Can you install the debuginfo package and run it with gdb to get stack trace? Also, can you give us ulimit -a?
Aki On Tue, May 20, 2014 at 11:41:21PM +0300, Imre Gergely wrote: > > [root@c605 ~]# cat /etc/pdns-recursor/recursor.conf |grep -v "^#" | grep > -v "^$" > setuid=pdns-recursor > setgid=pdns-recursor > daemon=no > local-address=127.0.0.1 > threads=1 > > [root@c605 ~]# strace /usr/sbin/pdns_recursor > > /tmp/strace-pdns-recursor.txt 2>&1 > Segmentation fault > [root@c605 ~]# > > [root@c605 ~]# ip a |grep inet |wc > 4576 27451 233679 > > Attached. If this is not what you had in mind, please let me know. > > On 05/20/2014 11:31 PM, bert hubert wrote: > > Imre, > > > > Can you strace the startup with threads=1? > > > > Bert > > > > On May 20, 2014 10:25 PM, Imre Gergely <[email protected]> wrote: > >> > >> Hi > >> > >> I did manage to reproduce this in a VM. Installed a CentOS 6.5, and > >> recursor 3.5.3 from EPEL. Then I did this: > >> > >> for i in `seq 1 16`; do for j in `seq 1 254`; do ip a a 10.0.$i.$j/16 dev > >> eth0; done; done > >> > >> Then I started the recursor, everything went just fine, did a bunch of > >> digs, no problems. > >> > >> Then I added some more IPs: > >> > >> for i in `seq 17 32`; do for j in `seq 1 254`; do ip a a 10.0.$i.$j/16 dev > >> eth0; done; done > >> > >> And then init.d/pdns-recursor restart: > >> > >> May 20 23:18:24 c605 pdns_recursor[21341]: PowerDNS recursor 3.5.3 (C) > >> 2001-2013 PowerDNS.COM BV (Feb 10 2014, 17:26:52, gcc 4.4.7 20120313 (Red > >> Hat 4.4.7-4)) > >> starting up > >> May 20 23:18:24 c605 pdns_recursor[21341]: PowerDNS comes with ABSOLUTELY > >> NO WARRANTY. This is free software, and you are welcome to redistribute it > >> according to the terms of the GPL version 2. > >> May 20 23:18:24 c605 pdns_recursor[21341]: Operating in 32 bits mode > >> May 20 23:18:24 c605 pdns_recursor[21341]: Reading random entropy from > >> '/dev/urandom' > >> May 20 23:18:24 c605 pdns_recursor[21341]: Only allowing queries from: > >> 127.0.0.0/8, 10.0.0.0/8, 100.64.0.0/10, 169.254.0.0/16, 192.168.0.0/16, > >> 172.16.0.0/12, ::1/128, fe80::/10 > >> May 20 23:18:24 c605 pdns_recursor[21341]: Will not send queries to: > >> 127.0.0.0/8, 10.0.0.0/8, 100.64.0.0/10, 169.254.0.0/16, 192.168.0.0/16, > >> 172.16.0.0/12, ::1/128, fe80::/10, 0.0.0.0, :: > >> May 20 23:18:24 c605 pdns_recursor[21341]: NOT using IPv6 for outgoing > >> queries - set 'query-local-address6=::' to enable > >> May 20 23:18:24 c605 pdns_recursor[21341]: Inserting rfc 1918 private > >> space zones > >> May 20 23:18:24 c605 pdns_recursor[21341]: Listening for UDP queries on > >> 127.0.0.1:53 > >> May 20 23:18:24 c605 pdns_recursor[21341]: Enabled TCP data-ready filter > >> for (slight) DoS protection > >> May 20 23:18:24 c605 pdns_recursor[21341]: Listening for TCP queries on > >> 127.0.0.1:53 > >> May 20 23:18:24 c605 pdns_recursor[21341]: Calling daemonize, going to > >> background > >> May 20 23:18:24 c605 pdns_recursor[21342]: Set effective group id to 499 > >> May 20 23:18:24 c605 pdns_recursor[21342]: Set effective user id to 498 > >> May 20 23:18:24 c605 pdns_recursor[21342]: Launching 2 threads > >> May 20 23:18:24 c605 pdns_recursor[21342]: Done priming cache with root > >> hints > >> May 20 23:18:24 c605 pdns_recursor[21342]: Enabled 'epoll' multiplexer > >> May 20 23:18:24 c605 pdns_recursor[21342]: Done priming cache with root > >> hints > >> May 20 23:18:24 c605 pdns_recursor[21342]: Refreshed . records > >> May 20 23:18:25 c605 kernel: pdns_recursor[21345]: segfault at ffff01d4 ip > >> 080b1626 sp b6397890 error 4 in pdns_recursor[8048000+112000] > >> > >> [root@c605 ~]# ip a |grep inet |wc > >> 4322 25927 220579 > >> [root@c605 ~]# /etc/init.d/pdns-recursor start > >> Starting pdns-recursor: [ OK ] <-- > >> starts OK > >> [root@c605 ~]# /etc/init.d/pdns-recursor stop > >> Stopping pdns-recursor: [ OK ] > >> > >> Adding one more /24: > >> > >> [root@c605 ~]# for j in `seq 1 254`; do ip a a 10.0.18.$j/16 dev eth0; done > >> [root@c605 ~]# /etc/init.d/pdns-recursor start > >> Starting pdns-recursor: [ OK ] > >> [root@c605 ~]# ip a |grep inet |wc > >> 4576 27451 233679 > >> > >> It says it starts, but it doesn't, just segfaults. > >> > >> [root@c605 ~]# file /bin/bash > >> /bin/bash: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), > >> dynamically linked (uses shared libs), for GNU/Linux 2.6.18, stripped > >> > >> > >> On 05/20/2014 10:58 PM, James Baer wrote: > >>> Hi All - I'm experiencing an issue that I am unsure if it is a bug or > >>> just something I need to adjust on my systems to account for. > >>> > >>> I have 2 servers, both running pdns_recursor (3.5.3) on Centos 6.5, > >>> installed from epel repository. The recursor is only listening on > >>> localhost on each system. > >>> > >>> I am experiencing somewhat random crashes of the recursor with the > >>> following error: > >>> > >>> kernel: pdns_recursor[21993]: segfault at 200001fc8 ip 0000000000472780 > >>> sp 00007f3f9c03f690 error 4 in pdns_recursor[400000+111000] > >>> > >>> Both servers have a large number of ip addresses bound to them, in the > >>> range of 3-4k. I was able to replicate the segfaults on one of the > >>> servers by adding additional ip addresses. When I got to around 4k ip > >>> addresses the recursor simply would not even start, just segafulted right > >>> away. I was able to get it to start again, by removing some ip addresses, > >>> so i know it has something to do with how many addresses I have bound the > >>> server. > >>> > >>> Any body have an ideas what I can do to correct this problem? I really > >>> don't see a reason why the recursor would care how many ip addresses I > >>> have on a system. > >>> > >>> thank you > >>> > >>> > >>> > >>> _______________________________________________ > >>> Pdns-users mailing list > >>> [email protected] > >>> http://mailman.powerdns.com/mailman/listinfo/pdns-users > >>> > >> -- > >> > >> Imre Gergely > >> > >> http://havaz.net > >> > >> gpg --keyserver subkeys.pgp.net --recv-keys 0x34525305 > >> > > -- > Imre Gergely > http://havaz.net > gpg --keyserver subkeys.pgp.net --recv-keys 0x34525305 > > _______________________________________________ > Pdns-users mailing list > [email protected] > http://mailman.powerdns.com/mailman/listinfo/pdns-users
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