On Fri, 2018-11-16 at 12:40 -0800, Dmitry Vyukov wrote: > On Sun, Nov 11, 2018 at 10:18 AM, syzbot > <syzbot+13eb7470890c56ce3...@syzkaller.appspotmail.com> wrote: > > Hello, > > > > syzbot found the following crash on: > > > > HEAD commit: 442b8cea2477 Add linux-next specific files for 20181109 > > git tree: linux-next > > console output: https://syzkaller.appspot.com/x/log.txt?x=12b1262b400000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=2f72bdb11df9fbe8 > > dashboard link: https://syzkaller.appspot.com/bug?extid=13eb7470890c56ce3f37 > > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=107566a3400000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11b5fa2b400000 > > > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > > Reported-by: syzbot+13eb7470890c56ce3...@syzkaller.appspotmail.com > > This is another manifestation of the following report, right? > > #syz dup: KASAN: use-after-free Read in locks_delete_block >
Yes, I think so. > > list_del corruption. prev->next should be ffff8801c135f960, but was > > 0000000000000007 > > ------------[ cut here ]------------ > > kernel BUG at lib/list_debug.c:53! > > invalid opcode: 0000 [#1] PREEMPT SMP KASAN > > CPU: 1 PID: 5972 Comm: syz-executor001 Not tainted 4.20.0-rc1-next-20181109+ > > #110 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > > Google 01/01/2011 > > RIP: 0010:__list_del_entry_valid.cold.1+0x48/0x4a lib/list_debug.c:51 > > Code: fe 60 88 e8 72 9b d3 fd 0f 0b 48 89 de 48 c7 c7 40 00 61 88 e8 61 9b > > d3 fd 0f 0b 48 89 de 48 c7 c7 e0 ff 60 88 e8 50 9b d3 fd <0f> 0b 48 89 d9 48 > > c7 c7 a0 00 61 88 e8 3f 9b d3 fd 0f 0b 48 89 f1 > > RSP: 0018:ffff8801c135f750 EFLAGS: 00010286 > > RAX: 0000000000000054 RBX: ffff8801c135f960 RCX: 0000000000000000 > > RDX: 0000000000000000 RSI: ffffffff8165ba15 RDI: 0000000000000005 > > RBP: ffff8801c135f768 R08: ffff8801c11ce080 R09: ffffed003b5e5020 > > R10: ffffed003b5e5020 R11: ffff8801daf28107 R12: ffff8801d945f3a0 > > R13: ffff8801d945f3a0 R14: 0000000000000000 R15: ffff8801c135f838 > > FS: 00007f96b449c700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 000000000046aa40 CR3: 00000001b39ab000 CR4: 00000000001406e0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > Call Trace: > > __list_del_entry include/linux/list.h:117 [inline] > > list_del_init include/linux/list.h:159 [inline] > > __locks_delete_block fs/locks.c:683 [inline] > > locks_delete_block+0xce/0x3d0 fs/locks.c:716 > > locks_mandatory_area+0x48b/0x6a0 fs/locks.c:1398 > > rw_verify_area+0x2f2/0x360 fs/read_write.c:386 > > do_iter_write+0x101/0x5f0 fs/read_write.c:954 > > vfs_writev+0x1f1/0x360 fs/read_write.c:1004 > > do_writev+0x11a/0x310 fs/read_write.c:1039 > > __do_sys_writev fs/read_write.c:1112 [inline] > > __se_sys_writev fs/read_write.c:1109 [inline] > > __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109 > > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > RIP: 0033:0x446619 > > Code: e8 6c b4 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 > > 0f 83 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 > > RSP: 002b:00007f96b449bda8 EFLAGS: 00000297 ORIG_RAX: 0000000000000014 > > RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446619 > > RDX: 0000000000000001 RSI: 0000000020000440 RDI: 0000000000000003 > > RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 > > R10: 0000000000000000 R11: 0000000000000297 R12: 00000000006dbc3c > > R13: 2f30656c69662f2e R14: 64663d736e617274 R15: 00000000006dbd2c > > Modules linked in: > > ---[ end trace efdc3057b60b19f3 ]--- > > RIP: 0010:__list_del_entry_valid.cold.1+0x48/0x4a lib/list_debug.c:51 > > Code: fe 60 88 e8 72 9b d3 fd 0f 0b 48 89 de 48 c7 c7 40 00 61 88 e8 61 9b > > d3 fd 0f 0b 48 89 de 48 c7 c7 e0 ff 60 88 e8 50 9b d3 fd <0f> 0b 48 89 d9 48 > > c7 c7 a0 00 61 88 e8 3f 9b d3 fd 0f 0b 48 89 f1 > > RSP: 0018:ffff8801c135f750 EFLAGS: 00010286 > > RAX: 0000000000000054 RBX: ffff8801c135f960 RCX: 0000000000000000 > > RDX: 0000000000000000 RSI: ffffffff8165ba15 RDI: 0000000000000005 > > RBP: ffff8801c135f768 R08: ffff8801c11ce080 R09: ffffed003b5e5020 > > R10: ffffed003b5e5020 R11: ffff8801daf28107 R12: ffff8801d945f3a0 > > R13: ffff8801d945f3a0 R14: 0000000000000000 R15: ffff8801c135f838 > > FS: 00007f96b449c700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 000000000046aa40 CR3: 00000001b39ab000 CR4: 00000000001406e0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > > > > --- > > This bug 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 syzkal...@googlegroups.com. > > > > syzbot will keep track of this bug report. See: > > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > > syzbot. > > syzbot can test patches for this bug, for details see: > > https://goo.gl/tpsmEJ#testing-patches > > > > -- > > You received this message because you are subscribed to the Google Groups > > "syzkaller-bugs" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to syzkaller-bugs+unsubscr...@googlegroups.com. > > To view this discussion on the web visit > > https://groups.google.com/d/msgid/syzkaller-bugs/000000000000fa9fb7057a679a42%40google.com. > > For more options, visit https://groups.google.com/d/optout. -- Jeff Layton <jlay...@kernel.org>
