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

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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?

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?

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.



--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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