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 6.12.0-rc5-syzkaller-00005-ge42b1a9a2557 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:khugepaged_scan_mm_slot mm/khugepaged.c:2383 [inline]
RIP: 0010:khugepaged_do_scan mm/khugepaged.c:2515 [inline]
RIP: 0010:khugepaged+0x771/0x1dc0 mm/khugepaged.c:2571
Code: 8b 1b be 00 00 00 01 48 21 de 31 ff e8 c8 ea 92 ff b8 00 00 00 01 48 21 c3 0f 85 4a 0d 00 00 49 8d 7d 20 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 05 e8 d3 7e f9 ff 4d 8b 75 20 49 8d 5d 70 48 89
RSP: 0018:ffffc90000ad7bc0 EFLAGS: 00010207
RAX: 0000000000000084 RBX: 0000000000000000 RCX: ffff88801fefda00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000426
RBP: ffffc90000ad7ed0 R08: ffffffff8201f248 R09: 1ffff1100358ea2e
R10: dffffc0000000000 R11: ffffed100358ea2f R12: ffff88801ac74a00
R13: 0000000000000406 R14: 00000000180400fb R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb17451ed58 CR3: 0000000064988000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/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:2383 [inline]
RIP: 0010:khugepaged_do_scan mm/khugepaged.c:2515 [inline]
RIP: 0010:khugepaged+0x771/0x1dc0 mm/khugepaged.c:2571
Code: 8b 1b be 00 00 00 01 48 21 de 31 ff e8 c8 ea 92 ff b8 00 00 00 01 48 21 c3 0f 85 4a 0d 00 00 49 8d 7d 20 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 05 e8 d3 7e f9 ff 4d 8b 75 20 49 8d 5d 70 48 89
RSP: 0018:ffffc90000ad7bc0 EFLAGS: 00010207
RAX: 0000000000000084 RBX: 0000000000000000 RCX: ffff88801fefda00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000426
RBP: ffffc90000ad7ed0 R08: ffffffff8201f248 R09: 1ffff1100358ea2e
R10: dffffc0000000000 R11: ffffed100358ea2f R12: ffff88801ac74a00
R13: 0000000000000406 R14: 00000000180400fb R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555594c407d0 CR3: 0000000064988000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 8b 1b mov (%rbx),%ebx
2: be 00 00 00 01 mov $0x1000000,%esi
7: 48 21 de and %rbx,%rsi
a: 31 ff xor %edi,%edi
c: e8 c8 ea 92 ff call 0xff92ead9
11: b8 00 00 00 01 mov $0x1000000,%eax
16: 48 21 c3 and %rax,%rbx
19: 0f 85 4a 0d 00 00 jne 0xd69
1f: 49 8d 7d 20 lea 0x20(%r13),%rdi
23: 48 89 f8 mov %rdi,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction
2f: 74 05 je 0x36
31: e8 d3 7e f9 ff call 0xfff97f09
36: 4d 8b 75 20 mov 0x20(%r13),%r14
3a: 49 8d 5d 70 lea 0x70(%r13),%rbx
3e: 48 rex.W
3f: 89 .byte 0x89