ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
------------[ cut here ]------------
kernel BUG at mm/filemap.c:871!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 5998 Comm: syz.0.1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__filemap_add_folio+0x11ad/0x12f0 mm/filemap.c:870
Code: 30 c9 ff 4c 89 e7 48 c7 c6 c0 75 b4 8b e8 5b 6b 30 ff 90 0f 0b e8 e3 30 c9 ff 4c 89 e7 48 c7 c6 a0 6c b4 8b e8 44 6b 30 ff 90 <0f> 0b e8 cc 30 c9 ff 4c 89 e7 48 c7 c6 c0 75 b4 8b e8 2d 6b 30 ff
RSP: 0018:ffffc9000aac7280 EFLAGS: 00010246
RAX: 4fe77f70e9b3f000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffffffff8dbbd436 RDI: 00000000ffffffff
RBP: ffffc9000aac7400 R08: ffffffff8fc3ee37 R09: 1ffffffff1f87dc6
R10: dffffc0000000000 R11: fffffbfff1f87dc7 R12: ffffea0001d9cd80
R13: dffffc0000000000 R14: ffffea0001d9cd88 R15: 0000000000000002
FS:  00007f2353df66c0(0000) GS:ffff8881259f9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000bd038 CR3: 000000002a0e4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 filemap_add_folio+0x26d/0x540 mm/filemap.c:978
 ra_alloc_folio mm/readahead.c:448 [inline]
 page_cache_ra_order+0x643/0xd40 mm/readahead.c:506
 do_sync_mmap_readahead+0x25e/0x7a0 mm/filemap.c:-1
 filemap_fault+0x6b9/0x12b0 mm/filemap.c:3471
 __do_fault+0x135/0x390 mm/memory.c:5280
 do_read_fault mm/memory.c:5703 [inline]
 do_fault mm/memory.c:5837 [inline]
 do_pte_missing mm/memory.c:4362 [inline]
 handle_pte_fault mm/memory.c:6182 [inline]
 __handle_mm_fault+0x35e3/0x5400 mm/memory.c:6323
 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6492
 faultin_page mm/gup.c:1136 [inline]
 __get_user_pages+0x1699/0x2ce0 mm/gup.c:1438
 populate_vma_page_range+0x29f/0x3a0 mm/gup.c:1872
 __mm_populate+0x24c/0x380 mm/gup.c:1975
 mm_populate include/linux/mm.h:3455 [inline]
 vm_mmap_pgoff+0x387/0x4d0 mm/util.c:585
 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:604
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2355b8ebe9
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:00007f2353df6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f2355dc6090 RCX: 00007f2355b8ebe9
RDX: 0000000001000002 RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f2355c11e19 R08: 0000000000000008 R09: 000000002c93a000
R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2355dc6128 R14: 00007f2355dc6090 R15: 00007ffcdc7ef8c8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__filemap_add_folio+0x11ad/0x12f0 mm/filemap.c:870
Code: 30 c9 ff 4c 89 e7 48 c7 c6 c0 75 b4 8b e8 5b 6b 30 ff 90 0f 0b e8 e3 30 c9 ff 4c 89 e7 48 c7 c6 a0 6c b4 8b e8 44 6b 30 ff 90 <0f> 0b e8 cc 30 c9 ff 4c 89 e7 48 c7 c6 c0 75 b4 8b e8 2d 6b 30 ff
RSP: 0018:ffffc9000aac7280 EFLAGS: 00010246
RAX: 4fe77f70e9b3f000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffffffff8dbbd436 RDI: 00000000ffffffff
RBP: ffffc9000aac7400 R08: ffffffff8fc3ee37 R09: 1ffffffff1f87dc6
R10: dffffc0000000000 R11: fffffbfff1f87dc7 R12: ffffea0001d9cd80
R13: dffffc0000000000 R14: ffffea0001d9cd88 R15: 0000000000000002
FS:  00007f2353df66c0(0000) GS:ffff888125af9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000002e4030 CR3: 000000002a0e4000 CR4: 00000000003526f0