Problems with localtime's use of the TZ environment var?

For the past few years I've had occasional and random bouts of internal
server errors. I've always assumed it to be a bug in the CGI (written in
c++). I've installed mpatrol recently and attempted to find and stomp
out this problem.

I've narrowed it down thus far:
#11 0x2835f99d in tzsetwall () from /lib/libc.so.5
#12 0x2835fd41 in localtime_r () from /lib/libc.so.5
#13 0x283602a5 in ctime_r () from /lib/libc.so.5
#14 0x28118eaa in TLogger::writeLog (this=0x805c000, filename=0x8055ef6
"request.cpp", lineno=248) at tlogger.cpp:65

In my logging routine it's fairly simple. It's been hacked up over time
but it looks somewhat like this:

  time_t now=time(NULL);
  std::string timestamp;
  char ctimestamp[20];
  ctime_r(&now,&ctimestamp[0]);
  timestamp+=ctimestamp;
  timestamp.erase(24);

  (*logfile) << timestamp 
             << " - (" << ourpid << ") " 
             << filename << '(' << lineno << ')' << " - ";

  logfile->flush();

The only thing I can think of is that somehow this is caching a pointer
to getenv(TZ) and accepting a request is messing with this. It seems to
happen about one in every 1000 log writes. 

Does anyone have any input on my problem? I only partly know what I'm
doing here :)

-Michael
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