(cc Liam) On Wed, 08 Mar 2023 05:40:42 -0800 syzbot <syzbot+8d95422d3537159ca390@xxxxxxxxxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxxxxxx > > 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: > <TASK> > __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 > </TASK> > 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@xxxxxxxxxxxxxxxx. > > 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
