[v6.1] WARNING in ovl_workdir_create (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: ac7079a42ea5 Linux 6.1.137
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=148f34f4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=51883bd03903e09
dashboard link: https://syzkaller.appspot.com/bug?extid=5c6f6e527ac988ea4d9f
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
userspace arch: arm64

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/309e93338812/disk-ac7079a4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/869869c85b32/vmlinux-ac7079a4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d4b50ed751d5/Image-ac7079a4.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5c6f6e...@syzkaller.appspotmail.com

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DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff0000e0dd8330, owner = 0x1, curr 0xffff0000d10d0000, list empty
WARNING: CPU: 1 PID: 5271 at kernel/locking/rwsem.c:1372 __up_write kernel/locking/rwsem.c:1371 [inline]
WARNING: CPU: 1 PID: 5271 at kernel/locking/rwsem.c:1372 up_write+0x494/0x5c0 kernel/locking/rwsem.c:1626
Modules linked in:
CPU: 1 PID: 5271 Comm: syz.4.249 Not tainted 6.1.137-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __up_write kernel/locking/rwsem.c:1371 [inline]
pc : up_write+0x494/0x5c0 kernel/locking/rwsem.c:1626
lr : __up_write kernel/locking/rwsem.c:1371 [inline]
lr : up_write+0x494/0x5c0 kernel/locking/rwsem.c:1626
sp : ffff800021147440
x29: ffff800021147450 x28: 0000000000000004 x27: dfff800000000000
x26: dfff800000000000 x25: 1fffe0001c1bb073 x24: ffff0000e0dd8388
x23: 0000000000000000 x22: 0000000000000001 x21: ffff0000d10d0000
x20: ffff0000e0dd8330 x19: ffff0000e0dd8330 x18: ffff800011a7bd00
x17: 1fffe000367c6d76 x16: ffff8000082d1c08 x15: 0000000040000000
x14: 0000000000000002 x13: 1ffff00002a0e0b1 x12: 0000000000ff0100
x11: ff0080000a889074 x10: 0000000000000003 x9 : fd6a3b25a8d94c00
x8 : fd6a3b25a8d94c00 x7 : ffff8000082516e4 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000007 x1 : ffff800011a7d800 x0 : ffff80019ee71000
Call trace:
__up_write kernel/locking/rwsem.c:1371 [inline]
up_write+0x494/0x5c0 kernel/locking/rwsem.c:1626
inode_unlock include/linux/fs.h:763 [inline]
ovl_workdir_create+0x57c/0x634 fs/overlayfs/super.c:842
ovl_make_workdir fs/overlayfs/super.c:1389 [inline]
ovl_get_workdir+0x2fc/0x1068 fs/overlayfs/super.c:1539
ovl_fill_super+0x139c/0x2294 fs/overlayfs/super.c:2095
mount_nodev+0x68/0x104 fs/super.c:1489
ovl_mount+0x3c/0x50 fs/overlayfs/super.c:2186
legacy_get_tree+0xd4/0x16c fs/fs_context.c:632
vfs_get_tree+0x90/0x274 fs/super.c:1573
do_new_mount+0x228/0x810 fs/namespace.c:3057
path_mount+0x5b4/0xe78 fs/namespace.c:3387
do_mount fs/namespace.c:3400 [inline]
__do_sys_mount fs/namespace.c:3608 [inline]
__se_sys_mount fs/namespace.c:3585 [inline]
__arm64_sys_mount+0x49c/0x584 fs/namespace.c:3585
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 17500
hardirqs last enabled at (17499): [<ffff800008251778>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1367 [inline]
hardirqs last enabled at (17499): [<ffff800008251778>] finish_lock_switch+0xb0/0x1c4 kernel/sched/core.c:5003
hardirqs last disabled at (17500): [<ffff800011914018>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last enabled at (15794): [<ffff8000080306dc>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (15792): [<ffff8000080306a8>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.