loop0: detected capacity change from 0 to 64
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 1 PID: 21020 at kernel/locking/mutex.c:575 __mutex_lock_common+0x1a52/0x25a0 kernel/locking/mutex.c:575
Modules linked in:
CPU: 1 PID: 21020 Comm: syz.0.7112 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__mutex_lock_common+0x1a52/0x25a0 kernel/locking/mutex.c:575
Code: 04 08 84 c0 0f 85 d9 08 00 00 83 3d bf bc c2 03 00 0f 85 e9 e6 ff ff 48 c7 c7 80 1a ab 8a 48 c7 c6 c0 1a ab 8a e8 be 20 04 f7 <0f> 0b e9 cf e6 ff ff e8 22 8e b8 f6 e9 58 fb ff ff 0f 0b e9 d1 f0
RSP: 0018:ffffc900033ff960 EFLAGS: 00010246
RAX: af012b12b7234b00 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc90003cb3000 RSI: 00000000000051ae RDI: 00000000000051af
RBP: ffffc900033ffad0 R08: ffffffff8166aa8c R09: ffffed10171e4f24
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffff88807bdd8028 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f13721e46c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc57d3935a0 CR3: 000000001f3d5000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 reiserfs_write_lock+0x76/0xd0 fs/reiserfs/lock.c:27
 reiserfs_lookup+0x15c/0x4b0 fs/reiserfs/namei.c:364
 lookup_one_qstr_excl+0x117/0x240 fs/namei.c:1563
 filename_create+0x293/0x530 fs/namei.c:3836
 do_mkdirat+0xb3/0x520 fs/namei.c:4080
 __do_sys_mkdirat fs/namei.c:4105 [inline]
 __se_sys_mkdirat fs/namei.c:4103 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4103
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f13743799d7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 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:00007f13721e3e68 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f13721e3ef0 RCX: 00007f13743799d7
RDX: 00000000000001ff RSI: 0000400000000040 RDI: 00000000ffffff9c
RBP: 0000400000000140 R08: 00004000000000c0 R09: 0000000000000000
R10: 0000400000000140 R11: 0000000000000246 R12: 0000400000000040
R13: 00007f13721e3eb0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>