Bug#815974: Segmentation fault in libresolv triggered by php5-fpm

To: "815974@bugs.debian.org" <815974@bugs.debian.org>, "carlos@systemhalted.org" <carlos@systemhalted.org>
Cc: "submit@bugs.debian.org" <submit@bugs.debian.org>
Subject: Bug#815974: Segmentation fault in libresolv triggered by php5-fpm
From: Fabian Niepelt <F.Niepelt@mittwald.de>
Date: Fri, 26 Feb 2016 12:46:27 +0000
Message-id: <[🔎] 1456490723.3473.36.camel@mittwald.de>
Reply-to: Fabian Niepelt <F.Niepelt@mittwald.de>, 815974@bugs.debian.org
In-reply-to: <[🔎] CAE2sS1hotHyGTgaJ5AnwRfK1Ak=KMs-FgUbq7YVJjzmEWs4nFQ@mail.gmail.com>
References: <[🔎] 1456476985.3473.19.camel@mittwald.de> <[🔎] CAE2sS1hotHyGTgaJ5AnwRfK1Ak=KMs-FgUbq7YVJjzmEWs4nFQ@mail.gmail.com>

This is the correct output, the older one contains a test I thought was
in an endless loop but succeeded after a few minutes.

Greetings

root@linux-6sir:~/glibc_tests > ./bug18665-tcp
info: old timeout value: 1
info: old retry attempt value: 4
info: old _res.options: 0x802c1
info: old _res.nscount value: 1
info: old _res.ndots value: 1
info: new timeout value: 1
info: new retry attempt value: 4
info: new _res.options: 0x802c1
info: new _res.nscount value: 3
info: new _res.ndots value: 1
info: server 0: 127.0.0.1/51085
info: server 1: 127.0.0.1/40189
info: server 2: 127.0.0.1/41315
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-address: STREAM/TCP 10.0.3.6 80
-address: STREAM/TCP 2001:db8::4:6 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-address: STREAM/TCP 10.0.3.6 80
-address: STREAM/TCP 2001:db8::4:6 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-address: STREAM/TCP 10.0.3.6 80
-address: STREAM/TCP 2001:db8::4:6 80
+error: Name or service not known
error: 3 errors detected
Aborted (core dumped)

root@linux-6sir:~/glibc_tests > ./tst-basic 
info: old timeout value: 1
info: old retry attempt value: 4
info: old _res.options: 0x802c1
info: old _res.nscount value: 1
info: old _res.ndots value: 1
info: new timeout value: 1
info: new retry attempt value: 4
info: new _res.options: 0x802c1
info: new _res.nscount value: 3
info: new _res.ndots value: 1
info: server 0: 127.0.0.1/53644
info: server 1: 127.0.0.1/35595
info: server 2: 127.0.0.1/36343
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: www.example
-address: 192.0.2.17
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: www.example
-address: 192.0.2.17
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: www.example
-address: 192.0.2.17
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: www.example
-address: 192.0.2.17
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-name: www.example
-alias: alias.example
-address: 192.0.2.18
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-name: www.example
-alias: alias.example
-address: 192.0.2.18
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-name: www.example
-alias: alias.example
-address: 192.0.2.18
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-name: www.example
-alias: alias.example
-address: 192.0.2.18
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: www.example
-address: 2001:db8::1
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: www.example
-address: 2001:db8::1
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-name: www.example
-alias: alias.example
-address: 2001:db8::2
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-name: www.example
-alias: alias.example
-address: 2001:db8::2
+error: HOST_NOT_FOUND
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,6 +1 @@
-address: STREAM/TCP 192.0.2.17 80
-address: DGRAM/UDP 192.0.2.17 80
-address: RAW/IP 192.0.2.17 80
-address: STREAM/TCP 2001:db8::1 80
-address: DGRAM/UDP 2001:db8::1 80
-address: RAW/IP 2001:db8::1 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,6 +1 @@
-address: STREAM/TCP 192.0.2.18 80
-address: DGRAM/UDP 192.0.2.18 80
-address: RAW/IP 192.0.2.18 80
-address: STREAM/TCP 2001:db8::2 80
-address: DGRAM/UDP 2001:db8::2 80
-address: RAW/IP 2001:db8::2 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-address: STREAM/TCP 192.0.2.17 80
-address: DGRAM/UDP 192.0.2.17 80
-address: RAW/IP 192.0.2.17 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-address: STREAM/TCP 192.0.2.18 80
-address: DGRAM/UDP 192.0.2.18 80
-address: RAW/IP 192.0.2.18 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-address: STREAM/TCP 2001:db8::1 80
-address: DGRAM/UDP 2001:db8::1 80
-address: RAW/IP 2001:db8::1 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-address: STREAM/TCP 2001:db8::2 80
-address: DGRAM/UDP 2001:db8::2 80
-address: RAW/IP 2001:db8::2 80
+error: Name or service not known
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: t.www.example
-address: 192.0.2.19
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: t.www.example
-address: 192.0.2.19
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: t.www.example
-address: 192.0.2.19
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: t.www.example
-address: 192.0.2.19
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-name: www.example
-alias: t.alias.example
-address: 192.0.2.20
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-name: www.example
-alias: t.alias.example
-address: 192.0.2.20
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-name: www.example
-alias: t.alias.example
-address: 192.0.2.20
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-name: www.example
-alias: t.alias.example
-address: 192.0.2.20
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: t.www.example
-address: 2001:db8::3
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: t.www.example
-address: 2001:db8::3
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-name: www.example
-alias: t.alias.example
-address: 2001:db8::4
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-name: www.example
-alias: t.alias.example
-address: 2001:db8::4
+error: HOST_NOT_FOUND
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,6 +1 @@
-address: STREAM/TCP 192.0.2.19 80
-address: DGRAM/UDP 192.0.2.19 80
-address: RAW/IP 192.0.2.19 80
-address: STREAM/TCP 2001:db8::3 80
-address: DGRAM/UDP 2001:db8::3 80
-address: RAW/IP 2001:db8::3 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,6 +1 @@
-address: STREAM/TCP 192.0.2.20 80
-address: DGRAM/UDP 192.0.2.20 80
-address: RAW/IP 192.0.2.20 80
-address: STREAM/TCP 2001:db8::4 80
-address: DGRAM/UDP 2001:db8::4 80
-address: RAW/IP 2001:db8::4 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-address: STREAM/TCP 192.0.2.19 80
-address: DGRAM/UDP 192.0.2.19 80
-address: RAW/IP 192.0.2.19 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-address: STREAM/TCP 192.0.2.20 80
-address: DGRAM/UDP 192.0.2.20 80
-address: RAW/IP 192.0.2.20 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-address: STREAM/TCP 2001:db8::3 80
-address: DGRAM/UDP 2001:db8::3 80
-address: RAW/IP 2001:db8::3 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-address: STREAM/TCP 2001:db8::4 80
-address: DGRAM/UDP 2001:db8::4 80
-address: RAW/IP 2001:db8::4 80
+error: Name or service not known
error: 36 errors detected
Aborted (core dumped)

root@linux-6sir:~/glibc_tests > ./tst-maxpacket
info: old timeout value: 1
info: old retry attempt value: 4
info: old _res.options: 0x802c1
info: old _res.nscount value: 1
info: old _res.ndots value: 1
info: new timeout value: 1
info: new retry attempt value: 4
info: new _res.options: 0x802c1
info: new _res.nscount value: 3
info: new _res.ndots value: 1
info: server 0: 127.0.0.1/51171
info: server 1: 127.0.0.1/51428
info: server 2: 127.0.0.1/46842
error: res_send for size 512: -1 (Success)
Aborted (core dumped)

root@linux-6sir:~/glibc_tests > ./tst-partial-fail
info: old timeout value: 1
info: old retry attempt value: 4
info: old _res.options: 0x802c1
info: old _res.nscount value: 1
info: old _res.ndots value: 1
info: new timeout value: 1
info: new retry attempt value: 4
info: new _res.options: 0x802c1
info: new _res.nscount value: 3
info: new _res.ndots value: 1
info: server 0: 127.0.0.1/40987
info: server 1: 127.0.0.1/35157
info: server 2: 127.0.0.1/35963
info: test case -4/-4
- -4 -4 error: No address associated with hostname 
+ -4 -4 error: Name or service not known 
info: old timeout value: 1
info: old retry attempt value: 4
info: old _res.options: 0x802c1
info: old _res.nscount value: 1
info: old _res.ndots value: 1
info: new timeout value: 1
info: new retry attempt value: 4
info: new _res.options: 0x802c1
info: new _res.nscount value: 3
info: new _res.ndots value: 1
info: server 0: 127.0.0.1/45727
info: server 1: 127.0.0.1/32896
info: server 2: 127.0.0.1/49856
[...]
error: 1 errors encountered
Aborted (core dumped)

root@linux-6sir:~/glibc_tests > ./tst-reverse
info: old timeout value: 1
info: old retry attempt value: 4
info: old _res.options: 0x802c1
info: old _res.nscount value: 1
info: old _res.ndots value: 1
info: new timeout value: 1
info: new retry attempt value: 4
info: new _res.options: 0x802c1
info: new _res.nscount value: 3
info: new _res.ndots value: 1
info: server 0: 127.0.0.1/50355
info: server 1: 127.0.0.1/41108
info: server 2: 127.0.0.1/58830
error: hostent comparison failure
--- expected
+++ actual
@@ -1 +1 @@
-error: NO_ADDRESS
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: aab.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
-address: 192.0.2.2
+error: HOST_NOT_FOUND
error: getnameinfo difference for 2
expected: aab.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
actual: 192.0.2.2
Aborted (core dumped)

root@linux-6sir:~/glibc_tests > ./tst-rotate
info: tcp=0 nscount=1 disable=-1 drop=-1
info: old timeout value: 1
info: old retry attempt value: 4
info: old _res.options: 0x802c1
info: old _res.nscount value: 1
info: old _res.ndots value: 1
info: new timeout value: 1
info: new retry attempt value: 4
info: new _res.options: 0x802c1
info: new _res.nscount value: 1
info: new _res.ndots value: 1
info: server 0: 127.0.0.1/33794
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: host.example
-address: 192.0.2.1
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: host.example
-address: 192.0.2.1
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: host.example
-address: 192.0.2.1
+error: HOST_NOT_FOUND
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1 +1 @@
-address: STREAM/TCP 192.0.2.1 80
+error: Name or service not known
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: 2.host.example
-address: 192.0.2.2
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: 2.host.example
-address: 192.0.2.2
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: 2.host.example
-address: 192.0.2.2
+error: HOST_NOT_FOUND
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1 +1 @@
-address: STREAM/TCP 192.0.2.2 80
+error: Name or service not known
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: host.example
-address: 2001:db8::1
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: host.example
-address: 2001:db8::1
+error: HOST_NOT_FOUND
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1 +1 @@
-address: STREAM/TCP 2001:db8::1 80
+error: Name or service not known
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: 2.host.example
-address: 2001:db8::2
+error: HOST_NOT_FOUND
error: hostent comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-name: 2.host.example
-address: 2001:db8::2
+error: HOST_NOT_FOUND
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1 +1 @@
-address: STREAM/TCP 2001:db8::2 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-address: STREAM/TCP 192.0.2.1 80
-address: STREAM/TCP 2001:db8::1 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-address: STREAM/TCP 192.0.2.2 80
-address: STREAM/TCP 2001:db8::2 80
+error: Name or service not known
error: nscount=1, but no query to server 0
Aborted (core dumped)

root@linux-6sir:~/glibc_tests > ./tst-search
info: old timeout value: 1
info: old retry attempt value: 4
info: old _res.options: 0x802c1
info: old _res.nscount value: 1
info: old _res.ndots value: 1
info: new timeout value: 1
info: new retry attempt value: 4
info: new _res.options: 0x802c1
info: new _res.nscount value: 3
info: new _res.ndots value: 1
info: server 0: 127.0.0.1/52154
info: server 1: 127.0.0.1/57871
info: server 2: 127.0.0.1/35280
error: hostent comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-name: file.corp.example.com
-address: 10.5.0.0
-address: 10.5.0.1
+error: TRY_AGAIN
error: hostent comparison failure
--- expected
+++ actual
@@ -1,3 +1 @@
-name: file.corp.example.com
-address: 10.5.0.0
-address: 10.5.0.1
+error: TRY_AGAIN
error: res_search ("file")
Aborted (core dumped)

root@linux-6sir:~/glibc_tests > head -100 tst-size-sweep.out
info: old timeout value: 1
info: old retry attempt value: 4
info: old _res.options: 0x802c1
info: old _res.nscount value: 1
info: old _res.ndots value: 1
info: new timeout value: 1
info: new retry attempt value: 4
info: new _res.options: 0x802c1
info: new _res.nscount value: 3
info: new _res.ndots value: 1
info: server 0: 127.0.0.1/60408
info: server 1: 127.0.0.1/35351
info: server 2: 127.0.0.1/42052
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,2 +1 @@
-address: STREAM/TCP 255.0.0.0 80
-address: STREAM/TCP 2001:db8::0:0:0 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,4 +1 @@
-address: STREAM/TCP 255.0.0.0 80
-address: STREAM/TCP 255.0.1.0 80
-address: STREAM/TCP 2001:db8::0:0:0 80
-address: STREAM/TCP 2001:db8::0:1:0 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,6 +1 @@
-address: STREAM/TCP 255.0.0.0 80
-address: STREAM/TCP 255.0.1.0 80
-address: STREAM/TCP 255.0.2.0 80
-address: STREAM/TCP 2001:db8::0:0:0 80
-address: STREAM/TCP 2001:db8::0:1:0 80
-address: STREAM/TCP 2001:db8::0:2:0 80
+error: Name or service not known
error: addrinfo comparison failure
--- expected
+++ actual
@@ -1,8 +1 @@
-address: STREAM/TCP 255.0.0.0 80
-address: STREAM/TCP 255.0.1.0 80
-address: STREAM/TCP 255.0.2.0 80
-address: STREAM/TCP 255.0.3.0 80
-address: STREAM/TCP 2001:db8::0:0:0 80
-address: STREAM/TCP 2001:db8::0:1:0 80
-address: STREAM/TCP 2001:db8::0:2:0 80
-address: STREAM/TCP 2001:db8::0:3:0 80
+error: Name or service not known
error: addrinfo comparison failure

Reply to:

Follow-Ups:
- Bug#815974: Segmentation fault in libresolv triggered by php5-fpm
  - From: "Carlos O'Donell" <carlos@systemhalted.org>

References:
- Bug#815974: Segmentation fault in libresolv triggered by php5-fpm
  - From: Fabian Niepelt <F.Niepelt@mittwald.de>
- Bug#815974: Segmentation fault in libresolv triggered by php5-fpm
  - From: "Carlos O'Donell" <carlos@systemhalted.org>

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