Re: Finding cause of 389ds sefault crash

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> On 18 Mar 2021, at 18:46, thierry bordaz <tbordaz@xxxxxxxxxx> wrote:
> 
> Hi,
> 
> By any chance do you know if the crash (SIGSEV) dumped a core ?
> In such case you may install debuginfo rpm and analyze (gdb) the reason of the crash.
> 
> I am not sure the crash is due to a DB corruption/breakage but clearly the crash will trigger a recovery.
> Is the suffix (userRoot) replicated ? is it a supplier or a hub ?
> I have the feeling it crashed while compacting the changelog. bdb_db_compact_one_db is possibly missing a test that the 'db' (changelog) exists before dereferencing it.

Could be worth adding a log message and an ASSERT here so that we can catch this case if it's happening ... .

> 
> regards
> thierry 
> 
> On 3/18/21 8:08 AM, Nelson Bartley wrote:
>> Good afternoon
>> 
>> Our ns-slapd crashed earlier today, with a segfault in libback-ldbm.so
>> while the system was running a bdb_db_compact_one_db action.
>> 
>> Is there anyway to trackdown/diagnose what might have caused the
>> segfault? Some type of DB integrity check or something?
>> 
>> Nelson
>> 
>> 
>> 
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—
Sincerely,

William Brown

Senior Software Engineer, 389 Directory Server
SUSE Labs, Australia
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