======================================================
WARNING: possible circular locking dependency detected
4.14.167-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.2/14070 is trying to acquire lock:
(event_mutex){+.+.}, at: [<ffffffff816307d8>] perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234
but task is already holding lock:
(&event->child_mutex){+.+.}, at: [<ffffffff816d8a77>] perf_event_release_kernel+0x207/0x880 kernel/events/core.c:4397
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #5 (&event->child_mutex){+.+.}:
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
perf_event_for_each_child+0x8a/0x150 kernel/events/core.c:4682
perf_event_task_disable+0x97/0x120 kernel/events/core.c:4928
SYSC_prctl kernel/sys.c:2288 [inline]
SyS_prctl+0x4c7/0xc50 kernel/sys.c:2197
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
-> #4 (&cpuctx_mutex){+.+.}:
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
perf_event_init_cpu+0xc2/0x170 kernel/events/core.c:11223
perf_event_init+0x2d8/0x31a kernel/events/core.c:11270
start_kernel+0x3b6/0x6fd init/main.c:620
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:399
x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:380
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
-> #3 (pmus_lock){+.+.}:
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
perf_event_init_cpu+0x2f/0x170 kernel/events/core.c:11217
cpuhp_invoke_callback+0x1ea/0x1ab0 kernel/cpu.c:184
cpuhp_up_callbacks kernel/cpu.c:573 [inline]
_cpu_up+0x228/0x530 kernel/cpu.c:1135
do_cpu_up kernel/cpu.c:1170 [inline]
do_cpu_up+0xa6/0x160 kernel/cpu.c:1142
cpu_up+0x1b/0x20 kernel/cpu.c:1178
smp_init+0x157/0x170 kernel/smp.c:578
kernel_init_freeable+0x30b/0x532 init/main.c:1066
kernel_init+0x12/0x162 init/main.c:998
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
-> #2 (cpu_hotplug_lock.rw_sem){++++}:
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
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+0x3d/0xc0 kernel/cpu.c:295
static_key_slow_inc+0x13/0x30 kernel/jump_label.c:123
tracepoint_add_func kernel/tracepoint.c:223 [inline]
tracepoint_probe_register_prio+0x4d6/0x6d0 kernel/tracepoint.c:283
tracepoint_probe_register+0x2b/0x40 kernel/tracepoint.c:304
trace_event_reg+0x277/0x330 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+0x449/0xaa0 kernel/trace/trace_event_perf.c:221
perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:8106
perf_try_init_event+0x164/0x200 kernel/events/core.c:9342
perf_init_event kernel/events/core.c:9380 [inline]
perf_event_alloc.part.0+0xd92/0x25c0 kernel/events/core.c:9640
perf_event_alloc kernel/events/core.c:9993 [inline]
SYSC_perf_event_open+0xad1/0x2690 kernel/events/core.c:10097
SyS_perf_event_open+0x34/0x40 kernel/events/core.c:9983
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
-> #1 (tracepoints_mutex){+.+.}:
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
tracepoint_probe_register_prio+0x36/0x6d0 kernel/tracepoint.c:279
tracepoint_probe_register+0x2b/0x40 kernel/tracepoint.c:304
trace_event_reg+0x277/0x330 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+0x449/0xaa0 kernel/trace/trace_event_perf.c:221
perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:8106
perf_try_init_event+0x164/0x200 kernel/events/core.c:9342
perf_init_event kernel/events/core.c:9380 [inline]
perf_event_alloc.part.0+0xd92/0x25c0 kernel/events/core.c:9640
kauditd_printk_skb: 184 callbacks suppressed
audit: type=1400 audit(1579956734.480:24789): avc: denied { map } for pid=14073 comm="blkid" path="/lib/x86_64-linux-gnu/libuuid.so.1.3.0" dev="sda1" ino=2819 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
perf_event_alloc kernel/events/core.c:9993 [inline]
SYSC_perf_event_open+0xad1/0x2690 kernel/events/core.c:10097
SyS_perf_event_open+0x34/0x40 kernel/events/core.c:9983
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
-> #0 (event_mutex){+.+.}:
check_prev_add kernel/locking/lockdep.c:1901 [inline]
check_prevs_add kernel/locking/lockdep.c:2018 [inline]
validate_chain kernel/locking/lockdep.c:2460 [inline]
__lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
audit: type=1400 audit(1579956734.500:24790): avc: denied { map } for pid=14073 comm="blkid" path="/lib/x86_64-linux-gnu/libuuid.so.1.3.0" dev="sda1" ino=2819 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234
tp_perf_event_destroy+0x16/0x20 kernel/events/core.c:8090
_free_event+0x330/0xe70 kernel/events/core.c:4238
free_event+0x38/0x50 kernel/events/core.c:4265
perf_event_release_kernel+0x364/0x880 kernel/events/core.c:4409
perf_release+0x37/0x50 kernel/events/core.c:4435
__fput+0x275/0x7a0 fs/file_table.c:210
____fput+0x16/0x20 fs/file_table.c:244
task_work_run+0x114/0x190 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x1da/0x220 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+0x4bc/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
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
9pnet: Insufficient options for proto=fd
);
lock(&event->child_mutex);
lock(event_mutex);
*** DEADLOCK ***
2 locks held by syz-executor.2/14070:
#0: (&ctx->mutex){+.+.}, at: [<ffffffff816d8a6d>] perf_event_release_kernel+0x1fd/0x880 kernel/events/core.c:4396
#1: (&event->child_mutex){+.+.}, at: [<ffffffff816d8a77>] perf_event_release_kernel+0x207/0x880 kernel/events/core.c:4397
stack backtrace:
CPU: 1 PID: 14070 Comm: syz-executor.2 Not tainted 4.14.167-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+0x142/0x197 lib/dump_stack.c:58
print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1901 [inline]
check_prevs_add kernel/locking/lockdep.c:2018 [inline]
validate_chain kernel/locking/lockdep.c:2460 [inline]
__lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
9pnet: Insufficient options for proto=fd
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
audit: type=1400 audit(1579956734.820:24791): avc: denied { create } for pid=14071 comm="syz-executor.4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234
tp_perf_event_destroy+0x16/0x20 kernel/events/core.c:8090
_free_event+0x330/0xe70 kernel/events/core.c:4238
free_event+0x38/0x50 kernel/events/core.c:4265
perf_event_release_kernel+0x364/0x880 kernel/events/core.c:4409
perf_release+0x37/0x50 kernel/events/core.c:4435
__fput+0x275/0x7a0 fs/file_table.c:210
____fput+0x16/0x20 fs/file_table.c:244
task_work_run+0x114/0x190 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x1da/0x220 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+0x4bc/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b349
RSP: 002b:00007f8caa4f8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000021
RAX: 0000000000000006 RBX: 00007f8caa4f96d4 RCX: 000000000045b349
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 000000000000000a
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000097 R14: 00000000004c1dc5 R15: 000000000075c07c
vhci_hcd: vhci_device speed not set
audit: type=1400 audit(1579956734.850:24792): avc: denied { write } for pid=14071 comm="syz-executor.4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
audit: type=1400 audit(1579956734.850:24793): avc: denied { read } for pid=14071 comm="syz-executor.4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
vhci_hcd: vhci_device speed not set
netlink: 232 bytes leftover after parsing attributes in process `syz-executor.3'.
vhci_hcd: vhci_device speed not set
audit: type=1400 audit(1579956734.980:24794): avc: denied { map } for pid=14085 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1579956734.990:24795): avc: denied { map } for pid=14085 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
vhci_hcd: vhci_device speed not set
audit: type=1400 audit(1579956735.010:24796): avc: denied { map } for pid=14085 comm="blkid" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
vhci_hcd: vhci_device speed not set
usb usb9-port2: Cannot enable. Maybe the USB cable is bad?
audit: type=1400 audit(1579956735.040:24797): avc: denied { write } for pid=14066 comm="syz-executor.0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
audit: audit_backlog=65 > audit_backlog_limit=64
vhci_hcd: vhci_device speed not set
netlink: 232 bytes leftover after parsing attributes in process `syz-executor.3'.
vhci_hcd: vhci_device speed not set
vhci_hcd: vhci_device speed not set
vhci_hcd: vhci_device speed not set
netlink: 232 bytes leftover after parsing attributes in process `syz-executor.3'.
vhci_hcd: vhci_device speed not set
usb usb9-port2: Cannot enable. Maybe the USB cable is bad?
usb usb9-port2: attempt power cycle
vhci_hcd: vhci_device speed not set
vhci_hcd: vhci_device speed not set
vhci_hcd: vhci_device speed not set
vhci_hcd: vhci_device speed not set
vhci_hcd: vhci_device speed not set
usb usb9-port2: Cannot enable. Maybe the USB cable is bad?
vhci_hcd: vhci_device speed not set
vhci_hcd: vhci_device speed not set
vhci_hcd: vhci_device speed not set
vhci_hcd: vhci_device speed not set
vhci_hcd: vhci_device speed not set
usb usb9-port2: Cannot enable. Maybe the USB cable is bad?
usb usb9-port2: unable to enumerate USB device
vhci_hcd: SetHubDepth req not supported for USB 2.0 roothub
netlink: 232 bytes leftover after parsing attributes in process `syz-executor.3'.
kauditd_printk_skb: 349 callbacks suppressed
audit: type=1400 audit(1579956739.720:25139): avc: denied { create } for pid=14164 comm="syz-executor.4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
netlink: 232 bytes leftover after parsing attributes in process `syz-executor.5'.
audit: type=1400 audit(1579956739.720:25140): avc: denied { write } for pid=14164 comm="syz-executor.4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
audit: type=1400 audit(1579956739.730:25141): avc: denied { read } for pid=14164 comm="syz-executor.4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
audit: type=1400 audit(1579956739.730:25142): avc: denied { create } for pid=14164 comm="syz-executor.4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
audit: type=1400 audit(1579956739.810:25143): avc: denied { write } for pid=14164 comm="syz-executor.4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
audit: type=1400 audit(1579956740.060:25144): avc: denied { map } for pid=14182 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1579956740.060:25145): avc: denied { map } for pid=14182 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1579956740.070:25146): avc: denied { map } for pid=14182 comm="blkid" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: audit_backlog=65 > audit_backlog_limit=64
audit: type=1400 audit(1579956740.070:25147): avc: denied { map } for pid=14182 comm="blkid" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
netlink: 232 bytes leftover after parsing attributes in process `syz-executor.3'.
netlink: 232 bytes leftover after parsing attributes in process `syz-executor.3'.
tmpfs: Bad value 'pre��\��q��&{#���{V��b
�A�l96O��B h�!|8}C� q�wc�'��+#c_�!�O������O�}S��"��< _ ��w������\�' for mount option 'mpol'