syzbot

loop5: detected capacity change from 0 to 128
VFS: Found a Xenix FS (block size = 1024) on device loop5
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DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 0 PID: 27633 at kernel/locking/mutex.c:582 __mutex_lock_common kernel/locking/mutex.c:582 [inline]
WARNING: CPU: 0 PID: 27633 at kernel/locking/mutex.c:582 __mutex_lock+0xa24/0xaf0 kernel/locking/mutex.c:747
Modules linked in:
CPU: 0 PID: 27633 Comm: syz.5.10046 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:582 [inline]
RIP: 0010:__mutex_lock+0xa24/0xaf0 kernel/locking/mutex.c:747
Code: 04 28 84 c0 0f 85 b7 00 00 00 83 3d 7d 04 ff 03 00 0f 85 e0 f6 ff ff 48 c7 c7 80 ef 8b 8a 48 c7 c6 20 f0 8b 8a e8 fc 64 2c f7 <0f> 0b e9 c6 f6 ff ff 0f 0b e9 6c f9 ff ff 48 c7 c1 40 91 be 96 80
RSP: 0018:ffffc90003ad79a0 EFLAGS: 00010246
RAX: bbf900b234909700 RBX: ffff88802f29b028 RCX: 0000000000080000
RDX: ffffc9001104b000 RSI: 0000000000004305 RDI: 0000000000004306
RBP: ffffc90003ad7b00 R08: dffffc0000000000 R09: fffff5200075aec5
R10: fffff5200075aec5 R11: 1ffff9200075aec4 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88802f29b0b8 R15: 0000000000000000
FS:  00007fc4c4dcd6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3e767c8000 CR3: 000000007b284000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 reiserfs_write_lock+0x75/0xd0 fs/reiserfs/lock.c:27
 reiserfs_lookup+0x137/0x420 fs/reiserfs/namei.c:364
 lookup_one_qstr_excl+0x10e/0x240 fs/namei.c:1605
 filename_create+0x21e/0x450 fs/namei.c:3877
 do_symlinkat+0xb9/0x3f0 fs/namei.c:4490
 __do_sys_symlink fs/namei.c:4522 [inline]
 __se_sys_symlink fs/namei.c:4520 [inline]
 __x64_sys_symlink+0x7a/0x90 fs/namei.c:4520
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc4c3f8eec9
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:00007fc4c4dcd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00007fc4c41e5fa0 RCX: 00007fc4c3f8eec9
RDX: 0000000000000000 RSI: 00002000000059c0 RDI: 00002000000049c0
RBP: 00007fc4c4011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc4c41e6038 R14: 00007fc4c41e5fa0 R15: 00007ffd0ca16758
 </TASK>