====================================================== WARNING: possible circular locking dependency detected 4.14.300-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/10869 is trying to acquire lock: (&event->child_mutex){+.+.}, at: [] perf_event_for_each_child+0x82/0x140 kernel/events/core.c:4690 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: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/0x167 init/main.c:1006 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 -> #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+0x5e/0xd3 -> #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+0x5e/0xd3 -> #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+0x5e/0xd3 -> #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+0x5e/0xd3 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.0/10869: #0: (&cpuctx_mutex){+.+.}, at: [] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1241 stack backtrace: CPU: 1 PID: 10869 Comm: syz-executor.0 Not tainted 4.14.300-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_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 EXT4-fs (loop5): Ignoring removed bh option EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue audit: type=1326 audit(1669843588.341:6): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=10967 comm="syz-executor.2" exe="/root/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fb5ded020d9 code=0x0 EXT4-fs (loop5): Ignoring removed bh option audit: type=1326 audit(1669843588.381:7): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=10967 comm="syz-executor.2" exe="/root/syz-executor.2" sig=31 arch=c000003e syscall=3 compat=0 ip=0x7fb5decb3f8b code=0x0 EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue audit: type=1326 audit(1669843588.501:8): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=10996 comm="syz-executor.4" exe="/root/syz-executor.4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f7a31be80d9 code=0x0 EXT4-fs (loop5): Ignoring removed bh option EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue EXT4-fs (loop5): Ignoring removed bh option EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue audit: type=1326 audit(1669843589.371:9): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=11080 comm="syz-executor.4" exe="/root/syz-executor.4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f7a31be80d9 code=0x0 EXT4-fs (loop5): Ignoring removed bh option netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue device bond1 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): bond1: link is not ready 8021q: adding VLAN 0 to HW filter on device bond1 netlink: 88 bytes leftover after parsing attributes in process `syz-executor.2'. syz-executor.2 (11111) used greatest stack depth: 25056 bytes left audit: type=1326 audit(1669843590.241:10): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=11164 comm="syz-executor.4" exe="/root/syz-executor.4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f7a31be80d9 code=0x0 EXT4-fs (loop5): Ignoring removed bh option EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue EXT4-fs (loop5): Ignoring removed bh option audit: type=1326 audit(1669843591.092:11): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=11213 comm="syz-executor.4" exe="/root/syz-executor.4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f7a31be80d9 code=0x0 EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue EXT4-fs (loop5): Ignoring removed bh option EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue print_req_error: I/O error, dev loop5, sector 0 EXT4-fs (loop5): Ignoring removed bh option EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue EXT4-fs (loop5): Ignoring removed bh option EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue EXT4-fs (loop5): Ignoring removed bh option EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue EXT4-fs (loop5): Ignoring removed bh option EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 EXT4-fs (loop5): Ignoring removed bh option EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue EXT4-fs (loop5): Ignoring removed bh option EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue EXT4-fs (loop5): Ignoring removed bh option EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue EXT4-fs (loop5): Ignoring removed bh option EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue (unnamed net_device) (uninitialized): option resend_igmp: invalid value (18446744073709551615) (unnamed net_device) (uninitialized): option resend_igmp: allowed values 0 - 255 EXT4-fs (loop5): Ignoring removed bh option EXT4-fs (loop5): mounted filesystem without journal. Opts: data_err=abort,jqfmt=vfsold,inode_readahead_blks=0x0000000008000000,quota,grpid,nombcache,nouid32,bh,nouid32,,errors=continue BTRFS: device fsid a6a605fc-d5f1-4e66-8595-3726e2b761d6 devid 1 transid 8 /dev/loop4 BTRFS error (device loop4): unsupported checksum algorithm 3 BTRFS error (device loop4): superblock checksum mismatch BTRFS error (device loop4): open_ctree failed EXT4-fs (loop5): Ignoring removed bh option