======================================================
WARNING: possible circular locking dependency detected
4.14.294-syzkaller #0 Not tainted
bridge0: port 3(team0) entered disabled state
------------------------------------------------------
syz-executor.3/9897 is trying to acquire lock:
 (&event->child_mutex){+.+.}, at: [<ffffffff81630f02>] perf_event_for_each_child+0x82/0x140 kernel/events/core.c:4690

but task is already holding lock:
 (&cpuctx_mutex){+.+.}, at: [<ffffffff8163596d>] 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: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

-> #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: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/0x16a init/main.c:1006
       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: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

-> #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: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

-> #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: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

-> #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_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

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.3/9897:
 #0:  (&cpuctx_mutex){+.+.}, at: [<ffffffff8163596d>] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1241

stack backtrace:
CPU: 1 PID: 9897 Comm: syz-executor.3 Not tainted 4.14.294-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2022
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_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
RIP: 0033:0x7f9e442cc649
RSP: 002b:00007f9e42c40168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9e443ddf80 RCX: 00007f9e442cc649
RDX: 0000000000000005 RSI: 0000000000002403 RDI: 0000000000000007
RBP: 00007f9e44327560 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd084cc9bf R14: 00007f9e42c40300 R15: 0000000000022000
batman_adv: batadv0: Adding interface: team0
batman_adv: batadv0: The MTU of interface team0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem.
batman_adv: batadv0: Interface activated: team0
batman_adv: batadv0: Interface deactivated: team0
batman_adv: batadv0: Removing interface: team0
bridge0: port 3(team0) entered blocking state
bridge0: port 3(team0) entered disabled state
bridge0: port 3(team0) entered blocking state
bridge0: port 3(team0) entered forwarding state
bridge0: port 3(team0) entered disabled state
batman_adv: batadv0: Adding interface: team0
print_req_error: I/O error, dev loop4, sector 0
Unknown ioctl -1072131212
batman_adv: batadv0: The MTU of interface team0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem.
batman_adv: batadv0: Interface activated: team0
batman_adv: batadv0: Interface deactivated: team0
batman_adv: batadv0: Removing interface: team0
bridge0: port 3(team0) entered blocking state
bridge0: port 3(team0) entered disabled state
bridge0: port 3(team0) entered blocking state
bridge0: port 3(team0) entered forwarding state
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'.
print_req_error: I/O error, dev loop4, sector 0
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'.
bond2 (uninitialized): Released all slaves
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'.
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
capability: warning: `syz-executor.4' uses deprecated v2 capabilities in a way that may be insecure
bond2 (uninitialized): Released all slaves
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'.
Unknown ioctl -1072131212
Unknown ioctl -1072131212
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
bond2 (uninitialized): Released all slaves
FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
Unknown ioctl -1072131212
FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
Unknown ioctl -1072131212
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
Unknown ioctl -1072131212
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
Unknown ioctl -1072131212
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
BFS-fs: bfs_fill_super(): loop2 is unclean, continuing
BFS-fs: bfs_fill_super(): Inode 0x0000001b corrupted
audit: type=1800 audit(1663814020.178:3): pid=10289 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="file0" dev="loop5" ino=20 res=0
atomic_op ffff8880a03f6a80 conn xmit_atomic           (null)
atomic_op ffff88809f97b380 conn xmit_atomic           (null)
atomic_op ffff88809d85c1c0 conn xmit_atomic           (null)
audit: type=1800 audit(1663814020.388:4): pid=10338 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="file0" dev="loop5" ino=21 res=0
atomic_op ffff8880a4dc13c0 conn xmit_atomic           (null)
audit: type=1800 audit(1663814020.478:5): pid=10339 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file0" dev="loop4" ino=22 res=0
audit: type=1800 audit(1663814021.058:6): pid=10374 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="file0" dev="loop5" ino=23 res=0
audit: type=1800 audit(1663814021.098:7): pid=10390 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="file0" dev="loop1" ino=24 res=0
audit: type=1800 audit(1663814021.138:8): pid=10380 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file0" dev="loop4" ino=25 res=0
audit: type=1800 audit(1663814021.268:9): pid=10400 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.0" name="file0" dev="loop0" ino=26 res=0
audit: type=1800 audit(1663814021.308:10): pid=10404 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="loop3" ino=27 res=0
audit: type=1800 audit(1663814021.318:11): pid=10403 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="file0" dev="loop2" ino=28 res=0
audit: type=1800 audit(1663814021.498:12): pid=10426 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file0" dev="loop4" ino=29 res=0
serio: Serial port pts0
IPVS: ftp: loaded support on port[0] = 21