syzbot

loop2: detected capacity change from 0 to 1024
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 1 PID: 27669 at kernel/locking/mutex.c:582 __mutex_lock_common kernel/locking/mutex.c:582 [inline]
WARNING: CPU: 1 PID: 27669 at kernel/locking/mutex.c:582 __mutex_lock+0xb85/0xcc0 kernel/locking/mutex.c:747
Modules linked in:
CPU: 1 PID: 27669 Comm: syz.2.9623 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:582 [inline]
RIP: 0010:__mutex_lock+0xb85/0xcc0 kernel/locking/mutex.c:747
Code: 04 08 84 c0 0f 85 27 01 00 00 83 3d 84 be fa 03 00 0f 85 95 f5 ff ff 48 c7 c7 80 b6 ca 8a 48 c7 c6 20 b7 ca 8a e8 1b 17 c0 f6 <0f> 0b e9 7b f5 ff ff 0f 0b e9 5f f9 ff ff 0f 0b e9 18 f6 ff ff e8
RSP: 0018:ffffc900054cf9a0 EFLAGS: 00010246
RAX: f87a89a93b399100 RBX: ffff88807bebe828 RCX: 0000000000080000
RDX: ffffc9000d31b000 RSI: 0000000000006e3a RDI: 0000000000006e3b
RBP: ffffc900054cfb00 R08: ffff8880b8f28c13 R09: 1ffff110171e5182
R10: dffffc0000000000 R11: ffffed10171e5183 R12: 0000000000000000
R13: 1ffff92000a99f44 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f2510eee6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd5385e8158 CR3: 0000000019a6e000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 reiserfs_write_lock+0x79/0xd0 fs/reiserfs/lock.c:27
 reiserfs_lookup+0x183/0x580 fs/reiserfs/namei.c:364
 lookup_one_qstr_excl+0x112/0x250 fs/namei.c:1617
 filename_create+0x23e/0x480 fs/namei.c:3891
 do_symlinkat+0xc5/0x400 fs/namei.c:4500
 __do_sys_symlink fs/namei.c:4528 [inline]
 __se_sys_symlink fs/namei.c:4526 [inline]
 __x64_sys_symlink+0x7e/0x90 fs/namei.c:4526
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f250ff9ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2510eee028 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00007f2510215fa0 RCX: 00007f250ff9ce59
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000200000001640
RBP: 00007f2510032d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2510216038 R14: 00007f2510215fa0 R15: 00007ffd4668adc8
 </TASK>