From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5AB8DC83F26 for ; Tue, 29 Jul 2025 02:51:15 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EC05E6B007B; Mon, 28 Jul 2025 22:51:14 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E71A96B0089; Mon, 28 Jul 2025 22:51:14 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D602B6B008A; Mon, 28 Jul 2025 22:51:14 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id C4C616B007B for ; Mon, 28 Jul 2025 22:51:14 -0400 (EDT) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 49D86113716 for ; Tue, 29 Jul 2025 02:51:14 +0000 (UTC) X-FDA: 83715775668.23.76C70DD Received: from mail-qt1-f177.google.com (mail-qt1-f177.google.com [209.85.160.177]) by imf29.hostedemail.com (Postfix) with ESMTP id 674E9120004 for ; Tue, 29 Jul 2025 02:51:12 +0000 (UTC) Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=google.com header.s=20230601 header.b=rnmknaMK; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf29.hostedemail.com: domain of surenb@google.com designates 209.85.160.177 as permitted sender) smtp.mailfrom=surenb@google.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1753757472; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=rP4nJ7QVKuQ6dIL817mkYQc9jCgroNaq8Iqx4W9HDXs=; b=1v6/yFJyqhyeFwCwcyLffaUdA4UTAAcW5eFa20hQVmbTKXHtqn8/RJ0PUoi6EwxsXYnU1f L44F8AXMloxqnWntOHdXLsUg5/WDQAlWfTDK7p4RvD6uGHHoQRJfDwEmffcl/r9HP8/OBT 9AnVBRxYq7NsgsLp1La2l2SHuJkWIA8= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1753757472; a=rsa-sha256; cv=none; b=U0cQ6G4tMB4l5tcUO03nIib5BXIASwlBN9VfGRVM0FX1fCoRmM3hNmT0oSoynG7cF+y6mV WItfzioSk1k60U9yswwyD8J+AHJq6dhGjqqfkcEnZa69kMghoOP9gxg1Tvpn0t+PCqYBVJ yVMXC4KfBJPXIFGTTGXPuf3o1IsCVnE= ARC-Authentication-Results: i=1; imf29.hostedemail.com; dkim=pass header.d=google.com header.s=20230601 header.b=rnmknaMK; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf29.hostedemail.com: domain of surenb@google.com designates 209.85.160.177 as permitted sender) smtp.mailfrom=surenb@google.com Received: by mail-qt1-f177.google.com with SMTP id d75a77b69052e-4ab3ad4c61fso240981cf.0 for ; Mon, 28 Jul 2025 19:51:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1753757471; x=1754362271; darn=kvack.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=rP4nJ7QVKuQ6dIL817mkYQc9jCgroNaq8Iqx4W9HDXs=; b=rnmknaMKDp4W+NdSLcR/P84Z7glkWlrxylrXmD8fDTZr2XV88i4BKsfCPYeWzCa+fM Mzck7oyuyU141FuQDoztR8fOuSFUwHc1NvbU42ox/yRUy5+9mR0z7hQN37oh6MJoX2UP dhXWv31yhPWofaiPIhdxFomUNgFFnewDPbV5DcjYFFl9GTgpmbY2M7VvmY5i9k3j9CO4 K9V/kfN4bzLwnh6DKMkpgwalnQxSBf4aA1I6nkPkAf29tnunrmtLwoaD7iEtvbSEStHp IyVkf7G5dKPhTHCQvjNU4sm2vKkH4MSHksFVwNk4I0SPu3qBDAkws0nuOqBInztNs5Ub bxVw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1753757471; x=1754362271; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=rP4nJ7QVKuQ6dIL817mkYQc9jCgroNaq8Iqx4W9HDXs=; b=YuEud0dK2FqTFAOhpbnoyu6Y64u2LcpABe3+q07PaOJtRJfSyywhc09YSPyz4UewRL Qua0drqdLswDpPiF1cn29iucDE31Ou/zhoGAn+RbdqnUaQMfuJv97NK9VPUv/01wBekO etIgev390P2mNsLvYVGYzdo64g42Zq2GOel0pc7087Ww8aTaQw3uyBM4rX7h7zUB287E 6Jg04dZXMjcCggfcU3tN1aFhwKkgzq2y89ThhFq3WSpLzEikRBTXtecU5Sx4nq4mYgZt ZhNbjoiovDg0HtPvRifC3gKZNeBlUsfaSyhgSR83uFBS4ElHScKuJke8+oZTGZ/jav7i jYlQ== X-Forwarded-Encrypted: i=1; AJvYcCV8Ge5spfYzdoCYl+vS3EpAdgY5B+hk6i5QEKHZzc2WOIw68sJyQOsKrv2ViYqFqqpnNEs5iyr/qg==@kvack.org X-Gm-Message-State: AOJu0YyMqn2QgXHbd/g3QkVlFEHvqr8Rg7XRxl2FcBXdrtAbHSDQ2fqz dabG7ygu0gj/v2YXvzdNMj6fWCVOK/4dYFq12SqDGQHd7vWGHbY/eVNiNlvMR389JWrYT/mhzGx nx52qEAQrcatvD3trYMeKc8PwwRvxWrXbY1FOX2pq X-Gm-Gg: ASbGncts5ohAcqrgkcfzuMPxnVobWFMKUU+UB4FBjF9wt8o+87pGjIWptoaEAHMX7l7 DKVLGkI5ZQA5216jIS3bMXK7ADC5aU73SYg/ElAOeVpcwrgRHmCZ0yDFvv7qdvriHAb2orMEU+I QSHRx1OOvKjr7WqhbOPL4RTuSXxYwwLhdb8FEbhumikW6VojvuJOd2GjtNrcMmLH562Nr28j5HT O2a45Pjsy/0Fwo4lsxEMjUId1O5p8UDALQ= X-Google-Smtp-Source: AGHT+IGyI4KuVMOu/ABy9Gmqs9xFZsf4rHRJ3lGsTjRW6FqT11tApijS68uAhbGR/B5/E2Yy8R0tlPFH4KUT9S2LiBc= X-Received: by 2002:a05:622a:215:b0:4a9:a4ef:35c2 with SMTP id d75a77b69052e-4aecf9d2793mr1190081cf.23.1753757471101; Mon, 28 Jul 2025 19:51:11 -0700 (PDT) MIME-Version: 1.0 References: <68794b5c.a70a0220.693ce.0050.GAE@google.com> In-Reply-To: From: Suren Baghdasaryan Date: Tue, 29 Jul 2025 02:51:00 +0000 X-Gm-Features: Ac12FXxkdhvQM-2FTNyBaLgIo3h_qmvhR-ZEgqZTcFlI_763WaZT8GyJ4e8N0TM Message-ID: Subject: Re: [syzbot] [mm?] BUG: unable to handle kernel paging request in move_pages To: Peter Xu Cc: syzbot , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, Lokesh Gidra Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 674E9120004 X-Stat-Signature: wqxr58o6ctktakxu6r6ojqj5kfpfyi9s X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1753757472-286028 X-HE-Meta: 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 6KljSBOO 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 3Wf7crzt +A0RADn8QDp2sjByKmOwb3NjOwdTC5fZdTprPAu1w4aXzCMCFA0TWKvZ1ZmWl7qvBMBl4/2FWe3W37GFNEh3oQ== 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 Mon, Jul 28, 2025 at 9:08=E2=80=AFPM Peter Xu wrote: > > Copy Lokesh and Suren. Thanks! I'll take a closer look tomorrow morning. > > On Thu, Jul 17, 2025 at 12:13:32PM -0700, syzbot wrote: > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: e8352908bdcd Add linux-next specific files for 20250716 > > git tree: linux-next > > console+strace: https://syzkaller.appspot.com/x/log.txt?x=3D17f81382580= 000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=3Db7b0e60e17d= c5717 > > dashboard link: https://syzkaller.appspot.com/bug?extid=3Db446dbe27035e= f6bd6c2 > > compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6= 049-1~exp1~20250616065826.132), Debian LLD 20.1.7 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D100413825= 80000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D10eb158c580= 000 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/ae8cc81c1781/d= isk-e8352908.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/57aaea991896/vmli= nux-e8352908.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/feb871619bd4= /bzImage-e8352908.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the co= mmit: > > Reported-by: syzbot+b446dbe27035ef6bd6c2@syzkaller.appspotmail.com > > > > BUG: unable to handle page fault for address: ffffea6000391008 > > #PF: supervisor read access in kernel mode > > #PF: error_code(0x0000) - not-present page > > PGD 13fff8067 P4D 13fff8067 PUD 0 > > Oops: Oops: 0000 [#1] SMP KASAN PTI > > CPU: 1 UID: 0 PID: 5860 Comm: syz-executor832 Not tainted 6.16.0-rc6-ne= xt-20250716-syzkaller #0 PREEMPT(full) > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS= Google 05/07/2025 > > RIP: 0010:_compound_head include/linux/page-flags.h:284 [inline] > > RIP: 0010:move_pages+0xbe6/0x1430 mm/userfaultfd.c:1824 > > Code: c1 ec 06 4b 8d 1c 2c 48 83 c3 08 48 89 d8 48 c1 e8 03 48 b9 00 00= 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 9a 30 f4 ff <48> 8b 1b 48 = 89 de 48 83 e6 01 31 ff e8 59 70 8f ff 48 89 d8 48 83 > > RSP: 0018:ffffc90003f778a8 EFLAGS: 00010246 > > RAX: 1ffffd4c00072201 RBX: ffffea6000391008 RCX: dffffc0000000000 > > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > > RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 > > R10: dffffc0000000000 R11: fffff520007eef00 R12: 0000006000391000 > > R13: ffffea0000000000 R14: 200018000e4401fd R15: 00002000003ab000 > > FS: 00007ff35708f6c0(0000) GS:ffff8881258aa000(0000) knlGS:00000000000= 00000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: ffffea6000391008 CR3: 0000000074390000 CR4: 00000000003526f0 > > Call Trace: > > > > userfaultfd_move fs/userfaultfd.c:1923 [inline] > > userfaultfd_ioctl+0x2e8b/0x4c80 fs/userfaultfd.c:2046 > > vfs_ioctl fs/ioctl.c:51 [inline] > > __do_sys_ioctl fs/ioctl.c:598 [inline] > > __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584 > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > RIP: 0033:0x7ff3570d6519 > > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 > > RSP: 002b:00007ff35708f218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > > RAX: ffffffffffffffda RBX: 00007ff357160308 RCX: 00007ff3570d6519 > > RDX: 0000200000000180 RSI: 00000000c028aa05 RDI: 0000000000000003 > > RBP: 00007ff357160300 R08: 0000000000000000 R09: 0000000000000000 > > R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff35712d074 > > R13: 0000200000000180 R14: 0000200000000188 R15: 00002000002b9000 > > > > Modules linked in: > > CR2: ffffea6000391008 > > ---[ end trace 0000000000000000 ]--- > > RIP: 0010:_compound_head include/linux/page-flags.h:284 [inline] > > RIP: 0010:move_pages+0xbe6/0x1430 mm/userfaultfd.c:1824 > > Code: c1 ec 06 4b 8d 1c 2c 48 83 c3 08 48 89 d8 48 c1 e8 03 48 b9 00 00= 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 9a 30 f4 ff <48> 8b 1b 48 = 89 de 48 83 e6 01 31 ff e8 59 70 8f ff 48 89 d8 48 83 > > RSP: 0018:ffffc90003f778a8 EFLAGS: 00010246 > > RAX: 1ffffd4c00072201 RBX: ffffea6000391008 RCX: dffffc0000000000 > > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > > RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 > > R10: dffffc0000000000 R11: fffff520007eef00 R12: 0000006000391000 > > R13: ffffea0000000000 R14: 200018000e4401fd R15: 00002000003ab000 > > FS: 00007ff35708f6c0(0000) GS:ffff8881258aa000(0000) knlGS:00000000000= 00000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: ffffea6000391008 CR3: 0000000074390000 CR4: 00000000003526f0 > > ---------------- > > Code disassembly (best guess): > > 0: c1 ec 06 shr $0x6,%esp > > 3: 4b 8d 1c 2c lea (%r12,%r13,1),%rbx > > 7: 48 83 c3 08 add $0x8,%rbx > > b: 48 89 d8 mov %rbx,%rax > > e: 48 c1 e8 03 shr $0x3,%rax > > 12: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx > > 19: fc ff df > > 1c: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) > > 20: 74 08 je 0x2a > > 22: 48 89 df mov %rbx,%rdi > > 25: e8 9a 30 f4 ff call 0xfff430c4 > > * 2a: 48 8b 1b mov (%rbx),%rbx <-- trapping instructi= on > > 2d: 48 89 de mov %rbx,%rsi > > 30: 48 83 e6 01 and $0x1,%rsi > > 34: 31 ff xor %edi,%edi > > 36: e8 59 70 8f ff call 0xff8f7094 > > 3b: 48 89 d8 mov %rbx,%rax > > 3e: 48 rex.W > > 3f: 83 .byte 0x83 > > > > > > --- > > 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 > > > > -- > Peter Xu >