syzbot

loop3: detected capacity change from 0 to 1024
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 0 PID: 4833 at kernel/locking/mutex.c:582 __mutex_lock_common kernel/locking/mutex.c:582 [inline]
WARNING: CPU: 0 PID: 4833 at kernel/locking/mutex.c:582 __mutex_lock+0xb85/0xcc0 kernel/locking/mutex.c:747
Modules linked in:
CPU: 0 PID: 4833 Comm: syz.3.13893 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 04 cf fb 03 00 0f 85 95 f5 ff ff 48 c7 c7 80 b6 ca 8a 48 c7 c6 20 b7 ca 8a e8 6b 47 c1 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:ffffc9000bc87980 EFLAGS: 00010246
RAX: e4d90447b9af8900 RBX: ffff88805b08f828 RCX: 0000000000080000
RDX: ffffc9000ddfc000 RSI: 0000000000004878 RDI: 0000000000004879
RBP: ffffc9000bc87ae0 R08: ffff8880b8e28c13 R09: 1ffff110171c5182
R10: dffffc0000000000 R11: ffffed10171c5183 R12: 0000000000000000
R13: 1ffff92001790f40 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007fce7a72f6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2de19ff8 CR3: 000000004c83b000 CR4: 00000000003506f0
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_mknodat+0x18b/0x500 fs/namei.c:4036
 __do_sys_mknod fs/namei.c:4082 [inline]
 __se_sys_mknod fs/namei.c:4080 [inline]
 __x64_sys_mknod+0x8e/0xa0 fs/namei.c:4080
 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: 0033:0x7fce7979ce59
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:00007fce7a72f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007fce79a15fa0 RCX: 00007fce7979ce59
RDX: 0000000000000706 RSI: 0000000000002000 RDI: 0000200000000440
RBP: 00007fce79832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fce79a16038 R14: 00007fce79a15fa0 R15: 00007ffe69bb8fe8
 </TASK>