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KMSAN: uninit-value in __neigh_create

Status: auto-closed as invalid on 2019/07/09 06:36
Subsystems: net
[Documentation on labels]
First crash: 1961d, last: 1925d

Sample crash report:
==================================================================
BUG: KMSAN: uninit-value in __neigh_create+0x2249/0x2680 net/core/neighbour.c:563
CPU: 0 PID: 26263 Comm: syz-executor2 Not tainted 4.20.0-rc7+ #5
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+0x173/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:613
 __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
 __neigh_create+0x2249/0x2680 net/core/neighbour.c:563
 ip_finish_output2+0xa0f/0x1830 net/ipv4/ip_output.c:224
 ip_finish_output+0xd2d/0xfd0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_output+0x53f/0x610 net/ipv4/ip_output.c:405
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0x164/0x1d0 net/ipv4/ip_output.c:124
 iptunnel_xmit+0x8d1/0xe00 net/ipv4/ip_tunnel_core.c:91
 ip_tunnel_xmit+0x37ad/0x3b70 net/ipv4/ip_tunnel.c:787
 __gre_xmit net/ipv4/ip_gre.c:451 [inline]
 ipgre_xmit+0xdc7/0xea0 net/ipv4/ip_gre.c:705
 __netdev_start_xmit include/linux/netdevice.h:4356 [inline]
 netdev_start_xmit include/linux/netdevice.h:4365 [inline]
 xmit_one net/core/dev.c:3257 [inline]
 dev_hard_start_xmit+0x607/0xc40 net/core/dev.c:3273
 __dev_queue_xmit+0x2e42/0x3bc0 net/core/dev.c:3843
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3876
 packet_snd net/packet/af_packet.c:2928 [inline]
 packet_sendmsg+0x8306/0x8f30 net/packet/af_packet.c:2953
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2116
 __sys_sendmsg net/socket.c:2154 [inline]
 __do_sys_sendmsg net/socket.c:2163 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2161
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
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:00007fd828df0c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd828df16d4
R13: 00000000004c52f9 R14: 00000000004d8d58 R15: 00000000ffffffff

Uninit was created at:
No stack
==================================================================

Crashes (68):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/01/10 06:29 https://github.com/google/kmsan.git master a6846a32c96d 45c0c1b1 .config console log report ci-upstream-kmsan-gce
2019/01/10 05:21 https://github.com/google/kmsan.git master a6846a32c96d 45c0c1b1 .config console log report ci-upstream-kmsan-gce
2019/01/09 16:48 https://github.com/google/kmsan.git master 48128c3ca084 45c0c1b1 .config console log report ci-upstream-kmsan-gce
2019/01/08 23:21 https://github.com/google/kmsan.git master 48128c3ca084 010ed08b .config console log report ci-upstream-kmsan-gce
2019/01/08 20:47 https://github.com/google/kmsan.git master 48128c3ca084 010ed08b .config console log report ci-upstream-kmsan-gce
2019/01/08 08:39 https://github.com/google/kmsan.git master 48128c3ca084 37dd2683 .config console log report ci-upstream-kmsan-gce
2019/01/07 13:45 https://github.com/google/kmsan.git master 48128c3ca084 69d69aa9 .config console log report ci-upstream-kmsan-gce
2019/01/07 02:08 https://github.com/google/kmsan.git master 11587f6ee534 ee332608 .config console log report ci-upstream-kmsan-gce
2019/01/05 06:55 https://github.com/google/kmsan.git master 11587f6ee534 53be0a37 .config console log report ci-upstream-kmsan-gce
2019/01/05 01:29 https://github.com/google/kmsan.git master 11587f6ee534 0127e3ba .config console log report ci-upstream-kmsan-gce
2019/01/04 15:42 https://github.com/google/kmsan.git master 11587f6ee534 0127e3ba .config console log report ci-upstream-kmsan-gce
2019/01/04 03:13 https://github.com/google/kmsan.git master 68006459ade0 7da23925 .config console log report ci-upstream-kmsan-gce
2019/01/03 13:07 https://github.com/google/kmsan.git master 8ba10281f9e5 66fcd29b .config console log report ci-upstream-kmsan-gce
2019/01/03 03:45 https://github.com/google/kmsan.git master 8ba10281f9e5 06a2b89f .config console log report ci-upstream-kmsan-gce
2019/01/03 01:59 https://github.com/google/kmsan.git master 8ba10281f9e5 06a2b89f .config console log report ci-upstream-kmsan-gce
2019/01/02 13:30 https://github.com/google/kmsan.git master 8ba10281f9e5 f0491811 .config console log report ci-upstream-kmsan-gce
2019/01/01 21:19 https://github.com/google/kmsan.git master 8ba10281f9e5 3d85f48c .config console log report ci-upstream-kmsan-gce
2019/01/01 16:06 https://github.com/google/kmsan.git master 8ba10281f9e5 3d85f48c .config console log report ci-upstream-kmsan-gce
2018/12/31 19:31 https://github.com/google/kmsan.git master 8ba10281f9e5 2b42fdc8 .config console log report ci-upstream-kmsan-gce
2018/12/31 12:46 https://github.com/google/kmsan.git master 8ba10281f9e5 2b42fdc8 .config console log report ci-upstream-kmsan-gce
2018/12/31 01:18 https://github.com/google/kmsan.git master 8ba10281f9e5 2b42fdc8 .config console log report ci-upstream-kmsan-gce
2018/12/30 18:14 https://github.com/google/kmsan.git master 8ba10281f9e5 9942de5f .config console log report ci-upstream-kmsan-gce
2018/12/30 16:08 https://github.com/google/kmsan.git master 8ba10281f9e5 9942de5f .config console log report ci-upstream-kmsan-gce
2018/12/30 16:04 https://github.com/google/kmsan.git master 8ba10281f9e5 9942de5f .config console log report ci-upstream-kmsan-gce
2018/12/30 15:19 https://github.com/google/kmsan.git master 8ba10281f9e5 9942de5f .config console log report ci-upstream-kmsan-gce
2018/12/29 12:13 https://github.com/google/kmsan.git master 79fc24ff6184 a40793d7 .config console log report ci-upstream-kmsan-gce
2018/12/29 10:07 https://github.com/google/kmsan.git master 79fc24ff6184 e33ad0f1 .config console log report ci-upstream-kmsan-gce
2018/12/29 02:54 https://github.com/google/kmsan.git master 79fc24ff6184 e33ad0f1 .config console log report ci-upstream-kmsan-gce
2018/12/28 23:52 https://github.com/google/kmsan.git master 79fc24ff6184 e33ad0f1 .config console log report ci-upstream-kmsan-gce
2018/12/24 09:13 https://github.com/google/kmsan.git master 75b3ad224f19 be79df56 .config console log report ci-upstream-kmsan-gce
2018/12/24 07:12 https://github.com/google/kmsan.git master 75b3ad224f19 be79df56 .config console log report ci-upstream-kmsan-gce
2018/12/22 14:02 https://github.com/google/kmsan.git master 75b3ad224f19 e3bd7ab8 .config console log report ci-upstream-kmsan-gce
2018/12/22 09:16 https://github.com/google/kmsan.git master 75b3ad224f19 603b5124 .config console log report ci-upstream-kmsan-gce
2018/12/21 15:58 https://github.com/google/kmsan.git master 52848d85e630 588075e6 .config console log report ci-upstream-kmsan-gce
2018/12/21 03:21 https://github.com/google/kmsan.git master 52848d85e630 2b497001 .config console log report ci-upstream-kmsan-gce
2018/12/21 03:20 https://github.com/google/kmsan.git master 52848d85e630 2b497001 .config console log report ci-upstream-kmsan-gce
2018/12/19 11:55 https://github.com/google/kmsan.git master 49d30e29c6d8 fe2dc057 .config console log report ci-upstream-kmsan-gce
2018/12/19 11:53 https://github.com/google/kmsan.git master 49d30e29c6d8 fe2dc057 .config console log report ci-upstream-kmsan-gce
2018/12/18 14:52 https://github.com/google/kmsan.git master 49d30e29c6d8 4edaba93 .config console log report ci-upstream-kmsan-gce
2018/12/18 14:52 https://github.com/google/kmsan.git master 49d30e29c6d8 4edaba93 .config console log report ci-upstream-kmsan-gce
2018/12/18 06:32 https://github.com/google/kmsan.git master 0a602458c72c def91db3 .config console log report ci-upstream-kmsan-gce
2018/12/18 01:28 https://github.com/google/kmsan.git master 0a602458c72c def91db3 .config console log report ci-upstream-kmsan-gce
2018/12/16 03:14 https://github.com/google/kmsan.git master 0a602458c72c def91db3 .config console log report ci-upstream-kmsan-gce
2018/12/16 01:51 https://github.com/google/kmsan.git master 0a602458c72c def91db3 .config console log report ci-upstream-kmsan-gce
2018/12/15 21:05 https://github.com/google/kmsan.git master 0a602458c72c def91db3 .config console log report ci-upstream-kmsan-gce
2018/12/15 06:32 https://github.com/google/kmsan.git master 0a602458c72c 7624ddd6 .config console log report ci-upstream-kmsan-gce
2018/12/13 23:58 https://github.com/google/kmsan.git master 0a602458c72c fe7127be .config console log report ci-upstream-kmsan-gce
2018/12/13 13:07 https://github.com/google/kmsan.git master ca749062e9f6 f3d9d594 .config console log report ci-upstream-kmsan-gce
2018/12/13 10:37 https://github.com/google/kmsan.git master 42db043be545 f3d9d594 .config console log report ci-upstream-kmsan-gce
2018/12/13 04:21 https://github.com/google/kmsan.git master 42db043be545 02613a41 .config console log report ci-upstream-kmsan-gce
2018/12/11 20:37 https://github.com/google/kmsan.git master 3f06bda61398 7795ae03 .config console log report ci-upstream-kmsan-gce
2018/12/11 20:29 https://github.com/google/kmsan.git master 3f06bda61398 7795ae03 .config console log report ci-upstream-kmsan-gce
2018/12/10 20:26 https://github.com/google/kmsan.git master 3f06bda61398 6565f24d .config console log report ci-upstream-kmsan-gce
2018/12/10 00:40 https://github.com/google/kmsan.git master 3f06bda61398 96cc4c50 .config console log report ci-upstream-kmsan-gce
2018/12/09 22:09 https://github.com/google/kmsan.git master 3f06bda61398 979179d6 .config console log report ci-upstream-kmsan-gce
2018/12/08 21:35 https://github.com/google/kmsan.git master 3f06bda61398 60562a1d .config console log report ci-upstream-kmsan-gce
2018/12/08 11:57 https://github.com/google/kmsan.git master 3f06bda61398 60562a1d .config console log report ci-upstream-kmsan-gce
2018/12/08 11:17 https://github.com/google/kmsan.git master 3f06bda61398 60562a1d .config console log report ci-upstream-kmsan-gce
2018/12/08 01:09 https://github.com/google/kmsan.git master 3f06bda61398 65ed2472 .config console log report ci-upstream-kmsan-gce
2018/12/08 01:01 https://github.com/google/kmsan.git master 3f06bda61398 65ed2472 .config console log report ci-upstream-kmsan-gce
2018/12/08 00:52 https://github.com/google/kmsan.git master 3f06bda61398 65ed2472 .config console log report ci-upstream-kmsan-gce
2018/12/08 00:48 https://github.com/google/kmsan.git master 3f06bda61398 65ed2472 .config console log report ci-upstream-kmsan-gce
2018/12/05 00:31 https://github.com/google/kmsan.git master 00f99f811392 f162ad97 .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.