Date: Fri, 17 Jun 2005 17:56:45 -0400 From: Eric Millbrandt <emillbrandt@coldhaus.com> To: John Baldwin <jhb@FreeBSD.org> Cc: freebsd-alpha@FreeBSD.org Subject: Re: Kernel trap on linux compat load Message-ID: <42B3471D.7050608@coldhaus.com> In-Reply-To: <200506170924.32120.jhb@FreeBSD.org> References: <42AA1C23.4080901@coldhaus.com> <200506151535.59989.jhb@FreeBSD.org> <42B217A1.3060002@coldhaus.com> <200506170924.32120.jhb@FreeBSD.org>
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[-- Attachment #1 --] John Baldwin wrote: >On Thursday 16 June 2005 08:21 pm, Eric Millbrandt wrote: > > >>John Baldwin wrote: >> >> >>>On Friday 10 June 2005 07:02 pm, Eric Millbrandt wrote: >>> >>> >>>>I've noticed that linux compatibility caused my system to crash since I >>>>upgraded from RELENG_4_9 (RELENG_4_10, RELENG_4_11, RELENG_4). I >>>>upgraded using buildworld, I haven't had a change to test using a clean >>>>binary install. Has anyone else seen this behavior? It's easy to >>>>reproduce, the system traps right on linux compatibility load. The only >>>>similar behavior I've found on google is an unanswered post >>>>http://lists.freebsd.org/pipermail/freebsd-alpha/2004-June/001555.html >>>> >>>>Jun 8 07:18:17 mongoloid /kernel: fatal kernel trap: >>>>Jun 8 07:18:17 mongoloid /kernel: >>>>Jun 8 07:18:17 mongoloid /kernel: trap entry = 0x4 (unaligned access >>>>fault) Jun 8 07:18:17 mongoloid /kernel: a0 = 0xfffffe0015285e34 >>>>Jun 8 07:18:17 mongoloid /kernel: a1 = 0x2d >>>>Jun 8 07:18:17 mongoloid /kernel: a2 = 0x1 >>>>Jun 8 07:18:17 mongoloid /kernel: pc = 0xfffffc0000386e68 >>>>Jun 8 07:18:17 mongoloid /kernel: ra = 0xfffffc0000386dd8 >>>>Jun 8 07:18:17 mongoloid /kernel: curproc = 0xfffffe001177e780 >>>>Jun 8 07:18:17 mongoloid /kernel: pid = 173, comm = ldconfig >>>>Jun 8 07:18:17 mongoloid /kernel: >>>>Jun 8 07:18:17 mongoloid /kernel: panic: trap >>>> >>>>EEM >>>> >>>> >>>Did you rebuild your kernel with buildkernel / installkernel? I believe >>>that buildworld on 4.x still builds and installs new modules into >>>/modules including the linux and osf1 compat modules. New modules aren't >>>guaranteed to work on older kernels, so if your kernel is still 4.9, that >>>is probably your problem. >>> >>> >>I used buildworld, buildkernel, installkernel, drop to single user, >>installworld, and mergemaster. This is with linux_compat loading from >>rc.conf. I misspoke earlier loading linux.ko works fine but running a >>linux binary, /compat/linux/sbin/ldconfig or sophie, causes the trap. >>On a side not osf1_compat works fine. >> >>Here are my stack traces after running /compat/linux/sbin/ldconfig... >>Debugger() at Debugger=0x2c >>panic() at panic+0x100 >>trap() at trap+0x600 >>XentUna() at XentUna+0x2c >>--- unaligned access fault (from ipl0) --- >>kernel_sysctl at kernel_sysctl+ox1a8 >>347() at -0x1fffe4a63d0 >>Here ddb traps on itself (memory management fault) >> >>This one is from running sophie >>Debugger() at Debugger=0x2c >>panic() at panic+0x100 >>trap() at trap+0x600 >>XentUna() at XentUna+0x2c >>--- unaligned access fault (from ipl0) --- >>kernel_sysctl at kernel_sysctl+ox1a8 >>linux_newuname() at linux_newuname+0xd0 >>syscall() at syscal+0x224 >>XentSys at XentSys+0x5c >>--- syscall (339, Linux ELF, linux_newuname) --- >>--- user mode --- >> >> > >Ok, this is helpful. Can you do 'gdb kernel.debug' and then type 'list >*kernel_sysctl+0x1a8'? This will give us the source file/line that it >faulted at. Thanks! > > > Ok here is what I found. 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