Oops: general protection fault, probably for non-canonical address 0xdffffc0000000084: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000420-0x0000000000000427]
CPU: 1 UID: 0 PID: 37 Comm: khugepaged Not tainted 6.11.0-rc1-syzkaller-00154-gc0ecd6388360 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:khugepaged_scan_mm_slot mm/khugepaged.c:2382 [inline]
RIP: 0010:khugepaged_do_scan mm/khugepaged.c:2514 [inline]
RIP: 0010:khugepaged+0xad9/0x1600 mm/khugepaged.c:2570
Code: 00 00 41 bc 01 00 00 00 45 31 ff e9 9a fd ff ff e8 ec be 9c ff 49 8d 7f 20 48 b9 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <80> 3c 08 00 0f 85 a3 09 00 00 49 8d 7f 70 49 8b 6f 20 48 b9 00 00
RSP: 0018:ffffc90000ad7ce8 EFLAGS: 00010207
RAX: 0000000000000084 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: ffff888019ee1e00 RSI: ffffffff81edbc44 RDI: 0000000000000426
RBP: 0000000008100077 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000003
R13: 0000000000000000 R14: 1ffff9200015afaf R15: 0000000000000406
FS:  0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff8e14f6968 CR3: 000000007c162000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:khugepaged_scan_mm_slot mm/khugepaged.c:2382 [inline]
RIP: 0010:khugepaged_do_scan mm/khugepaged.c:2514 [inline]
RIP: 0010:khugepaged+0xad9/0x1600 mm/khugepaged.c:2570
Code: 00 00 41 bc 01 00 00 00 45 31 ff e9 9a fd ff ff e8 ec be 9c ff 49 8d 7f 20 48 b9 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <80> 3c 08 00 0f 85 a3 09 00 00 49 8d 7f 70 49 8b 6f 20 48 b9 00 00
RSP: 0018:ffffc90000ad7ce8 EFLAGS: 00010207
RAX: 0000000000000084 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: ffff888019ee1e00 RSI: ffffffff81edbc44 RDI: 0000000000000426
RBP: 0000000008100077 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000003
R13: 0000000000000000 R14: 1ffff9200015afaf R15: 0000000000000406
FS:  0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056322350ffd0 CR3: 000000002b1ea000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	41 bc 01 00 00 00    	mov    $0x1,%r12d
   8:	45 31 ff             	xor    %r15d,%r15d
   b:	e9 9a fd ff ff       	jmp    0xfffffdaa
  10:	e8 ec be 9c ff       	call   0xff9cbf01
  15:	49 8d 7f 20          	lea    0x20(%r15),%rdi
  19:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  20:	fc ff df
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	0f 85 a3 09 00 00    	jne    0x9d7
  34:	49 8d 7f 70          	lea    0x70(%r15),%rdi
  38:	49 8b 6f 20          	mov    0x20(%r15),%rbp
  3c:	48                   	rex.W
  3d:	b9                   	.byte 0xb9