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: 2 PID: 11700 Comm: syz-executor.0 Not tainted 6.7.0-rc8-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:reiserfs_node_data fs/reiserfs/reiserfs.h:2183 [inline]
RIP: 0010:item_head fs/reiserfs/reiserfs.h:2199 [inline]
RIP: 0010:tp_item_head fs/reiserfs/reiserfs.h:2225 [inline]
RIP: 0010:direct2indirect+0x817/0x10f0 fs/reiserfs/tail_conversion.c:119
Code: e5 06 00 00 4c 89 e2 49 63 44 24 08 48 c1 ea 03 80 3c 1a 00 0f 85 d9 06 00 00 4d 8b 24 24 49 8d 7c 24 28 48 89 fa 48 c1 ea 03 <80> 3c 1a 00 0f 85 d5 06 00 00 48 8d 54 40 03 49 8b 44 24 28 4c 8d
RSP: 0018:ffffc9000ed57550 EFLAGS: 00010206

RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffc90024415000
RDX: 0000000000000005 RSI: ffffffff82287a6f RDI: 0000000000000028
RBP: ffffc9000ed576e0 R08: 0000000000000005 R09: 0000000000000001
R10: 00000000fffffffe R11: 0000000000000007 R12: 0000000000000000
R13: ffff88802ef27970 R14: 0000000000000001 R15: ffffc9000ed57950
FS:  00007f60be1e46c0(0000) GS:ffff88806b800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33233000 CR3: 000000002d801000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 reiserfs_get_block+0x3a6e/0x4570 fs/reiserfs/inode.c:949
 __block_write_begin_int+0x3c0/0x1560 fs/buffer.c:2119
 reiserfs_write_begin+0x350/0x7d0 fs/reiserfs/inode.c:2767
 generic_perform_write+0x278/0x600 mm/filemap.c:3927
 __generic_file_write_iter+0x1f9/0x240 mm/filemap.c:4022
 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4048
 call_write_iter include/linux/fs.h:2020 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x64f/0xdf0 fs/read_write.c:584
 ksys_write+0x12f/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f60bd47cce9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f60be1e40c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f60bd59bf80 RCX: 00007f60bd47cce9
RDX: 0000000000000030 RSI: 0000000020000040 RDI: 0000000000000005
RBP: 00007f60bd4c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f60bd59bf80 R15: 00007ffdd7701158
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:reiserfs_node_data fs/reiserfs/reiserfs.h:2183 [inline]
RIP: 0010:item_head fs/reiserfs/reiserfs.h:2199 [inline]
RIP: 0010:tp_item_head fs/reiserfs/reiserfs.h:2225 [inline]
RIP: 0010:direct2indirect+0x817/0x10f0 fs/reiserfs/tail_conversion.c:119
Code: e5 06 00 00 4c 89 e2 49 63 44 24 08 48 c1 ea 03 80 3c 1a 00 0f 85 d9 06 00 00 4d 8b 24 24 49 8d 7c 24 28 48 89 fa 48 c1 ea 03 <80> 3c 1a 00 0f 85 d5 06 00 00 48 8d 54 40 03 49 8b 44 24 28 4c 8d
RSP: 0018:ffffc9000ed57550 EFLAGS: 00010206
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffc90024415000
RDX: 0000000000000005 RSI: ffffffff82287a6f RDI: 0000000000000028
RBP: ffffc9000ed576e0 R08: 0000000000000005 R09: 0000000000000001
R10: 00000000fffffffe R11: 0000000000000007 R12: 0000000000000000
R13: ffff88802ef27970 R14: 0000000000000001 R15: ffffc9000ed57950
FS:  00007f60be1e46c0(0000) GS:ffff88806b900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe5fcc4d48 CR3: 000000002d801000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e5 06                	in     $0x6,%eax
   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 d9 06 00 00    	jne    0x6f3
  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 d5 06 00 00    	jne    0x709
  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