On Mon, Jan 14, 2019 at 7:52 AM syzbot <syzbot+8433ca0841e308ef4...@syzkaller.appspotmail.com> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: b71acb0e3721 Merge branch 'linus' of git://git.kernel.org/.. > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1492759f400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=b03c5892bb940c76 > dashboard link: https://syzkaller.appspot.com/bug?extid=8433ca0841e308ef4cc7 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+8433ca0841e308ef4...@syzkaller.appspotmail.com
+Wei > kernel msg: ebtables bug: please report to author: EBT_ENTRY_OR_ENTRIES > shouldn't be set in distinguisher > ================================================================== > BUG: KASAN: null-ptr-deref in atomic_read > include/asm-generic/atomic-instrumented.h:21 [inline] > BUG: KASAN: null-ptr-deref in atomic_fetch_add_unless > include/linux/atomic.h:575 [inline] > BUG: KASAN: null-ptr-deref in atomic_add_unless include/linux/atomic.h:597 > [inline] > BUG: KASAN: null-ptr-deref in dst_hold_safe include/net/dst.h:308 [inline] > BUG: KASAN: null-ptr-deref in ip6_hold_safe+0xca/0x620 net/ipv6/route.c:1021 > Read of size 4 at addr 0000000000000068 by task syz-executor4/21421 > > CPU: 0 PID: 21421 Comm: syz-executor4 Not tainted 4.20.0+ #3 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 > kasan_report_error mm/kasan/report.c:352 [inline] > kasan_report mm/kasan/report.c:412 [inline] > kasan_report.cold+0x19f/0x2ba mm/kasan/report.c:396 > check_memory_region_inline mm/kasan/kasan.c:260 [inline] > check_memory_region+0x123/0x190 mm/kasan/kasan.c:267 > kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272 > atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] > atomic_fetch_add_unless include/linux/atomic.h:575 [inline] > atomic_add_unless include/linux/atomic.h:597 [inline] > dst_hold_safe include/net/dst.h:308 [inline] > ip6_hold_safe+0xca/0x620 net/ipv6/route.c:1021 > rt6_get_pcpu_route net/ipv6/route.c:1241 [inline] > ip6_pol_route+0x3a3/0x1490 net/ipv6/route.c:1890 > ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2066 > fib6_rule_lookup+0x277/0x870 net/ipv6/fib6_rules.c:122 > ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2095 > ip6_route_output include/net/ip6_route.h:88 [inline] > ip6_dst_lookup_tail+0xe18/0x1d50 net/ipv6/ip6_output.c:958 > ip6_dst_lookup_flow+0xca/0x270 net/ipv6/ip6_output.c:1086 > ip6_sk_dst_lookup_flow net/ipv6/ip6_output.c:1124 [inline] > ip6_sk_dst_lookup_flow+0x5d6/0xbf0 net/ipv6/ip6_output.c:1114 > udpv6_sendmsg+0x20d7/0x3550 net/ipv6/udp.c:1441 > inet_sendmsg+0x1af/0x740 net/ipv4/af_inet.c:798 > sock_sendmsg_nosec net/socket.c:621 [inline] > sock_sendmsg+0xdd/0x130 net/socket.c:631 > ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116 > __sys_sendmsg+0x112/0x270 net/socket.c:2154 > __do_sys_sendmsg net/socket.c:2163 [inline] > __se_sys_sendmsg net/socket.c:2161 [inline] > __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 > protocol 88fb is buggy, dev hsr_slave_0 > do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 > protocol 88fb is buggy, dev hsr_slave_1 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x457ec9 > Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007fb05ac4ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 > RDX: 0000000000000000 RSI: 0000000020013000 RDI: 0000000000000004 > RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb05ac4b6d4 > R13: 00000000004c4d2e R14: 00000000004d8650 R15: 00000000ffffffff > ================================================================== > > > --- > 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. > > -- > 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/00000000000075c0ef057f657b8d%40google.com. > For more options, visit https://groups.google.com/d/optout.
