general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
CPU: 0 PID: 4308 Comm: syz.0.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:d_really_is_negative include/linux/dcache.h:476 [inline]
RIP: 0010:reiserfs_xattr_jcreate_nblocks fs/reiserfs/xattr.h:79 [inline]
RIP: 0010:reiserfs_xattr_set+0x379/0x590 fs/reiserfs/xattr.c:631
Code: f8 48 c1 e8 03 42 80 3c 28 00 4c 8d a4 24 80 00 00 00 74 08 4c 89 ff e8 45 85 bb ff 4d 8b 3f 49 83 c7 68 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 28 85 bb ff 48 83 7c 24 38 00 b8
RSP: 0018:ffffc90002e8f9a0 EFLAGS: 00010202
RAX: 000000000000000d RBX: 0000000000000000 RCX: 000000000000006c
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002e8fae0 R08: ffffc90002e8fa57 R09: ffffc90002e8fa20
R10: dffffc0000000000 R11: fffff520005d1f4b R12: ffffc90002e8fa20
R13: dffffc0000000000 R14: 1ffff920005d1f40 R15: 0000000000000068
FS:  00007feb729c56c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feb729c4ff8 CR3: 000000007dc0e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182
 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216
 vfs_setxattr+0x167/0x2e0 fs/xattr.c:303
 do_setxattr fs/xattr.c:588 [inline]
 setxattr+0x36c/0x390 fs/xattr.c:611
 __do_sys_fsetxattr fs/xattr.c:667 [inline]
 __se_sys_fsetxattr+0x15e/0x1d0 fs/xattr.c:656
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7feb73384799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007feb729c5028 EFLAGS: 00000246 ORIG_RAX: 00000000000000be
RAX: ffffffffffffffda RBX: 00007feb735fe090 RCX: 00007feb73384799
RDX: 0000200000000400 RSI: 00002000000003c0 RDI: 0000000000000004
RBP: 00007feb7341abd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007feb735fe128 R14: 00007feb735fe090 R15: 00007ffdc454f1a8
 </TASK>
Modules linked in:
---[ end trace b0d552fa00f2ed81 ]---
RIP: 0010:d_really_is_negative include/linux/dcache.h:476 [inline]
RIP: 0010:reiserfs_xattr_jcreate_nblocks fs/reiserfs/xattr.h:79 [inline]
RIP: 0010:reiserfs_xattr_set+0x379/0x590 fs/reiserfs/xattr.c:631
Code: f8 48 c1 e8 03 42 80 3c 28 00 4c 8d a4 24 80 00 00 00 74 08 4c 89 ff e8 45 85 bb ff 4d 8b 3f 49 83 c7 68 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 28 85 bb ff 48 83 7c 24 38 00 b8
RSP: 0018:ffffc90002e8f9a0 EFLAGS: 00010202
RAX: 000000000000000d RBX: 0000000000000000 RCX: 000000000000006c
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002e8fae0 R08: ffffc90002e8fa57 R09: ffffc90002e8fa20
R10: dffffc0000000000 R11: fffff520005d1f4b R12: ffffc90002e8fa20
R13: dffffc0000000000 R14: 1ffff920005d1f40 R15: 0000000000000068
FS:  00007feb729c56c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feb729c4ff8 CR3: 000000007dc0e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	f8                   	clc
   1:	48 c1 e8 03          	shr    $0x3,%rax
   5:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
   a:	4c 8d a4 24 80 00 00 	lea    0x80(%rsp),%r12
  11:	00
  12:	74 08                	je     0x1c
  14:	4c 89 ff             	mov    %r15,%rdi
  17:	e8 45 85 bb ff       	call   0xffbb8561
  1c:	4d 8b 3f             	mov    (%r15),%r15
  1f:	49 83 c7 68          	add    $0x68,%r15
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ff             	mov    %r15,%rdi
  34:	e8 28 85 bb ff       	call   0xffbb8561
  39:	48 83 7c 24 38 00    	cmpq   $0x0,0x38(%rsp)
  3f:	b8                   	.byte 0xb8