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kernel BUG at mm/khugepaged.c:1785!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8716 Comm: syz.8.1430 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:collapse_file mm/khugepaged.c:1785 [inline]
RIP: 0010:hpage_collapse_scan_file+0x53c0/0x6320 mm/khugepaged.c:2248
Code: 48 89 c7 48 c7 c6 20 4c 98 8a e8 cb fa e4 ff 0f 0b e8 c4 6e aa ff 49 bc 00 00 00 00 00 fc ff df e9 9f fb ff ff e8 b0 6e aa ff <0f> 0b e8 a9 6e aa ff 0f 0b e8 a2 6e aa ff 0f 0b e8 9b 6e aa ff e9
RSP: 0018:ffffc900033e7660 EFLAGS: 00010287
RAX: ffffffff81d65830 RBX: ffffc900033e77e0 RCX: 0000000000080000
RDX: ffffc9000e9ab000 RSI: 0000000000002269 RDI: 000000000000226a
RBP: ffffc900033e7908 R08: dffffc0000000000 R09: ffffc900033e7800
R10: fffff5200067cf03 R11: 1ffff9200067cf00 R12: dffffc0000000000
R13: ffff88802075bc00 R14: 0000000000000001 R15: 00000000000ffffc
FS:  00007f4e155476c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc88358d000 CR3: 0000000066f7f000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 madvise_collapse+0x69c/0xc50 mm/khugepaged.c:2703
 madvise_vma_behavior mm/madvise.c:1085 [inline]
 madvise_walk_vmas mm/madvise.c:1259 [inline]
 do_madvise+0x6a4/0x33d0 mm/madvise.c:1438
 __do_sys_madvise mm/madvise.c:1451 [inline]
 __se_sys_madvise mm/madvise.c:1449 [inline]
 __x64_sys_madvise+0xa2/0xb0 mm/madvise.c:1449
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4e1478eb69
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:00007f4e15547038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f4e149b5fa0 RCX: 00007f4e1478eb69
RDX: 0000000000000019 RSI: 0000000000400000 RDI: 0000200000000000
RBP: 00007f4e14811df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4e149b5fa0 R15: 00007fff60ebbd18
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:collapse_file mm/khugepaged.c:1785 [inline]
RIP: 0010:hpage_collapse_scan_file+0x53c0/0x6320 mm/khugepaged.c:2248
Code: 48 89 c7 48 c7 c6 20 4c 98 8a e8 cb fa e4 ff 0f 0b e8 c4 6e aa ff 49 bc 00 00 00 00 00 fc ff df e9 9f fb ff ff e8 b0 6e aa ff <0f> 0b e8 a9 6e aa ff 0f 0b e8 a2 6e aa ff 0f 0b e8 9b 6e aa ff e9
RSP: 0018:ffffc900033e7660 EFLAGS: 00010287
RAX: ffffffff81d65830 RBX: ffffc900033e77e0 RCX: 0000000000080000
RDX: ffffc9000e9ab000 RSI: 0000000000002269 RDI: 000000000000226a
RBP: ffffc900033e7908 R08: dffffc0000000000 R09: ffffc900033e7800
R10: fffff5200067cf03 R11: 1ffff9200067cf00 R12: dffffc0000000000
R13: ffff88802075bc00 R14: 0000000000000001 R15: 00000000000ffffc
FS:  00007f4e155476c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005566cf85d950 CR3: 0000000066f7f000 CR4: 00000000003506f0