Re: [HACKERS] strange segfault with 8.3.8
W dniu 7 grudnia 2009 17:43 użytkownik Greg Smith g...@2ndquadrant.comnapisał: Filip Rembiałkowski wrote: Dec 7 07:24:45 nsXX kernel: postgres[22481]: segfault at 7fda5e1d5000 ip 7fda604553c3 sp 7fffe41faf28 error 4 in libc-2.9.so [7fda603d1000+168000] Dec 7 07:24:45 nsXX kernel: grsec: From XX.YY.ZZ.51: Segmentation fault occurred at 7fda5e1d5000 in /usr/lib/postgresql/8.3/bin/postgres[postgres:22481] uid/euid:103/103 gid/egid:114/114, parent /usr/lib/postgresql/8.3/bin/postgres[postgres:29857] uid/euid:103/103 gid/egid:114/114 This is on 8.3.8, latest Ubuntu distribution, server under quite heavy load. afterwards we had some corrupted pages (*ERROR: compressed data is corrupt*). Random segfaults only under heavy load with corrupted pages afterwards normally means bad RAM. I'd suggest a round of memtest86+ on the system if it's PC hardware. Just a note for all other who may encouter this problem: This was not a vanilla Ubuntu - this was vendor-modified version, witch custom grsecurity patched kernel and probably with custom patched libc. # uname -a Linux nsXX.ovh.net 2.6.31.5-grsec--grs-ipv4-64 #2 SMP Thu Nov 5 12:36:20 UTC 2009 x86_64 GNU/Linux -- Filip Rembiałkowski JID,mailto:filip.rembialkow...@gmail.com http://filip.rembialkowski.net/
[HACKERS] strange segfault with 8.3.8
hello, from kernel log: Dec 7 07:24:45 nsXX kernel: postgres[22481]: segfault at 7fda5e1d5000 ip 7fda604553c3 sp 7fffe41faf28 error 4 in libc-2.9.so [7fda603d1000+168000] Dec 7 07:24:45 nsXX kernel: grsec: From XX.YY.ZZ.51: Segmentation fault occurred at 7fda5e1d5000 in /usr/lib/postgresql/8.3/bin/postgres[postgres:22481] uid/euid:103/103 gid/egid:114/114, parent /usr/lib/postgresql/8.3/bin/postgres[postgres:29857] uid/euid:103/103 gid/egid:114/114 This is on 8.3.8, latest Ubuntu distribution, server under quite heavy load. afterwards we had some corrupted pages (*ERROR: compressed data is corrupt* ). any clues / directions welcome. -- Filip Rembiałkowski JID,mailto:filip.rembialkow...@gmail.com http://filip.rembialkowski.net/
Re: [HACKERS] strange segfault with 8.3.8
Filip Rembiałkowski wrote: Dec 7 07:24:45 nsXX kernel: postgres[22481]: segfault at 7fda5e1d5000 ip 7fda604553c3 sp 7fffe41faf28 error 4 in libc-2.9.so http://libc-2.9.so/[7fda603d1000+168000] Dec 7 07:24:45 nsXX kernel: grsec: From XX.YY.ZZ.51: Segmentation fault occurred at 7fda5e1d5000 in /usr/lib/postgresql/8.3/bin/postgres[postgres:22481] uid/euid:103/103 gid/egid:114/114, parent /usr/lib/postgresql/8.3/bin/postgres[postgres:29857] uid/euid:103/103 gid/egid:114/114 This is on 8.3.8, latest Ubuntu distribution, server under quite heavy load. afterwards we had some corrupted pages (//ERROR/: /compressed data/ is corrupt/). Random segfaults only under heavy load with corrupted pages afterwards normally means bad RAM. I'd suggest a round of memtest86+ on the system if it's PC hardware. -- Greg Smith2ndQuadrant Baltimore, MD PostgreSQL Training, Services and Support g...@2ndquadrant.com www.2ndQuadrant.com
