Re: Stuck kernel while cleaning up the object tree

Le Saturday 04 April 2009, Thierry Herbelot a écrit :
> 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 
_at_ /usr/src/sys/kerne/vfs_cache.c:974
panic: witness_warn
cpuid = 0
KDB: enter: panic

	TfH

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