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Date: Thu, 17 Feb 2022 08:30:47 -0500
From: Satadru Pramanik <satadru@...il.com>
To: Rich Felker <dalias@...ifal.cx>
Cc: musl@...ts.openwall.com
Subject: Re: Re: musl getaddr info breakage on older kernels
*This is a failure:*
tcpdump -i any -vvv host 192.168.0.115
tcpdump: listening on any, link-type LINUX_SLL (Linux cooked v1), capture
size 262144 bytes
08:29:38.043849 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP
(17), length 56)
192.168.0.115.60625 > office.lan.53: [udp sum ok] 0+ A? google.com. (28)
08:29:38.044237 IP (tos 0x0, ttl 64, id 11463, offset 0, flags [DF], proto
UDP (17), length 72)
office.lan.53 > 192.168.0.115.60625: [bad udp cksum 0x820a -> 0x5c7d!]
0 q: A? google.com. 1/0/0 google.com. [2m15s] A 142.250.80.110 (44)
08:29:38.047754 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP
(17), length 56)
192.168.0.115.60625 > office.lan.53: [udp sum ok] 0+ AAAA? google.com.
(28)
08:29:38.048078 IP (tos 0x0, ttl 64, id 11464, offset 0, flags [DF], proto
UDP (17), length 84)
office.lan.53 > 192.168.0.115.60625: [bad udp cksum 0x8216 -> 0xb42f!]
0 q: AAAA? google.com. 1/0/0 google.com. [4m26s] AAAA
2607:f8b0:4006:80d::200e (56)
08:29:38.048955 IP (tos 0xc0, ttl 64, id 59728, offset 0, flags [none],
proto ICMP (1), length 112)
192.168.0.115 > office.lan: ICMP 192.168.0.115 udp port 60625
unreachable, length 92
IP (tos 0x0, ttl 64, id 11464, offset 0, flags [DF], proto UDP
(17), length 84)
office.lan.53 > 192.168.0.115.60625: [udp sum ok] 0 q: AAAA? google.com.
1/0/0 google.com. [4m26s] AAAA 2607:f8b0:4006:80d::200e (56)
08:29:39.476101 IP (tos 0x0, ttl 64, id 12690, offset 0, flags [DF], proto
TCP (6), length 52)
192.168.0.115.51204 > lga34s35-in-f3.1e100.net.80: Flags [.], cksum
0xa666 (correct), seq 1466707759, ack 3358943837, win 115, options
[nop,nop,TS val 198422160 ecr 2351261566], length 0
08:29:39.478914 IP (tos 0x80, ttl 122, id 6227, offset 0, flags [none],
proto TCP (6), length 52)
lga34s35-in-f3.1e100.net.80 > 192.168.0.115.51204: Flags [.], cksum
0xa5b7 (correct), seq 1, ack 1, win 282, options [nop,nop,TS val 2351306585
ecr 198377148], length 0
^C
7 packets captured
7 packets received by filter
0 packets dropped by kernel
*Two successes and one failure:*
# tcpdump -i any -vvv host 192.168.0.115
tcpdump: listening on any, link-type LINUX_SLL (Linux cooked v1), capture
size 262144 bytes
08:28:16.906114 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP
(17), length 56)
192.168.0.115.34033 > office.lan.53: [udp sum ok] 0+ A? google.com. (28)
08:28:16.906243 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP
(17), length 56)
192.168.0.115.34033 > office.lan.53: [udp sum ok] 0+ AAAA? google.com.
(28)
08:28:16.906512 IP (tos 0x0, ttl 64, id 8977, offset 0, flags [DF], proto
UDP (17), length 72)
office.lan.53 > 192.168.0.115.34033: [bad udp cksum 0x820a -> 0xc40b!]
0 q: A? google.com. 1/0/0 google.com. [3m37s] A 142.250.80.110 (44)
08:28:16.906696 IP (tos 0x0, ttl 64, id 8978, offset 0, flags [DF], proto
UDP (17), length 84)
office.lan.53 > 192.168.0.115.34033: [bad udp cksum 0x8216 -> 0x1d02!]
0 q: AAAA? google.com. 1/0/0 google.com. [5s] AAAA 2607:f8b0:4006:820::200e
(56)
08:28:19.257368 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP
(17), length 56)
192.168.0.115.53048 > office.lan.53: [udp sum ok] 0+ A? google.com. (28)
08:28:19.257466 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP
(17), length 56)
192.168.0.115.53048 > office.lan.53: [udp sum ok] 0+ AAAA? google.com.
(28)
08:28:19.257680 IP (tos 0x0, ttl 64, id 9078, offset 0, flags [DF], proto
UDP (17), length 72)
office.lan.53 > 192.168.0.115.53048: [bad udp cksum 0x820a -> 0x79c7!]
0 q: A? google.com. 1/0/0 google.com. [3m34s] A 142.250.80.110 (44)
08:28:19.257849 IP (tos 0x0, ttl 64, id 9079, offset 0, flags [DF], proto
UDP (17), length 84)
office.lan.53 > 192.168.0.115.53048: [bad udp cksum 0x8216 -> 0xd2bd!]
0 q: AAAA? google.com. 1/0/0 google.com. [2s] AAAA 2607:f8b0:4006:820::200e
(56)
08:28:20.354244 IP (tos 0x0, ttl 64, id 52155, offset 0, flags [DF], proto
TCP (6), length 52)
192.168.0.115.53400 > lga34s35-in-f4.1e100.net.443: Flags [.], cksum
0xf854 (correct), seq 2594363947, ack 50065344, win 135, options
[nop,nop,TS val 198343040 ecr 3566225862], length 0
08:28:20.358922 IP (tos 0x0, ttl 122, id 3787, offset 0, flags [none],
proto TCP (6), length 52)
lga34s35-in-f4.1e100.net.443 > 192.168.0.115.53400: Flags [.], cksum
0xa7b0 (correct), seq 1, ack 1, win 276, options [nop,nop,TS val 3566270916
ecr 198252953], length 0
08:28:20.482219 IP (tos 0x0, ttl 64, id 27145, offset 0, flags [DF], proto
TCP (6), length 52)
192.168.0.115.54184 > bc-in-f188.1e100.net.5228: Flags [.], cksum
0x4e35 (correct), seq 2783933939, ack 881888313, win 249, options
[nop,nop,TS val 198343168 ecr 855506216], length 0
08:28:20.492954 IP (tos 0x0, ttl 59, id 49690, offset 0, flags [none],
proto TCP (6), length 52)
bc-in-f188.1e100.net.5228 > 192.168.0.115.54184: Flags [.], cksum
0xfdcb (correct), seq 1, ack 1, win 274, options [nop,nop,TS val 855551371
ecr 198253037], length 0
08:28:20.860748 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP
(17), length 56)
192.168.0.115.49427 > office.lan.53: [udp sum ok] 0+ A? google.com. (28)
08:28:20.860857 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP
(17), length 56)
192.168.0.115.49427 > office.lan.53: [udp sum ok] 0+ AAAA? google.com.
(28)
08:28:20.861401 IP (tos 0x0, ttl 64, id 9095, offset 0, flags [DF], proto
UDP (17), length 72)
office.lan.53 > 192.168.0.115.49427: [bad udp cksum 0x820a -> 0x87ed!]
0 q: A? google.com. 1/0/0 google.com. [3m33s] A 142.250.80.110 (44)
08:28:20.861738 IP (tos 0x0, ttl 64, id 9096, offset 0, flags [DF], proto
UDP (17), length 84)
office.lan.53 > 192.168.0.115.49427: [bad udp cksum 0x8216 -> 0xe0e3!]
0 q: AAAA? google.com. 1/0/0 google.com. [1s] AAAA 2607:f8b0:4006:820::200e
(56)
08:28:20.862682 IP (tos 0xc0, ttl 64, id 59726, offset 0, flags [none],
proto ICMP (1), length 112)
192.168.0.115 > office.lan: ICMP 192.168.0.115 udp port 49427
unreachable, length 92
IP (tos 0x0, ttl 64, id 9096, offset 0, flags [DF], proto UDP (17),
length 84)
office.lan.53 > 192.168.0.115.49427: [udp sum ok] 0 q: AAAA? google.com.
1/0/0 google.com. [1s] AAAA 2607:f8b0:4006:820::200e (56)
08:28:21.985759 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
192.168.0.115 tell office.lan, length 28
08:28:22.133507 ARP, Ethernet (len 6), IPv4 (len 4), Reply 192.168.0.115
is-at 20:68:9d:0f:33:44 (oui Unknown), length 46
^C
19 packets captured
19 packets received by filter
0 packets dropped by kernel
On Thu, Feb 17, 2022 at 8:24 AM Rich Felker <dalias@...ifal.cx> wrote:
> On Thu, Feb 17, 2022 at 08:17:36AM -0500, Satadru Pramanik wrote:
> > Looks like reverting that commit works, but interestingly, only
> > stochastically.
> >
> > chronos@...alhost
> > /usr/local/tmp/crew/musl_getaddrinfo_test.20220217125953.dir $
> > ../musl_getaddrinfo_test google.com
> > getaddrinfo: Try again
> > chronos@...alhost
> > /usr/local/tmp/crew/musl_getaddrinfo_test.20220217125953.dir $
> > ../musl_getaddrinfo_test google.com
> > AF_INET6: 2607:f8b0:4006:81c::200e
> > AF_INET: 142.250.80.46
> > chronos@...alhost
> > /usr/local/tmp/crew/musl_getaddrinfo_test.20220217125953.dir $
> > ../musl_getaddrinfo_test google.com
> > AF_INET6: 2607:f8b0:4006:81c::200e
> > AF_INET: 142.250.80.46
> > chronos@...alhost
> > /usr/local/tmp/crew/musl_getaddrinfo_test.20220217125953.dir $
> > ../musl_getaddrinfo_test google.com
> > getaddrinfo: Try again
> > chronos@...alhost
> > /usr/local/tmp/crew/musl_getaddrinfo_test.20220217125953.dir $
> > ../musl_getaddrinfo_test google.com
> > AF_INET6: 2607:f8b0:4006:81c::200e
> > AF_INET: 142.250.80.46
> > chronos@...alhost
> > /usr/local/tmp/crew/musl_getaddrinfo_test.20220217125953.dir $
> > ../musl_getaddrinfo_test google.com
> > AF_INET6: 2607:f8b0:4006:81c::200e
> > AF_INET: 142.250.80.46
> > chronos@...alhost
> > /usr/local/tmp/crew/musl_getaddrinfo_test.20220217125953.dir $
> > ../musl_getaddrinfo_test google.com
> > getaddrinfo: Try again
> > chronos@...alhost
> > /usr/local/tmp/crew/musl_getaddrinfo_test.20220217125953.dir $
> > ../musl_getaddrinfo_test google.com
> > AF_INET6: 2607:f8b0:4006:81c::200e
> > AF_INET: 142.250.80.46
> > chronos@...alhost
> > /usr/local/tmp/crew/musl_getaddrinfo_test.20220217125953.dir $
> > ../musl_getaddrinfo_test google.com
> > getaddrinfo: Try again
> > chronos@...alhost
> > /usr/local/tmp/crew/musl_getaddrinfo_test.20220217125953.dir $
> > ../musl_getaddrinfo_test google.com
> > getaddrinfo: Try again
> > chronos@...alhost
> > /usr/local/tmp/crew/musl_getaddrinfo_test.20220217125953.dir $
> > ../musl_getaddrinfo_test google.com
> > AF_INET6: 2607:f8b0:4006:81c::200e
> > AF_INET: 142.250.80.46
>
> Can you tcpdump these again and see if there's network traffic when it
> fails? This sounds more like the nameserver being unreliable.
>
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