Hi,
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).
Sounds great. I will try to test it as soon as possible, since I ran in
a lot of seg-faults during compiling world under Xen, too.
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.
Sounds like the problem I gave up using FreeBSD7 in Xen. My domU halted
(does nothing but was running, even SSH sessions timed out) sometimes
and the only way to get it back to work, was to hit a key on the
console.
I did a temporary fix by 'while (true); do echo e; sleep 10s; done |
xm console domU_name.
--
Mr. Olli
Cheers,
Kip
On Thu, Jan 29, 2009 at 7:34 AM, Kai Mosebach x...@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
2713if ((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 fdiskffsinfo 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 0x000c 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
