audit(1673483582.465:8): pid=10315 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.2" name="/root/syzkaller-testdir3464942588/syzkaller.Jfuym7/47/file0" dev="sda1" ino=14019 res=1 SQUASHFS error: Unable to read inode 0x11f audit: type=1804 audit(1673483582.555:9): pid=10336 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir3464942588/syzkaller.Jfuym7/48/file0" dev="sda1" ino=14010 res=1 audit: type=1804 audit(1673483582.555:10): pid=10336 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.2" name="/root/syzkaller-testdir3464942588/syzkaller.Jfuym7/48/file0" dev="sda1" ino=14010 res=1 QAT: Invalid ioctl SQUASHFS error: squashfs_read_data failed to read block 0x247 SQUASHFS error: Unable to read metadata cache entry [247] SQUASHFS error: Unable to read inode 0x11f TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. SQUASHFS error: squashfs_read_data failed to read block 0x247 SQUASHFS error: Unable to read metadata cache entry [247] SQUASHFS error: Unable to read inode 0x11f kernel profiling enabled (shift: 0) audit: type=1804 audit(1673483584.915:11): pid=10488 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir3040931617/syzkaller.zmzzWu/50/cgroup.controllers" dev="sda1" ino=14067 res=1 unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 kauditd_printk_skb: 4 callbacks suppressed audit: type=1804 audit(1673483586.825:16): pid=10607 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir4073669705/syzkaller.Vu3BHD/52/cgroup.controllers" dev="sda1" ino=14094 res=1 audit: type=1804 audit(1673483586.865:17): pid=10615 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir3040931617/syzkaller.zmzzWu/52/cgroup.controllers" dev="sda1" ino=14095 res=1 audit: type=1804 audit(1673483587.426:18): pid=10652 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir1535156043/syzkaller.VnCklR/65/cgroup.controllers" dev="sda1" ino=14098 res=1 audit: type=1804 audit(1673483587.726:19): pid=10667 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir3040931617/syzkaller.zmzzWu/53/cgroup.controllers" dev="sda1" ino=14107 res=1 audit: type=1804 audit(1673483587.756:20): pid=10665 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir4073669705/syzkaller.Vu3BHD/53/cgroup.controllers" dev="sda1" ino=14102 res=1 PF_BRIDGE: br_mdb_parse() with invalid entry Zero length message leads to an empty skb netlink: 44 bytes leftover after parsing attributes in process `syz-executor.4'. syz-executor.0 uses obsolete (PF_INET,SOCK_PACKET)