This is driving me crazy. I have some Postgres C function extensions in a
shared library. They've been working fine. I upgraded to Fedora Core 6 and
gcc4, and now every time psql(1) disconnects from the server, the serverlog
gets this message:
*** glibc detected *** postgres: mydb mydb [local] idle: double free or
corruption! (!prev): 0x08bfcde8
and the backend process won't die. Every single connection that executes one
of my functions leaves an idle process, like this:
$ ps -ef | grep postgres
postgres 12938 12920 0 23:24 ? 00:00:00 postgres: mydb mydb [local] idle
This error only happens on disconnect. As long as I keep the connection open, I can
Worse, these zombie Postgres processes won't die, which means I can't shut down and
restart Postgres unless I "kill -9" all of them, and I can't use this at all
because I get zillions of these dead processes.
I've used valgrind on a test application that runs all of my functions outside
of the Postgres environment, and not a single problem shows up even after hours
of processing. I tried setting MALLOC_CHECK_ to various values, so that I
could trap the abort() call using gdb, but once MALLOC_CHECK_ is set, the
double-free error never occurs. (But malloc slows down too much this way.)
I even read through the documentation for C functions again, and carefully
examined my code. Nothing is amiss, some of the functions are quite simple yet
still exhibit this problem.
Anyone seen this before? It's driving me nuts.
Postgres 8.1.4
Linux kernel 2.6.22
gcc 4.1.1
Thanks,
Craig
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