kthread+0x726/0x8b0 kernel/kthread.c:463
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
------------[ cut here ]------------
kernel BUG at mm/filemap.c:859!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 8891 Comm: syz.5.1076 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:__filemap_add_folio+0x11bc/0x1300 mm/filemap.c:858
Code: 85 c6 ff 4c 89 e7 48 c7 c6 e0 98 b7 8b e8 7c 1b 2a ff 90 0f 0b e8 c4 85 c6 ff 4c 89 e7 48 c7 c6 80 8d b7 8b e8 65 1b 2a ff 90 <0f> 0b e8 ad 85 c6 ff 4c 89 e7 48 c7 c6 e0 98 b7 8b e8 4e 1b 2a ff
RSP: 0018:ffffc900030d71e0 EFLAGS: 00010246
RAX: 4f514bb7e979db00 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffffffff8dcc9d7a RDI: 00000000ffffffff
RBP: ffffc900030d7360 R08: ffffffff8fef2077 R09: 1ffffffff1fde40e
R10: dffffc0000000000 R11: fffffbfff1fde40f R12: ffffea00014d6440
R13: dffffc0000000000 R14: ffffea00014d6448 R15: 0000000000000004
FS:  00007fbfa90d56c0(0000) GS:ffff8881257f3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055af29e9eee0 CR3: 000000003133a000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 filemap_add_folio+0x264/0x530 mm/filemap.c:966
 ra_alloc_folio mm/readahead.c:453 [inline]
 page_cache_ra_order+0x6a8/0xe50 mm/readahead.c:512
 do_sync_mmap_readahead+0x6ad/0x8e0 mm/filemap.c:3400
 filemap_fault+0x703/0x12e0 mm/filemap.c:3549
 __do_fault+0x138/0x390 mm/memory.c:5323
 do_read_fault mm/memory.c:5758 [inline]
 do_fault mm/memory.c:5892 [inline]
 do_pte_missing+0x21a2/0x37a0 mm/memory.c:4404
 handle_pte_fault mm/memory.c:6276 [inline]
 __handle_mm_fault mm/memory.c:6414 [inline]
 handle_mm_fault+0x1b8c/0x32a0 mm/memory.c:6583
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0x165b/0x29d0 mm/gup.c:1428
 populate_vma_page_range+0x2be/0x3c0 mm/gup.c:1860
 __mm_populate+0x25f/0x390 mm/gup.c:1963
 mm_populate include/linux/mm.h:3705 [inline]
 vm_mmap_pgoff+0x3aa/0x4f0 mm/util.c:586
 ksys_mmap_pgoff+0x51e/0x760 mm/mmap.c:604
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbfa819aeb9
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:00007fbfa90d5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fbfa8416090 RCX: 00007fbfa819aeb9
RDX: 0000000001000002 RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007fbfa8208c1f R08: 0000000000000003 R09: 00000000783f7000
R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbfa8416128 R14: 00007fbfa8416090 R15: 00007ffe405631b8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__filemap_add_folio+0x11bc/0x1300 mm/filemap.c:858
Code: 85 c6 ff 4c 89 e7 48 c7 c6 e0 98 b7 8b e8 7c 1b 2a ff 90 0f 0b e8 c4 85 c6 ff 4c 89 e7 48 c7 c6 80 8d b7 8b e8 65 1b 2a ff 90 <0f> 0b e8 ad 85 c6 ff 4c 89 e7 48 c7 c6 e0 98 b7 8b e8 4e 1b 2a ff
RSP: 0018:ffffc900030d71e0 EFLAGS: 00010246
RAX: 4f514bb7e979db00 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffffffff8dcc9d7a RDI: 00000000ffffffff
RBP: ffffc900030d7360 R08: ffffffff8fef2077 R09: 1ffffffff1fde40e
R10: dffffc0000000000 R11: fffffbfff1fde40f R12: ffffea00014d6440
R13: dffffc0000000000 R14: ffffea00014d6448 R15: 0000000000000004
FS:  00007fbfa90d56c0(0000) GS:ffff8881256f3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe320be7e9c CR3: 000000003133a000 CR4: 0000000000350ef0