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 X-Spam-Level: X-Spam-Status: No, score=-8.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B7DF2C4727C for ; Sat, 26 Sep 2020 03:21:19 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 15F7721741 for ; Sat, 26 Sep 2020 03:21:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 15F7721741 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 3D7336B005C; Fri, 25 Sep 2020 23:21:18 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 387736B0062; Fri, 25 Sep 2020 23:21:18 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 29D9D6B0068; Fri, 25 Sep 2020 23:21:18 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0192.hostedemail.com [216.40.44.192]) by kanga.kvack.org (Postfix) with ESMTP id 11B7D6B005C for ; Fri, 25 Sep 2020 23:21:18 -0400 (EDT) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id AF51C8249980 for ; Sat, 26 Sep 2020 03:21:17 +0000 (UTC) X-FDA: 77303761794.17.coal87_54121fe2716d Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin17.hostedemail.com (Postfix) with ESMTP id 8E371180D0180 for ; Sat, 26 Sep 2020 03:21:17 +0000 (UTC) X-HE-Tag: coal87_54121fe2716d X-Filterd-Recvd-Size: 7060 Received: from mail-il1-f197.google.com (mail-il1-f197.google.com [209.85.166.197]) by imf40.hostedemail.com (Postfix) with ESMTP for ; Sat, 26 Sep 2020 03:21:17 +0000 (UTC) Received: by mail-il1-f197.google.com with SMTP id i3so3935695ilr.11 for ; Fri, 25 Sep 2020 20:21:17 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=4VbAGN7iQiSvF2eC6i+kemaMInFiN1WW0i62tJqGJwQ=; b=XFCiOfcPfWKmlOckRBJiaWSaPS8Okb5L+6bR/IzR/7h5u9CJQcC90KwRenkGRrmUic x6HEmlP9W6ihQkJtf+qq99ecw4MXyJHghlIS6BqcenUevdaH33y4fzqO9EdvYv++PF1+ aPw0xrAm6XyVNKQZGR1clrebZDb+aqiyc0FNhrX94VTLGlBdEGUpqa4/N0gYXfSEoWDC pHQSvGoaBQ4D31TMeanFBJek9uIeVwYKbpFU+YppX61M6QBck9YchuvPDmH2WVXkEp7+ 9zhfVxJfhb+n/1od876rvWZ+CvBl7UlC9Plh/trZ303Mb+CiP4JRwzbRHL5SDnpIHSpT brlg== X-Gm-Message-State: AOAM530UvHzYQSYugLvHhmnZ1abX64aBy2y7RdbAOjzN1DF0qSsUehoi ZYKLzyJtvXKmXnRn2PWQ3uu7O42ivdtA7PNYaI3Xybwvr05l X-Google-Smtp-Source: ABdhPJy1vPhWdzPcDPZZS4TuN/BzMYt9kc9narTQDbAVymusZ6MumpoKEizvR46BGsiB6cx5uJ4B/aEjtAmxfNvnDn1nU7NI8iZX MIME-Version: 1.0 X-Received: by 2002:a5d:8e14:: with SMTP id e20mr1111795iod.119.1601090476604; Fri, 25 Sep 2020 20:21:16 -0700 (PDT) Date: Fri, 25 Sep 2020 20:21:16 -0700 In-Reply-To: <0000000000005103e405a3a66ecd@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000001cab5d05b02eed75@google.com> Subject: Re: kernel BUG at include/linux/mm.h:LINE! (6) From: syzbot To: akpm@linux-foundation.org, bp@alien8.de, dave.hansen@linux.intel.com, hannes@cmpxchg.org, hdanton@sina.com, hpa@zytor.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, luto@kernel.org, mhocko@kernel.org, minchan@kernel.org, mingo@redhat.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.048811, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: syzbot has found a reproducer for the following issue on: HEAD commit: 171d4ff7 Merge tag 'mmc-v5.9-rc4-2' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1197c517900000 kernel config: https://syzkaller.appspot.com/x/.config?x=240e2ebab67245c7 dashboard link: https://syzkaller.appspot.com/bug?extid=a923008018a2d298247b compiler: gcc (GCC) 10.1.0-syz 20200507 userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10c679ad900000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1125efab900000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a923008018a2d298247b@syzkaller.appspotmail.com raw: 0000000000000000 ffff888096b02ae0 00000001ffffffff 0000000000000000 page dumped because: VM_BUG_ON_PAGE(page->pmd_huge_pte) ------------[ cut here ]------------ kernel BUG at include/linux/mm.h:2260! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 6951 Comm: syz-executor101 Not tainted 5.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:pgtable_pmd_page_dtor include/linux/mm.h:2260 [inline] RIP: 0010:pgtable_pmd_page_dtor include/linux/mm.h:2257 [inline] RIP: 0010:___pmd_free_tlb+0x108/0x140 arch/x86/mm/pgtable.c:72 Code: ee e8 5c 8e fe ff 66 90 5b 5d 41 5c 41 5d c3 e8 de 95 40 00 0f 0b e8 d7 95 40 00 48 c7 c6 40 20 89 88 48 89 ef e8 a8 90 6f 00 <0f> 0b e8 c1 95 40 00 0f 0b 48 c7 c7 68 6c fc 89 e8 23 69 81 00 e9 RSP: 0018:ffffc900061678c0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 000000000008fef6 RCX: ffffffff81a54935 RDX: ffff88808e70a1c0 RSI: ffffffff81a54984 RDI: ffffea00023fbdb8 RBP: ffffea00023fbd80 R08: 0000000000000037 R09: ffff8880ae5318e7 R10: ffffffffffffffff R11: 0000000000000000 R12: ffffc90006167a20 R13: ffff88808fef6000 R14: 0000000021000fff R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000080fd718 CR3: 000000008e534000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __pmd_free_tlb arch/x86/include/asm/pgalloc.h:95 [inline] free_pmd_range mm/memory.c:255 [inline] free_pud_range mm/memory.c:273 [inline] free_p4d_range mm/memory.c:307 [inline] free_pgd_range+0xa3f/0xf90 mm/memory.c:387 free_pgtables+0x230/0x2f0 mm/memory.c:419 exit_mmap+0x2c0/0x530 mm/mmap.c:3184 __mmput+0x122/0x470 kernel/fork.c:1076 mmput+0x53/0x60 kernel/fork.c:1097 exit_mm kernel/exit.c:483 [inline] do_exit+0xa8b/0x29f0 kernel/exit.c:793 do_group_exit+0x125/0x310 kernel/exit.c:903 get_signal+0x428/0x1f00 kernel/signal.c:2757 arch_do_signal+0x82/0x2520 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x1ae/0x200 kernel/entry/common.c:192 syscall_exit_to_user_mode+0x7e/0x2e0 kernel/entry/common.c:267 __do_fast_syscall_32+0x6c/0x90 arch/x86/entry/common.c:138 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f80549 Code: Bad RIP value. RSP: 002b:00000000f7f7b1ec EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 RAX: fffffffffffffe00 RBX: 00000000080fafe8 RCX: 0000000000000080 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace f578be228b447c1d ]--- RIP: 0010:pgtable_pmd_page_dtor include/linux/mm.h:2260 [inline] RIP: 0010:pgtable_pmd_page_dtor include/linux/mm.h:2257 [inline] RIP: 0010:___pmd_free_tlb+0x108/0x140 arch/x86/mm/pgtable.c:72 Code: ee e8 5c 8e fe ff 66 90 5b 5d 41 5c 41 5d c3 e8 de 95 40 00 0f 0b e8 d7 95 40 00 48 c7 c6 40 20 89 88 48 89 ef e8 a8 90 6f 00 <0f> 0b e8 c1 95 40 00 0f 0b 48 c7 c7 68 6c fc 89 e8 23 69 81 00 e9 RSP: 0018:ffffc900061678c0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 000000000008fef6 RCX: ffffffff81a54935 RDX: ffff88808e70a1c0 RSI: ffffffff81a54984 RDI: ffffea00023fbdb8 RBP: ffffea00023fbd80 R08: 0000000000000037 R09: ffff8880ae5318e7 R10: ffffffffffffffff R11: 0000000000000000 R12: ffffc90006167a20 R13: ffff88808fef6000 R14: 0000000021000fff R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f7f5a22c CR3: 0000000088483000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400