------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff88805c6c5058, owner = 0x0, curr 0xffff88802a8f1e40, list empty
WARNING: kernel/locking/rwsem.c:1381 at __up_write kernel/locking/rwsem.c:1380 [inline], CPU#0: syz.8.2548/19811
WARNING: kernel/locking/rwsem.c:1381 at up_write+0x3a2/0x420 kernel/locking/rwsem.c:1643, CPU#0: syz.8.2548/19811
Modules linked in:
CPU: 0 UID: 0 PID: 19811 Comm: syz.8.2548 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__up_write kernel/locking/rwsem.c:1380 [inline]
RIP: 0010:up_write+0x3a2/0x420 kernel/locking/rwsem.c:1643
Code: d0 48 c7 c7 80 ff aa 8b 48 c7 c6 a0 01 ab 8b 48 8b 14 24 4c 89 f1 4d 89 e0 4c 8b 4c 24 08 41 52 e8 83 36 e6 ff 48 83 c4 08 90 <0f> 0b 90 90 e9 6d fd ff ff 48 c7 c1 74 87 c3 8f 80 e1 07 80 c1 03
RSP: 0018:ffffc900033f7c28 EFLAGS: 00010286
RAX: 6c3daad325d85d00 RBX: ffff88805c6c5058 RCX: 0000000000080000
RDX: ffffc9001fb1f000 RSI: 000000000000a150 RDI: 000000000000a151
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1c3a65c R12: 0000000000000000
R13: ffff88805c6c50b0 R14: ffff88805c6c5058 R15: 1ffff1100b8d8a0c
FS:  00007fd8b3e546c0(0000) GS:ffff8881259fc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558f2c4608 CR3: 00000000297b6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:990 [inline]
 __unlock_mount fs/namespace.c:2789 [inline]
 unlock_mount+0xbd/0x3a0 fs/namespace.c:2799
 do_new_mount_fc fs/namespace.c:3672 [inline]
 do_new_mount+0x72e/0x9e0 fs/namespace.c:3725
 do_mount fs/namespace.c:4048 [inline]
 __do_sys_mount fs/namespace.c:4236 [inline]
 __se_sys_mount+0x313/0x410 fs/namespace.c:4213
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd8b2f8eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd8b3e54038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fd8b31e6090 RCX: 00007fd8b2f8eec9
RDX: 0000200000000080 RSI: 0000200000003c40 RDI: 0000000000000000
RBP: 00007fd8b3011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd8b31e6128 R14: 00007fd8b31e6090 R15: 00007ffc7ecf6518
 </TASK>