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Message-ID: <0000000000001ea6ee0605882795@google.com>
Date: Sat, 16 Sep 2023 23:29:50 -0700
From: syzbot <syzbot+204dd7e9a83cb8855b63@...kaller.appspotmail.com>
To: airlied@...il.com, daniel@...ll.ch,
dri-devel@...ts.freedesktop.org, hamohammed.sa@...il.com,
linux-kernel@...r.kernel.org, linux-next@...r.kernel.org,
mairacanal@...eup.net, melissa.srw@...il.com,
rodrigosiqueiramelo@...il.com, sfr@...b.auug.org.au,
syzkaller-bugs@...glegroups.com
Subject: [syzbot] [dri?] linux-next boot error: WARNING: bad unlock balance in vkms_vblank_simulate
Hello,
syzbot found the following issue on:
HEAD commit: e143016b56ec Add linux-next specific files for 20230913
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=164c5ac7a80000
kernel config: https://syzkaller.appspot.com/x/.config?x=76ee1517f109f01a
dashboard link: https://syzkaller.appspot.com/bug?extid=204dd7e9a83cb8855b63
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/845fe7fc2fee/disk-e143016b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d74646a84425/vmlinux-e143016b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/bfbe2696ea96/bzImage-e143016b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+204dd7e9a83cb8855b63@...kaller.appspotmail.com
=====================================
WARNING: bad unlock balance detected!
6.6.0-rc1-next-20230913-syzkaller #0 Not tainted
-------------------------------------
swapper/0/0 is trying to release lock (&vkms_out->enabled_lock) at:
[<ffffffff852f4539>] 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 6.6.0-rc1-next-20230913-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
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:5430 [inline]
lock_release+0x4b5/0x680 kernel/locking/lockdep.c:5773
__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:1063 [inline]
__sysvec_apic_timer_interrupt+0x105/0x3f0 arch/x86/kernel/apic/apic.c:1080
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1074
</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 17 b9 b2 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:ffffffff8c807d70 EFLAGS: 00000246
RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8a41858e
RDX: 0000000000000001 RSI: ffff88801368d800 RDI: ffff88801368d864
RBP: ffff88801368d864 R08: 0000000000000001 R09: ffffed1017306dbd
R10: ffff8880b9836deb R11: 0000000000000000 R12: ffff888017300000
R13: ffffffff8d661d60 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+0x166/0x16b
</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 17 b9 b2 00 verw 0xb2b917(%rip) # 0xb2b93f
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@...glegroups.com.
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 to overwrite 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
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