Hello everybody

I have some strange problems when using libcurl in multiple threads. I've
spend days of debugging and modifying my source, and now I'm completely
helpless :-(
I have an application which uses 10 threads (I had the problem with lower
counts of threads too). Each thread calls a curl_easy_init to get a curl
handle. All threads are doing constantly HTTP requests.

Now my Problems:

On Linux:
The program runs fine for a few minutes, but then it crashes with a
segmentation fault. Valgrind told me, that the reason for crashing is inside
of libcurl. Here the output of valgrind:

==1487== valgrind's libpthread.so: KLUDGED call to: siglongjmp (cleanup
handlers are ignored)
==1487== Invalid read of size 4
==1487== at 0x40235303: Curl_resolv (hostip.c:242)
==1487== Address 0x41B0C3B0 is on thread 1's stack
==1487==
==1487== Invalid read of size 4
==1487== at 0x4023B01B: Curl_failf (sendf.c:154)
==1487== Address 0x10 is not stack'd, malloc'd or free'd

I thougth this might be a problem of setting the wrong options. So I tried to
remove the calls of curl_easy_setopt to a minimum (I already tried reducing
all code to a minimum *g*), but it didn't help.

On Windows:
On Windows the program doesn't crash (I even used a memory debugger too), but
it shows some other strange behaviour: First everything works fine too, but
then the CPU load jumps to 100% and won't come down until I terminate all
threads. As far as I could figure out, the calls (or at least one call) of
curl_easy_perform must produce the high CPU load. But none of them hangs up
(just getting extremely slow).

All these problems are gone, if I reduce the number of threads to 1. I hope
somebody of you has an idea what I could do.

Konstantin Schauwecker

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Received on 2003-06-01