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b=OnCzMbG8BtPUs5b7VgQBWOaxM9mYQLdnuvEtBt5p69Z+QYGc0QnWZHVbikSJ1455z reI6IDL2IFI5hbKcDqyxgzY+gmbD9A6ihJ8o6kMgi7ISKmVGt8Yi8ojcBK5PUvOvtw DHq+SPW8KSTwsJRAmk2MQKh1qOfmHQ9PLas+3Rlc= Date: Fri, 22 Aug 2025 18:16:53 -0700 From: Andrew Morton To: syzbot Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, pasha.tatashin@soleen.com, syzkaller-bugs@googlegroups.com, Andrew Donnellan Subject: Re: [syzbot] [mm?] kernel BUG in page_table_check_set Message-Id: <20250822181653.cd2024360870ef94cdb7db07@linux-foundation.org> In-Reply-To: <68a7ef20.050a0220.37038e.004d.GAE@google.com> References: <68a7ef20.050a0220.37038e.004d.GAE@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 6C991140007 X-Stat-Signature: zddxy84buxdeccyon5pxz1fe4xputsdz X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1755911815-508458 X-HE-Meta: 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 nZlyh13I 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 XYjQlZ8y v4C8uBhDm6GcenMqj7u7oUeLZwmHU6nrvS7ZbGFD6WFXkSbWDnDUdgP5P/jFmi9QLVguxuoO/oGP9bzFC9mQ1xw0PraFjtgGULBaGM7GMemKwqYq4QtPav/PEsQw8Pr4MC9rIWKETZ0gHFRvL9I6ng== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, 21 Aug 2025 21:16:32 -0700 syzbot wrote: > 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@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > kernel BUG at mm/page_table_check.c:118! Thanks. Presumably due to the series "Support page table check on PowerPC". Andrew, could you please take a look? The series has been in mm.git for a week so I guess the impact of this is small. I won't drop it at this time, but prompt attention would be appreciated. > 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. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup