[syzbot] [reiserfs?] panic: item_ops-NUM direntry_check_left: free space NUM, entry_count NUM

[syzbot <syzbot+3f480503caba4b4b47c5@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    c96618275234 Fix up more non-executable files marked execu..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10db6a69480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c8d5c2ee6c2bd4b8
dashboard link: https://syzkaller.appspot.com/bug?extid=3f480503caba4b4b47c5
compiler:       Debian clang version 13.0.1-6~deb11u1, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a829cd39e940/disk-c9661827.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/abbc86f52a98/vmlinux-c9661827.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ab0970dd4f84/bzImage-c9661827.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3f480503caba4b4b47c5@syzkaller.appspotmail.com

REISERFS (device loop3): checking transaction log (loop3)
REISERFS (device loop3): Using r5 hash to sort names
REISERFS (device loop3): Created .reiserfs_priv - reserved for xattr storage.
REISERFS warning: vs-16090 direntry_bytes_number: bytes number is asked for direntry
REISERFS panic: item_ops-1 direntry_check_left: free space 16, entry_count 4
------------[ cut here ]------------
kernel BUG at fs/reiserfs/prints.c:390!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8130 Comm: syz-executor.3 Not tainted 6.2.0-rc5-syzkaller-00205-gc96618275234 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0010:__reiserfs_panic+0xea/0x140 fs/reiserfs/prints.c:390
Code: 48 c7 c2 00 51 03 8b 48 0f 44 d0 48 0f 44 d8 48 c7 c7 20 52 03 8b 48 89 de 4c 89 f1 49 c7 c0 40 76 16 92 31 c0 e8 96 3a 83 08 <0f> 0b e8 9f bb 5f ff 49 81 c7 a8 06 00 00 48 85 db 48 c7 c0 e0 50
RSP: 0018:ffffc9000a3ee980 EFLAGS: 00010246
RAX: 000000000000004c RBX: ffffffff8b03be20 RCX: ad4adfe0867ba200
RDX: ffffc9000bd4b000 RSI: 0000000000008492 RDI: 0000000000008493
RBP: ffffc9000a3eea68 R08: ffffffff816f2b8d R09: fffff5200147dce9
R10: fffff5200147dce9 R11: 1ffff9200147dce8 R12: ffffffff8b03be40
R13: ffffc9000a3ee9a0 R14: ffffffff8cc75f06 R15: 0000000000000000
FS:  00007fc01024f700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32823000 CR3: 000000007dd96000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 direntry_check_left+0x315/0x320 fs/reiserfs/item_ops.c:542
 check_left+0x4e2/0x730 fs/reiserfs/fix_node.c:265
 ip_check_balance fs/reiserfs/fix_node.c:1420 [inline]
 check_balance fs/reiserfs/fix_node.c:2083 [inline]
 fix_nodes+0x1d3d/0x8560 fs/reiserfs/fix_node.c:2635
 reiserfs_paste_into_item+0x662/0x880 fs/reiserfs/stree.c:2130
 reiserfs_get_block+0x223f/0x5180 fs/reiserfs/inode.c:1069
 __block_write_begin_int+0x54c/0x1a80 fs/buffer.c:1991
 reiserfs_write_begin+0x247/0x510 fs/reiserfs/inode.c:2775
 generic_cont_expand_simple+0x151/0x250 fs/buffer.c:2347
 reiserfs_setattr+0x642/0x1200 fs/reiserfs/inode.c:3305
 notify_change+0xe50/0x1100 fs/attr.c:482
 do_truncate+0x200/0x2f0 fs/open.c:65
 do_sys_ftruncate+0x2b0/0x350 fs/open.c:193
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc00f48c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc01024f168 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007fc00f5abf80 RCX: 00007fc00f48c0c9
RDX: 0000000000000000 RSI: 0000000002007ffb RDI: 0000000000000006
RBP: 00007fc00f4e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd3617badf R14: 00007fc01024f300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__reiserfs_panic+0xea/0x140 fs/reiserfs/prints.c:390
Code: 48 c7 c2 00 51 03 8b 48 0f 44 d0 48 0f 44 d8 48 c7 c7 20 52 03 8b 48 89 de 4c 89 f1 49 c7 c0 40 76 16 92 31 c0 e8 96 3a 83 08 <0f> 0b e8 9f bb 5f ff 49 81 c7 a8 06 00 00 48 85 db 48 c7 c0 e0 50
RSP: 0018:ffffc9000a3ee980 EFLAGS: 00010246
RAX: 000000000000004c RBX: ffffffff8b03be20 RCX: ad4adfe0867ba200
RDX: ffffc9000bd4b000 RSI: 0000000000008492 RDI: 0000000000008493
RBP: ffffc9000a3eea68 R08: ffffffff816f2b8d R09: fffff5200147dce9
R10: fffff5200147dce9 R11: 1ffff9200147dce8 R12: ffffffff8b03be40
R13: ffffc9000a3ee9a0 R14: ffffffff8cc75f06 R15: 0000000000000000
FS:  00007fc01024f700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8fb71de000 CR3: 000000007dd96000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.