Scheduler tracepoints stat_sleep, stat_iowait, stat_blocked and stat_runtime require the kernel parameter schedstats=enable or kernel.sched_schedstats=1
======================================================
WARNING: possible circular locking dependency detected
4.14.224-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.1/16075 is trying to acquire lock:
(&event->child_mutex){+.+.}, at: [<ffffffff8163f888>] perf_event_read_value+0x78/0x410 kernel/events/core.c:4453
but task is already holding lock:
(&cpuctx_mutex){+.+.}, at: [<ffffffff8163301d>] 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/0x160 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_event_read_value+0x78/0x410 kernel/events/core.c:4453
perf_read_one kernel/events/core.c:4575 [inline]
__perf_read kernel/events/core.c:4626 [inline]
perf_read+0x3e2/0x7c0 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.1/16075:
#0: (&cpuctx_mutex){+.+.}, at: [<ffffffff8163301d>] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1241
stack backtrace:
CPU: 0 PID: 16075 Comm: syz-executor.1 Not tainted 4.14.224-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_event_read_value+0x78/0x410 kernel/events/core.c:4453
perf_read_one kernel/events/core.c:4575 [inline]
__perf_read kernel/events/core.c:4626 [inline]
perf_read+0x3e2/0x7c0 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: 0033:0x465f69
RSP: 002b:00007fb29c4e9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69
RDX: 0000000000000001 RSI: 00000000200002c0 RDI: 0000000000000005
RBP: 00000000004bfa3f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffd05e6db0f R14: 00007fb29c4e9300 R15: 0000000000022000
Bluetooth: hci4 command 0x0405 tx timeout
bridge0: port 3(veth3) entered blocking state
bridge0: port 3(veth3) entered disabled state
device veth3 entered promiscuous mode
bridge0: port 4(veth5) entered blocking state
bridge0: port 4(veth5) entered disabled state
device veth5 entered promiscuous mode
bridge0: port 5(veth7) entered blocking state
bridge0: port 5(veth7) entered disabled state
device veth7 entered promiscuous mode