[ Thread moved to hackers.] Crash reproduced here.
My guess is that you are recursing and crashing the backend, which then forces the other backends to reset. I think we need to fix this by either setting a limit in the amount of function recursion, or allowing only the offending backend to crash without forcing all the other backends to crash. --------------------------------------------------------------------------- Marcin Owsiany wrote: > CREATE FUNCTION "x" (integer) RETURNS integer AS ' > BEGIN > RETURN x(0); > END' LANGUAGE 'plpgsql' WITH ( isstrict ); > SELECT x(0); > server closed the connection unexpectedly > This probably means the server terminated abnormally > before or while processing the request. > The connection to the server was lost. Attempting reset: Failed. > !> > > The log says: > DEBUG: server process (pid 3550) was terminated by signal 11 > DEBUG: terminating any other active server processes > > The thing that worries me most is the last message: postmaster terminates all > other backends, therefore overflowing the stack via a plpgsql function can be > used to DoS-attack the server. > > Is there anything one (as a postgresql installation admin) can do? Disabling > procedural languages in databases of the users I don't trust comes to mind, but > does it really make me safe? I mean: won't such attack still be possible with > pure SQL? > > regards, > > Marcin > -- > Marcin Owsiany <[EMAIL PROTECTED]> http://marcin.owsiany.pl/ > GnuPG: 1024D/60F41216 FE67 DA2D 0ACA FC5E 3F75 D6F6 3A0D 8AA0 60F4 1216 > > "Every program in development at MIT expands until it can read mail." > -- Unknown > > ---------------------------(end of broadcast)--------------------------- > TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED] > -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster
