WARNING: CPU: 0 PID: 30747 at kernel/events/core.c:331 event_function_local.constprop.113+0x520/0x5c0 kernel/events/core.c:331
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 30747 Comm: syz-executor1 Not tainted 4.17.0-rc3+ #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1b9/0x294 lib/dump_stack.c:113
panic+0x22f/0x4de kernel/panic.c:184
__warn.cold.8+0x163/0x1b3 kernel/panic.c:536
report_bug+0x252/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:event_function_local.constprop.113+0x520/0x5c0 kernel/events/core.c:331
RSP: 0018:ffff8801dae07cf8 EFLAGS: 00010006
RAX: ffff88019947e000 RBX: ffff88019bd4a2c0 RCX: ffffffff818fdefa
RDX: 0000000000010000 RSI: ffffffff818fe0f0 RDI: 0000000000000005
RBP: ffff8801dae07d98 R08: ffff88019947e000 R09: ffffed00337a9459
R10: ffffed00337a9459 R11: ffff88019bd4a2cb R12: 1ffff1003b5c0fa2
R13: ffff8801dae31408 R14: ffff8801b1c0a180 R15: ffff8801c47a9180
perf_event_disable_local kernel/events/core.c:2180 [inline]
perf_pending_event+0x242/0x2a0 kernel/events/core.c:5809
irq_work_run_list+0x1b4/0x270 kernel/irq_work.c:155
irq_work_run+0x1d/0x50 kernel/irq_work.c:170
smp_irq_work_interrupt+0x10a/0x650 arch/x86/kernel/irq_work.c:21
irq_work_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa1/0xc0 kernel/locking/spinlock.c:184
RSP: 0018:ffff8801d06574f8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff09
RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 0000000000000000
RDX: 1ffffffff11a316d RSI: 0000000000000001 RDI: 0000000000000286
RBP: ffff8801d0657508 R08: ffffed0036381520 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801b1c0a8f8
R13: ffff8801b1c0a180 R14: 0000000000000001 R15: 1ffff1003a0caed3
try_to_wake_up+0x102/0x1190 kernel/sched/core.c:2057
wake_up_process kernel/sched/core.c:2126 [inline]
wake_up_q+0xa4/0x100 kernel/sched/core.c:443
futex_wake+0x607/0x750 kernel/futex.c:1556
do_futex+0x300/0x27d0 kernel/futex.c:3531
__do_sys_futex kernel/futex.c:3587 [inline]
__se_sys_futex kernel/futex.c:3555 [inline]
__x64_sys_futex+0x46a/0x680 kernel/futex.c:3555
do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455979
RSP: 002b:00007ffd16cb3458 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 000000000072bea0 RCX: 0000000000455979
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000072bec8
RBP: 00000000000002bc R08: 00007ffd16cb3590 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000007
R13: 00007ffd16cb3590 R14: 000000000072becc R15: 0000000000000000
======================================================
WARNING: possible circular locking dependency detected
4.17.0-rc3+ #5 Not tainted
------------------------------------------------------
syz-executor1/30747 is trying to acquire lock:
00000000a7722cb7 ((console_sem).lock){-...}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
but task is already holding lock:
000000003556c998 (&ctx->lock){-.-.}, at: perf_ctx_lock kernel/events/core.c:157 [inline]
000000003556c998 (&ctx->lock){-.-.}, at: event_function_local.constprop.113+0x2a3/0x5c0 kernel/events/core.c:318
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&ctx->lock){-.-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144
perf_event_context_sched_out kernel/events/core.c:3129 [inline]
__perf_event_task_sched_out+0x12df/0x1a30 kernel/events/core.c:3221
perf_event_task_sched_out include/linux/perf_event.h:1103 [inline]
prepare_task_switch kernel/sched/core.c:2636 [inline]
context_switch kernel/sched/core.c:2813 [inline]
__schedule+0xfed/0x1e30 kernel/sched/core.c:3490
schedule+0xef/0x430 kernel/sched/core.c:3549
exit_to_usermode_loop+0x220/0x310 arch/x86/entry/common.c:152
prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #2 (&rq->lock){-.-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144
rq_lock kernel/sched/sched.h:1799 [inline]
task_fork_fair+0x8a/0x660 kernel/sched/fair.c:9967
sched_fork+0x43e/0xb30 kernel/sched/core.c:2379
copy_process.part.38+0x1c18/0x6e90 kernel/fork.c:1764
copy_process kernel/fork.c:1607 [inline]
_do_fork+0x291/0x12a0 kernel/fork.c:2088
kernel_thread+0x34/0x40 kernel/fork.c:2147
rest_init+0x22/0xe4 init/main.c:407
start_kernel+0x906/0x92d init/main.c:737
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:445
x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:426
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242
-> #1 (&p->pi_lock){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
try_to_wake_up+0xca/0x1190 kernel/sched/core.c:1963
wake_up_process+0x10/0x20 kernel/sched/core.c:2126
__up.isra.1+0x1b8/0x290 kernel/locking/semaphore.c:262
up+0x12f/0x1b0 kernel/locking/semaphore.c:187
__up_console_sem+0xbe/0x1b0 kernel/printk/printk.c:242
console_unlock+0x7d6/0x1100 kernel/printk/printk.c:2417
do_con_write+0x12b2/0x2280 drivers/tty/vt/vt.c:2437
con_write+0x25/0xc0 drivers/tty/vt/vt.c:2786
process_output_block drivers/tty/n_tty.c:579 [inline]
n_tty_write+0x6b9/0x1180 drivers/tty/n_tty.c:2308
do_tty_write drivers/tty/tty_io.c:958 [inline]
tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
__vfs_write+0x10b/0x960 fs/read_write.c:485
vfs_write+0x1f8/0x560 fs/read_write.c:549
ksys_write+0xf9/0x250 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 ((console_sem).lock){-...}:
lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
__down_trylock_console_sem+0xae/0x200 kernel/printk/printk.c:225
console_trylock+0x15/0xa0 kernel/printk/printk.c:2229
console_trylock_spinning kernel/printk/printk.c:1643 [inline]
vprintk_emit+0x694/0xdd0 kernel/printk/printk.c:1906
vprintk_default+0x28/0x30 kernel/printk/printk.c:1947
vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:379
printk+0x9e/0xba kernel/printk/printk.c:1980
__warn.cold.8+0x73/0x1b3 kernel/panic.c:518
report_bug+0x252/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
event_function_local.constprop.113+0x520/0x5c0 kernel/events/core.c:331
perf_event_disable_local kernel/events/core.c:2180 [inline]
perf_pending_event+0x242/0x2a0 kernel/events/core.c:5809
irq_work_run_list+0x1b4/0x270 kernel/irq_work.c:155
irq_work_run+0x1d/0x50 kernel/irq_work.c:170
smp_irq_work_interrupt+0x10a/0x650 arch/x86/kernel/irq_work.c:21
irq_work_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline]
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
_raw_spin_unlock_irqrestore+0xa1/0xc0 kernel/locking/spinlock.c:184
try_to_wake_up+0x102/0x1190 kernel/sched/core.c:2057
wake_up_process kernel/sched/core.c:2126 [inline]
wake_up_q+0xa4/0x100 kernel/sched/core.c:443
futex_wake+0x607/0x750 kernel/futex.c:1556
do_futex+0x300/0x27d0 kernel/futex.c:3531
__do_sys_futex kernel/futex.c:3587 [inline]
__se_sys_futex kernel/futex.c:3555 [inline]
__x64_sys_futex+0x46a/0x680 kernel/futex.c:3555
do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Chain exists of:
(console_sem).lock --> &rq->lock --> &ctx->lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ctx->lock);
lock(&rq->lock);
lock(&ctx->lock);
lock((console_sem).lock);
*** DEADLOCK ***
2 locks held by syz-executor1/30747:
#0: 00000000dcc6c596 (&cpuctx_lock){-.-.}, at: perf_ctx_lock kernel/events/core.c:155 [inline]
#0: 00000000dcc6c596 (&cpuctx_lock){-.-.}, at: event_function_local.constprop.113+0x282/0x5c0 kernel/events/core.c:318
#1: 000000003556c998 (&ctx->lock){-.-.}, at: perf_ctx_lock kernel/events/core.c:157 [inline]
#1: 000000003556c998 (&ctx->lock){-.-.}, at: event_function_local.constprop.113+0x2a3/0x5c0 kernel/events/core.c:318
stack backtrace:
CPU: 0 PID: 30747 Comm: syz-executor1 Not tainted 4.17.0-rc3+ #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1b9/0x294 lib/dump_stack.c:113
print_circular_bug.isra.36.cold.54+0x1bd/0x27d kernel/locking/lockdep.c:1223
check_prev_add kernel/locking/lockdep.c:1863 [inline]
check_prevs_add kernel/locking/lockdep.c:1976 [inline]
validate_chain kernel/locking/lockdep.c:2417 [inline]
__lock_acquire+0x343e/0x5140 kernel/locking/lockdep.c:3431
lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
__down_trylock_console_sem+0xae/0x200 kernel/printk/printk.c:225
console_trylock+0x15/0xa0 kernel/printk/printk.c:2229
console_trylock_spinning kernel/printk/printk.c:1643 [inline]
vprintk_emit+0x694/0xdd0 kernel/printk/printk.c:1906
vprintk_default+0x28/0x30 kernel/printk/printk.c:1947
vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:379
printk+0x9e/0xba kernel/printk/printk.c:1980
__warn.cold.8+0x73/0x1b3 kernel/panic.c:518
report_bug+0x252/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:event_function_local.constprop.113+0x520/0x5c0 kernel/events/core.c:331
RSP: 0018:ffff8801dae07cf8 EFLAGS: 00010006
RAX: ffff88019947e000 RBX: ffff88019bd4a2c0 RCX: ffffffff818fdefa
RDX: 0000000000010000 RSI: ffffffff818fe0f0 RDI: 0000000000000005
RBP: ffff8801dae07d98 R08: ffff88019947e000 R09: ffffed00337a9459
R10: ffffed00337a9459 R11: ffff88019bd4a2cb R12: 1ffff1003b5c0fa2
R13: ffff8801dae31408 R14: ffff8801b1c0a180 R15: ffff8801c47a9180
perf_event_disable_local kernel/events/core.c:2180 [inline]
perf_pending_event+0x242/0x2a0 kernel/events/core.c:5809
irq_work_run_list+0x1b4/0x270 kernel/irq_work.c:155
irq_work_run+0x1d/0x50 kernel/irq_work.c:170
smp_irq_work_interrupt+0x10a/0x650 arch/x86/kernel/irq_work.c:21
irq_work_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa1/0xc0 kernel/locking/spinlock.c:184
RSP: 0018:ffff8801d06574f8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff09
RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 0000000000000000
RDX: 1ffffffff11a316d RSI: 0000000000000001 RDI: 0000000000000286
RBP: ffff8801d0657508 R08: ffffed0036381520 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801b1c0a8f8
R13: ffff8801b1c0a180 R14: 0000000000000001 R15: 1ffff1003a0caed3
try_to_wake_up+0x102/0x1190 kernel/sched/core.c:2057
wake_up_process kernel/sched/core.c:2126 [inline]
wake_up_q+0xa4/0x100 kernel/sched/core.c:443
futex_wake+0x607/0x750 kernel/futex.c:1556
do_futex+0x300/0x27d0 kernel/futex.c:3531
Lost 39 message(s)!
Shutting down cpus with NMI
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..