Date: Mon, 30 Apr 2012 16:13:26 +0200 From: =?ISO-8859-1?Q?Gustau_P=E9rez_i_Querol?= <gperez@entel.upc.edu> To: FreeBSD current <freebsd-current@freebsd.org> Cc: avilla@freebsd.org Subject: RFC: jemalloc: qdbus sigsegv in malloc_init Message-ID: <4F9E9E06.4070004@entel.upc.edu>
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Hi, the kde team is seeing some strange problems with the new version (4.8.1) of devel/dbus-qt4 with current. It does work with stable. I also suspect that the problem described below is affecting the experimental cinnamon port (an alternative to gnome3, possible replacement of gnome2). The problem happens with both i386 and amd64 with empty /etc/malloc.conf and simple /etc/make.conf. Everything compiled with base gcc (no clang). The kernel was compiled with no debug support, but it can enable if needed. There are reports from avilla@freebsd.org of the same behavior with clang compiled world and kernel and with MALLOC_PRODUCTION=yes. When qdbus starts, it segfauts. The backtrace of the problem with r234769 can be found here: http://pastebin.com/ryBXtqGF. When starting the qdbus daemon by hand in a X+twm session, we see it calls calloc many times and after a fixed number of times segfaults. We see it segfaults at rb_gen (a quite large macro defined at $SRC_BASE/contrib/jemalloc/include/jemalloc/internal/rb.h). If the daemon is started by hand, I'm able to skip all the calls qdbus makes to calloc till the one causing the segfault. At that point, at rb_gen, we don't exactly know what is going on or how to debug the macro. Ktrace are available, but we were unable to find anything new from them. With old versions of current before the jemalloc imports (as of March 30th) the daemon segfaulted at malloc.c:2426. With revisions during April 20 to 24th (can be more precise, it was during the jemalloc imports) the daemon segfaulted at malloc_init. Bts are available if needed, and if necessary I can go back to those revision and recompile world+kernel to see its behavior. Any help from freebsd-current@ (perhaps Jason Evans can help us) will be appreciated. Any additional info, like source revisions, can be provided. I would like to stress that the experimental devel/dbus-qt4 works fine with recent stable.
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