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Message-ID: <CACkBjsa74dyF4TiwxH1yKuyaGcPQSEP9mvPedBCaskGU7g5vdw@mail.gmail.com>
Date: Thu, 14 Oct 2021 10:45:24 +0800
From: Hao Sun <sunhao.th@...il.com>
To: Pavel Begunkov <asml.silence@...il.com>,
Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: possible deadlock in io_poll_double_wake
Hello,
When using Healer to fuzz the latest Linux kernel, the following crash
was triggered.
HEAD commit: 64570fbc14f8 Linux 5.15-rc5
git tree: upstream
console output:
https://drive.google.com/file/d/1vA465O1bvHG4dfD07CNI-lcjbFYaD-nK/view?usp=sharing
kernel config: https://drive.google.com/file/d/1em3xgUIMNN_-LUUdySzwN-UDPc3qiiKD/view?usp=sharing
C reproducer: https://drive.google.com/file/d/13EMtDAujxvvBRb3m1gV1zXsp4gkRFJSS/view?usp=sharing
Syzlang reproducer:
https://drive.google.com/file/d/1dFk5ujvk-lnr_KzNGboFm9fvwYdETowv/view?usp=sharing
If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <sunhao.th@...il.com>
============================================
WARNING: possible recursive locking detected
5.15.0-rc5 #3 Not tainted
--------------------------------------------
swapper/0/0 is trying to acquire lock:
ffff88810f5cd130 (&runtime->sleep){..-.}-{2:2}, at:
io_poll_double_wake+0x2be/0x800 fs/io_uring.c:5418
but task is already holding lock:
ffff88810f5cf130 (&runtime->sleep){..-.}-{2:2}, at:
__wake_up_common_lock+0xb4/0x130 kernel/sched/wait.c:137
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&runtime->sleep);
lock(&runtime->sleep);
*** DEADLOCK ***
May be due to missing lock nesting notation
3 locks held by swapper/0/0:
#0: ffffc90000007d68 ((&dpcm->timer)){+.-.}-{0:0}, at:
lockdep_copy_map include/linux/lockdep.h:35 [inline]
#0: ffffc90000007d68 ((&dpcm->timer)){+.-.}-{0:0}, at:
call_timer_fn+0xd5/0x6b0 kernel/time/timer.c:1411
#1: ffff888100fc6108 (&group->lock){..-.}-{2:2}, at:
_snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170
#2: ffff88810f5cf130 (&runtime->sleep){..-.}-{2:2}, at:
__wake_up_common_lock+0xb4/0x130 kernel/sched/wait.c:137
stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.15.0-rc5 #3
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_deadlock_bug kernel/locking/lockdep.c:2944 [inline]
check_deadlock kernel/locking/lockdep.c:2987 [inline]
validate_chain kernel/locking/lockdep.c:3776 [inline]
__lock_acquire.cold+0x168/0x3c3 kernel/locking/lockdep.c:5015
lock_acquire kernel/locking/lockdep.c:5625 [inline]
lock_acquire+0x1ab/0x520 kernel/locking/lockdep.c:5590
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
io_poll_double_wake+0x2be/0x800 fs/io_uring.c:5418
__wake_up_common+0x147/0x650 kernel/sched/wait.c:108
__wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:138
snd_pcm_update_state+0x3d4/0x540 sound/core/pcm_lib.c:203
snd_pcm_update_hw_ptr0+0xe79/0x2090 sound/core/pcm_lib.c:464
snd_pcm_period_elapsed_under_stream_lock+0x15a/0x230 sound/core/pcm_lib.c:1816
snd_pcm_period_elapsed+0x28/0x50 sound/core/pcm_lib.c:1848
loopback_jiffies_timer_function+0x1eb/0x270 sound/drivers/aloop.c:668
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x6b0/0xa90 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb6/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x1d7/0x93b kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu kernel/softirq.c:636 [inline]
irq_exit_rcu+0xf2/0x130 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
</IRQ>
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:717
Code: 1b 51 88 f8 e9 6f fe ff ff e8 11 51 88 f8 e9 3d fe ff ff e8 17
31 fd ff cc cc cc cc cc cc cc eb 07 0f 00 2d 47 99 50 00 fb f4 <c3> 0f
1f 40 00 41 54 be 08 00 00 00 53 65 48 8b 1c 25 40 f0 01 00
RSP: 0018:ffffffff8b607e28 EFLAGS: 00000206
RAX: 00000000001543c3 RBX: 0000000000000000 RCX: ffffffff8932d572
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100c7c6542
R10: ffff888063e32a0b R11: ffffed100c7c6541 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8d6d8590 R15: 0000000000000000
default_idle_call+0xc4/0x420 kernel/sched/idle.c:112
cpuidle_idle_call kernel/sched/idle.c:194 [inline]
do_idle+0x3f9/0x570 kernel/sched/idle.c:306
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403
start_kernel+0x47a/0x49b init/main.c:1141
secondary_startup_64_no_verify+0xb0/0xbb
----------------
Code disassembly (best guess):
0: 1b 51 88 sbb -0x78(%rcx),%edx
3: f8 clc
4: e9 6f fe ff ff jmpq 0xfffffe78
9: e8 11 51 88 f8 callq 0xf888511f
e: e9 3d fe ff ff jmpq 0xfffffe50
13: e8 17 31 fd ff callq 0xfffd312f
18: cc int3
19: cc int3
1a: cc int3
1b: cc int3
1c: cc int3
1d: cc int3
1e: cc int3
1f: eb 07 jmp 0x28
21: 0f 00 2d 47 99 50 00 verw 0x509947(%rip) # 0x50996f
28: fb sti
29: f4 hlt
* 2a: c3 retq <-- trapping instruction
2b: 0f 1f 40 00 nopl 0x0(%rax)
2f: 41 54 push %r12
31: be 08 00 00 00 mov $0x8,%esi
36: 53 push %rbx
37: 65 48 8b 1c 25 40 f0 mov %gs:0x1f040,%rbx
3e: 01 00
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