Re: [syzbot] kernel BUG in add_to_queue

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    65762d97e6fa Merge branch 'for-next/perf' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=12198e75880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=56d0c7c3a2304e8f
dashboard link: https://syzkaller.appspot.com/bug?extid=8a4b520a9affc6d8ea56
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=146e6e75880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1762a3ed880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/52f702197b30/disk-65762d97.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/72189c2789ce/vmlinux-65762d97.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ec0349196c98/Image-65762d97.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/9fcb4ad786f5/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8a4b520a9affc6d8ea56@xxxxxxxxxxxxxxxxxxxxxxxxx

gfs2: fsid=syz:syz.0: G:  s:EX n:8/1 f:qb t:EX d:EX/0 a:0 v:0 r:5 m:20 p:0
gfs2: fsid=syz:syz.0:  H: s:EX f:cH e:0 p:3074 [syz-executor203] gfs2_quota_sync+0xf0/0x204 fs/gfs2/quota.c:1318
------------[ cut here ]------------
kernel BUG at fs/gfs2/glock.c:1560!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 3074 Comm: syz-executor203 Not tainted 6.1.0-rc6-syzkaller-32653-g65762d97e6fa #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : add_to_queue+0x6ec/0x780 fs/gfs2/glock.c:1559
lr : add_to_queue+0x6ec/0x780 fs/gfs2/glock.c:1559
sp : ffff800012deb950
x29: ffff800012deb960 x28: ffff0000cbfa6e80 x27: ffff0000ccea2000
x26: ffff0000cbfa6e80 x25: 0000000000000400 x24: ffff0000c207a800
x23: 0000000000000000 x22: ffff0000c207a800 x21: ffff0000ccea3270
x20: ffff0000cbfa6eb8 x19: ffff0000c70fc550 x18: 00000000000000c0
x17: 5d333032726f7475 x16: ffff80000dbe6158 x15: ffff0000c4248000
x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c4248000
x11: ff8080000926a440 x10: 0000000000000000 x9 : 739e9965397fe700
x8 : 739e9965397fe700 x7 : ffff80000c08e4f4 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 add_to_queue+0x6ec/0x780 fs/gfs2/glock.c:1559
 gfs2_glock_nq+0x90/0x220 fs/gfs2/glock.c:1585
 gfs2_glock_nq_init fs/gfs2/glock.h:264 [inline]
 do_sync+0x1dc/0x650 fs/gfs2/quota.c:910
 gfs2_quota_sync+0xf0/0x204 fs/gfs2/quota.c:1318
 gfs2_sync_fs+0x30/0x78 fs/gfs2/super.c:643
 sync_filesystem+0x68/0x134 fs/sync.c:56
 generic_shutdown_super+0x38/0x198 fs/super.c:474
 kill_block_super+0x30/0x78 fs/super.c:1428
 gfs2_kill_sb+0x68/0x78
 deactivate_locked_super+0x70/0xe8 fs/super.c:332
 deactivate_super+0xd0/0xd4 fs/super.c:363
 cleanup_mnt+0x184/0x1c0 fs/namespace.c:1186
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193
 task_work_run+0x100/0x148 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0x2dc/0xcac kernel/exit.c:820
 __arm64_sys_exit_group+0x0/0x18 kernel/exit.c:950
 __do_sys_exit_group kernel/exit.c:961 [inline]
 __se_sys_exit_group kernel/exit.c:959 [inline]
 __wake_up_parent+0x0/0x40 kernel/exit.c:959
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584
Code: 52800022 aa1f03e0 aa1303e1 97fff219 (d4210000) 
---[ end trace 0000000000000000 ]---