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KMSAN: uninit-value in csum_partial

Status: closed as invalid on 2018/05/14 09:33
Subsystems: kernel
[Documentation on labels]
First crash: 2704d, last: 2690d

Sample crash report:
==================================================================
BUG: KMSAN: uninit-value in add32_with_carry arch/x86/include/asm/checksum_64.h:185 [inline]
BUG: KMSAN: uninit-value in do_csum arch/x86/lib/csum-partial_64.c:114 [inline]
BUG: KMSAN: uninit-value in csum_partial+0x78e/0x850 arch/x86/lib/csum-partial_64.c:136
CPU: 0 PID: 3577 Comm: syzkaller295237 Not tainted 4.16.0+ #84
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:676
 add32_with_carry arch/x86/include/asm/checksum_64.h:185 [inline]
 do_csum arch/x86/lib/csum-partial_64.c:114 [inline]
 csum_partial+0x78e/0x850 arch/x86/lib/csum-partial_64.c:136
 csum_partial_ext+0x89/0xa0 include/net/checksum.h:118
 __skb_checksum+0x6d4/0x1010 net/core/skbuff.c:2498
 skb_checksum+0xec/0x120 net/core/skbuff.c:2545
 __skb_checksum_complete+0x90/0x400 net/core/datagram.c:752
 __skb_checksum_validate_complete include/linux/skbuff.h:3698 [inline]
 udp6_csum_init+0x94f/0x10c0 net/ipv6/ip6_checksum.c:91
 __udp6_lib_rcv+0x534/0x3920 net/ipv6/udp.c:792
 udpv6_rcv+0x5c/0x70 net/ipv6/udp.c:941
 ip6_input_finish+0xa62/0x2110 net/ipv6/ip6_input.c:284
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip6_input+0x294/0x320 net/ipv6/ip6_input.c:327
 dst_input include/net/dst.h:449 [inline]
 ip6_rcv_finish net/ipv6/ip6_input.c:71 [inline]
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ipv6_rcv+0x20ec/0x26d0 net/ipv6/ip6_input.c:208
 __netif_receive_skb_core+0x47cf/0x4a80 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]
 ip6_finish_output2+0x1b6c/0x1f20 net/ipv6/ip6_output.c:121
 ip6_finish_output+0xb3f/0xc00 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip6_output+0x597/0x6c0 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:443 [inline]
 ip6_local_out+0x573/0x640 net/ipv6/output_core.c:176
 ip6_send_skb+0xfa/0x380 net/ipv6/ip6_output.c:1682
 udp_v6_send_skb+0x116a/0x1880 net/ipv6/udp.c:1044
 udp_v6_push_pending_frames net/ipv6/udp.c:1077 [inline]
 udpv6_sendmsg+0x15f4/0x45b0 net/ipv6/udp.c:1343
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 SYSC_sendto+0x6c3/0x7e0 net/socket.c:1747
 SyS_sendto+0x8a/0xb0 net/socket.c:1715
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x440109
RSP: 002b:00007fff024406f8 EFLAGS: 00000212 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440109
RDX: 0000000000000043 RSI: 0000000020000480 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000020000380 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000401a30
R13: 0000000000401ac0 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_alloc_meta_for_pages+0x161/0x3a0 mm/kmsan/kmsan.c:814
 kmsan_alloc_page+0x82/0xe0 mm/kmsan/kmsan.c:868
 __alloc_pages_nodemask+0xf5b/0x5dc0 mm/page_alloc.c:4283
 alloc_pages_current+0x6b5/0x970 mm/mempolicy.c:2055
 alloc_pages include/linux/gfp.h:494 [inline]
 skb_page_frag_refill+0x3ba/0x5e0 net/core/sock.c:2208
 sk_page_frag_refill+0xa4/0x340 net/core/sock.c:2228
 __ip6_append_data+0x1a20/0x4bb0 net/ipv6/ip6_output.c:1503
 ip6_append_data+0x40e/0x6b0 net/ipv6/ip6_output.c:1576
 udpv6_sendmsg+0xfd5/0x45b0 net/ipv6/udp.c:1337
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 SYSC_sendto+0x6c3/0x7e0 net/socket.c:1747
 SyS_sendto+0x8a/0xb0 net/socket.c:1715
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
==================================================================

Crashes (554):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/04/20 22:40 https://github.com/google/kmsan.git master 48c6a2b0ab1b cc402841 .config console log report syz C ci-upstream-kmsan-gce
2018/04/20 18:20 https://github.com/google/kmsan.git master 48c6a2b0ab1b cc402841 .config console log report syz C ci-upstream-kmsan-gce
2018/04/18 17:18 https://github.com/google/kmsan.git master 48c6a2b0ab1b 52643b44 .config console log report syz C ci-upstream-kmsan-gce
2018/04/16 16:05 https://github.com/google/kmsan.git master 48c6a2b0ab1b 802ac912 .config console log report syz C ci-upstream-kmsan-gce
2018/04/16 12:46 https://github.com/google/kmsan.git master 48c6a2b0ab1b 802ac912 .config console log report syz C ci-upstream-kmsan-gce
2018/04/14 17:32 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report syz C ci-upstream-kmsan-gce
2018/04/14 09:47 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report syz C ci-upstream-kmsan-gce
2018/04/13 17:38 https://github.com/google/kmsan.git master 35ff515e4bda 0a0c5db6 .config console log report syz C ci-upstream-kmsan-gce
2018/04/13 13:35 https://github.com/google/kmsan.git master 35ff515e4bda 0a0c5db6 .config console log report syz C ci-upstream-kmsan-gce
2018/04/12 13:36 https://github.com/google/kmsan.git master 35ff515e4bda 9cd56d71 .config console log report syz C ci-upstream-kmsan-gce
2018/04/11 23:14 https://github.com/google/kmsan.git master 35ff515e4bda 9cd56d71 .config console log report syz C ci-upstream-kmsan-gce
2018/04/11 22:32 https://github.com/google/kmsan.git master 35ff515e4bda 9cd56d71 .config console log report syz C ci-upstream-kmsan-gce
2018/04/11 14:35 https://github.com/google/kmsan.git master 35ff515e4bda 8b8de427 .config console log report syz C ci-upstream-kmsan-gce
2018/04/11 12:47 https://github.com/google/kmsan.git master 35ff515e4bda 8b8de427 .config console log report syz C ci-upstream-kmsan-gce
2018/04/08 06:57 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report syz C ci-upstream-kmsan-gce
2018/04/07 22:57 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report syz C ci-upstream-kmsan-gce
2018/04/07 22:32 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report syz C ci-upstream-kmsan-gce
2018/04/07 17:20 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report syz C ci-upstream-kmsan-gce
2018/04/21 13:54 https://github.com/google/kmsan.git master 48c6a2b0ab1b d23fcf6c .config console log report ci-upstream-kmsan-gce
2018/04/21 12:10 https://github.com/google/kmsan.git master 48c6a2b0ab1b ca03d688 .config console log report ci-upstream-kmsan-gce
2018/04/21 08:36 https://github.com/google/kmsan.git master 48c6a2b0ab1b ca03d688 .config console log report ci-upstream-kmsan-gce
2018/04/21 06:34 https://github.com/google/kmsan.git master 48c6a2b0ab1b ca03d688 .config console log report ci-upstream-kmsan-gce
2018/04/21 04:28 https://github.com/google/kmsan.git master 48c6a2b0ab1b ca03d688 .config console log report ci-upstream-kmsan-gce
2018/04/21 01:48 https://github.com/google/kmsan.git master 48c6a2b0ab1b ca03d688 .config console log report ci-upstream-kmsan-gce
2018/04/20 20:30 https://github.com/google/kmsan.git master 48c6a2b0ab1b cc402841 .config console log report ci-upstream-kmsan-gce
2018/04/20 15:57 https://github.com/google/kmsan.git master 48c6a2b0ab1b cc402841 .config console log report ci-upstream-kmsan-gce
2018/04/20 13:14 https://github.com/google/kmsan.git master 48c6a2b0ab1b cc402841 .config console log report ci-upstream-kmsan-gce
2018/04/20 10:22 https://github.com/google/kmsan.git master 48c6a2b0ab1b eae05cb0 .config console log report ci-upstream-kmsan-gce
2018/04/20 06:59 https://github.com/google/kmsan.git master 48c6a2b0ab1b eae05cb0 .config console log report ci-upstream-kmsan-gce
2018/04/20 01:19 https://github.com/google/kmsan.git master 48c6a2b0ab1b eae05cb0 .config console log report ci-upstream-kmsan-gce
2018/04/19 19:35 https://github.com/google/kmsan.git master 48c6a2b0ab1b 3642839c .config console log report ci-upstream-kmsan-gce
2018/04/19 18:29 https://github.com/google/kmsan.git master 48c6a2b0ab1b 3642839c .config console log report ci-upstream-kmsan-gce
2018/04/19 17:03 https://github.com/google/kmsan.git master 48c6a2b0ab1b 3642839c .config console log report ci-upstream-kmsan-gce
2018/04/19 15:31 https://github.com/google/kmsan.git master 48c6a2b0ab1b 3642839c .config console log report ci-upstream-kmsan-gce
2018/04/19 13:03 https://github.com/google/kmsan.git master 48c6a2b0ab1b 3642839c .config console log report ci-upstream-kmsan-gce
2018/04/19 11:16 https://github.com/google/kmsan.git master 48c6a2b0ab1b d1b2ef69 .config console log report ci-upstream-kmsan-gce
2018/04/19 08:20 https://github.com/google/kmsan.git master 48c6a2b0ab1b d1b2ef69 .config console log report ci-upstream-kmsan-gce
2018/04/19 05:59 https://github.com/google/kmsan.git master 48c6a2b0ab1b 829f0234 .config console log report ci-upstream-kmsan-gce
2018/04/19 04:31 https://github.com/google/kmsan.git master 48c6a2b0ab1b 829f0234 .config console log report ci-upstream-kmsan-gce
2018/04/19 01:54 https://github.com/google/kmsan.git master 48c6a2b0ab1b 829f0234 .config console log report ci-upstream-kmsan-gce
2018/04/19 00:28 https://github.com/google/kmsan.git master 48c6a2b0ab1b 829f0234 .config console log report ci-upstream-kmsan-gce
2018/04/18 08:23 https://github.com/google/kmsan.git master 48c6a2b0ab1b 52643b44 .config console log report ci-upstream-kmsan-gce
2018/04/18 04:36 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/17 23:10 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/17 21:34 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/17 17:23 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/17 14:49 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/17 11:17 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/17 09:35 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/17 07:07 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/17 04:45 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/17 02:51 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/16 22:57 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/16 18:44 https://github.com/google/kmsan.git master 48c6a2b0ab1b 802ac912 .config console log report ci-upstream-kmsan-gce
2018/04/16 13:56 https://github.com/google/kmsan.git master 48c6a2b0ab1b 802ac912 .config console log report ci-upstream-kmsan-gce
2018/04/16 10:54 https://github.com/google/kmsan.git master 48c6a2b0ab1b 802ac912 .config console log report ci-upstream-kmsan-gce
2018/04/16 05:41 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/16 02:51 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/16 00:43 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/15 23:37 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/15 19:34 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/15 18:13 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/15 17:12 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/15 14:06 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/15 10:24 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/06 23:09 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.