general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 6142 Comm: syz.6.314 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:dtInsertEntry+0xa89/0x1270 fs/jfs/jfs_dtree.c:4041
Code: 0f b6 5d 00 89 de 83 e6 02 31 ff e8 31 03 ad fe 83 e3 02 75 27 e8 c7 00 ad fe 48 8b 5c 24 70 48 83 c3 08 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 f3 06 00 00 c6 03 ff eb 49 e8 a0 00 ad
RSP: 0018:ffffc9000385f4d8 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: 0000000000080000
RDX: ffffc90017807000 RSI: 00000000000030bd RDI: 00000000000030be
RBP: 0000000000000080 R08: dffffc0000000000 R09: ffffed100bfbd824
R10: ffffed100bfbd824 R11: 1ffff1100bfbd823 R12: dffffc0000000000
R13: ffff88805fdec3c0 R14: 0000000000000001 R15: ffff88805fdec3b0
FS:  00007feffa7486c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000040 CR3: 000000007c61d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dtSplitPage+0x24f7/0x31d0 fs/jfs/jfs_dtree.c:1596
 dtSplitUp fs/jfs/jfs_dtree.c:1092 [inline]
 dtInsert+0xfb2/0x57a0 fs/jfs/jfs_dtree.c:871
 jfs_mkdir+0x6e5/0xa70 fs/jfs/namei.c:270
 vfs_mkdir+0x387/0x570 fs/namei.c:4073
 do_mkdirat+0x1d7/0x5a0 fs/namei.c:4098
 __do_sys_mkdirat fs/namei.c:4113 [inline]
 __se_sys_mkdirat fs/namei.c:4111 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4111
 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: 0033:0x7feffc4e1749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007feffa748038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007feffc737fa0 RCX: 00007feffc4e1749
RDX: 00000000000001c0 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007feffc565f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007feffc738038 R14: 00007feffc737fa0 R15: 00007fffd970f7e8
 </TASK>
Modules linked in:
---[ end trace 26e68f838d589815 ]---
RIP: 0010:dtInsertEntry+0xa89/0x1270 fs/jfs/jfs_dtree.c:4041
Code: 0f b6 5d 00 89 de 83 e6 02 31 ff e8 31 03 ad fe 83 e3 02 75 27 e8 c7 00 ad fe 48 8b 5c 24 70 48 83 c3 08 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 f3 06 00 00 c6 03 ff eb 49 e8 a0 00 ad
RSP: 0018:ffffc9000385f4d8 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: 0000000000080000
RDX: ffffc90017807000 RSI: 00000000000030bd RDI: 00000000000030be
RBP: 0000000000000080 R08: dffffc0000000000 R09: ffffed100bfbd824
R10: ffffed100bfbd824 R11: 1ffff1100bfbd823 R12: dffffc0000000000
R13: ffff88805fdec3c0 R14: 0000000000000001 R15: ffff88805fdec3b0
FS:  00007feffa7486c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555882d608 CR3: 000000007c61d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	0f b6 5d 00          	movzbl 0x0(%rbp),%ebx
   4:	89 de                	mov    %ebx,%esi
   6:	83 e6 02             	and    $0x2,%esi
   9:	31 ff                	xor    %edi,%edi
   b:	e8 31 03 ad fe       	call   0xfead0341
  10:	83 e3 02             	and    $0x2,%ebx
  13:	75 27                	jne    0x3c
  15:	e8 c7 00 ad fe       	call   0xfead00e1
  1a:	48 8b 5c 24 70       	mov    0x70(%rsp),%rbx
  1f:	48 83 c3 08          	add    $0x8,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 f3 06 00 00    	jne    0x72a
  37:	c6 03 ff             	movb   $0xff,(%rbx)
  3a:	eb 49                	jmp    0x85
  3c:	e8                   	.byte 0xe8
  3d:	a0                   	.byte 0xa0
  3e:	00                   	.byte 0x0
  3f:	ad                   	lods   %ds:(%rsi),%eax