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: 0 PID: 5014 Comm: syz-executor384 Not tainted 6.3.0-syzkaller-12049-g58390c8ce1bd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
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+0x95b/0x1840 fs/reiserfs/tail_conversion.c:119
Code: 49 c1 e7 04 4a 8d 5c 39 08 48 89 d8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 3d 03 00 00 48 63 1b 49 83 c5 28 4c 89 e8 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 ef e8 87 9a b2 ff 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90003bef0a0 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000000 RCX: ffffc90003bef678
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000008
RBP: ffffc90003bef230 R08: ffffffff8230df7f R09: ffffffff823003fd
R10: 0000000000000002 R11: ffff88801f601dc0 R12: 0000000000000001
R13: 0000000000000028 R14: 0000000000000000 R15: 0000000000000010
FS:  00007f8b3d69e700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8b3d735e10 CR3: 0000000022b71000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 reiserfs_get_block+0x4c34/0x5130 fs/reiserfs/inode.c:949
 __block_write_begin_int+0x548/0x1a50 fs/buffer.c:2064
 reiserfs_write_begin+0x24d/0x520 fs/reiserfs/inode.c:2773
 generic_cont_expand_simple+0x18b/0x2a0 fs/buffer.c:2425
 reiserfs_setattr+0x57d/0x1140 fs/reiserfs/inode.c:3303
 notify_change+0xc8b/0xf40 fs/attr.c:483
 do_truncate+0x220/0x300 fs/open.c:66
 do_sys_ftruncate+0x2e4/0x380 fs/open.c:194
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8b3d6f2ba9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 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:00007f8b3d69e2f8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007f8b3d7787a0 RCX: 00007f8b3d6f2ba9
RDX: 00007f8b3d6f2ba9 RSI: 0000000000000f88 RDI: 0000000000000004
RBP: 00007f8b3d7451b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
R13: 7366726573696572 R14: 6576652e73646970 R15: 00007f8b3d7787a8
 </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+0x95b/0x1840 fs/reiserfs/tail_conversion.c:119
Code: 49 c1 e7 04 4a 8d 5c 39 08 48 89 d8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 3d 03 00 00 48 63 1b 49 83 c5 28 4c 89 e8 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 ef e8 87 9a b2 ff 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90003bef0a0 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000000 RCX: ffffc90003bef678
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000008
RBP: ffffc90003bef230 R08: ffffffff8230df7f R09: ffffffff823003fd
R10: 0000000000000002 R11: ffff88801f601dc0 R12: 0000000000000001
R13: 0000000000000028 R14: 0000000000000000 R15: 0000000000000010
FS:  00007f8b3d69e700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8b3d735e10 CR3: 0000000022b71000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	49 c1 e7 04          	shl    $0x4,%r15
   4:	4a 8d 5c 39 08       	lea    0x8(%rcx,%r15,1),%rbx
   9:	48 89 d8             	mov    %rbx,%rax
   c:	48 c1 e8 03          	shr    $0x3,%rax
  10:	0f b6 04 10          	movzbl (%rax,%rdx,1),%eax
  14:	84 c0                	test   %al,%al
  16:	0f 85 3d 03 00 00    	jne    0x359
  1c:	48 63 1b             	movslq (%rbx),%rbx
  1f:	49 83 c5 28          	add    $0x28,%r13
  23:	4c 89 e8             	mov    %r13,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 10 00          	cmpb   $0x0,(%rax,%rdx,1) <-- trapping instruction
  2e:	74 12                	je     0x42
  30:	4c 89 ef             	mov    %r13,%rdi
  33:	e8 87 9a b2 ff       	callq  0xffb29abf
  38:	48                   	rex.W
  39:	ba 00 00 00 00       	mov    $0x0,%edx
  3e:	00 fc                	add    %bh,%ah