[v5.15] WARNING in unlock_mount

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: f6f7927ac664 Linux 5.15.127
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1163b340680000
kernel config: https://syzkaller.appspot.com/x/.config?x=55f355732ad067d7
dashboard link: https://syzkaller.appspot.com/bug?extid=b12591e6da843405b9eb
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ca3051001874/disk-f6f7927a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fb0f8818e6e8/vmlinux-f6f7927a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/05e287cf01c6/Image-f6f7927a.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b12591...@syzkaller.appspotmail.com

------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff00010707f1d0, owner = 0x0, curr 0xffff0000d1118000, list empty
WARNING: CPU: 1 PID: 6286 at kernel/locking/rwsem.c:1342 __up_write kernel/locking/rwsem.c:1341 [inline]
WARNING: CPU: 1 PID: 6286 at kernel/locking/rwsem.c:1342 up_write+0x384/0x438 kernel/locking/rwsem.c:1594
Modules linked in:
CPU: 1 PID: 6286 Comm: syz-executor.1 Not tainted 5.15.127-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __up_write kernel/locking/rwsem.c:1341 [inline]
pc : up_write+0x384/0x438 kernel/locking/rwsem.c:1594
lr : __up_write kernel/locking/rwsem.c:1341 [inline]
lr : up_write+0x384/0x438 kernel/locking/rwsem.c:1594
sp : ffff80001f1c7a30
x29: ffff80001f1c7a40 x28: 1ffff00003e38f60 x27: 1fffe000180a67ac
x26: dfff800000000000 x25: 1fffe00020e0fe47 x24: ffff00010707f228
x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000d1118000
x20: ffff00010707f1d0 x19: ffff00010707f1d0 x18: 1fffe00036902f8e
x17: 1fffe00036902f8e x16: ffff800011967c34 x15: ffff80001499f180
x14: 1ffff0000292006a x13: ffffffffffffffff x12: 0000000000040000
x11: 0000000000008189 x10: ffff8000203bc000 x9 : ea59b9406e7d2b00
x8 : ea59b9406e7d2b00 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff80000a958780
x2 : ffff0001b4817d10 x1 : 0000000100000000 x0 : 00000000000000bd
Call trace:
__up_write kernel/locking/rwsem.c:1341 [inline]
up_write+0x384/0x438 kernel/locking/rwsem.c:1594
inode_unlock include/linux/fs.h:792 [inline]
unlock_mount+0x1d8/0x244 fs/namespace.c:2281
do_new_mount_fc fs/namespace.c:2943 [inline]
do_new_mount+0x6e4/0x8c4 fs/namespace.c:2996
path_mount+0x590/0x104c fs/namespace.c:3324
do_mount fs/namespace.c:3337 [inline]
__do_sys_mount fs/namespace.c:3545 [inline]
__se_sys_mount fs/namespace.c:3522 [inline]
__arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3522
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
irq event stamp: 156
hardirqs last enabled at (155): [<ffff800008268c74>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1338 [inline]
hardirqs last enabled at (155): [<ffff800008268c74>] finish_lock_switch+0xbc/0x1e8 kernel/sched/core.c:4780
hardirqs last disabled at (156): [<ffff8000119632c8>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:387
softirqs last enabled at (8): [<ffff8000080300b4>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31
softirqs last disabled at (6): [<ffff800008030080>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18
---[ end trace ba2213d414171b78 ]---


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[syzbot]

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