REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): using 3.5.x disk format
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 1 0(1) DIR], item_len 35, item_location 4029, free_space(entry_count) 2
REISERFS error (device loop0): vs-5150 search_by_key: invalid format found in block 532. Fsck?
REISERFS (device loop0): Remounting filesystem read-only
general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 1 PID: 5047 Comm: syz-executor986 Not tainted 6.4.0-rc6-syzkaller-00037-gb6dad5178cea #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:reiserfs_node_data fs/reiserfs/reiserfs.h:2184 [inline]
RIP: 0010:item_head fs/reiserfs/reiserfs.h:2200 [inline]
RIP: 0010:tp_item_head fs/reiserfs/reiserfs.h:2226 [inline]
RIP: 0010:direct2indirect+0x7c8/0x10f0 fs/reiserfs/tail_conversion.c:119
Code: 10 07 00 00 4c 89 e2 49 63 44 24 08 48 c1 ea 03 80 3c 1a 00 0f 85 04 07 00 00 4d 8b 24 24 49 8d 7c 24 28 48 89 fa 48 c1 ea 03 <80> 3c 1a 00 0f 85 00 07 00 00 48 8d 54 40 03 49 8b 44 24 28 4c 8d
RSP: 0018:ffffc90003c7f570 EFLAGS: 00010216
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000005 RSI: ffffffff8221f8f2 RDI: 0000000000000028
RBP: ffffc90003c7f948 R08: 0000000000000005 R09: 0000000000000001
R10: 00000000fffffffe R11: 0000000000000001 R12: 0000000000000000
R13: ffffc90003c7f620 R14: ffff888074310830 R15: ffffc90003c7f660
FS:  00007fcf05770700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcefd3c4000 CR3: 0000000021b83000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 reiserfs_get_block+0x366e/0x4100 fs/reiserfs/inode.c:949
 __block_write_begin_int+0x3bd/0x14b0 fs/buffer.c:2064
 reiserfs_write_begin+0x36e/0xa60 fs/reiserfs/inode.c:2773
 generic_cont_expand_simple+0x117/0x1f0 fs/buffer.c:2425
 reiserfs_setattr+0x395/0x1370 fs/reiserfs/inode.c:3303
 notify_change+0xb2c/0x1180 fs/attr.c:483
 do_truncate+0x143/0x200 fs/open.c:66
 do_sys_ftruncate+0x53a/0x770 fs/open.c:194
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fcf057c4599
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 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:00007fcf057702f8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007fcf0584a7a0 RCX: 00007fcf057c4599
RDX: 00007fcf057c4599 RSI: 0000000000000f88 RDI: 0000000000000004
RBP: 00007fcf058171b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
R13: 7366726573696572 R14: 6576652e73646970 R15: 00007fcf0584a7a8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:reiserfs_node_data fs/reiserfs/reiserfs.h:2184 [inline]
RIP: 0010:item_head fs/reiserfs/reiserfs.h:2200 [inline]
RIP: 0010:tp_item_head fs/reiserfs/reiserfs.h:2226 [inline]
RIP: 0010:direct2indirect+0x7c8/0x10f0 fs/reiserfs/tail_conversion.c:119
Code: 10 07 00 00 4c 89 e2 49 63 44 24 08 48 c1 ea 03 80 3c 1a 00 0f 85 04 07 00 00 4d 8b 24 24 49 8d 7c 24 28 48 89 fa 48 c1 ea 03 <80> 3c 1a 00 0f 85 00 07 00 00 48 8d 54 40 03 49 8b 44 24 28 4c 8d
RSP: 0018:ffffc90003c7f570 EFLAGS: 00010216
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000005 RSI: ffffffff8221f8f2 RDI: 0000000000000028
RBP: ffffc90003c7f948 R08: 0000000000000005 R09: 0000000000000001
R10: 00000000fffffffe R11: 0000000000000001 R12: 0000000000000000
R13: ffffc90003c7f620 R14: ffff888074310830 R15: ffffc90003c7f660
FS:  00007fcf05770700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcf05805c70 CR3: 0000000021b83000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	10 07                	adc    %al,(%rdi)
   2:	00 00                	add    %al,(%rax)
   4:	4c 89 e2             	mov    %r12,%rdx
   7:	49 63 44 24 08       	movslq 0x8(%r12),%rax
   c:	48 c1 ea 03          	shr    $0x3,%rdx
  10:	80 3c 1a 00          	cmpb   $0x0,(%rdx,%rbx,1)
  14:	0f 85 04 07 00 00    	jne    0x71e
  1a:	4d 8b 24 24          	mov    (%r12),%r12
  1e:	49 8d 7c 24 28       	lea    0x28(%r12),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 1a 00          	cmpb   $0x0,(%rdx,%rbx,1) <-- trapping instruction
  2e:	0f 85 00 07 00 00    	jne    0x734
  34:	48 8d 54 40 03       	lea    0x3(%rax,%rax,2),%rdx
  39:	49 8b 44 24 28       	mov    0x28(%r12),%rax
  3e:	4c                   	rex.WR
  3f:	8d                   	.byte 0x8d