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BUG: stack guard page was hit in glock_work_func

Status: moderation: reported on 2026/01/27 19:38
Subsystems: gfs2
[Documentation on labels]
Reported-by: syzbot+63165dd843ccb75524bc@syzkaller.appspotmail.com
First crash: 4d11h, last: 4d11h

Sample crash report:
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
 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
 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

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/23 19:35 linux-next a0c666c25aee 3181850c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: stack guard page was hit in glock_work_func
* Struck through repros no longer work on HEAD.