Re: SR standby hangs

On 02/18/2011 02:23 PM, Tom Lane wrote:
> Andrew Dunstan<andrew(at)dunslane(dot)net> writes:
>> The symptom is that the recovery process blocks forever on a semaphore.
>> We've crashed it and got the following backtrace:
>> #0 0x0000003493ed5337 in semop () from /lib64/libc.so.6
>> #1 0x00000000005bd103 in PGSemaphoreLock (sema=0x2b14986aec38, interruptOK=1
>> '\001') at pg_sema.c:420
>> #2 0x00000000005de645 in LockBufferForCleanup () at bufmgr.c:2432
>> #3 0x0000000000463733 in heap_xlog_clean (lsn=<value optimized out>,
>> record=0x1787e1c0) at heapam.c:4168
>> #4 heap2_redo (lsn=<value optimized out>, record=0x1787e1c0) at heapam.c:4858
>> #5 0x0000000000488780 in StartupXLOG () at xlog.c:6250
> So who's holding the buffer lock that it wants? Are you sure this is an
> actual hang, and not just recovery waiting for a standby query to complete?
>
>

It's not running HS, so there's no query to wait on.

cheers

andrew