Date: Wed, 04 Feb 2009 11:20:33 +0100 From: Kai Mosebach <kai@freshx.de> To: Kip Macy <kmacy@freebsd.org> Cc: freebsd-xen@freebsd.org Subject: Re: Instable 32bit domU on 64bit dom0 (w/Xen 3.3.1) Message-ID: <C5AF2A81.39A1%kai@freshx.de> In-Reply-To: <3c1674c90902022136t48eef4faic3cc091082b68432@mail.gmail.com>
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Hi Kip, After rebuilding the kernel (which improved stability by roughly 80%) and rebuilding world (which improved stability by another 19% ;) the userland seems to be much more stable now! Kernel wise I hit the bug you described below at every bootup/shutdown and the first hit of a key on the console, but the system keeps running afterwards... Booting with 2 CPUs is still ending up in Spanic: blockable sleep lock (sleep mutex) XCONS LOCK @ dev/xen/console/console.c:290 cpuid = 1 KDB: enter: panic [thread pid 11 tid 100003 ] Stopped at kdb_enter+0x3a: movl $0,kdb_why Anyway, thanks for your effort! Kai On 2/3/09 6:36 AM, "Kip Macy" <kmacy@freebsd.org> wrote: > 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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