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

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

---------- 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. 
 > >> 
 > >> -- 
 > >> Do not meddle in the internals of kernels, for they are subtle and quick to 
 > >>       
 > > 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

 > > 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