Stuck kernel while cleaning up the object tree

[Kostik Belousov]

On Sun, Apr 05, 2009 at 12:13:09PM +0200, O. Hartmann wrote:
> Boris Samorodov wrote:
> > On Sat, 4 Apr 2009 11:51:17 +0200 Thierry Herbelot wrote:
> >   
> >> Le Saturday 04 April 2009, Thierry Herbelot a ?©crit :
> >>     
> >>> Hello,
> >>>
> >>> On recent -current machines, I have seen a common pattern, with the machine
> >>> being frozen (still responsive to pings, though) in the initial phases of
> >>> the buildworld procedure :
> >>>
> >>> example freeze :
> >>> --------------------------------------------------------------
> >>>
> >>>       
> >>>>>> stage 2.1: cleaning up the object tree
> >>>>>>             
> >>> --------------------------------------------------------------
> >>> cd /usr/src; MAKEOBJDIRPREFIX=/usr/obj  MACHINE_ARCH=i386  MACHINE=i386
> >>> CPUTYPE=  GROFF_BIN_PATH=/usr/obj/usr/src/tmp/legacy/usr/bin
> >>> GROFF_FONT_PATH=/usr/obj/usr/src/tmp/legacy/usr/share/groff_font
> >>> GROFF_TMAC_PATH=/usr/obj/usr/src/tmp/legacy/usr/share/tmac
> >>> _SHLIBDIRPREFIX=/usr/obj/usr/src/tmp  VERSION="FreeBSD 8.0-CURRENT i386
> >>> 800074"  INSTALL="sh /usr/src/tools/install.sh"
> >>> PATH=/usr/obj/usr/src/tmp/legacy/usr/sbin:/usr/obj/usr/src/tmp/legacy/usr/b
> >>> in:/usr/obj/usr/src/tmp/legacy/usr/games:/usr/obj/usr/src/tmp/usr/sbin:/usr/
> >>> obj/usr/src/tmp/usr/bin:/usr/obj/usr/src/tmp/usr/games:/sbin:/bin:/usr/sbin:
> >>> /usr/bin NO_CTF=1 make -f Makefile.inc1 DESTDIR=/usr/obj/usr/src/tmp
> >>> par-cleandir ===> share/info (cleandir)
> >>> ===> lib (cleandir)
> >>> ===> lib/csu/i386-elf (cleandir)
> >>> [type ^T in the console]
> >>> load: 0.00  cmd: sh 24587 [*Name Cache] 0.01u 0.00s 0% 1584k
> >>>
> >>> The other machines also froze while "cleaning up the object tree".
> >>>
> >>> The machines are configured with serial consoles : I have no kernel stack
> >>> backtrace to aid in pinpointing the cause of this freeze.
> >>>
> >>> 	Cheers
> >>>
> >>> 	TfH
> >>>       
> >
> >   
> >> With a bit more investigation :
> >>     
> >
> >   
> >> on a separate ssh session, top is still live and shows processes stuck as :
> >> 24523 root             1  76    0  1888K   764K *Name   1   0:00  0.00% make
> >>     
> >
> >   
> >> on still another machine, running Witnesses (all other machines run with a 
> >> lean GENERIC, with most of the debuging features commented out) :
> >> System call __getcwd returning with the following locks held:
> >> shared rw Name Cache (Name Cache) r = 0 (0xc0ee7e1c) locked 
> >> @ /usr/src/sys/kerne/vfs_cache.c:974
> >>     
> >
> > This is definitely related to:
> > SVN rev 190655 on 2009-04-02 21:16:20Z by peter
> > (peter@ CCed)
> >
> >   
> >> panic: witness_warn
> >> cpuid = 0
> >> KDB: enter: panic
> >>     
> >
> >
> > WBR
> >   
> Is there a fix in sight soon? I do have this error/fault/lockup now on
> ALL FreeBSD 8.0-CURRENT/amd64 machines I have.

The commit was reverted yesterday.
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