Segfaults with http2 on libcurl 7.60.0 #2674
Description
As of recently my programs started to segfault when Debian switch to libcurl with openssl+nghttp2. I think there are may be multiple issues.
Here is a simple program (link) that does the following:
create one multi-handle
repeat 20x {
- add 100 http/2 requests to the multi-handle
- run multi handle until all requests are done
- remove requests from the multi-handle
}
The program works on my macos with native libcurl (curl 7.54.0 (x86_64-apple-darwin17.0) libcurl/7.54.0 LibreSSL/2.0.20 zlib/1.2.11 nghttp2/1.24.0)
However on Debian (buster) the program segfaults after a while, both when compiled with libcurl4-openssl-dev as well as libcurl4-gnutls-dev. Both versions are libcurl 7.60.0.
I can also reproduce the problem on MacOS if I build libcurl with nghttp2 support:
brew install curl --with-nghttp2
brew link --force curlAnd now the program will segfault here as well:
clang test.c $(pkg-config --cflags --libs libcurl)
./a.out
# Round 0: adding 100 handles...
# Completed: 100 OK!
# Round 1: adding 100 handles...
# Completed: 100 OK!
# Round 2: adding 100 handles...
# Segmentation fault: 11And if I then brew unlink curl and recompile, everything is fine again.