I would think someone would have noticed this in RHEL or CentOS if it was a pure kernel problem. What all are you running in the way of daemons? Something there could be to blame, no? Also, if the servers are identical in terms of software and hardware, have you considered a memory check? When I made the switch from Windows to Linux I discovered something interesting. Since Linux caches memory (as you probably already know) sometimes you are more likely to find out memory is defective on Windows than Linux, especially if the defect is at the end of the RAM, if that makes sense. The first time I experienced this was with a computer that originally ran Windows. Since it never touched the full 768mb I never had a problem. I switched to Linux and it started crashing immediately. I blamed it on Linux, but then ran the memory test and found out that what was happening is that Windows never used enough memory to touch that spot of bad RAM. But Linux did, caching it all then crashing. Maybe a longshot, but just in case your hardware and software configurations are identical (because you did mention two machines) it might be worth considering. Preston -------- Original Message --------> From: israel.garcia at cimex.com.cu > Sent: Friday, June 10, 2005 5:27 PM > To: centos at centos.org > Subject: [CentOS] memory leaking?? kernel problem? > > List, I have the two servers CentOS 4.0 (running postfix, mailscanner) on this hardware: HP netserver 2000, PIII - 1GHz, 512 ram, two Hdd SCSI - 36 GB (RAID 1), I have monitored this server for a couple of months and I've seen that the memory used is increasing every week until it reaches all available memory and the server crashes.... at this point mailscanner crashes or sometimes the server gets freezed....my question is? > > Is this a memory leak? > > I 've always used this combination (mailscanner, postfix on Whitebox) and never got a problem, but when I upgrade my system to CentOS (kernel 2.6) this problem began.. > > can you help me? > > regards > > Israel > > > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos
I reported the same problem (OOM's on a 5GB system which should have had 3-4 GB free). It's a pure kernel problem and hopefully the new U1 kernel fixes this issue - it's in the redhat bugzilla, to quote: [this is the 2.6.9-5.0.5ELsmp kernel] OK ... there are known memory leak issues on that kernel Your problem is similar, but not exactly like: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=150971 we'll see whether the new U1 kernel helps... so long the situation seems much better... Cheers, MaZe.
israel.garcia at cimex.com.cu
2005-Jun-11 00:29 UTC
[CentOS] memory leaking?? kernel problem?
List, I have the two servers CentOS 4.0 (running postfix, mailscanner) on this hardware: HP netserver 2000, PIII - 1GHz, 512 ram, two Hdd SCSI - 36 GB (RAID 1), I have monitored this server for a couple of months and I've seen that the memory used is increasing every week until it reaches all available memory and the server crashes.... at this point mailscanner crashes or sometimes the server gets freezed....my question is? Is this a memory leak? I 've always used this combination (mailscanner, postfix on Whitebox) and never got a problem, but when I upgrade my system to CentOS (kernel 2.6) this problem began.. can you help me? regards Israel -------------- next part -------------- A non-text attachment was scrubbed... Name: winmail.dat Type: application/ms-tnef Size: 4078 bytes Desc: not available URL: <http://lists.centos.org/pipermail/centos/attachments/20050610/7f4f58da/attachment-0004.bin>
On Fri, 2005-06-10 at 19:29 -0500, israel.garcia at cimex.com.cu wrote:> List, I have the two servers CentOS 4.0 (running postfix, mailscanner) on this hardware: HP netserver 2000, PIII - 1GHz, 512 ram, two Hdd SCSI - 36 GB (RAID 1), I have monitored this server for a couple of months and I've seen that the memory used is increasing every week until it reaches all available memory and the server crashes.... at this point mailscanner crashes or sometimes the server gets freezed....my question is? > > Is this a memory leak? > > I 've always used this combination (mailscanner, postfix on Whitebox) and never got a problem, but when I upgrade my system to CentOS (kernel 2.6) this problem began.. > > can you help me? > > regards > > IsraelTry the 2.6.9-11.EL kernel that was just released. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 189 bytes Desc: This is a digitally signed message part URL: <http://lists.centos.org/pipermail/centos/attachments/20050610/4d1eb271/attachment-0003.sig>
On Friday 10 June 2005 07:29 pm, israel.garcia at cimex.com.cu wrote:> List, I have the two servers CentOS 4.0 (running postfix, mailscanner) on > this hardware: HP netserver 2000, PIII - 1GHz, 512 ram, two Hdd SCSI - 36 > GB (RAID 1), I have monitored this server for a couple of months and I've > seen that the memory used is increasing every week until it reaches all > available memory and the server crashes.... at this point mailscanner > crashes or sometimes the server gets freezed....my question is? > > Is this a memory leak? > > I 've always used this combination (mailscanner, postfix on Whitebox) and > never got a problem, but when I upgrade my system to CentOS (kernel 2.6) > this problem began.. >Are you running spamassassin? ?I had the same problem after upgrading to v3 of sa which rh4/c4 ships with.> can you help me? > > regards > > Israel