Hi, The problem is malloc(0) return !NULL, and the newest version of uclibc-ng-test is OK. Thx for your buildroot patch. Best Regards ----------- Guo Ren, Software Engineer, C-SKY 3 XiDoumen Rd,BldgA,15F,Hangzhou,China P.C: 310012T: +86 13376814331M: ren_guo(a)c-sky.com http://www.c-sky.comhttps://c-sky.github.io ------------------------------------------------------------------From:Waldemar Brodkorb <wbx@uclibc-ng.org>Time:2017 Aug 29 (Tue) 12:33To:郭任 <ren_guo@c-sky.com>Cc:Waldemar Brodkorb &lt;wbx(a)uclibc-ng.org&gt;rg>; devel-uclibc-ng <devel@uclibc-ng.org>Subject:Re: buildroot uclibc-ng-test package need update Hi, 郭任 wrote, I don't remember any changes in this area. I have sent an updated patch to br mailinglist. But it's not tst-mallocfork test? Because this fails for any architecture since the combination of librt/libpthread/libm/.. into libc. best regards  Waldemar