Date: Fri, 28 Aug 2015 16:16:02 +0200 From: Szabolcs Nagy <nsz@...t70.net> To: musl@...ts.openwall.com Subject: Re: _Unwind_Backtrace crashes * Alexander Monakov <amonakov@...ras.ru> [2015-08-28 16:21:08 +0300]: > I was able to reproduce this using the musl-gcc wrapper on a glibc-based > system. I tracked it down to dl_iterate_phdr callback in libgcc failing to > find PT_GNU_EH_FRAME header in this loop: > > https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libgcc/unwind-dw2-fde-dip.c;h=137dced8d558b9f786d935c8e4ab73200fb6409d;hb=HEAD#l267 > > And indeed adding -Wl,--eh-frame-hdr to the musl-gcc command line fixes it. > here the test works even without .eh_frame_hdr with gcc-5.1 (alpine, musl based toolchain). but i see the same failure with gcc-4.9.2 (debian, glibc based) and then --eh-frame-hdr fixes it. > Normally this ld option is present in built-in specs, but musl-gcc's specs > don't set it. > > Alexander
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