syzbot


KMSAN: uninit-value in udp_tunnel6_xmit_skb (2)

Status: closed as invalid on 2021/10/06 02:59
Subsystems: net
[Documentation on labels]
First crash: 1303d, last: 1107d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in udp_tunnel6_xmit_skb net 7 1455d 1519d 0/26 auto-closed as invalid on 2020/07/31 18:43

Sample crash report:
batman_adv: batadv0: Interface activated: batadv_slave_1
=====================================================
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:60 [inline]
BUG: KMSAN: uninit-value in ip6_flow_hdr include/net/ipv6.h:941 [inline]
BUG: KMSAN: uninit-value in udp_tunnel6_xmit_skb+0xc69/0xf80 net/ipv6/ip6_udp_tunnel.c:102
CPU: 0 PID: 8480 Comm: syz-executor595 Not tainted 5.8.0-rc5-syzkaller #0
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+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline]
 __fswab32 include/uapi/linux/swab.h:60 [inline]
 ip6_flow_hdr include/net/ipv6.h:941 [inline]
 udp_tunnel6_xmit_skb+0xc69/0xf80 net/ipv6/ip6_udp_tunnel.c:102
 geneve6_xmit_skb drivers/net/geneve.c:973 [inline]
 geneve_xmit+0x2b5d/0x3200 drivers/net/geneve.c:1002
 __netdev_start_xmit include/linux/netdevice.h:4611 [inline]
 netdev_start_xmit include/linux/netdevice.h:4625 [inline]
 xmit_one+0x3cf/0x750 net/core/dev.c:3556
 dev_hard_start_xmit net/core/dev.c:3572 [inline]
 __dev_queue_xmit+0x3aad/0x4470 net/core/dev.c:4131
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4164
 packet_snd net/packet/af_packet.c:2979 [inline]
 packet_sendmsg+0x8542/0x9a80 net/packet/af_packet.c:3004
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0xc82/0x1240 net/socket.c:2352
 ___sys_sendmsg net/socket.c:2406 [inline]
 __sys_sendmmsg+0xa05/0xf70 net/socket.c:2496
 __do_sys_sendmmsg net/socket.c:2525 [inline]
 __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2522
 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2522
 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x443b29
Code: Bad RIP value.
RSP: 002b:00007ffcf351d578 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443b29
RDX: 0000000000000001 RSI: 00000000200002c0 RDI: 0000000000000004
RBP: 00007ffcf351d590 R08: 00000000bb1414ac R09: 00000000bb1414ac
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcf351d5c0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127
 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80
 slab_alloc_node mm/slub.c:2839 [inline]
 __kmalloc_node_track_caller+0xeab/0x12e0 mm/slub.c:4478
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x35f/0xb30 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1083 [inline]
 alloc_skb_with_frags+0x1f2/0xc10 net/core/skbuff.c:5770
 sock_alloc_send_pskb+0xc83/0xe50 net/core/sock.c:2356
 packet_alloc_skb net/packet/af_packet.c:2827 [inline]
 packet_snd net/packet/af_packet.c:2922 [inline]
 packet_sendmsg+0x6abb/0x9a80 net/packet/af_packet.c:3004
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0xc82/0x1240 net/socket.c:2352
 ___sys_sendmsg net/socket.c:2406 [inline]
 __sys_sendmmsg+0xa05/0xf70 net/socket.c:2496
 __do_sys_sendmmsg net/socket.c:2525 [inline]
 __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2522
 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2522
 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/09/03 23:29 https://github.com/google/kmsan.git master 3b3ea6028136 abf9ba4f .config console log report syz C ci-upstream-kmsan-gce
2020/09/02 18:24 https://github.com/google/kmsan.git master 3b3ea6028136 abf9ba4f .config console log report syz C ci-upstream-kmsan-gce
2021/03/17 12:52 https://github.com/google/kmsan.git master 29ad81a1074a fdb2bb2c .config console log report info ci-upstream-kmsan-gce KMSAN: uninit-value in udp_tunnel6_xmit_skb
2021/02/09 03:45 https://github.com/google/kmsan.git master 73d62e81b476 2bd9619f .config console log report info ci-upstream-kmsan-gce KMSAN: uninit-value in udp_tunnel6_xmit_skb
2021/02/07 05:45 https://github.com/google/kmsan.git master 73d62e81b476 0655e081 .config console log report info ci-upstream-kmsan-gce KMSAN: uninit-value in udp_tunnel6_xmit_skb
2021/02/08 05:02 https://github.com/google/kmsan.git master 73d62e81b476 2ce644fc .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in udp_tunnel6_xmit_skb
2021/01/14 19:27 https://github.com/google/kmsan.git master 73d62e81b476 65a7a854 .config console log report info ci-upstream-kmsan-gce
2020/10/08 10:59 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/10/06 07:20 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info ci-upstream-kmsan-gce
2020/09/11 15:23 https://github.com/google/kmsan.git master 3b3ea6028136 adfb8b4e .config console log report ci-upstream-kmsan-gce
2020/09/07 19:37 https://github.com/google/kmsan.git master 3b3ea6028136 abf9ba4f .config console log report ci-upstream-kmsan-gce
2020/09/02 13:59 https://github.com/google/kmsan.git master 3b3ea6028136 abf9ba4f .config console log report ci-upstream-kmsan-gce
2020/10/16 17:48 https://github.com/google/kmsan.git master e67f4ba870c2 6e262c73 .config console log report info ci-upstream-kmsan-gce-386
2020/09/07 18:17 https://github.com/google/kmsan.git master 3b3ea6028136 abf9ba4f .config console log report ci-upstream-kmsan-gce-386
2020/09/01 13:29 https://github.com/google/kmsan.git master 3b3ea6028136 d5a3ae1f .config console log report ci-upstream-kmsan-gce-386
* Struck through repros no longer work on HEAD.