create_dummy_stack mm/page_owner.c:103 [inline] register_dummy_stack+0x98/0x100 mm/page_owner.c:109 init_page_owner+0x2e/0x600 mm/page_owner.c:127 invoke_init_callbacks mm/page_ext.c:152 [inline] page_ext_init+0x500/0x540 mm/page_ext.c:490 mm_core_init+0x97/0xb0 mm/mm_init.c:2763 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:859! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 7218 Comm: syz.0.438 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__filemap_add_folio+0x1204/0x13a0 mm/filemap.c:858 Code: 3f c5 ff 4c 89 e7 48 c7 c6 00 ad d7 8b e8 44 a1 27 ff 90 0f 0b e8 1c 3f c5 ff 4c 89 e7 48 c7 c6 a0 a1 d7 8b e8 2d a1 27 ff 90 <0f> 0b e8 05 3f c5 ff 4c 89 e7 48 c7 c6 00 ad d7 8b e8 16 a1 27 ff RSP: 0018:ffffc90003857140 EFLAGS: 00010246 RAX: 3498dbca41d28d00 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000007 RSI: ffffffff8df013c5 RDI: 00000000ffffffff RBP: ffffc900038572c0 R08: ffffffff90121fb7 R09: 1ffffffff20243f6 R10: dffffc0000000000 R11: fffffbfff20243f7 R12: ffffea0001e1c700 R13: dffffc0000000000 R14: ffff888023969f90 R15: 0000000000000004 FS: 00007f9c8b5d56c0(0000) GS:ffff888125448000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc9e0617dac CR3: 000000007a9e6000 CR4: 00000000003526f0 Call Trace: filemap_add_folio+0x264/0x530 mm/filemap.c:966 ra_alloc_folio mm/readahead.c:456 [inline] page_cache_ra_order+0x6b5/0xeb0 mm/readahead.c:515 do_sync_mmap_readahead+0x6ad/0x8e0 mm/filemap.c:3405 filemap_fault+0x6e2/0x1320 mm/filemap.c:3554 __do_fault+0x138/0x390 mm/memory.c:5345 do_shared_fault mm/memory.c:5844 [inline] do_fault mm/memory.c:5918 [inline] do_pte_missing+0x5e1/0x34c0 mm/memory.c:4458 handle_pte_fault mm/memory.c:6298 [inline] __handle_mm_fault mm/memory.c:6436 [inline] handle_mm_fault+0x1bec/0x3310 mm/memory.c:6605 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x165b/0x29d0 mm/gup.c:1428 __get_user_pages_locked mm/gup.c:1692 [inline] faultin_page_range+0x240/0x8c0 mm/gup.c:1912 madvise_populate mm/madvise.c:974 [inline] madvise_do_behavior+0x2e5/0x540 mm/madvise.c:1933 do_madvise+0x1fa/0x2e0 mm/madvise.c:2028 __do_sys_madvise mm/madvise.c:2037 [inline] __se_sys_madvise mm/madvise.c:2035 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2035 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9c8d39c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9c8b5d5028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f9c8d616180 RCX: 00007f9c8d39c799 RDX: 0000000000000017 RSI: 0000000000800000 RDI: 00002000000ec000 RBP: 00007f9c8d432bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9c8d616218 R14: 00007f9c8d616180 R15: 00007fff0b7198e8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__filemap_add_folio+0x1204/0x13a0 mm/filemap.c:858 Code: 3f c5 ff 4c 89 e7 48 c7 c6 00 ad d7 8b e8 44 a1 27 ff 90 0f 0b e8 1c 3f c5 ff 4c 89 e7 48 c7 c6 a0 a1 d7 8b e8 2d a1 27 ff 90 <0f> 0b e8 05 3f c5 ff 4c 89 e7 48 c7 c6 00 ad d7 8b e8 16 a1 27 ff RSP: 0018:ffffc90003857140 EFLAGS: 00010246 RAX: 3498dbca41d28d00 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000007 RSI: ffffffff8df013c5 RDI: 00000000ffffffff RBP: ffffc900038572c0 R08: ffffffff90121fb7 R09: 1ffffffff20243f6 R10: dffffc0000000000 R11: fffffbfff20243f7 R12: ffffea0001e1c700 R13: dffffc0000000000 R14: ffff888023969f90 R15: 0000000000000004 FS: 00007f9c8b5d56c0(0000) GS:ffff888125448000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc9e0617dac CR3: 000000007a9e6000 CR4: 00000000003526f0