kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
------------[ cut here ]------------
kernel BUG at mm/filemap.c:858!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 12391 Comm: syz.1.1726 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__filemap_add_folio+0xfc2/0x12a0 mm/filemap.c:858
Code: 50 c1 ff 48 c7 c6 e0 92 dd 8b 4c 89 ef e8 c6 ea 12 00 90 0f 0b e8 fe 4f c1 ff 48 c7 c6 40 93 dd 8b 4c 89 ef e8 af ea 12 00 90 <0f> 0b e8 e7 4f c1 ff 48 c7 c6 c0 93 dd 8b 4c 89 ef e8 98 ea 12 00
RSP: 0018:ffffc90003b6f3f8 EFLAGS: 00010246
RAX: 0000000000080000 RBX: 0000000000112c00 RCX: ffffc9000e1ea000
RDX: 0000000000080000 RSI: ffffffff825b1b68 RDI: ffff888034a24f44
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: ffffea00021ff240 R14: 000000000001a570 R15: 0000000000000000
FS:  00007fcde161c6c0(0000) GS:ffff8881240e0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3653cb CR3: 000000002aceb000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 filemap_add_folio+0x1d3/0x630 mm/filemap.c:966
 ra_alloc_folio mm/readahead.c:470 [inline]
 page_cache_ra_order+0x602/0xed0 mm/readahead.c:535
 do_sync_mmap_readahead mm/filemap.c:3428 [inline]
 filemap_fault+0x1943/0x3130 mm/filemap.c:3582
 __do_fault+0x10b/0x440 mm/memory.c:5425
 do_read_fault mm/memory.c:5860 [inline]
 do_fault+0xa99/0x1750 mm/memory.c:5994
 do_pte_missing mm/memory.c:4566 [inline]
 handle_pte_fault mm/memory.c:6379 [inline]
 __handle_mm_fault+0x187d/0x2a00 mm/memory.c:6517
 handle_mm_fault+0x37b/0xa30 mm/memory.c:6686
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0x1178/0x32a0 mm/gup.c:1428
 populate_vma_page_range+0x267/0x3f0 mm/gup.c:1860
 __mm_populate+0x107/0x3a0 mm/gup.c:1963
 mm_populate include/linux/mm.h:4171 [inline]
 vm_mmap_pgoff+0x37f/0x470 mm/util.c:586
 ksys_mmap_pgoff+0x3cb/0x610 mm/mmap.c:606
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcde079ce59
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:00007fcde161c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fcde0a16090 RCX: 00007fcde079ce59
RDX: 0000000001000002 RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007fcde0832e6f R08: 0000000000000005 R09: 000000001a580000
R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcde0a16128 R14: 00007fcde0a16090 R15: 00007fff9b657928
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__filemap_add_folio+0xfc2/0x12a0 mm/filemap.c:858
Code: 50 c1 ff 48 c7 c6 e0 92 dd 8b 4c 89 ef e8 c6 ea 12 00 90 0f 0b e8 fe 4f c1 ff 48 c7 c6 40 93 dd 8b 4c 89 ef e8 af ea 12 00 90 <0f> 0b e8 e7 4f c1 ff 48 c7 c6 c0 93 dd 8b 4c 89 ef e8 98 ea 12 00
RSP: 0018:ffffc90003b6f3f8 EFLAGS: 00010246
RAX: 0000000000080000 RBX: 0000000000112c00 RCX: ffffc9000e1ea000
RDX: 0000000000080000 RSI: ffffffff825b1b68 RDI: ffff888034a24f44
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000