 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
------------[ cut here ]------------
kernel BUG at mm/filemap.c:860!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 16835 Comm: syz.8.4106 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__filemap_add_folio+0x11bc/0x1330
Code: 30 c3 ff 4c 89 e7 48 c7 c6 20 b6 d7 8b e8 3c 92 25 ff 90 0f 0b e8 44 30 c3 ff 4c 89 e7 48 c7 c6 80 aa d7 8b e8 25 92 25 ff 90 <0f> 0b e8 2d 30 c3 ff 4c 89 e7 48 c7 c6 20 b6 d7 8b e8 0e 92 25 ff
RSP: 0018:ffffc9000929f1e0 EFLAGS: 00010246
RAX: 81d6980d1bcd8400 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffffffff8dfd5769 RDI: 00000000ffffffff
RBP: ffffc9000929f360 R08: ffffffff903366f7 R09: 1ffffffff2066cde
R10: dffffc0000000000 R11: fffffbfff2066cdf R12: ffffea00059ce5c0
R13: dffffc0000000000 R14: ffffea00059ce5c8 R15: 0000000000000004
FS:  00007f91c9fd56c0(0000) GS:ffff8882a921b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f914714da08 CR3: 0000000116c92000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 filemap_add_folio+0x264/0x530
 page_cache_ra_order+0x6a9/0xe80
 do_sync_mmap_readahead+0x6ad/0x8e0
 filemap_fault+0x703/0x1300
 __do_fault+0x138/0x2a0
 do_pte_missing+0x2093/0x33f0
 handle_mm_fault+0x1bd7/0x3170
 __get_user_pages+0x1683/0x2720
 populate_vma_page_range+0x2be/0x3c0
 __mm_populate+0x25f/0x390
 vm_mmap_pgoff+0x3aa/0x4f0
 ksys_mmap_pgoff+0x51e/0x760
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f91cbd9c819
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:00007f91c9fd5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f91cc016090 RCX: 00007f91cbd9c819
RDX: 0000000001000005 RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f91cbe32c91 R08: 0000000000000004 R09: 000000000c3af000
R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f91cc016128 R14: 00007f91cc016090 R15: 00007ffe2f07c238
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__filemap_add_folio+0x11bc/0x1330
Code: 30 c3 ff 4c 89 e7 48 c7 c6 20 b6 d7 8b e8 3c 92 25 ff 90 0f 0b e8 44 30 c3 ff 4c 89 e7 48 c7 c6 80 aa d7 8b e8 25 92 25 ff 90 <0f> 0b e8 2d 30 c3 ff 4c 89 e7 48 c7 c6 20 b6 d7 8b e8 0e 92 25 ff
RSP: 0018:ffffc9000929f1e0 EFLAGS: 00010246
RAX: 81d6980d1bcd8400 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffffffff8dfd5769 RDI: 00000000ffffffff
RBP: ffffc9000929f360 R08: ffffffff903366f7 R09: 1ffffffff2066cde
R10: dffffc0000000000 R11: fffffbfff2066cdf R12: ffffea00059ce5c0
R13: dffffc0000000000 R14: ffffea00059ce5c8 R15: 0000000000000004
FS:  00007f91c9fd56c0(0000) GS:ffff8882a921b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f91465e7158 CR3: 0000000116c92000 CR4: 00000000000006f0
