syzbot

------------[ cut here ]------------
kernel BUG at fs/reiserfs/item_ops.c:569!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4373 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:direntry_check_right+0x262/0x270 fs/reiserfs/item_ops.c:569
Code: e9 4b ff ff ff 44 89 f9 80 e1 07 38 c1 0f 8c 51 ff ff ff be 04 00 00 00 4c 89 ff e8 38 46 b7 ff e9 3f ff ff ff e8 1e 14 67 ff <0f> 0b e8 17 14 67 ff 0f 0b 0f 1f 44 00 00 55 41 57 41 56 41 55 41
RSP: 0018:ffffc900032b72d8 EFLAGS: 00010293
RAX: ffffffff8219cbb2 RBX: dffffc0000000000 RCX: ffff888028df9dc0
RDX: 0000000000000000 RSI: 0000000000000018 RDI: 0000000000000044
RBP: ffff88807cc2c104 R08: ffff888028df9dc0 R09: 0000000000000002
R10: 0000000000000070 R11: 0000000000000000 R12: ffff88807cc2c0fe
R13: 0000000000000018 R14: fffffffffffffffd R15: 000000000000002c
FS:  0000555555e5b500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555e86648 CR3: 000000007b364000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 check_right+0x4ea/0x7f0 fs/reiserfs/fix_node.c:355
 dc_check_balance_leaf fs/reiserfs/fix_node.c:1983 [inline]
 dc_check_balance fs/reiserfs/fix_node.c:2039 [inline]
 check_balance fs/reiserfs/fix_node.c:2086 [inline]
 fix_nodes+0x3dc4/0x82d0 fs/reiserfs/fix_node.c:2635
 reiserfs_cut_from_item+0x2e8/0x1ef0 fs/reiserfs/stree.c:1742
 reiserfs_rmdir+0x3b3/0x700 fs/reiserfs/namei.c:959
 vfs_rmdir+0x36c/0x4d0 fs/namei.c:4199
 do_rmdir+0x288/0x5e0 fs/namei.c:4260
 __do_sys_unlinkat fs/namei.c:4440 [inline]
 __se_sys_unlinkat fs/namei.c:4434 [inline]
 __x64_sys_unlinkat+0xc0/0xe0 fs/namei.c:4434
 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: 0033:0x7f19fe98ed27
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 07 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:00007ffe02477218 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f19fe98ed27
RDX: 0000000000000200 RSI: 00007ffe024783c0 RDI: 00000000ffffff9c
RBP: 00007f19fea13d7d R08: 0000555555e7e66b R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000207 R12: 00007ffe024783c0
R13: 00007f19fea13d7d R14: 0000000000015a84 R15: 00007ffe0247a580
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:direntry_check_right+0x262/0x270 fs/reiserfs/item_ops.c:569
Code: e9 4b ff ff ff 44 89 f9 80 e1 07 38 c1 0f 8c 51 ff ff ff be 04 00 00 00 4c 89 ff e8 38 46 b7 ff e9 3f ff ff ff e8 1e 14 67 ff <0f> 0b e8 17 14 67 ff 0f 0b 0f 1f 44 00 00 55 41 57 41 56 41 55 41
RSP: 0018:ffffc900032b72d8 EFLAGS: 00010293
RAX: ffffffff8219cbb2 RBX: dffffc0000000000 RCX: ffff888028df9dc0
RDX: 0000000000000000 RSI: 0000000000000018 RDI: 0000000000000044
RBP: ffff88807cc2c104 R08: ffff888028df9dc0 R09: 0000000000000002
R10: 0000000000000070 R11: 0000000000000000 R12: ffff88807cc2c0fe
R13: 0000000000000018 R14: fffffffffffffffd R15: 000000000000002c
FS:  0000555555e5b500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555e86648 CR3: 000000007b364000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400