smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 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:871!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 6155 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__filemap_add_folio+0x11ad/0x12f0 mm/filemap.c:870
Code: 24 c8 ff 4c 89 e7 48 c7 c6 a0 5e b4 8b e8 5b c5 2f ff 90 0f 0b e8 a3 24 c8 ff 4c 89 e7 48 c7 c6 80 55 b4 8b e8 44 c5 2f ff 90 <0f> 0b e8 8c 24 c8 ff 4c 89 e7 48 c7 c6 a0 5e b4 8b e8 2d c5 2f ff
RSP: 0018:ffffc9000378f2c0 EFLAGS: 00010246
RAX: 0046f27fc9368400 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffffffff8db9fb03 RDI: 00000000ffffffff
RBP: ffffc9000378f428 R08: ffffffff8fc35777 R09: 1ffffffff1f86aee
R10: dffffc0000000000 R11: fffffbfff1f86aef R12: ffffea000167f780
R13: dffffc0000000000 R14: ffffea000167f788 R15: 0000000000000002
FS:  00007f5cf8be56c0(0000) GS:ffff8881259fc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5cf8bc3f98 CR3: 000000007e4de000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 filemap_add_folio+0x26d/0x540 mm/filemap.c:978
 ra_alloc_folio mm/readahead.c:453 [inline]
 page_cache_ra_order+0x6bc/0xe70 mm/readahead.c:512
 filemap_get_pages+0x468/0x1de0 mm/filemap.c:2638
 filemap_splice_read+0x581/0xc60 mm/filemap.c:3027
 do_splice_read fs/splice.c:982 [inline]
 splice_direct_to_actor+0x4a9/0xcc0 fs/splice.c:1086
 do_splice_direct_actor fs/splice.c:1204 [inline]
 do_splice_direct+0x181/0x270 fs/splice.c:1230
 do_sendfile+0x4da/0x7e0 fs/read_write.c:1370
 __do_sys_sendfile64 fs/read_write.c:1431 [inline]
 __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
 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: 0033:0x7f5cf7d8eec9
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:00007f5cf8be5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f5cf7fe5fa0 RCX: 00007f5cf7d8eec9
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007f5cf7e11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5cf7fe6038 R14: 00007f5cf7fe5fa0 R15: 00007ffeaa5a2e28
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__filemap_add_folio+0x11ad/0x12f0 mm/filemap.c:870
Code: 24 c8 ff 4c 89 e7 48 c7 c6 a0 5e b4 8b e8 5b c5 2f ff 90 0f 0b e8 a3 24 c8 ff 4c 89 e7 48 c7 c6 80 55 b4 8b e8 44 c5 2f ff 90 <0f> 0b e8 8c 24 c8 ff 4c 89 e7 48 c7 c6 a0 5e b4 8b e8 2d c5 2f ff
RSP: 0018:ffffc9000378f2c0 EFLAGS: 00010246
RAX: 0046f27fc9368400 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffffffff8db9fb03 RDI: 00000000ffffffff
RBP: ffffc9000378f428 R08: ffffffff8fc35777 R09: 1ffffffff1f86aee
R10: dffffc0000000000 R11: fffffbfff1f86aef R12: ffffea000167f780
R13: dffffc0000000000 R14: ffffea000167f788 R15: 0000000000000002
FS:  00007f5cf8be56c0(0000) GS:ffff8881259fc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5cf8bc3f98 CR3: 000000007e4de000 CR4: 00000000003526f0