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bh=UCyiu0MqqS19+lZgnlc6a3l76NggCl8OTpzsm5nRp4Y=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=Bwvbfji6t3wccvTv7HhYeTshSx1BlFaRjCxxQsQfHVU5/3NdoINAdlveqeiSfDAxM yZUlxeiTsByih50GA6MnK0LlHWCdDzydKurb3wtMiHTiQJI9qKubtukJVmDy4iFcvj nzPidM6lN9p9r51dh0kifWQPuM3TN7A1NK/YgSK4= Date: Wed, 8 Mar 2023 12:24:57 -0800 From: Andrew Morton To: syzbot Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, Liam Howlett Subject: Re: [syzbot] [mm?] kernel BUG in find_mergeable_anon_vma Message-Id: <20230308122457.c5620872df8e70c7f0621417@linux-foundation.org> In-Reply-To: <000000000000b0a65805f663ace6@google.com> References: <000000000000b0a65805f663ace6@google.com> X-Mailer: Sylpheed 3.7.0 (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-Server: rspam05 X-Rspamd-Queue-Id: 028C98000D X-Stat-Signature: hh9x1nohogwg9tcinba5ywtktqnsh8ya X-Rspam-User: X-HE-Tag: 1678307099-685642 X-HE-Meta: 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 9FmMX6rm 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 iunQQU+y VZmHyNRr7MtAX3g0m1PP7CMiMyzb9/gs9cWI8YQ18Sv3iQUzkrdkojUUwgImHTPerR2jNygdHTIc8pz7QtkFAIVbTf3tjsKNgTAG5su4j5swyoEdCwlN36Tg0YmrY5cO3Ksxg5Fd0UI= 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: (cc Liam) On Wed, 08 Mar 2023 05:40:42 -0800 syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 0988a0ea7919 Merge tag 'for-v6.3-part2' of git://git.kerne.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=13fc4754c80000 > kernel config: https://syzkaller.appspot.com/x/.config?x=cab35c936731a347 > dashboard link: https://syzkaller.appspot.com/bug?extid=8d95422d3537159ca390 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=130602bcc80000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10b61b54c80000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/e2d28852dbc0/disk-0988a0ea.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/9ad7e6fa3a8d/vmlinux-0988a0ea.xz > kernel image: https://storage.googleapis.com/syzbot-assets/7430e1576859/bzImage-0988a0ea.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+8d95422d3537159ca390@syzkaller.appspotmail.com > > pgoff 20000 file 0000000000000000 private_data 0000000000000000 > flags: 0x8102172(write|mayread|maywrite|mayexec|growsdown|locked|account|softdirty) > ------------[ cut here ]------------ > kernel BUG at mm/mmap.c:1108! Thanks. That's VM_BUG_ON_VMA(prev != vma, vma); > invalid opcode: 0000 [#1] PREEMPT SMP KASAN > CPU: 1 PID: 24456 Comm: syz-executor216 Not tainted 6.2.0-syzkaller-13467-g0988a0ea7919 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 > RIP: 0010:find_mergeable_anon_vma+0x6f0/0x840 mm/mmap.c:1108 > Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 6b 48 3b 6b 50 0f 85 08 fb ff ff e9 06 fb ff ff e8 58 ad bf ff 48 89 ef e8 70 a5 fa ff <0f> 0b 4c 89 f7 e8 06 29 11 00 e9 d2 f9 ff ff e8 fc 28 11 00 e9 a0 > RSP: 0018:ffffc9000b61f888 EFLAGS: 00010286 > RAX: 0000000000000130 RBX: 0000000000000000 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffffffff816931bc RDI: 0000000000000005 > RBP: ffff8880783f97e0 R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000080000000 R11: 0000000000000000 R12: ffffc9000b61f8b0 > R13: 1ffff920016c3f12 R14: ffff8880783f97e8 R15: fff0000000000fff > FS: 00007fe0f1f58700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007ffc5b9a8960 CR3: 000000002bd88000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > __anon_vma_prepare+0x7d/0x580 mm/rmap.c:199 > anon_vma_prepare include/linux/rmap.h:159 [inline] > do_anonymous_page mm/memory.c:4050 [inline] > handle_pte_fault mm/memory.c:4907 [inline] > __handle_mm_fault+0x3a8f/0x3e60 mm/memory.c:5051 > handle_mm_fault+0x2ba/0x9c0 mm/memory.c:5197 > faultin_page mm/gup.c:925 [inline] > __get_user_pages+0x4da/0xf30 mm/gup.c:1147 > populate_vma_page_range+0x2df/0x420 mm/gup.c:1543 > __mm_populate+0x105/0x3b0 mm/gup.c:1652 > mm_populate include/linux/mm.h:3026 [inline] > vm_mmap_pgoff+0x201/0x280 mm/util.c:547 > ksys_mmap_pgoff+0x7d/0x5a0 mm/mmap.c:1410 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > RIP: 0033:0x7fe0f1fa6959 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fe0f1f582f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 > RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fe0f1fa6959 > RDX: 0000000000000002 RSI: 0000000000001000 RDI: 0000000020002000 > RBP: 00007fe0f202e3e8 R08: 00000000ffffffff R09: 0000000000000000 > R10: 840000000000a132 R11: 0000000000000246 R12: 840000000000a132 > R13: 00007fe0f202e3e0 R14: 00007fe0f202e3ec R15: 0000000000022000 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:find_mergeable_anon_vma+0x6f0/0x840 mm/mmap.c:1108 > Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 6b 48 3b 6b 50 0f 85 08 fb ff ff e9 06 fb ff ff e8 58 ad bf ff 48 89 ef e8 70 a5 fa ff <0f> 0b 4c 89 f7 e8 06 29 11 00 e9 d2 f9 ff ff e8 fc 28 11 00 e9 a0 > RSP: 0018:ffffc9000b61f888 EFLAGS: 00010286 > RAX: 0000000000000130 RBX: 0000000000000000 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffffffff816931bc RDI: 0000000000000005 > RBP: ffff8880783f97e0 R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000080000000 R11: 0000000000000000 R12: ffffc9000b61f8b0 > R13: 1ffff920016c3f12 R14: ffff8880783f97e8 R15: fff0000000000fff > FS: 00007fe0f1f58700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fe0f1ffc01d CR3: 000000002bd88000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > --- > 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. > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches