[syzbot] [dri?] [reiserfs?] WARNING: bad unlock balance in vkms_vblank_simulate
From: syzbot
Date: Sun Aug 13 2023 - 03:24:23 EST
Hello,
syzbot found the following issue on:
HEAD commit: 71cd4fc492ec Add linux-next specific files for 20230808
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11faa1eda80000
kernel config: https://syzkaller.appspot.com/x/.config?x=e36b5ba725f7349d
dashboard link: https://syzkaller.appspot.com/bug?extid=5671b8bcd5178fe56c23
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17a54d0ba80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13e2281ba80000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5ea26a69f422/disk-71cd4fc4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c4a6b00863bf/vmlinux-71cd4fc4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/888c2025ec30/bzImage-71cd4fc4.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/3620b064e309/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5671b8bcd5178fe56c23@xxxxxxxxxxxxxxxxxxxxxxxxx
=====================================
WARNING: bad unlock balance detected!
6.5.0-rc5-next-20230808-syzkaller #0 Not tainted
-------------------------------------
swapper/0/0 is trying to release lock (&vkms_out->enabled_lock) at:
[<ffffffff852badf9>] vkms_vblank_simulate+0x159/0x3d0 drivers/gpu/drm/vkms/vkms_crtc.c:34
but there are no more locks to release!
other info that might help us debug this:
no locks held by swapper/0/0.
stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.5.0-rc5-next-20230808-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
__lock_release kernel/locking/lockdep.c:5438 [inline]
lock_release+0x4b5/0x680 kernel/locking/lockdep.c:5781
__mutex_unlock_slowpath+0xa3/0x640 kernel/locking/mutex.c:907
vkms_vblank_simulate+0x159/0x3d0 drivers/gpu/drm/vkms/vkms_crtc.c:34
__run_hrtimer kernel/time/hrtimer.c:1688 [inline]
__hrtimer_run_queues+0x203/0xc10 kernel/time/hrtimer.c:1752
hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1098 [inline]
__sysvec_apic_timer_interrupt+0x14a/0x430 arch/x86/kernel/apic/apic.c:1115
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1109
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline]
RIP: 0010:acpi_safe_halt+0x1b/0x20 drivers/acpi/processor_idle.c:113
Code: ed c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 65 48 8b 04 25 c0 bc 03 00 48 8b 00 a8 08 75 0c 66 90 0f 00 2d 57 9d 99 00 fb f4 <fa> c3 0f 1f 00 0f b6 47 08 3c 01 74 0b 3c 02 74 05 8b 7f 04 eb 9f
RSP: 0000:ffffffff8c607d70 EFLAGS: 00000246
RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8a3a232e
RDX: 0000000000000001 RSI: ffff888144e77800 RDI: ffff888144e77864
RBP: ffff888144e77864 R08: 0000000000000001 R09: ffffed1017306dbd
R10: ffff8880b9836deb R11: 0000000000000000 R12: ffff888141ed8000
R13: ffffffff8d45c680 R14: 0000000000000000 R15: 0000000000000000
acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:707
cpuidle_enter_state+0x82/0x500 drivers/cpuidle/cpuidle.c:267
cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388
cpuidle_idle_call kernel/sched/idle.c:215 [inline]
do_idle+0x315/0x3f0 kernel/sched/idle.c:282
cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:379
rest_init+0x16f/0x2b0 init/main.c:726
arch_call_rest_init+0x13/0x30 init/main.c:823
start_kernel+0x39f/0x480 init/main.c:1068
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:556
x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:537
secondary_startup_64_no_verify+0x167/0x16b
</TASK>
----------------
Code disassembly (best guess):
0: ed in (%dx),%eax
1: c3 ret
2: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1)
9: 00 00 00 00
d: 66 90 xchg %ax,%ax
f: 65 48 8b 04 25 c0 bc mov %gs:0x3bcc0,%rax
16: 03 00
18: 48 8b 00 mov (%rax),%rax
1b: a8 08 test $0x8,%al
1d: 75 0c jne 0x2b
1f: 66 90 xchg %ax,%ax
21: 0f 00 2d 57 9d 99 00 verw 0x999d57(%rip) # 0x999d7f
28: fb sti
29: f4 hlt
* 2a: fa cli <-- trapping instruction
2b: c3 ret
2c: 0f 1f 00 nopl (%rax)
2f: 0f b6 47 08 movzbl 0x8(%rdi),%eax
33: 3c 01 cmp $0x1,%al
35: 74 0b je 0x42
37: 3c 02 cmp $0x2,%al
39: 74 05 je 0x40
3b: 8b 7f 04 mov 0x4(%rdi),%edi
3e: eb 9f jmp 0xffffffdf
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to change bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup