BUG: unable to handle page fault for address: fffffffffffffff1 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 72ac067 P4D 72ac067 PUD 72ae067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 UID: 0 PID: 481 Comm: syz.2.16 Not tainted 6.12.38-syzkaller-08883-g3f3a5c5e782d #0 0ee28379f0de14f9c9770fc5cf26ed2d739820d2 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:read_pages+0x47e/0x670 mm/readahead.c:190 Code: 48 b8 00 00 00 00 00 fc ff df 41 80 7c 05 00 00 74 08 4c 89 e7 e8 02 c7 1c 00 49 8b 3c 24 48 89 de 4d 89 f3 41 ba d8 94 93 a2 <45> 03 53 f1 74 02 0f 0b 2e e8 e0 0b 41 1e 4c 89 e7 e8 2c 36 00 00 RSP: 0018:ffffc90000f1f140 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffffea0004bb8380 RCX: 1ffffffff0c2c5f9 RDX: 0000000000000000 RSI: ffffea0004bb8380 RDI: ffff88811c5793c0 RBP: ffffc90000f1f270 R08: ffffea0004bb83b7 R09: 1ffffd4000977076 R10: 00000000a29394d8 R11: 0000000000000000 R12: ffffc90000f1f5d0 R13: 1ffff920001e3eba R14: 0000000000000000 R15: ffffffff86162fc8 FS: 00007f74560436c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffff1 CR3: 000000011bd8e000 CR4: 00000000003526b0 Call Trace: page_cache_ra_order+0x8cd/0xdf0 mm/readahead.c:524 page_cache_sync_ra+0x713/0x920 mm/readahead.c:627 page_cache_sync_readahead include/linux/pagemap.h:1403 [inline] collapse_file mm/khugepaged.c:1902 [inline] hpage_collapse_scan_file+0xbab/0x3510 mm/khugepaged.c:2329 madvise_collapse+0x4c6/0xaf0 mm/khugepaged.c:2771 madvise_vma_behavior+0x69d/0x2d40 mm/madvise.c:1365 madvise_walk_vmas+0x1b1/0x2e0 mm/madvise.c:1545 do_madvise+0x4b7/0x960 mm/madvise.c:1738 __do_sys_madvise mm/madvise.c:1754 [inline] __se_sys_madvise mm/madvise.c:1752 [inline] __x64_sys_madvise+0xae/0xc0 mm/madvise.c:1752 x64_sys_call+0x20c3/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:29 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f745518e9a9 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:00007f7456043038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f74553b5fa0 RCX: 00007f745518e9a9 RDX: 0000000000000019 RSI: 0000000000c00000 RDI: 0000200000000000 RBP: 00007f7455210d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f74553b5fa0 R15: 00007ffdf4972d98 Modules linked in: CR2: fffffffffffffff1 ---[ end trace 0000000000000000 ]--- RIP: 0010:read_pages+0x47e/0x670 mm/readahead.c:190 Code: 48 b8 00 00 00 00 00 fc ff df 41 80 7c 05 00 00 74 08 4c 89 e7 e8 02 c7 1c 00 49 8b 3c 24 48 89 de 4d 89 f3 41 ba d8 94 93 a2 <45> 03 53 f1 74 02 0f 0b 2e e8 e0 0b 41 1e 4c 89 e7 e8 2c 36 00 00 RSP: 0018:ffffc90000f1f140 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffffea0004bb8380 RCX: 1ffffffff0c2c5f9 RDX: 0000000000000000 RSI: ffffea0004bb8380 RDI: ffff88811c5793c0 RBP: ffffc90000f1f270 R08: ffffea0004bb83b7 R09: 1ffffd4000977076 R10: 00000000a29394d8 R11: 0000000000000000 R12: ffffc90000f1f5d0 R13: 1ffff920001e3eba R14: 0000000000000000 R15: ffffffff86162fc8 FS: 00007f74560436c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffff1 CR3: 000000011bd8e000 CR4: 00000000003526b0 ---------------- Code disassembly (best guess): 0: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 7: fc ff df a: 41 80 7c 05 00 00 cmpb $0x0,0x0(%r13,%rax,1) 10: 74 08 je 0x1a 12: 4c 89 e7 mov %r12,%rdi 15: e8 02 c7 1c 00 call 0x1cc71c 1a: 49 8b 3c 24 mov (%r12),%rdi 1e: 48 89 de mov %rbx,%rsi 21: 4d 89 f3 mov %r14,%r11 24: 41 ba d8 94 93 a2 mov $0xa29394d8,%r10d * 2a: 45 03 53 f1 add -0xf(%r11),%r10d <-- trapping instruction 2e: 74 02 je 0x32 30: 0f 0b ud2 32: 2e e8 e0 0b 41 1e cs call 0x1e410c18 38: 4c 89 e7 mov %r12,%rdi 3b: e8 2c 36 00 00 call 0x366c