Hi Bernd, Bernd Kuhls wrote, > Hi, > > investigating a segfault > > (gdb) bt full > #0 0x00007fffec28dd90 in __deregister_frame_info () from /lib/ > libgcc_s.so.1 > No symbol table info available. > #1 0x00007fffebf8af66 in __do_global_dtors_aux () from /usr/lib/ > libgcrypt.so.20 > > when starting Apache with mod_php activated on a buildroot-built x86_64- > system with uclibc-1.0.19 I came across discussions from 2012 & 2014 on > the uClibc mailinglist: > > 2012: > http://lists.uclibc.org/pipermail/uclibc/2012-October/047059.html > > 2014: > http://lists.busybox.net/pipermail/uclibc/2014-December/048737.html > > Building mod_php without libgcrypt.so, which means disabling > BR2_PACKAGE_PHP_EXT_XSL, does not fix the problem, the segfault will > occur in another shared lib. > > Quoting the message from 2014: > > > In my particular case, this meant dlopening and dlclosing some 47 > > shared objects as reported by "LD_DEBUG=1 /usr/bin/gdk-pixbuf-query- > > loaders ./libpixbufloader-svg.la 2>&1 | grep ^do_dlopen | grep ctors > > | wc -l" > > My system opens even more shared libs when starting Apache & mod_php: > > # LD_DEBUG=1 /usr/bin/httpd -t 2>&1 | grep ^do_dlopen | grep ctors | wc -l > 64 > Segmentation fault > > Please note that using Apache without mod_php works fine, php-cgi itself > also works fine. > > In 2014 Anthony suggested to revert > https://git.busybox.net/uClibc/commit/ldso? > h=0.9.33&id=9b42da7d0558884e2a3cc9a8674ccfc752369610 > > which still solves the Apache/mod_php segfault today. > > Uclibc-1.0.19 includes all commits from 2016-09-26 and older in > https://cgit.openadk.org/cgi/cgit/uclibc-ng.git/log/ldso/libdl > > it therefore includes https://cgit.openadk.org/cgi/cgit/uclibc-ng.git/ > commit/ldso/libdl?id=cc04ab27ba6341f46bbe094478c9af3e3706f411 which > refers to fix the problem from the 2012 message, but it did not.
Thanks for the detailed investigation. Indeed reverting the mentioned commit fixes also some long standing bug I have seen when executing "php -m" to list all modules installed in a system. (normally the ldap module generated the segfault in my case) I reverted the patch, this will be part of the next release. best regards Waldemar _______________________________________________ devel mailing list devel@uclibc-ng.org https://mailman.uclibc-ng.org/cgi-bin/mailman/listinfo/devel
