====================================================== WARNING: possible circular locking dependency detected 4.14.228-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/31411 is trying to acquire lock: (&event->child_mutex){+.+.}, at: [] perf_read_group kernel/events/core.c:4542 [inline] (&event->child_mutex){+.+.}, at: [] __perf_read kernel/events/core.c:4624 [inline] (&event->child_mutex){+.+.}, at: [] perf_read+0x2a2/0x7c0 kernel/events/core.c:4639 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:11250 perf_event_init+0x2cc/0x308 kernel/events/core.c:11297 start_kernel+0x46a/0x770 init/main.c:620 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:11244 cpuhp_invoke_callback+0x1e6/0x1a80 kernel/cpu.c:184 cpuhp_up_callbacks kernel/cpu.c:572 [inline] _cpu_up+0x219/0x500 kernel/cpu.c:1144 do_cpu_up+0x9a/0x160 kernel/cpu.c:1179 smp_init+0x197/0x1ac kernel/smp.c:578 kernel_init_freeable+0x3f4/0x614 init/main.c:1068 kernel_init+0xd/0x15e init/main.c:1000 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:295 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:8138 perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9369 perf_init_event kernel/events/core.c:9407 [inline] perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9667 perf_event_alloc kernel/events/core.c:10020 [inline] SYSC_perf_event_open kernel/events/core.c:10124 [inline] SyS_perf_event_open+0x67f/0x24b0 kernel/events/core.c:10010 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:8138 perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9369 perf_init_event kernel/events/core.c:9407 [inline] perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9667 perf_event_alloc kernel/events/core.c:10020 [inline] SYSC_perf_event_open kernel/events/core.c:10124 [inline] SyS_perf_event_open+0x67f/0x24b0 kernel/events/core.c:10010 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:4244 free_event+0x32/0x40 kernel/events/core.c:4271 perf_event_release_kernel+0x368/0x8a0 kernel/events/core.c:4415 perf_release+0x33/0x40 kernel/events/core.c:4441 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 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_read_group kernel/events/core.c:4542 [inline] __perf_read kernel/events/core.c:4624 [inline] perf_read+0x2a2/0x7c0 kernel/events/core.c:4639 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 do_readv+0xfc/0x2c0 fs/read_write.c:1014 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.4/31411: #0: (&cpuctx_mutex){+.+.}, at: [] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1241 stack backtrace: CPU: 0 PID: 31411 Comm: syz-executor.4 Not tainted 4.14.228-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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_read_group kernel/events/core.c:4542 [inline] __perf_read kernel/events/core.c:4624 [inline] perf_read+0x2a2/0x7c0 kernel/events/core.c:4639 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 do_readv+0xfc/0x2c0 fs/read_write.c:1014 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x466459 RSP: 002b:00007f1a1e480188 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000001 RSI: 00000000200002c0 RDI: 0000000000000007 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffd2331ce2f R14: 00007f1a1e480300 R15: 0000000000022000 overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: fs on '.' does not support file handles, falling back to index=off. overlayfs: filesystem on './bus' not supported as upperdir overlayfs: 'file0' not a directory PF_BRIDGE: RTM_SETLINK with unknown ifindex bridge0: port 3(veth3) entered blocking state bridge0: port 3(veth3) entered disabled state device veth3 entered promiscuous mode netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. bridge0: port 4(veth5) entered blocking state bridge0: port 4(veth5) entered disabled state device veth5 entered promiscuous mode IPVS: ftp: loaded support on port[0] = 21 audit: type=1800 audit(1617557746.631:12977): pid=31602 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=14258 res=0 audit: type=1800 audit(1617557746.660:12978): pid=31602 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=14258 res=0 audit: type=1800 audit(1617557746.680:12979): pid=31606 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name=10 dev="sda1" ino=14340 res=0 audit: type=1800 audit(1617557746.680:12980): pid=31606 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=14258 res=0 ieee80211 phy15: Selected rate control algorithm 'minstrel_ht' ieee80211 phy15: hwaddr 02:00:00:00:0f:00 registered team0: Device macsec0 is up. Set it down before adding it as a team port team0: Device macsec0 is up. Set it down before adding it as a team port Process accounting resumed EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue Process accounting resumed Process accounting resumed audit: type=1804 audit(1617557749.374:12981): pid=31797 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir315780131/syzkaller.ASa806/82/bus" dev="sda1" ino=14578 res=1 Process accounting resumed batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 Process accounting resumed EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed xt_cluster: this node mask cannot be higher than the total number of nodes xt_cluster: this node mask cannot be higher than the total number of nodes Process accounting resumed Process accounting resumed bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 1(bridge_slave_0) entered disabled state batman_adv: batadv0: Interface deactivated: batadv_slave_1 device vxlan0 left promiscuous mode audit: type=1800 audit(1617557751.291:12982): pid=31932 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=14435 res=0 Process accounting resumed audit: type=1804 audit(1617557751.321:12983): pid=31932 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.2" name="/root/syzkaller-testdir233484365/syzkaller.EgrlfK/55/file0/bus" dev="sda1" ino=14435 res=1 audit: type=1800 audit(1617557751.669:12984): pid=31949 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=15043 res=0 Process accounting resumed input: syz1 as /devices/virtual/input/input18 audit: type=1804 audit(1617557751.669:12985): pid=31949 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.2" name="/root/syzkaller-testdir233484365/syzkaller.EgrlfK/56/file0/bus" dev="sda1" ino=15043 res=1 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. input: syz1 as /devices/virtual/input/input19 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. Process accounting resumed audit: type=1800 audit(1617557751.818:12986): pid=31967 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=15059 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. audit: type=1804 audit(1617557751.838:12987): pid=31967 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.2" name="/root/syzkaller-testdir233484365/syzkaller.EgrlfK/57/file0/bus" dev="sda1" ino=15059 res=1 Process accounting resumed pit: kvm: requested 108952 ns i8254 timer period limited to 500000 ns audit: type=1800 audit(1617557752.821:12988): pid=32068 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.0" name="bus" dev="sda1" ino=14131 res=0 pit: kvm: requested 39390 ns i8254 timer period limited to 500000 ns pit: kvm: requested 84647 ns i8254 timer period limited to 500000 ns pit: kvm: requested 39390 ns i8254 timer period limited to 500000 ns pit: kvm: requested 96381 ns i8254 timer period limited to 500000 ns pit: kvm: requested 82971 ns i8254 timer period limited to 500000 ns pit: kvm: requested 838 ns i8254 timer period limited to 500000 ns pit: kvm: requested 3352 ns i8254 timer period limited to 500000 ns pit: kvm: requested 8380 ns i8254 timer period limited to 500000 ns pit: kvm: requested 154209 ns i8254 timer period limited to 500000 ns audit: type=1800 audit(1617557753.337:12989): pid=32085 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=15250 res=0 Process accounting resumed audit: type=1804 audit(1617557753.377:12990): pid=32085 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.2" name="/root/syzkaller-testdir233484365/syzkaller.EgrlfK/65/file0/bus" dev="sda1" ino=15250 res=1 Process accounting resumed Process accounting resumed