On Sun, Nov 11, 2018 at 10:18 AM, syzbot <syzbot+13eb7470890c56ce3f37@xxxxxxxxxxxxxxxxxxxxxxxxx> 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+13eb7470890c56ce3f37@xxxxxxxxxxxxxxxxxxxxxxxxx This is another manifestation of the following report, right? #syz dup: KASAN: use-after-free Read in locks_delete_block > 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 syzkaller@xxxxxxxxxxxxxxxx. > > 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+unsubscribe@xxxxxxxxxxxxxxxx. > 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.
