syzbot

loop5: detected capacity change from 0 to 64
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 1 PID: 22228 at kernel/locking/mutex.c:582 __mutex_lock_common kernel/locking/mutex.c:582 [inline]
WARNING: CPU: 1 PID: 22228 at kernel/locking/mutex.c:582 __mutex_lock+0xa32/0xaf0 kernel/locking/mutex.c:747
Modules linked in:
CPU: 1 PID: 22228 Comm: syz.5.7625 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:582 [inline]
RIP: 0010:__mutex_lock+0xa32/0xaf0 kernel/locking/mutex.c:747
Code: 04 28 84 c0 0f 85 b7 00 00 00 83 3d 8f a0 ea 03 00 0f 85 df f6 ff ff 48 c7 c7 a0 fc 8b 8a 48 c7 c6 40 fd 8b 8a e8 4e 8d 18 f7 <0f> 0b e9 c5 f6 ff ff 0f 0b e9 6b f9 ff ff 48 c7 c1 40 a1 bf 96 80
RSP: 0018:ffffc900061df5a0 EFLAGS: 00010246
RAX: 190e2e990b149b00 RBX: ffff8880281e7028 RCX: 0000000000080000
RDX: ffffc9000d1a1000 RSI: 0000000000005067 RDI: 0000000000005068
RBP: ffffc900061df700 R08: ffff8880b8f279db R09: 1ffff110171e4f3b
R10: dffffc0000000000 R11: ffffed10171e4f3c R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880281e70b8 R15: 0000000000000000
FS:  00007f3822ff26c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff02a5456b8 CR3: 00000000622ef000 CR4: 00000000003506e0
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+0x18a/0x480 fs/reiserfs/namei.c:364
 __lookup_slow+0x29d/0x3f0 fs/namei.c:1698
 lookup_slow+0x53/0x70 fs/namei.c:1715
 walk_component fs/namei.c:2006 [inline]
 link_path_walk+0x945/0xe70 fs/namei.c:2333
 path_lookupat+0x9d/0x440 fs/namei.c:2486
 filename_lookup+0x224/0x560 fs/namei.c:2516
 user_path_at_empty+0x3e/0x60 fs/namei.c:2913
 user_path_at include/linux/namei.h:57 [inline]
 do_sys_truncate+0xb6/0x1c0 fs/open.c:132
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f382219acb9
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:00007f3822ff2028 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007f3822415fa0 RCX: 00007f382219acb9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000200000000100
RBP: 00007f3822208bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3822416038 R14: 00007f3822415fa0 R15: 00007fffc692f078
 </TASK>