Date: Mon, 2 Feb 2009 21:36:59 -0800 From: Kip Macy <kmacy@freebsd.org> To: Kai Mosebach <xen@komadev.de> Cc: freebsd-xen@freebsd.org Subject: Re: Instable 32bit domU on 64bit dom0 (w/Xen 3.3.1) Message-ID: <3c1674c90902022136t48eef4faic3cc091082b68432@mail.gmail.com> In-Reply-To: <11276352.23661233243265678.JavaMail.root@zim.freshx.de> References: <11276352.23661233243265678.JavaMail.root@zim.freshx.de>
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Hi Kai,
This should be fixed by r188042. Interrupts need to be disabled on
entry to the page fault handler or we risk being preempted prior to
reading cr2 (the faulting address).
There is still another fundamental stability bug whereby timer
interrupts appear to sometimes be left disabled until another
interrupt (console, network, disk) comes in at which point they're
re-enabled. You may or may not hit that, I only have one configuration
where I'm able to reproduce that issue.
Cheers,
Kip
On Thu, Jan 29, 2009 at 7:34 AM, Kai Mosebach <xen@komadev.de> wrote:
> Hi,
>
> i recently got my first FreeBSD 8 domU working and i am quite happy to see that there is eventually progress on the important Xen topic for FreeBSD.
> Since this domU as a svn -head checkout from 23.01.09 still segfaults here and there i startet to rebuild the whole world with debugging symbols in the hope that the backtraces give more info's on where to find bugs.
>
> Here are the first results from several core files which hang around in the system after a world build and i hope the developers here can make more sense out of it than me.
>
> If you need further dumps/traces or have some advises how to go on from here, please let me know!
>
> Best Kai
>
> /usr/obj/usr/src/make.core
>
> Program terminated with signal 11, Segmentation fault.
> #0 0x0804da01 in Cmd_Exec (
> cmd=0x2812df00 "/usr/bin/env -i PATH=/sbin:/bin:/usr/sbin:/usr/bin make __MAKE_CONF=/etc/make.conf -f /dev/null -V MAKEOBJDIRPREFIX dummy",
> error=0xbf7fdb18) at /usr/src/usr.bin/make/job.c:2713
> 2713 if ((ps.child_pid = vfork()) == -1) {
> (gdb) bt
> #0 0x0804da01 in Cmd_Exec (
> cmd=0x2812df00 "/usr/bin/env -i PATH=/sbin:/bin:/usr/sbin:/usr/bin make __MAKE_CONF=/etc/make.conf -f /dev/null -V MAKEOBJDIRPREFIX dummy",
> error=0xbf7fdb18) at /usr/src/usr.bin/make/job.c:2713
> #1 0x080544ed in Parse_DoVar (line=0x28128b00 "_MAKEOBJDIRPREFIX",
> ctxt=0x2810e200) at /usr/src/usr.bin/make/parse.c:1520
> #2 0x08055a1a in Parse_File (name=0xbf7fdbf8 "/usr/src/Makefile",
> stream=0x80a4960) at /usr/src/usr.bin/make/parse.c:2457
> #3 0x08051e68 in ReadMakefile (p=Variable "p" is not available.
> ) at /usr/src/usr.bin/make/main.c:323
> #4 0x08051f24 in TryReadMakefile (p=0x8094744 "Makefile")
> at /usr/src/usr.bin/make/main.c:342
> #5 0x080527c3 in main (argc=1, argv=0xbf7feddc)
> at /usr/src/usr.bin/make/main.c:1209
> (gdb)
>
>
>
> /usr/src/sbin/atacontrol/sh.core
>
> Core was generated by `sh'.
> Program terminated with signal 11, Segmentation fault.
> Reading symbols from /lib/libedit.so.6...done.
> Loaded symbols for /lib/libedit.so.6
> Reading symbols from /lib/libncurses.so.7...done.
> Loaded symbols for /lib/libncurses.so.7
> Reading symbols from /lib/libc.so.7...done.
> Loaded symbols for /lib/libc.so.7
> Reading symbols from /libexec/ld-elf.so.1...done.
> Loaded symbols for /libexec/ld-elf.so.1
> #0 0x080555e6 in forkshell (jp=0x2830c0c0, n=0x28304d94, mode=0) at /usr/src/bin/sh/jobs.c:746
> 746 pid = fork();
> (gdb) bt
> #0 0x080555e6 in forkshell (jp=0x2830c0c0, n=0x28304d94, mode=0) at /usr/src/bin/sh/jobs.c:746
> #1 0x0804d759 in evalcommand (cmd=0x28304d94, flags=0, backcmd=0x0) at /usr/src/bin/sh/eval.c:747
> #2 0x0804e725 in evaltree (n=0x28304d94, flags=0) at /usr/src/bin/sh/eval.c:267
> #3 0x0804e4ff in evaltree (n=0x28304da4, flags=0) at /usr/src/bin/sh/eval.c:238
> #4 0x0804e86c in evaltree (n=0x28304210, flags=0) at /usr/src/bin/sh/eval.c:341
> #5 0x0804eba7 in evalstring (
> s=0xbf7fea84 "for entry in adjkerntz atacontrol atm badsect bsdlabel camcontrol ccdconfig clri comcontrol conscontrol ddb devd devfs dhclient dmesg dump dumpfs dumpon fdisk ffsinfo fsck fsck_"...) at /usr/src/bin/sh/eval.c:169
> #6 0x08056d98 in main (argc=3, argv=0xbf7fe9a8) at /usr/src/bin/sh/main.c:181
>
>
>
>
> /usr/obj/usr/src/libexec/ftpd/make.core
>
> Program terminated with signal 11, Segmentation fault.
> #0 0x080898bf in memset ()
> (gdb) bt
> #0 0x080898bf in memset ()
> #1 0x0000000c in ?? ()
> #2 0x0806f8b2 in arena_malloc ()
> #3 0x0807106b in malloc ()
> #4 0x0805a2d1 in emalloc (len=256) at /usr/src/usr.bin/make/util.c:234
> #5 0x08049d3f in Buf_Init (size=0) at /usr/src/usr.bin/make/buf.c:184
> #6 0x0805a63a in VarCreate (name=0x2810d118 ".CURDIR", value=0xbf7fe0b6 "/usr/src/libexec/ftpd", flags=0) at /usr/src/usr.bin/make/var.c:214
> #7 0x0805a68d in VarAdd (name=0x2810d118 ".CURDIR", val=0xbf7fe0b6 "/usr/src/libexec/ftpd", ctxt=0x28112180) at /usr/src/usr.bin/make/var.c:954
> #8 0x0805d2fc in Var_Set (name=0x809409d ".CURDIR", val=0xbf7fe0b6 "/usr/src/libexec/ftpd", ctxt=0x28112180) at /usr/src/usr.bin/make/var.c:1009
> #9 0x0805d321 in Var_SetGlobal (name=0x809409d ".CURDIR", value=0xbf7fe0b6 "/usr/src/libexec/ftpd") at /usr/src/usr.bin/make/var.c:1035
> #10 0x0805243f in main (argc=3, argv=0xbf7fed74) at /usr/src/usr.bin/make/main.c:1115
>
>
>
> /usr/obj/usr/src/usr.bin/telnet/as.core
>
> Program terminated with signal 11, Segmentation fault.
> #0 0x080480d6 in _start ()
> (gdb) bt
> #0 0x080480d6 in _start ()
> #1 0x00000003 in ?? ()
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