Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue: kernel BUG in __filemap_add_folio
reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0x79c/0x15f0 kernel/rcu/tree.c:2857 handle_softirqs+0x219/0x950 kernel/softirq.c:622 run_ksoftirqd kernel/softirq.c:1063 [inline] run_ksoftirqd+0x3a/0x60 kernel/softirq.c:1055 smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:160 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x983/0xb10 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:858! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 1 UID: 0 PID: 6821 Comm: syz.1.76 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__filemap_add_folio+0xf29/0x11b0 mm/filemap.c:858 Code: 9b c6 ff 48 c7 c6 c0 e9 99 8b 4c 89 ef e8 0f 74 11 00 90 0f 0b e8 47 9b c6 ff 48 c7 c6 20 ea 99 8b 4c 89 ef e8 f8 73 11 00 90 <0f> 0b e8 30 9b c6 ff 90 0f 0b 90 e9 1c fc ff ff e8 22 9b c6 ff 48 RSP: 0018:ffffc900033af840 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff8880737fc980 RSI: ffffffff81f7ebf8 RDI: ffff8880737fce04 RBP: 0000000000112cc0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff908689d7 R11: 0000000000000000 R12: 0000000000000002 R13: ffffea0001ce4980 R14: 0000000000000000 R15: 0000000000000000 FS: 000055557770b500(0000) GS:ffff888124a48000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9aef15c000 CR3: 000000002ee4c000 CR4: 00000000003526f0 Call Trace: <TASK> filemap_add_folio+0x19a/0x610 mm/filemap.c:966 ra_alloc_folio mm/readahead.c:453 [inline] page_cache_ra_order+0x637/0xed0 mm/readahead.c:512 do_sync_mmap_readahead mm/filemap.c:3400 [inline] filemap_fault+0x16ac/0x29d0 mm/filemap.c:3549 __do_fault+0x10d/0x490 mm/memory.c:5320 do_shared_fault mm/memory.c:5819 [inline] do_fault+0x302/0x1ad0 mm/memory.c:5893 do_pte_missing mm/memory.c:4401 [inline] handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault+0x1919/0x2bb0 mm/memory.c:6411 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6580 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x64/0xc0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f8af1a55171 Code: 48 8b 54 24 08 48 85 d2 74 17 8b 44 24 18 0f c8 89 c0 48 89 44 24 18 48 83 fa 01 0f 85 b3 01 00 00 48 8b 44 24 10 8b 54 24 18 <89> 10 e9 15 fd ff ff 48 8b 44 24 10 8b 10 48 8b 44 24 08 48 85 c0 RSP: 002b:00007ffc7d678bf0 EFLAGS: 00010246 RAX: 0000200000000980 RBX: 0000000000000004 RCX: 0000000000000000 RDX: 0000000000004000 RSI: 0000000000000000 RDI: 000055557770b3c8 RBP: 00007ffc7d678cf8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000002 R12: 00007f8af1dd5fac R13: 00007f8af1dd5fa0 R14: fffffffffffffffe R15: 00007ffc7d678d40 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__filemap_add_folio+0xf29/0x11b0 mm/filemap.c:858 Code: 9b c6 ff 48 c7 c6 c0 e9 99 8b 4c 89 ef e8 0f 74 11 00 90 0f 0b e8 47 9b c6 ff 48 c7 c6 20 ea 99 8b 4c 89 ef e8 f8 73 11 00 90 <0f> 0b e8 30 9b c6 ff 90 0f 0b 90 e9 1c fc ff ff e8 22 9b c6 ff 48 RSP: 0018:ffffc900033af840 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff8880737fc980 RSI: ffffffff81f7ebf8 RDI: ffff8880737fce04 RBP: 0000000000112cc0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff908689d7 R11: 0000000000000000 R12: 0000000000000002 R13: ffffea0001ce4980 R14: 0000000000000000 R15: 0000000000000000 FS: 000055557770b500(0000) GS:ffff888124a48000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f772b5d7dac CR3: 000000002ee4c000 CR4: 00000000003526f0
Tested on:
commit: 40fbbd64 Merge tag 'pull-fixes' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10715dc2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=495547a782e37c4f dashboard link: https://syzkaller.appspot.com/bug?extid=4d3cc33ef7a77041efa6 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
Note: no patches were applied.