Date: Thu, 10 Sep 2009 14:02:09 +0100 From: Vincent Hoffman <vince@unsane.co.uk> To: Kostik Belousov <kostikbel@gmail.com> Cc: freebsd-stable@freebsd.org, John Baldwin <jhb@freebsd.org> Subject: Re: general protection fault on boot. Message-ID: <4AA8F8D1.409@unsane.co.uk> In-Reply-To: <20090910112850.GG47688@deviant.kiev.zoral.com.ua> References: <4AA7D8B3.1010203@unsane.co.uk> <200909091339.00193.jhb@freebsd.org> <20090909190228.GC47688@deviant.kiev.zoral.com.ua> <4AA8D62F.1020901@unsane.co.uk> <20090910112850.GG47688@deviant.kiev.zoral.com.ua>
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Kostik Belousov wrote: > On Thu, Sep 10, 2009 at 11:34:23AM +0100, Vincent Hoffman wrote: > >> Kostik Belousov wrote: >> >>> On Wed, Sep 09, 2009 at 01:38:59PM -0400, John Baldwin wrote: >>> >>> >>>> On Wednesday 09 September 2009 12:32:51 pm Vincent Hoffman wrote: >>>> >>>> >>>>> Hi all, >>>>> I've been running the 8.0-BETAs in a xen virtual machine >>>>> (hvm/fully virtualised) for testing and something between r196730 and >>>>> r196746 causes a general protection fault on boot. I'll try and narrow >>>>> it down if i get a chance but I'm a a bit busy at the moment. >>>>> >>>>> backtrace is available at >>>>> http://unsane.co.uk/~jhary/freebsd/GPF-09-09-09.gif >>>>> Xen dom0 is a centos5.3 box using the xen-3.3.1 rpms from >>>>> http://www.gitco.de/linux/i386/centos/5/rpms/ if thats of any use. >>>>> >>>>> Let me know if I need to provide any more info. >>>>> >>>>> >>>> Hmm, can you try reverting 196737? Or actually, can you print out the value >>>> of %ebx ('p $ebx' in ddb will work I think)? I wonder if this patch would >>>> fix it: >>>> >>>> Index: pmap.c >>>> =================================================================== >>>> --- pmap.c (revision 196974) >>>> +++ pmap.c (working copy) >>>> @@ -999,7 +999,7 @@ >>>> * coherence domain. >>>> */ >>>> mfence(); >>>> - for (; sva < eva; sva += cpu_clflush_line_size) >>>> + for (; sva <= eva; sva += cpu_clflush_line_size) >>>> clflush(sva); >>>> mfence(); >>>> } else { >>>> >>>> >>> Oh, no, another pointy hat to me :(. >>> >>> Please, try this patch instead. >>> >>> diff --git a/sys/i386/xen/pmap.c b/sys/i386/xen/pmap.c >>> index 4b81aae..122318c 100644 >>> --- a/sys/i386/xen/pmap.c >>> +++ b/sys/i386/xen/pmap.c >>> @@ -1004,8 +1004,8 @@ pmap_invalidate_cache_range(vm_offset_t sva, vm_offset_t eva) >>> * coherence domain. >>> */ >>> mfence(); >>> - for (; eva < sva; eva += cpu_clflush_line_size) >>> - clflush(eva); >>> + for (; sva < eva; sva += cpu_clflush_line_size) >>> + clflush(sva); >>> mfence(); >>> } else { >>> >>> >>> >> Hi, >> I tried this this morning with no joy i'm afraid. >> not much change but new backtrace (with p $ebx) at >> http://www.unsane.co.uk/~jhary/freebsd/10-09-09.gif >> > I would need the panic message and ddb lines that are not > present on your screenshot. > > Also, the dmesg is interesting (CPU features report). > Sorry, did need more coffee after all then. http://unsane.co.uk/~jhary/freebsd/gpf-10-09-09-1.gif http://unsane.co.uk/~jhary/freebsd/gpf-10-09-09-2.gif http://unsane.co.uk/~jhary/freebsd/dmesg.boot like I said, Console access via vnc is available if wanted. Vince >> Just to check I'm not in need of more coffee as i'm still learning svn >> (and my coding skills such as they are lie in shell and perl) >> >> krill# svn info >> Path: . >> URL: svn://svn.freebsd.org/base/stable/8 >> Repository Root: svn://svn.freebsd.org/base >> Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f >> Revision: 196740 >> Node Kind: directory >> Schedule: normal >> Last Changed Author: rnoland >> Last Changed Rev: 196737 >> Last Changed Date: 2009-09-01 17:41:28 +0100 (Tue, 01 Sep 2009) >> >> >> krill# sed -n '1010,1017p' sys/i386/xen/pmap.c >> * coherence domain. >> */ >> mfence(); >> for (; sva < eva; sva += cpu_clflush_line_size) >> clflush(sva); >> mfence(); >> } else { >> >> krill# >> >> Happy to give vnc access to the console of the machine if that would help. >> >> Vince >>
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