syzbot

 sign-in | mailing list | source | docs
🐞 Open [978] ≡ Subsystems 🐞 Fixed [5216] 🐞 Invalid [12473] ⬇ Missing Backports [82] 📈 Kernel Health 📈 Bug Lifetimes 📈 Fuzzing 📈 Crashes 💬 Send us feedback

KMSAN: uninit-value in gre_rcv

Status: closed as invalid on 2018/07/11 17:18
Subsystems: net
[Documentation on labels]
First crash: 2187d, last: 2145d
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in gre_rcv (3) net C 3 20d 21d 23/26 upstream: reported C repro on 2024/03/28 11:00
upstream KMSAN: uninit-value in gre_rcv (2) net C 146 1871d 2031d 0/26 auto-obsoleted due to no activity on 2022/12/09 20:09

Sample crash report:
IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
8021q: adding VLAN 0 to HW filter on device team0
==================================================================
BUG: KMSAN: uninit-value in __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline]
BUG: KMSAN: uninit-value in __fswab32 include/uapi/linux/swab.h:59 [inline]
BUG: KMSAN: uninit-value in erspan_rcv net/ipv4/ip_gre.c:282 [inline]
BUG: KMSAN: uninit-value in gre_rcv+0x1241/0x1980 net/ipv4/ip_gre.c:420
CPU: 0 PID: 4508 Comm: syz-executor457 Not tainted 4.16.0+ #87
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
 __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline]
 __fswab32 include/uapi/linux/swab.h:59 [inline]
 erspan_rcv net/ipv4/ip_gre.c:282 [inline]
 gre_rcv+0x1241/0x1980 net/ipv4/ip_gre.c:420
 gre_rcv+0x2dc/0x3b0 net/ipv4/gre_demux.c:142
 ip_local_deliver_finish+0x874/0xec0 net/ipv4/ip_input.c:216
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip_local_deliver+0x43c/0x4e0 net/ipv4/ip_input.c:257
 dst_input include/net/dst.h:449 [inline]
 ip_rcv_finish+0xa36/0x1d00 net/ipv4/ip_input.c:397
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip_rcv+0x118f/0x16d0 net/ipv4/ip_input.c:493
 __netif_receive_skb_core+0x47df/0x4a90 net/core/dev.c:4562
 __netif_receive_skb net/core/dev.c:4627 [inline]
 process_backlog+0x62d/0xe20 net/core/dev.c:5307
 napi_poll net/core/dev.c:5705 [inline]
 net_rx_action+0x7c1/0x1a70 net/core/dev.c:5771
 __do_softirq+0x56d/0x93d kernel/softirq.c:285
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1040
 </IRQ>
 do_softirq kernel/softirq.c:329 [inline]
 __local_bh_enable_ip+0x114/0x140 kernel/softirq.c:182
 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:726 [inline]
 ip_finish_output2+0x135a/0x1470 net/ipv4/ip_output.c:231
 ip_finish_output+0xcb2/0xff0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip_mc_output+0x1029/0x15e0 net/ipv4/ip_output.c:390
 dst_output include/net/dst.h:443 [inline]
 ip_local_out net/ipv4/ip_output.c:124 [inline]
 ip_queue_xmit+0x1a1e/0x1d10 net/ipv4/ip_output.c:504
 sctp_v4_xmit+0x188/0x210 net/sctp/protocol.c:992
 sctp_packet_transmit+0x3e1b/0x42c0 net/sctp/output.c:638
 sctp_outq_flush+0x11e6/0x6320 net/sctp/outqueue.c:911
 sctp_outq_uncork+0xd2/0xf0 net/sctp/outqueue.c:776
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1807 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1210 [inline]
 sctp_do_sm+0x860f/0x8c20 net/sctp/sm_sideeffect.c:1181
 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:88
 __sctp_connect+0x1633/0x1ae0 net/sctp/socket.c:1235
 sctp_connect+0x1b0/0x200 net/sctp/socket.c:4307
 inet_dgram_connect+0x2e8/0x4d0 net/ipv4/af_inet.c:542
 SYSC_connect+0x41a/0x510 net/socket.c:1639
 SyS_connect+0x54/0x80 net/socket.c:1620
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x441a29
RSP: 002b:00007ffeada3d8b8 EFLAGS: 00000217 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441a29
RDX: 000000000000001c RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00000000006cd018 R08: 00007ffe0000474d R09: 00007ffe0000474d
R10: 0000000000000010 R11: 0000000000000217 R12: 0000000000402720
R13: 00000000004027b0 R14: 0000000000000000 R15: 0000000000000000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
 kmsan_memcpy_origins+0x11d/0x170 mm/kmsan/kmsan.c:526
 __msan_memcpy+0x109/0x160 mm/kmsan/kmsan_instr.c:477
 pskb_expand_head+0x3a6/0x1a70 net/core/skbuff.c:1467
 __skb_cow include/linux/skbuff.h:2895 [inline]
 skb_cow_head include/linux/skbuff.h:2929 [inline]
 ip_tunnel_xmit+0x2dfe/0x37c0 net/ipv4/ip_tunnel.c:787
 __gre_xmit net/ipv4/ip_gre.c:449 [inline]
 erspan_xmit+0x1cc5/0x2ce0 net/ipv4/ip_gre.c:728
 __netdev_start_xmit include/linux/netdevice.h:4066 [inline]
 netdev_start_xmit include/linux/netdevice.h:4075 [inline]
 xmit_one net/core/dev.c:3026 [inline]
 dev_hard_start_xmit+0x5f1/0xc70 net/core/dev.c:3042
 sch_direct_xmit+0x540/0x8f0 net/sched/sch_generic.c:327
 qdisc_restart net/sched/sch_generic.c:399 [inline]
 __qdisc_run+0x1785/0x3730 net/sched/sch_generic.c:410
 __dev_xmit_skb net/core/dev.c:3217 [inline]
 __dev_queue_xmit+0x1d50/0x3520 net/core/dev.c:3525
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3590
 neigh_resolve_output+0xac6/0xb60 net/core/neighbour.c:1350
 neigh_output include/net/neighbour.h:482 [inline]
 ip_finish_output2+0x1344/0x1470 net/ipv4/ip_output.c:229
 ip_finish_output+0xcb2/0xff0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip_mc_output+0x1029/0x15e0 net/ipv4/ip_output.c:390
 dst_output include/net/dst.h:443 [inline]
 ip_local_out net/ipv4/ip_output.c:124 [inline]
 ip_queue_xmit+0x1a1e/0x1d10 net/ipv4/ip_output.c:504
 sctp_v4_xmit+0x188/0x210 net/sctp/protocol.c:992
 sctp_packet_transmit+0x3e1b/0x42c0 net/sctp/output.c:638
 sctp_outq_flush+0x11e6/0x6320 net/sctp/outqueue.c:911
 sctp_outq_uncork+0xd2/0xf0 net/sctp/outqueue.c:776
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1807 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1210 [inline]
 sctp_do_sm+0x860f/0x8c20 net/sctp/sm_sideeffect.c:1181
 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:88
 __sctp_connect+0x1633/0x1ae0 net/sctp/socket.c:1235
 sctp_connect+0x1b0/0x200 net/sctp/socket.c:4307
 inet_dgram_connect+0x2e8/0x4d0 net/ipv4/af_inet.c:542
 SYSC_connect+0x41a/0x510 net/socket.c:1639
 SyS_connect+0x54/0x80 net/socket.c:1620
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
 kmsan_slab_alloc+0x11/0x20 mm/kmsan/kmsan.c:321
 slab_post_alloc_hook mm/slab.h:445 [inline]
 slab_alloc_node mm/slub.c:2737 [inline]
 __kmalloc_node_track_caller+0xaed/0x11c0 mm/slub.c:4369
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2cf/0x9f0 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:984 [inline]
 sctp_packet_transmit+0x48a/0x42c0 net/sctp/output.c:581
 sctp_outq_flush+0x11e6/0x6320 net/sctp/outqueue.c:911
 sctp_outq_uncork+0xd2/0xf0 net/sctp/outqueue.c:776
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1807 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1210 [inline]
 sctp_do_sm+0x860f/0x8c20 net/sctp/sm_sideeffect.c:1181
 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:88
 __sctp_connect+0x1633/0x1ae0 net/sctp/socket.c:1235
 sctp_connect+0x1b0/0x200 net/sctp/socket.c:4307
 inet_dgram_connect+0x2e8/0x4d0 net/ipv4/af_inet.c:542
 SYSC_connect+0x41a/0x510 net/socket.c:1639
 SyS_connect+0x54/0x80 net/socket.c:1620
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
==================================================================

Crashes (168):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/04/27 09:22 https://github.com/google/kmsan.git master d2d741e5d189 73417389 .config console log report syz C ci-upstream-kmsan-gce
2018/04/24 00:06 https://github.com/google/kmsan.git master d2d741e5d189 0d8e591c .config console log report syz ci-upstream-kmsan-gce
2018/06/04 12:12 https://github.com/google/kmsan.git master 8fc8ecd1c58a 6cbe7c26 .config console log report ci-upstream-kmsan-gce
2018/06/01 02:27 https://github.com/google/kmsan.git master 8fc8ecd1c58a 2f93b54f .config console log report ci-upstream-kmsan-gce
2018/05/30 17:44 https://github.com/google/kmsan.git master 8fc8ecd1c58a 2f93b54f .config console log report ci-upstream-kmsan-gce
2018/05/30 00:56 https://github.com/google/kmsan.git master 1b9cd4eccac9 2f93b54f .config console log report ci-upstream-kmsan-gce
2018/05/29 18:51 https://github.com/google/kmsan.git master 1b9cd4eccac9 e276de77 .config console log report ci-upstream-kmsan-gce
2018/05/29 13:51 https://github.com/google/kmsan.git master 1b9cd4eccac9 e276de77 .config console log report ci-upstream-kmsan-gce
2018/05/29 09:52 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/29 03:41 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/29 01:37 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/28 23:50 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/28 19:20 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/28 18:04 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/28 14:41 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/28 13:19 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/28 11:32 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/28 09:56 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/28 07:55 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/28 05:32 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/28 04:29 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/28 01:47 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/27 22:53 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/27 21:22 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/27 18:52 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/27 17:34 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/27 15:37 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/27 14:25 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/27 12:41 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/27 09:01 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/27 07:04 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/27 05:36 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/27 04:10 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/27 01:57 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/26 23:24 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/26 20:07 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/26 16:58 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/26 13:41 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/26 12:25 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/26 07:12 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/26 04:11 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/26 02:42 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/25 23:37 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/25 22:14 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/25 15:09 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/25 13:36 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/25 07:25 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/25 04:33 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/25 02:20 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/24 20:46 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/24 18:34 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/24 17:07 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/24 13:10 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/24 11:15 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/24 09:41 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/24 07:00 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/24 05:14 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/05/24 03:22 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report ci-upstream-kmsan-gce
2018/04/23 21:08 https://github.com/google/kmsan.git master d2d741e5d189 0d8e591c .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.