[moderation] [gfs2?] BUG: stack guard page was hit in glock_work_func

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a0c666c25aee Add linux-next specific files for 20260122
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11f0413a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=10f2b64f8f12b9a4
dashboard link: https://syzkaller.appspot.com/bug?extid=63165dd843ccb75524bc
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
CC: [agru...@redhat.com gf...@lists.linux.dev linux-...@vger.kernel.org]

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7bf5964c5e6b/disk-a0c666c2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/026b680c5016/vmlinux-a0c666c2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a3334233fb78/bzImage-a0c666c2.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+63165d...@syzkaller.appspotmail.com

BUG: TASK stack guard page was hit at ffffc900000fffd8 (stack is ffffc90000100000..ffffc90000108000)
Oops: stack guard page: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 11 Comm: kworker/0:0H Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
Workqueue: gfs2-glock/syz:syz glock_work_func
RIP: 0010:get_current arch/x86/include/asm/current.h:-1 [inline]
RIP: 0010:__lock_acquire+0x29/0x2cf0 kernel/locking/lockdep.c:5082
Code: 90 55 41 57 41 56 41 55 41 54 53 48 81 ec e8 00 00 00 65 48 8b 05 c7 42 53 11 48 89 84 24 e0 00 00 00 65 48 8b 05 9f 42 53 11 <48> 89 44 24 08 31 ed 83 3d 89 51 50 0e 00 0f 84 ef 13 00 00 45 89
RSP: 0018:ffffc900000fffe0 EFLAGS: 00010082
RAX: ffff88801de91e40 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807f734580
RBP: ffffffff840cd4bb R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88807f734580 R14: 0000000000000001 R15: 0000000000000246
FS: 0000000000000000(0000) GS:ffff8881256f0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc900000fffd8 CR3: 000000005e398000 CR4: 00000000003526f0
Call Trace:
<TASK>
lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868
__raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:344 [inline]
do_xmote+0x2bb/0x750 fs/gfs2/glock.c:696
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
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do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
do_xmote+0x4a0/0x750 fs/gfs2/glock.c:736
glock_work_func+0x2a8/0x580 fs/gfs2/glock.c:1010
process_one_work+0x949/0x15a0 kernel/workqueue.c:3279
process_scheduled_works kernel/workqueue.c:3362 [inline]
worker_thread+0x9af/0xee0 kernel/workqueue.c:3443
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:get_current arch/x86/include/asm/current.h:-1 [inline]
RIP: 0010:__lock_acquire+0x29/0x2cf0 kernel/locking/lockdep.c:5082
Code: 90 55 41 57 41 56 41 55 41 54 53 48 81 ec e8 00 00 00 65 48 8b 05 c7 42 53 11 48 89 84 24 e0 00 00 00 65 48 8b 05 9f 42 53 11 <48> 89 44 24 08 31 ed 83 3d 89 51 50 0e 00 0f 84 ef 13 00 00 45 89
RSP: 0018:ffffc900000fffe0 EFLAGS: 00010082
RAX: ffff88801de91e40 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807f734580
RBP: ffffffff840cd4bb R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88807f734580 R14: 0000000000000001 R15: 0000000000000246
FS: 0000000000000000(0000) GS:ffff8881256f0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc900000fffd8 CR3: 000000005e398000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 90 nop
1: 55 push %rbp
2: 41 57 push %r15
4: 41 56 push %r14
6: 41 55 push %r13
8: 41 54 push %r12
a: 53 push %rbx
b: 48 81 ec e8 00 00 00 sub $0xe8,%rsp
12: 65 48 8b 05 c7 42 53 mov %gs:0x115342c7(%rip),%rax # 0x115342e1
19: 11
1a: 48 89 84 24 e0 00 00 mov %rax,0xe0(%rsp)
21: 00
22: 65 48 8b 05 9f 42 53 mov %gs:0x1153429f(%rip),%rax # 0x115342c9
29: 11
* 2a: 48 89 44 24 08 mov %rax,0x8(%rsp) <-- trapping instruction
2f: 31 ed xor %ebp,%ebp
31: 83 3d 89 51 50 0e 00 cmpl $0x0,0xe505189(%rip) # 0xe5051c1
38: 0f 84 ef 13 00 00 je 0x142d
3e: 45 rex.RB
3f: 89 .byte 0x89


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