======================================================
WARNING: possible circular locking dependency detected
4.14.197-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.5/21408 is trying to acquire lock:
(&event->child_mutex){+.+.}, at: [<ffffffff816a9e92>] perf_read_group kernel/events/core.c:4541 [inline]
(&event->child_mutex){+.+.}, at: [<ffffffff816a9e92>] __perf_read kernel/events/core.c:4623 [inline]
(&event->child_mutex){+.+.}, at: [<ffffffff816a9e92>] perf_read+0x2a2/0x7c0 kernel/events/core.c:4638
but task is already holding lock:
(&cpuctx_mutex){+.+.}, at: [<ffffffff8169c9fd>] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1240
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:11249
perf_event_init+0x2cc/0x308 kernel/events/core.c:11296
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:11243
cpuhp_invoke_callback+0x1e6/0x1a80 kernel/cpu.c:184
cpuhp_up_callbacks kernel/cpu.c:572 [inline]
_cpu_up+0x219/0x500 kernel/cpu.c:1140
do_cpu_up+0x9a/0x160 kernel/cpu.c:1175
smp_init+0x197/0x1ac kernel/smp.c:578
kernel_init_freeable+0x3f4/0x619 init/main.c:1068
kernel_init+0xd/0x15b 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+0x517/0x750 kernel/tracepoint.c:223
tracepoint_probe_register_prio kernel/tracepoint.c:283 [inline]
tracepoint_probe_register+0x8c/0xc0 kernel/tracepoint.c:304
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:8132
perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9368
perf_init_event kernel/events/core.c:9406 [inline]
perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9666
perf_event_alloc kernel/events/core.c:10019 [inline]
SYSC_perf_event_open kernel/events/core.c:10123 [inline]
SyS_perf_event_open+0x67f/0x24b0 kernel/events/core.c:10009
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:279 [inline]
tracepoint_probe_register+0x68/0xc0 kernel/tracepoint.c:304
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:8132
perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9368
perf_init_event kernel/events/core.c:9406 [inline]
perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9666
perf_event_alloc kernel/events/core.c:10019 [inline]
SYSC_perf_event_open kernel/events/core.c:10123 [inline]
SyS_perf_event_open+0x67f/0x24b0 kernel/events/core.c:10009
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:4243
free_event+0x32/0x40 kernel/events/core.c:4270
perf_event_release_kernel+0x368/0x8a0 kernel/events/core.c:4414
perf_release+0x33/0x40 kernel/events/core.c:4440
__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:4541 [inline]
__perf_read kernel/events/core.c:4623 [inline]
perf_read+0x2a2/0x7c0 kernel/events/core.c:4638
__vfs_read+0xe4/0x620 fs/read_write.c:411
vfs_read+0x139/0x340 fs/read_write.c:447
SYSC_read fs/read_write.c:574 [inline]
SyS_read+0xf2/0x210 fs/read_write.c:567
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.5/21408:
#0: (&cpuctx_mutex){+.+.}, at: [<ffffffff8169c9fd>] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1240
stack backtrace:
CPU: 0 PID: 21408 Comm: syz-executor.5 Not tainted 4.14.197-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+0x1b2/0x283 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:4541 [inline]
__perf_read kernel/events/core.c:4623 [inline]
perf_read+0x2a2/0x7c0 kernel/events/core.c:4638
__vfs_read+0xe4/0x620 fs/read_write.c:411
vfs_read+0x139/0x340 fs/read_write.c:447
SYSC_read fs/read_write.c:574 [inline]
SyS_read+0xf2/0x210 fs/read_write.c:567
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45d5b9
RSP: 002b:00007f4aca323c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000025fc0 RCX: 000000000045d5b9
RDX: 0000000000002020 RSI: 0000000020002e00 RDI: 0000000000000003
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007fff7496587f R14: 00007f4aca3249c0 R15: 000000000118cf4c
cannot load conntrack support for proto=2
divide error: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 21531 Comm: syz-executor.5 Not tainted 4.14.197-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88809f40c400 task.stack: ffff888082f58000
RIP: 0010:fbcon_init+0xccc/0x1dd0 drivers/video/fbdev/core/fbcon.c:1116
RSP: 0018:ffff888082f5f7d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8880a5b94cc0 RCX: ffffc9000630e000
RDX: 0000000000000000 RSI: ffff8880902d6f74 RDI: ffff8880a5b94e78
RBP: ffff8880902d6bc0 R08: ffff8880a5b94cc0 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88809f40c400 R12: ffff88821928f600
R13: ffff8880902d6ef4 R14: 0000000000000600 R15: 000000000000001d
FS: 00007f4aca324700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4aca302db8 CR3: 00000000a100a000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
visual_init+0x332/0x5e0 drivers/tty/vt/vt.c:746
vc_allocate+0x2c5/0x640 drivers/tty/vt/vt.c:802
con_install+0x4d/0x450 drivers/tty/vt/vt.c:2899
tty_driver_install_tty drivers/tty/tty_io.c:1225 [inline]
tty_init_dev.part.0+0x99/0x400 drivers/tty/tty_io.c:1338
tty_init_dev drivers/tty/tty_io.c:1328 [inline]
tty_open_by_driver drivers/tty/tty_io.c:1973 [inline]
tty_open+0x669/0x8b0 drivers/tty/tty_io.c:2021
chrdev_open+0x23c/0x6d0 fs/char_dev.c:423
do_dentry_open+0x44b/0xec0 fs/open.c:777
vfs_open+0x105/0x220 fs/open.c:888
do_last fs/namei.c:3428 [inline]
path_openat+0x628/0x2970 fs/namei.c:3569
do_filp_open+0x179/0x3c0 fs/namei.c:3603
do_sys_open+0x296/0x410 fs/open.c:1081
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x417101
RSP: 002b:00007f4aca323820 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000118cf40 RCX: 0000000000417101
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007f4aca323850
RBP: 000000000118cf80 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000064 R11: 0000000000000293 R12: 000000000118cf4c
R13: 00007fff7496587f R14: 00007f4aca3249c0 R15: 000000000118cf4c
Code: 24 38 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e ad 0d 00 00 8b 44 24 20 31 d2 48 8b 74 24 40 <f7> b5 b0 03 00 00 48 89 f2 48 c1 ea 03 89 44 24 20 48 b8 00 00
RIP: fbcon_init+0xccc/0x1dd0 drivers/video/fbdev/core/fbcon.c:1116 RSP: ffff888082f5f7d8
---[ end trace 752cf0c150675b94 ]---