And no, the same problem occurs on amd64, and with libc6 2.24-17.
$ flickcurl oauth.create
*** Error in `flickcurl': double free or corruption (fasttop):
0x000055b02e930c40 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x70bfb)[0x7f1d1de88bfb]
/lib/x86_64-linux-gnu/libc.so.6(+0x76fc6)[0x7f1d1de8efc6]
/lib/x86_64-linux-gnu/libc.so.6(+0x7780e)[0x7f1d1de8f80e]
/usr/lib/x86_64-linux-gnu/libflickcurl.so.0(flickcurl_free_form+0x11)[0x7f1d1ec86421]
/usr/lib/x86_64-linux-gnu/libflickcurl.so.0(flickcurl_oauth_create_request_token+0x1d9)[0x7f1d1eca2a09]
flickcurl(+0x112b3)[0x55b02c3a72b3]
flickcurl(+0xbdf3)[0x55b02c3a1df3]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)[0x7f1d1de382e1]
flickcurl(+0xbeaa)[0x55b02c3a1eaa]
======= Memory map: ========
55b02c396000-55b02c3b6000 r-xp 00000000 08:06 103
/usr/bin/flickcurl
55b02c5b6000-55b02c5b7000 r--p 00020000 08:06 103
/usr/bin/flickcurl
55b02c5b7000-55b02c5ba000 rw-p 00021000 08:06 103
/usr/bin/flickcurl
55b02d8c4000-55b02e982000 rw-p 00000000 00:00 0 [heap]
7f1d10000000-7f1d10021000 rw-p 00000000 00:00 0
7f1d10021000-7f1d14000000 ---p 00000000 00:00 0
7f1d1611a000-7f1d1611f000 r-xp 00000000 08:07 292
/lib/x86_64-linux-gnu/libnss_dns-2.24.so
7f1d1611f000-7f1d1631e000 ---p 00005000 08:07 292
/lib/x86_64-linux-gnu/libnss_dns-2.24.so
7f1d1631e000-7f1d1631f000 r--p 00004000 08:07 292
/lib/x86_64-linux-gnu/libnss_dns-2.24.so
7f1d1631f000-7f1d16320000 rw-p 00005000 08:07 292
/lib/x86_64-linux-gnu/libnss_dns-2.24.so
7f1d16320000-7f1d1632a000 r-xp 00000000 08:07 293
/lib/x86_64-linux-gnu/libnss_files-2.24.so
