linux-kernel - [syzbot] [mm?] kernel BUG in page_table_check

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Message-ID: <68a7ef20.050a0220.37038e.004d.GAE@google.com>
Date: Thu, 21 Aug 2025 21:16:32 -0700
From: syzbot <syzbot+49a796ed2c9709652f1e@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, pasha.tatashin@...een.com, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [mm?] kernel BUG in page_table_check_set

Hello,

syzbot found the following issue on:

HEAD commit:    8f5ae30d69d7 Linux 6.17-rc1
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=15f926f0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c5ac3d8b8abfcb
dashboard link: https://syzkaller.appspot.com/bug?extid=49a796ed2c9709652f1e
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15faa7a2580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=144143bc580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/18a2e4bd0c4a/disk-8f5ae30d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3b5395881b25/vmlinux-8f5ae30d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e875f4e3b7ff/Image-8f5ae30d.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+49a796ed2c9709652f1e@...kaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at mm/page_table_check.c:118!
Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 6740 Comm: syz.0.17 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : page_table_check_set+0x584/0x590 mm/page_table_check.c:118
lr : page_table_check_set+0x584/0x590 mm/page_table_check.c:118
sp : ffff80009c9674c0
x29: ffff80009c9674d0 x28: ffff80008fae0000 x27: 0000000000000002
x26: ffff0000c079ca80 x25: 0000000000000001 x24: 0000000000000001
x23: ffff0000c079ca80 x22: 000000000012b950 x21: 0000000000000001
x20: 0000000000000003 x19: 1ffff00012eb65b0 x18: 0000000000000000
x17: 0000000000000000 x16: ffff800080528a28 x15: 0000000000000001
x14: 1fffe000180f3950 x13: 0000000000000000 x12: 0000000000000000
x11: ffff6000180f3951 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000cdb05b80 x7 : ffff800080d16554 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800080d15b5c
x2 : 0000000000000001 x1 : 0000000000000002 x0 : 0000000000000001
Call trace:
 page_table_check_set+0x584/0x590 mm/page_table_check.c:118 (P)
 __page_table_check_ptes_set+0x2a8/0x2e0 mm/page_table_check.c:209
 page_table_check_ptes_set include/linux/page_table_check.h:76 [inline]
 __set_ptes_anysz arch/arm64/include/asm/pgtable.h:709 [inline]
 __set_ptes+0x4a0/0x504 arch/arm64/include/asm/pgtable.h:741
 contpte_set_ptes+0x120/0x188 arch/arm64/mm/contpte.c:464
 set_ptes arch/arm64/include/asm/pgtable.h:1794 [inline]
 modify_prot_commit_ptes+0x4e4/0x694 arch/arm64/mm/mmu.c:1556
 prot_commit_flush_ptes mm/mprotect.c:197 [inline]
 commit_anon_folio_batch mm/mprotect.c:246 [inline]
 set_write_prot_commit_flush_ptes mm/mprotect.c:273 [inline]
 change_pte_range mm/mprotect.c:354 [inline]
 change_pmd_range mm/mprotect.c:570 [inline]
 change_pud_range mm/mprotect.c:633 [inline]
 change_p4d_range mm/mprotect.c:659 [inline]
 change_protection_range mm/mprotect.c:687 [inline]
 change_protection+0x1e84/0x3ff0 mm/mprotect.c:721
 mprotect_fixup+0x504/0x744 mm/mprotect.c:837
 do_mprotect_pkey+0x864/0xb30 mm/mprotect.c:993
 __do_sys_mprotect mm/mprotect.c:1014 [inline]
 __se_sys_mprotect mm/mprotect.c:1011 [inline]
 __arm64_sys_mprotect+0x80/0x98 mm/mprotect.c:1011
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
Code: d4210000 97e865fd d4210000 97e865fb (d4210000) 
---[ end trace 0000000000000000 ]---


---
This report is generated by a bot. It may contain errors.
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If the report is already addressed, let syzbot know by replying with:
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