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Tue, 09 Jan 2024 11:26:38 -0800 (PST) MIME-Version: 1.0 References: <000000000000ef988f060e876862@google.com> In-Reply-To: <000000000000ef988f060e876862@google.com> From: Yang Shi Date: Tue, 9 Jan 2024 11:26:26 -0800 Message-ID: Subject: Re: [syzbot] [mm?] WARNING in hpage_collapse_scan_pmd To: syzbot , Peter Xu Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 6BAC54000A X-Rspam-User: X-Stat-Signature: r1rmoci1im78ebhx5qh1f98o8j5udsik X-Rspamd-Server: rspam03 X-HE-Tag: 1704828399-483969 X-HE-Meta: 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 s3akjg+3 fsNEnFX8DLYT/SLLvimZ/Fig0uYIljXX5QxQNdg2z4lqyh38mSgQkSQ3wkzM07ae2+Ad/DO0PuyqnBlqLu21TsgSkKdw1tQF8S9g6qJohOthA+nXQfr+2w3cXEgHvQtc9oVMmGb7GNlxdJ/ymqRF6/6HHAIG5dmAi6bAWqv0tO0HxKALETmWdxtzHJHzlkqPDUIVg8NGN+ALUicLWuwlt4ewIPamVP58wlpwLxCsfNfoVc/ItML67cOn1N4Qw7fTrqE5tWkH4Nb5GvprlP7m1PA4OU2DlI8Wim5EHF1vaJeKwqPcihh/lBh0gj01ZgZjfaTRdVHUKDWQevLbWMSLrYcbgHAPLpRkRDFBqBDMHVyoOhCdqww7JdIhbjLHi1rvWEkKKtnzuiDgL2YhpwrIrYh9aQBWhvp8k9gr9XuQceowKV/lU9wDtb7dDg/3kUf+pvJc/CGNPfPUaho0NLaF85MFGp9y2YjyTCWje2S3lOOEY6ddi1ZpwYy9hCj5HSAoUgxbhhVJ8fDskOizyIuqvR/HJUTzTrVxRA0QQ7MYHkRcsx0C/MC+gGim/3JSbn9KW8RfH6DmbtDzyzhtYIBeq1QctrfCaIatOmsR99vghCaoj/GoCeCQd5JlPlbFTCXgBugJYpS8maKPvt43MV4uYd2IXoqsHJhMcOxIFwoJ13Dt18300aGiua7fQsH7oKwMSgPVZucCBXh1NNEdcF5u+zkfzGtdA8/eLhktWcVkx5SclKVnjxwqOIpZrwElmGNJRCKMIMF2E+uWJ5VCbkQoHL/89wI7dHHcvlvmZVrwFtJ4Yp8gHcJDpSzNfr/svrEJCWqgARkYt9ahpr5Hj3KihCtTRut6h7dRUQL73ie0R5lM/WVQ26+axGaswE99O5naMNI4IYZAgwVE3UwIQmCOHaFjsqIKy/sqysj8pVpn55mJuBV8Hdx7JTSRHmC9J28Q/Rjz4NbKjnbs0KZ+rGGRy5z5i2JoV SYoyslR5 OeFIm53Xch84jhO0VB1LKjEySb0G452dxC72kbTPrkATKtZh7uphqNLofgvcUoHNVbPh07FZEL9bik3BqQdbllp2HrpiA3Sb4gPvyrSFBvbkzAkAE6AnCsRCH2dPflfNAQQJHYlvKsSY64NyAdB3Gtk1bkxtatghuOv2Z1vglObtwNeIYY1WJA== 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 Tue, Jan 9, 2024 at 10:23=E2=80=AFAM syzbot wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 5eff55d725a4 Merge tag 'platform-drivers-x86-v6.7-7' of g= i.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=3D17472409e8000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D655f8abe9fe69= b3b > dashboard link: https://syzkaller.appspot.com/bug?extid=3Ded79e0896ae923d= e13fa > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Deb= ian) 2.40 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/496bf4f0c628/dis= k-5eff55d7.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/43482bd7ec93/vmlinu= x-5eff55d7.xz > kernel image: https://storage.googleapis.com/syzbot-assets/fa81d2743202/b= zImage-5eff55d7.xz > > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+ed79e0896ae923de13fa@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 35 at arch/x86/include/asm/pgtable.h:403 pte_uffd_wp= arch/x86/include/asm/pgtable.h:403 [inline] > WARNING: CPU: 1 PID: 35 at arch/x86/include/asm/pgtable.h:403 hpage_colla= pse_scan_pmd+0x233e/0x4fe0 mm/khugepaged.c:1309 > Modules linked in: > CPU: 1 PID: 35 Comm: khugepaged Not tainted 6.7.0-rc8-syzkaller-00055-g5e= ff55d725a4 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS G= oogle 11/17/2023 > RIP: 0010:pte_uffd_wp arch/x86/include/asm/pgtable.h:403 [inline] Khugepaged saw a uffd wp PTE is writable. Khugepaged just scans the page table at this stage, so it sounds like something is out of sync? Cc'ed Peter. > RIP: 0010:hpage_collapse_scan_pmd+0x233e/0x4fe0 mm/khugepaged.c:1309 > Code: 24 d8 00 00 00 49 81 c6 00 10 00 00 4c 3b b4 24 f0 00 00 00 0f 83 a= 8 06 00 00 e8 bd 72 9d ff e9 61 fc ff ff e8 b3 72 9d ff 90 <0f> 0b 90 41 bc= 09 00 00 00 45 31 f6 e9 45 f4 ff ff e8 9c 72 9d ff > RSP: 0018:ffffc90000abf780 EFLAGS: 00010293 > RAX: ffffffff81f1073d RBX: 0000000000000002 RCX: ffff8880142f1dc0 > RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 > RBP: ffffc90000abfbf0 R08: ffffffff81f0ea47 R09: 1ffffd400022a006 > R10: dffffc0000000000 R11: fffff9400022a007 R12: 00000000203ea000 > R13: 1ffff92000157f14 R14: 00000000455eac67 R15: 00000000000001ea > FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f942157a038 CR3: 000000008cd03000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > khugepaged_scan_mm_slot mm/khugepaged.c:2415 [inline] > khugepaged_do_scan mm/khugepaged.c:2503 [inline] > khugepaged+0x9bf/0x17a0 mm/khugepaged.c:2559 > kthread+0x2d3/0x370 kernel/kthread.c:388 > ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 > ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 > > > > --- > 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 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 >