[moderation/CI] Re: mm: clear pmd in pmdp_invalidate()

[syzbot ci <syzbot+ci0915606b3d8f5335@syzkaller.appspotmail.com>]

syzbot ci has tested the following series

[v1] mm: clear pmd in pmdp_invalidate()
https://lore.kernel.org/all/20261027113813.1332096-1-trintaeoitogc@gmail.com
* [PATCH] mm: clear pmd in pmdp_invalidate()

and found the following issue:
kernel BUG in page_table_check_clear

Full report is available here:
https://ci.syzbot.org/series/ea6c690b-0dbf-4e3e-8367-2b5092d2878d

***

kernel BUG in page_table_check_clear

tree:      mm-new
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
base:      01146870c415f6ff70a469fb7ceb962a3f2c8c52
arch:      amd64
compiler:  Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
config:    https://ci.syzbot.org/builds/b4be77d2-e026-48a2-b906-ba8967ba2d37/config
syz repro: https://ci.syzbot.org/findings/8fa94c36-acda-4fe5-a760-1dea60977f77/syz_repro

------------[ cut here ]------------
kernel BUG at mm/page_table_check.c:83!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 5817 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:page_table_check_clear+0x4ec/0x500 mm/page_table_check.c:83
Code: 89 e7 e8 f7 1a f4 ff e9 bd fb ff ff e8 4d 37 83 ff 90 0f 0b e8 45 37 83 ff 90 0f 0b e8 3d 37 83 ff 90 0f 0b e8 35 37 83 ff 90 <0f> 0b e8 2d 37 83 ff 90 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc900035eed50 EFLAGS: 00010293
RAX: ffffffff8244dd9b RBX: 0000000000000200 RCX: ffff88810d88bc00
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffff888104dea000 R08: ffff888104dea04b R09: 1ffff110209bd409
R10: dffffc0000000000 R11: ffffed10209bd40a R12: 00000000ffffffff
R13: 0000000000000001 R14: ffff888104dea048 R15: 0000000000116200
FS:  00007f8b11ee36c0(0000) GS:ffff88818c4c0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000140 CR3: 0000000112c36000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 page_table_check_pmd_clear include/linux/page_table_check.h:64 [inline]
 pmdp_invalidate+0x2fc/0x310 mm/pgtable-generic.c:206
 __split_huge_pmd_locked mm/huge_memory.c:3323 [inline]
 split_huge_pmd_locked+0x100a/0x2e50 mm/huge_memory.c:3476
 __split_huge_pmd+0x202/0x2e0 mm/huge_memory.c:3490
 zap_pmd_range mm/memory.c:2136 [inline]
 zap_pud_range mm/memory.c:2179 [inline]
 zap_p4d_range mm/memory.c:2200 [inline]
 __zap_vma_range+0xb85/0x4f80 mm/memory.c:2240
 zap_vma_range_batched+0x3e0/0x5b0 mm/memory.c:2351
 madvise_dontneed_single_vma mm/madvise.c:868 [inline]
 madvise_dontneed_free mm/madvise.c:959 [inline]
 madvise_vma_behavior+0x252b/0x41d0 mm/madvise.c:1370
 madvise_walk_vmas+0x924/0xb00 mm/madvise.c:1687
 madvise_do_behavior+0x385/0x540 mm/madvise.c:1916
 do_madvise+0x327/0x3a0 mm/madvise.c:2014
 __do_sys_madvise mm/madvise.c:2023 [inline]
 __se_sys_madvise mm/madvise.c:2021 [inline]
 __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2021
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8b10f9f559
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:00007f8b11ee3028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f8b11225fa0 RCX: 00007f8b10f9f559
RDX: 0000000000000004 RSI: 0000000000003000 RDI: 000020000015e000
RBP: 00007f8b11036b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8b11226038 R14: 00007f8b11225fa0 R15: 00007fff02a6aba8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:page_table_check_clear+0x4ec/0x500 mm/page_table_check.c:83
Code: 89 e7 e8 f7 1a f4 ff e9 bd fb ff ff e8 4d 37 83 ff 90 0f 0b e8 45 37 83 ff 90 0f 0b e8 3d 37 83 ff 90 0f 0b e8 35 37 83 ff 90 <0f> 0b e8 2d 37 83 ff 90 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc900035eed50 EFLAGS: 00010293
RAX: ffffffff8244dd9b RBX: 0000000000000200 RCX: ffff88810d88bc00
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffff888104dea000 R08: ffff888104dea04b R09: 1ffff110209bd409
R10: dffffc0000000000 R11: ffffed10209bd40a R12: 00000000ffffffff
R13: 0000000000000001 R14: ffff888104dea048 R15: 0000000000116200
FS:  00007f8b11ee36c0(0000) GS:ffff88818c4c0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000140 CR3: 0000000112c36000 CR4: 00000000000006f0


***

If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
  Tested-by: syzbot@syzkaller.appspotmail.com

---
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