Date: Thu, 22 Jul 1999 17:57:23 -0500 (CDT) From: "Christopher W. Banek" <unixboy@imsa.edu> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: freebsd-smp@FreeBSD.ORG Subject: Re: Page Fault Problems with SMP kernel in 3.2-RELEASE Message-ID: <Pine.SOL.4.02.9907221755550.27378-100000@coke> In-Reply-To: <199907222220.PAA88210@apollo.backplane.com>
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On Thu, 22 Jul 1999, Matthew Dillon wrote: > :Hi. I am a a bit new to FreeBSD, came over from linux, but here is what > :is happening. I installed 3.2-RELEASE and everything went fine. I > :compilied an SMP kernel and now it page faults when ever I am doing > :something system intensive. It happens during configure scripts, but not > :when I do a make. But if I do a make -j2, it crashes quickly. > : > :Oh yeah, I have a GA-686LX2 with Dual PII/333 and 128MB of Ram. > > There's a good chance the problem has been fixed in FreeBSD-STABLE > (i.e. changes made since the 3.2 release), but it's hard to tell > from the information you provided. > > There are two ways to get additional information: > > * Try to get the kernel to generate a kernel core dump > > This involves having a swap area that is at least as large as > main memory. > > Setting the dumpdev in /etc/rc.conf correctly. If you have IDE > disks it might be something like I show below. Note that you > have to be careful to specify the correct partition name. Swap > partitions almost always end with 'b'. > > dumpdev="/dev/wd0b" > > Ensuring that /var/crash exists and has enough free space to hold > the dump (at least as much space as you have main memory, plus a > couple of megabytes more). You can make /var/crash a softlink to > some other partition if /var doesn't have enough space. For example > you can create a /usr/crash and then remove /var/crash and create > a softlink 'ln -s /usr/crash /var/crash'. > > Once these changes are made and you reboot, the next time the machine > crashes it should be able to generate a kernel core. You can then > gdb the core like this: > > cd /var/crash > ls -la > gdb -k kernel.0 vmcore.0 (or whatever > the names wind up being) > back (to get a backtrace) > > * Recompile the kernel with the DDB option turned on. Now when the > kernel crashes it will drop into a DDB> prompt and you should be > able to do a 'trace' to get a call stack backtrace from which we > may be able to get more information. (Then type 'panic' and hit > return a couple of times to panic the system). > > Recompiling the kernel for someone who has never done it before > can take a bit of work. > > > If the problem has already been solved you will have to learn how to > download the latest source dist in order to recompile a new kernel. > > Take a look at the FreeBSD documentation, especially the handbook. > See http://www.freebsd.org/ > > -Matt > Matthew Dillon > <dillon@backplane.com> > > :Here is the exact error message. > : > :Fatal trap 12: page fault while in kernel mode > :mp_lock = 01000002; cpuid=1; lapic.id=01000000 > :fault virtual address = 0x2b > :fault code = supervisor read, page not present > :instruction pointer = 0x8:0xc01cb3ab > :stack pointer = 0x10:0xc4a41e40 > :frame pointer = 0x10:0xc4a41e4c > :code segment = base 0x0, limit 0xfffff, type ox1b > : = DPL 0, pres1, def32, gran 1 > :processor eflags - interrupt enabled, resume,IOPL = 0 > :current process = 2800 (sh) > :inturrupt mask = net tty bio cam <- SMP: XXX > :trap number = 12 > :panic: page fault > :mp_lock = 01000002; cpuid = 1; lapic.id = 01000000 > :boot() called on cpu#1 > : > : > :Thanks for any help you guys can provide. > :Christopher Banek > : > : > : > : > :To Unsubscribe: send mail to majordomo@FreeBSD.org > :with "unsubscribe freebsd-smp" in the body of the message > : > I have done all of the things that you said, but when I recompiled the kernel with debugger support enabled, now it doesn't page fault, it just freezes with no messages at all. And no core dumps are being made. I am totally clueless about this one. Christopher Banek To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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