Date: Fri, 25 Jul 2008 12:57:20 -0500 (CDT) From: "Sean C. Farley" <scf@FreeBSD.org> To: Chagin Dmitry <chagin.dmitry@gmail.com> Cc: Roman Divacky <rdivacky@FreeBSD.org>, freebsd-emulation@FreeBSD.org Subject: Re: kern/122318 (CMake core dumping, chroot exiting) Message-ID: <alpine.BSF.1.10.0807251231050.30805@thor.farley.org> In-Reply-To: <alpine.BSF.1.10.0807251233470.1710@ora.chd.net> References: <alpine.BSF.1.10.0807231236140.12600@thor.farley.org> <20080723184450.GA25356@freebsd.org> <alpine.BSF.1.10.0807231459030.12600@thor.farley.org> <alpine.BSF.1.10.0807240016340.28898@ora.chd.net> <alpine.BSF.1.10.0807231616570.12600@thor.farley.org> <20080725082156.GA41887@freebsd.org> <20080725083122.GA42835@freebsd.org> <alpine.BSF.1.10.0807251233470.1710@ora.chd.net>
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On Fri, 25 Jul 2008, Chagin Dmitry wrote: > On Fri, 25 Jul 2008, Roman Divacky wrote: >> On Fri, Jul 25, 2008 at 10:21:56AM +0200, Roman Divacky wrote: >>> On Wed, Jul 23, 2008 at 04:19:16PM -0500, Sean C. Farley wrote: >>>> On Thu, 24 Jul 2008, Chagin Dmitry wrote: >>>>> On Wed, 23 Jul 2008, Sean C. Farley wrote: >>>>>> On Wed, 23 Jul 2008, Roman Divacky wrote: >>>>>>> On Wed, Jul 23, 2008 at 12:50:51PM -0500, Sean C. Farley wrote: >>>>>>>> I am seeing if anyone has any insight on this PR >>>>>>>> (kern/122318[1]). It would be nice to once again build using >>>>>>>> cmake within a Linux chroot. :) >>>>>>>> >>>>>>>> Basically, the bug is that not only that cmake is dumping core; >>>>>>>> it is also forcing the user out of the chroot environment. >>>>>>>> Here is the command used to start the chroot: >>>>>>>> /compat/linux/usr/sbin/chroot <chroot path> su - <build user> >>>>>>>> >>>>>>>> 1. http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/122318 >>>>>>> >>>>>>> looking at the trace you provided I guess this is what's going on: >>>>>>> >>>>>>> cmake forks/execs gcc and waits to be notified about the success >>>>>>> of the command it tried, the notification comes (the SIGCHLD) >>>>>>> the handler tries do something and then returns and now >>>>>>> something is wrong and it receives the SIGSEGV.. >>>>>>> >>>>>>> or am I wrong and linux_ktrace does not translate signals and >>>>>>> the SIGCHLD is in fact SIGTSTP? >>>>>>> >>>>>>> what is the fd 3 and 4? can you provide full ktrace.out? >>>>>> >>>>>> I have the full output of the execution here using ktrace -d: >>>>>> http://www.farley.org/freebsd/tmp/cmake-kdump.txt >>>>> >>>>> hi! >>>>> >>>>> Please, can you run ktrace with -i flag? >>>>> >>>>> thnx! >>>> >>>> No problem. Same URL. The countless meetings this week are >>>> destroying my mind; I was thinking -d did what -i actually does. >>>> :) *snip of all that is wrong :)* >> erm... all wrong :) the gmake is a fbsd binary so its ok to open that >> file... > > yes, but I remember it was a question about chroot... I have the trouble in and out of the chroot (FC2-based) but also with linux_base-f{c4,c6,8}. I just ran it outside of the chroot to get the ktrace much more easily. This is on a FreeBSD 7 amd64 system running a 32-bit chroot. > Sean, can you provide full command which you run? Steps to recreate: mkdir a cd a touch CMakeLists.txt /home/sfarley/chroot/usr/bin/cmake . System setup for 7-STABLE as of July 14th: compat.ia32.maxvmem: 0 compat.ia32.maxssiz: 67108864 compat.ia32.maxdsiz: 536870912 compat.linux.oss_version: 198144 compat.linux.osrelease: 2.6.16 compat.linux.osname: Linux compat.linux32.maxvmem: 0 compat.linux32.maxssiz: 67108864 compat.linux32.maxdsiz: 536870912 BTW, switching to compat.linux.osrelease=2.4.2, running some Linux applications and switching back to 2.6.16 does not leave Linux emulation in a happy state. Simple Linux applications such as uname start core dumping. Sean -- scf@FreeBSD.org
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