On 2/6/07, daniel(a)ncsu.edu <daniel(a)ncsu.edu&gt; wrote: > Hi folk, > > I want to start this message by saying, what I'm about to describe is > completely vague and I don't expect to get a solution response. ;) > Basically, I'm out of ideas and am looking for some suggestions as > to how > to debug the issue I'm running into. > > Starting about half a year ago, slapd started "just dieing" out of > the > blue. Not a think in the logs shows up to indicate what might > have caused > it. The last query that I see in the logs before a crash always > seems to > be nothing special. I don't even see a core dump being generated > yet, but > then that may just be because I don't have the proper setup to get > a core > dump at this time. We were running the last 2.2 and upgraded to the > latest release of 2.3 to make sure it wasn't an "old version" issue. > Unfortunately, slapd still dies a fair amount on us. It appears > to be > fairly unpredictable. I've seen it crash within 1 minute of > starting up > slapd (then a subsequent startup 'takes' just fine). I've seen it > crash > when there were a number of network issues going on. I've seen it > crash > out of the blue when nothing appeared to be going on. I don't > really have > the drive space to turn on max debug logging 24/7 until the problem > occurs. > > We're thinking about setting up something to watch all of the network > traffic going to one of the boxes until it dies. (assuming we can > find > something with the resources to do that) > > That all said... since I have nothing solid to present, do you > all have > any suggestions of what would be the best way to track down what's > going > on? I'm literally out of ideas unless my berkeley db config is > somehow > causing the problem or something like that. > > I apologize for the vagueness. =/ Any ideas/suggestions? > After the crash, is your bdb environment clean, or is it needing a db_recover? Depending on your OS, you could watch the pid all the time and trap the last signals received, last files accessed, etc, and that wouldn't take tons of resources.

You could try turning on max debugging and simply rotate a lot more often. (every n minutes or even seconds) This way you could definitely keep the -last- transactions and just not worry about the old ones.

I don't even see a core dump being generated yet, but then that may just be because I don't have the proper setup to get a core dump at this time.

On Feb 6, 2007, at 3:34 PM, Quanah Gibson-Mount wrote: > > > --On Tuesday, February 06, 2007 1:35 PM -0500 matthew sporleder > <msporleder(a)gmail.com&gt; wrote: > >> On 2/6/07, daniel(a)ncsu.edu <daniel(a)ncsu.edu&gt; wrote: >>> Hi folk, >>> >>> I want to start this message by saying, what I'm about to >>> describe is >>> completely vague and I don't expect to get a solution response. ;) >>> Basically, I'm out of ideas and am looking for some suggestions >>> as to how >>> to debug the issue I'm running into. >>> >>> Starting about half a year ago, slapd started "just dieing" out >>> of the >>> blue. Not a think in the logs shows up to indicate what might have >>> caused it. The last query that I see in the logs before a crash >>> always >>> seems to be nothing special. I don't even see a core dump being >>> generated yet, but then that may just be because I don't have >>> the proper >>> setup to get a core dump at this time. We were running the last >>> 2.2 and >>> upgraded to the latest release of 2.3 to make sure it wasn't an >>> "old >>> version" issue. Unfortunately, slapd still dies a fair amount on >>> us. It >>> appears to be fairly unpredictable. I've seen it crash within 1 >>> minute >>> of starting up slapd (then a subsequent startup 'takes' just fine). >>> I've seen it crash when there were a number of network issues >>> going on. >>> I've seen it crash out of the blue when nothing appeared to be >>> going on. >>> I don't really have the drive space to turn on max debug logging >>> 24/7 >>> until the problem occurs. >>> >>> We're thinking about setting up something to watch all of the >>> network >>> traffic going to one of the boxes until it dies. (assuming we >>> can find >>> something with the resources to do that) >>> >>> That all said... since I have nothing solid to present, do you >>> all have >>> any suggestions of what would be the best way to track down >>> what's going >>> on? I'm literally out of ideas unless my berkeley db config is >>> somehow >>> causing the problem or something like that. >>> >>> I apologize for the vagueness. =/ Any ideas/suggestions? >>> >> >> >> After the crash, is your bdb environment clean, or is it needing a >> db_recover? >> Depending on your OS, you could watch the pid all the time and trap >> the last signals received, last files accessed, etc, and that >> wouldn't >> take tons of resources. >> >> You could try turning on max debugging and simply rotate a lot more >> often. (every n minutes or even seconds) This way you could >> definitely keep the -last- transactions and just not worry about the >> old ones. > > Also, what database backend are you using? Why not build slapd > with debugging symbols so you can get a core? BDB and I am planning on doing so ;D > What version of 2.3 are you running at the moment? You say you > had upgraded to the latest release at some point, but not what > release that was. Up until around 2.3.28, there were issues in > the connection code that caused random crashes on my servers. > 2.3.33 would be your best bet to eliminate that as an issue if you > aren't there yet. 2.3.32 is what we're running right now. I've been sticking with the version that's labelled as "stable". Do y'all recommend going with the release instead of the "stable"? I've at least been having this issue since 2.2.whatever, so it's been going on for quite some time version wise. Timewise, I still think something may have changed in my world to cause all of this, but just can't track it down. Anyway, I'm working on setting up some things with which I can track it. Thanks! Daniel > > --Quanah > > -- > Quanah Gibson-Mount > Principal Software Developer > ITS/Shared Application Services > Stanford University > GnuPG Public Key: http://www.stanford.edu/~quanah/pgp.html

--On Wednesday, April 11, 2007 1:25 PM -0400 Daniel Henninger <daniel(a)ncsu.edu&gt; wrote: > Been a while, but I finally caught a core dump. Of course, I'm not > entirely sure why there's so few useful symbols showing since I > compiled > it with debugging symbols and didn't strip it. =/ Anyway, the > information I got from it is interesting: > > (gdb) bt > # 0 0x000b4694 in ?? () > # 1 0x000e175c in avl_delete () > # 2 0x000b4c48 in bdb_idl_cache_put () > # 3 0x000b5930 in bdb_idl_fetch_key () > # 4 0x000b796c in bdb_key_read () > # 5 0x000b30b0 in bdb_filter_candidates () > # 6 0x000b3a28 in ?? () > # 7 0x000b3a28 in ?? () > Backtrace stopped: previous frame identical to this frame (corrupt > stack?) > (gdb) > > Is it possible I just have a busted version of berkeley db?! What > version are you all using? (I guess it's Oracle DB now...) We > are using > version 4.2.52. Built with --enable-compat185. Hi Daniel, What does "file slapd" say? In general, "make install" will strip the symbols from slapd even if you built it with debugging etc.

As for BDB 4.2.52, you must apply the patches from Oracle as well, otherwise it is known to corrupt.

--Quanah -- Quanah Gibson-Mount Senior Systems Software Developer ITS/Shared Application Services Stanford University GnuPG Public Key: http://www.stanford.edu/~quanah/pgp.html

On Apr 11, 2007, at 1:30 PM, Quanah Gibson-Mount wrote: > --On Wednesday, April 11, 2007 1:25 PM -0400 Daniel Henninger > <daniel(a)ncsu.edu&gt; wrote: > >> Been a while, but I finally caught a core dump. Of course, I'm not >> entirely sure why there's so few useful symbols showing since I >> compiled >> it with debugging symbols and didn't strip it. =/ Anyway, the >> information I got from it is interesting: >> >> (gdb) bt >> # 0 0x000b4694 in ?? () >> # 1 0x000e175c in avl_delete () >> # 2 0x000b4c48 in bdb_idl_cache_put () >> # 3 0x000b5930 in bdb_idl_fetch_key () >> # 4 0x000b796c in bdb_key_read () >> # 5 0x000b30b0 in bdb_filter_candidates () >> # 6 0x000b3a28 in ?? () >> # 7 0x000b3a28 in ?? () >> Backtrace stopped: previous frame identical to this frame >> (corrupt stack?) >> (gdb) >> >> Is it possible I just have a busted version of berkeley db?! What >> version are you all using? (I guess it's Oracle DB now...) We >> are using >> version 4.2.52. Built with --enable-compat185. > > Hi Daniel, > > What does "file slapd" say? In general, "make install" will strip > the symbols from slapd even if you built it with debugging etc. Aww crap! =( /local/ldap/libexec/slapd: ELF 32-bit MSB executable, SPARC, version 1 (SYSV), dynamically linked (uses shared libs), stripped Didn't think about that, thanks! > As for BDB 4.2.52, you must apply the patches from Oracle as well, > otherwise it is known to corrupt. Any newer ones suuggested over 4.2.52? I have no qualms at all with upgrading, just don't want to dive into a known busticated version. =) Daniel > > --Quanah > > > -- > Quanah Gibson-Mount > Senior Systems Software Developer > ITS/Shared Application Services > Stanford University > GnuPG Public Key: http://www.stanford.edu/~quanah/pgp.html