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From: "akshay.moghe+sourceware at gmail dot com" <sourceware-bugzilla@sourceware.org> To: glibc-bugs@sourceware.org Subject: [Bug libc/11156] DNS name resolution issue when the answer does not allow recursion Date: Fri, 13 Mar 2020 07:21:46 +0000 [thread overview] Message-ID: <bug-11156-131-iI0J9w6gqt@http.sourceware.org/bugzilla/> (raw) In-Reply-To: <bug-11156-131@http.sourceware.org/bugzilla/> https://sourceware.org/bugzilla/show_bug.cgi?id=11156 --- Comment #4 from Akshay <akshay.moghe+sourceware at gmail dot com> --- Some additional information: 1. First ping akshay@spitfire:~$ ping vcc.healthdirect.org.au ping: unknown host vcc.healthdirect.org.au 2. Next, dig akshay@spitfire:~$ dig vcc.healthdirect.org.au @127.0.1.1 ; <<>> DiG 9.10.3-P4-Ubuntu <<>> vcc.healthdirect.org.au @127.0.1.1 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59265 ;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;vcc.healthdirect.org.au. IN A ;; ANSWER SECTION: vcc.healthdirect.org.au. 299 IN CNAME _aliased.coviu.com. _aliased.coviu.com. 299 IN CNAME production-ui-alb-975266950.ap-southeast-2.elb.amazonaws.com. production-ui-alb-975266950.ap-southeast-2.elb.amazonaws.com. 59 IN A 52.65.119.14 production-ui-alb-975266950.ap-southeast-2.elb.amazonaws.com. 59 IN A 13.237.79.63 ;; Query time: 62 msec ;; SERVER: 127.0.1.1#53(127.0.1.1) ;; WHEN: Fri Mar 13 00:19:51 PDT 2020 ;; MSG SIZE rcvd: 187 3. Strace `ping` access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/x86_64-linux-gnu/libresolv.so.2", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P9\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=101200, ...}) = 0 mmap(NULL, 2206280, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fa57db7d000 mprotect(0x7fa57db94000, 2097152, PROT_NONE) = 0 mmap(0x7fa57dd94000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0x7fa57dd94000 mmap(0x7fa57dd96000, 6728, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fa57dd96000 close(3) = 0 mprotect(0x7fa57dd94000, 4096, PROT_READ) = 0 mprotect(0x7fa57df9d000, 4096, PROT_READ) = 0 munmap(0x7fa57eb8d000, 110815) = 0 stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=183, ...}) = 0 socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 3 connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.1.1")}, 16) = 0 poll([{fd=3, events=POLLOUT}], 1, 0) = 1 ([{fd=3, revents=POLLOUT}]) sendto(3, "\211P\1\0\0\1\0\0\0\0\0\0\3vcc\fhealthdirect\3or"..., 41, MSG_NOSIGNAL, NULL, 0) = 41 poll([{fd=3, events=POLLIN}], 1, 5000) = 1 ([{fd=3, revents=POLLIN}]) ioctl(3, FIONREAD, [176]) = 0 recvfrom(3, "\211P\201\200\0\1\0\4\0\0\0\0\3vcc\fhealthdirect\3or"..., 1024, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.1.1")}, [16]) = 176 close(3) = 0 write(2, "ping: unknown host vcc.healthdir"..., 43ping: unknown host vcc.healthdirect.org.au ) = 43 exit_group(2) = ? These 3 results align perfectly with the referenced blog post, hence I'm drawing attention here once again -- You are receiving this mail because: You are on the CC list for the bug.
next prev parent reply other threads:[~2020-03-13 7:21 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <bug-11156-131@http.sourceware.org/bugzilla/> 2011-02-04 1:30 ` pasky at suse dot cz 2014-06-30 20:25 ` fweimer at redhat dot com 2020-03-13 7:17 ` akshay.moghe+sourceware at gmail dot com 2020-03-13 7:21 ` akshay.moghe+sourceware at gmail dot com [this message] 2020-03-13 7:25 ` [Bug network/11156] " fw at deneb dot enyo.de 2020-03-13 22:09 ` akshay.moghe+sourceware at gmail dot com 2020-03-14 7:31 ` fw at deneb dot enyo.de 2010-01-09 18:37 [Bug libc/11156] New: " toni dot castillo at fa dot upc dot edu 2010-04-04 19:16 ` [Bug libc/11156] " drepper at redhat dot com
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