Re: Gentoo guest with smp: emerge freeze while recompile world

["Riccardo" <andrighetto.riccardo@gmail.com>]

---------- Original Message ----------- 
 From: Brian Jackson <iggy@theiggy.com> 
 To: "Riccardo" <andrighetto.riccardo@gmail.com> 
 Cc: kvm@vger.kernel.org 
 Sent: Fri, 21 May 2010 11:35:36 -0500 
 Subject: Re: Gentoo guest with smp: emerge freeze while recompile world

> On Friday, May 21, 2010 10:46:10 am Riccardo wrote: 
> > ---------- Original Message ----------- 
> >  From: Avi Kivity <avi@redhat.com> 
> >  To: Riccardo <andrighetto.riccardo@gmail.com> 
> >  Cc: kvm@vger.kernel.org 
> >  Sent: Fri, 21 May 2010 18:21:20 +0300 
> >  Subject: Re: Gentoo guest with smp: emerge freeze while recompile world 
> > 
> >  > On 05/21/2010 04:16 PM, Riccardo wrote: 
> >  > > ... 
> >  > > 
> >  > >> There are almost impossible to debug. 
> >  > >> 
> >  > >> Try copying vmlinux out of your guest and attach with gdb when it 
> >  > >> hangs.  Then issue the command 
> >  > >> 
> >  > >>    (gdb) thread apply all backtrace 
> >  > >> 
> >  > >> to see what the guest is doing. 
> >  > > 
> >  > > panic. 
> >  > > ------- End of Original Message ------- 
> >  > > 
> >  > > Hi, 
> >  > > I compile gentoo-sources-2.6.31-r10 and with this kernel "emerge -e 
> >  > > world" complete without errors! 
> >  > 
> >  > Interesing.  Can you so a git bisect to see where it stops working? 
> > 
> >  Ehm sorry I don't understand the request have you a link? 
> > 
> >  > > I always use the same .config 
> >  > > 
> >  > > After I try gentoo-sources-2.6.34 and vanilla-sources-2.6.34 but the 
> >  > > problem remain, the compile freeze and I see this in ps -elf: 
> >  > > 
> >  > > 5 S root      1013     1  0   76  -4 -  3125 poll_s 13:00 ?       
> >  > > 00:00:00 /sbin/udevd --daemon 
> >  > > 1 S root      2669     1  0   80   0 -  7523 wait   13:00 ?       
> >  > > 00:00:00 supervising syslog-ng 
> >  > > 5 S root      2670  2669  0   80   0 -   7556 poll_s 13:00 ?       
> >  > > 00:00:00 /usr/sbin/syslog-ng 
> >  > > 1 S root      3258     1  0   80   0 -  9505 poll_s 13:00 ?       
> >  > > 00:00:00 /usr/sbin/sshd 
> >  > > 1 S root      3378     1  0   80   0 -  4115 hrtime 13:00 ?       
> >  > > 00:00:00 /usr/sbin/cron 
> >  > > 0 S root      3446     1  0   80   0 -  1493 n_tty_ 13:00 tty2     
> >  > > 00:00:00 /sbin/agetty 38400 tty2 linux 
> >  > > 0 S root      3447     1  0   80   0 -  1493 n_tty_ 13:00 tty3     
> >  > > 00:00:00 /sbin/agetty 38400 tty3 linux 
> >  > > 0 S root      3448     1  0   80   0 -  1493 n_tty_ 13:00 tty4     
> >  > > 00:00:00 /sbin/agetty 38400 tty4 linux 
> >  > > 0 S root      3449     1  0   80   0 -  1493 n_tty_ 13:00 tty5     
> >  > > 00:00:00 /sbin/agetty 38400 tty5 linux 
> >  > > 0 S root      3450     1  0   80   0 -  1493 n_tty_ 13:00 tty6     
> >  > > 00:00:00 /sbin/agetty 38400 tty6 linux 
> >  > > 5 S root      3457     1  0   80   0 -  5959 poll_s 13:00 ?       
> >  > > 00:00:00 SCREEN -S sb1 
> >  > > 4 S root      3458  3457  0   80   0 -   4454 wait   13:00 pts/0   
> >  > > 00:00:00 -/bin/bash 
> >  > > 4 S root      3462  3458  0   75  -5 - 45171 poll_s 13:00 pts/0   
> >  > > 00:00:34 /usr/bin/python2.6 /usr/bin/emerge -e world 
> >  > > 4 S root      3613     1  0   80   0 - 14014 wait   13:01 tty1     
> >  > > 00:00:00 /bin/login -- 
> >  > > 4 S root      3953  3613  0   80   0 -   4429 n_tty_ 13:01 tty1 
> > 
> >  00:00:00 -bash 
> > 
> >  > > 0 S root      6614  3462  0   75  -5 -   972 wait   14:26 pts/0   
> >  > > 00:00:00 [dev-util/pkgconfig-0.23] sandbox 
> >  > > "/usr/lib64/portage/bin/ebuild.sh" compile 4 S root      6615  6614 
> >  > > 0  75  -5 -   6362 wait   14:26 pts/0    00:00:00 /bin/bash 
> >  > > /usr/lib64/portage/bin/ebuild.sh compile 
> >  > > 5 S root      6646  6615  0   75  -5 -   6745 wait   14:26 pts/0   
> >  > > 00:00:00 /bin/bash /usr/lib64/portage/bin/ebuild.sh compile 
> >  > > 4 S root     13235  6646  0  75   -5 -   3651 wait   14:27 pts/0   
> >  > > 00:00:00 make -j8 
> >  > > 4 S root     13238 13235  0  75   -5 -  3652 wait   14:27 pts/0   
> >  > > 00:00:00 make all-recursive 
> >  > > 4 S root     13239 13238  0  75   -5 -  5956 wait   14:27 pts/0   
> >  > > 00:00:00 /bin/sh -c set fnord $MAKEFLAGS; amf=$2; \?dot_seen=no; 
> >  > > \?target=`echo all-recursive | sed s/-recursive//`; \?list= 
> >  > > 5 S root     13243 13239  0  75   -5 -  5956 wait   14:27 pts/0   
> >  > > 00:00:00 /bin/sh -c set fnord $MAKEFLAGS; amf=$2; \?dot_seen=no; 
> >  > > \?target=`echo all-recursive | sed s/-recursive//`; \?list= 
> >  > > 4 S root     13244 13243  0  75   -5 -  3686 wait   14:27 pts/0   
> >  > > 00:00:00 make all 
> >  > > 4 S root     13358 13244  0  75   -5 -  3684 wait   14:27 pts/0   
> >  > > 00:00:00 make all-recursive 
> >  > > 4 S root     13359 13358  0  75   -5 -  5956 wait   14:27 pts/0   
> >  > > 00:00:00 /bin/sh -c set fnord $MAKEFLAGS; amf=$2; \?dot_seen=no; 
> >  > > \?target=`echo all-recursive | sed s/-recursive//`; \?list= 
> >  > > 5 S root     16546 13359  0  75   -5 -  5956 wait   14:28 pts/0   
> >  > > 00:00:00 /bin/sh -c set fnord $MAKEFLAGS; amf=$2; \?dot_seen=no; 
> >  > > \?target=`echo all-recursive | sed s/-recursive//`; \?list= 
> >  > > 4 S root     16547 16546  0  75   -5 -  3652 wait   14:28 pts/0   
> >  > > 00:00:00 make all 
> >  > > 4 S root     16548 16547  0  75   -5 -  3652 n_tty_ 14:28 pts/0   
> >  > > 00:00:00 make all-am 
> >  > > 4 S root     16599  3258  0  80   0 - 17937 poll_s 15:07 ?       
> >  > > 00:00:00 sshd: root@pts/2 
> >  > > 4 S root     16602 16599  0  80   0 -  4429 wait   15:07 pts/2   
> >  > > 00:00:00 
> > 
> >  -bash 
> > 
> >  > > 4 R root     16611 16602  0  80   0 -  3698 -      15:08 pts/2   
> >  > > 00:00:00 
> > 
> >  ps -elf 
> > 
> >  > > 1 S root     31506     2  0   80   0 -     0 bdi_wr 14:25 ?       
> >  > > 00:00:00 [flush-253:0] 
> >  > > 
> >  > > All in wait? 
> >  > 
> >  > Maybe a block driver problem?  Are you using virtio? 
> > 
> >  Yes, I always used virtio. 
> >  In the server the kernel is sys-kernel/gentoo-sources-2.6.33 
> >  and in dmesg I see this new lines about clock?: 
> >  [  885.500098] CE: hpet increasing min_delta_ns to 15000 nsec 
> >  [ 1354.020020] CE: hpet increasing min_delta_ns to 22500 nsec 
> >  [ 2657.777387] hrtimer: interrupt took 7542 ns 
> >  [ 7148.533547] CE: hpet increasing min_delta_ns to 33750 nsec 
> 
> If you are using kvm-clock, maybe try disabling that. 
> 
$ cat /sys/devices/system/clocksource/clocksource0/current_clocksource
hpet

This is from server, not from VM (that have freeze).
> > 
> >  > > After this test I reboot in 2.6.31-r10 and I complete emerge -e world 
> > 
> >  succefully. 
> > 
> >  > > The problem show always with all kernels>=2.6.32 
> >  > > I have setup something wrong in kernel? I post the .config in the 
> >  > > previous 
> > 
> >  email. 
> > 
> >  > It should work for all .configs. 
> > 
> >  Thanks for your checks. 
> > 
> >  ------- End of Original Message ------- 
> >  Now I have leave the VM freeze. 
> >  If you can debug I can send you the data for connect to the VM. 
> > 
> >  Riccardo 
> > -- 
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------- End of Original Message -------