Re: [uml-devel] [PATCH v3] um: Switch clocksource to hrtimers

[Richard Weinberger <richard@nod.at>]

Am 02.11.2015 um 15:30 schrieb Anton Ivanov:
> On 02/11/15 10:01, Richard Weinberger wrote:
>> Am 02.11.2015 um 10:53 schrieb Anton Ivanov:
>>> [snip]
>>>
>>>>>> I'm pretty sure that you don't see the issue as your Jessy userspace uses nanosleep periodically.
>>>>> There are quite a few things running so this may indeed be the case.
>>>>>
>>>>> What do you use for userspace (so I can try to reproduce this and debug it)?
>>>> Debian Squeeze amd64 with almost nothing running.
>>>>
>>>>     PID TTY      STAT   TIME COMMAND
>>>>       2 ?        S      0:00 [kthreadd]
>>>>       3 ?        S      0:00  \_ [ksoftirqd/0]
>>>>       4 ?        S      0:00  \_ [kworker/0:0]
>>>>       5 ?        S<     0:00  \_ [kworker/0:0H]
>>>>       6 ?        S      0:00  \_ [kworker/u2:0]
>>>>       7 ?        S      0:00  \_ [kdevtmpfs]
>>>>       8 ?        S<     0:00  \_ [netns]
>>>>       9 ?        S<     0:00  \_ [writeback]
>>>>      10 ?        S      0:00  \_ [kworker/u2:1]
>>>>      11 ?        S<     0:00  \_ [crypto]
>>>>      12 ?        S      0:00  \_ [kworker/0:1]
>>>>      13 ?        S<     0:00  \_ [bioset]
>>>>      14 ?        S<     0:00  \_ [kblockd]
>>>>      15 ?        S      0:00  \_ [kswapd0]
>>>>      68 ?        S      0:00  \_ [fsnotify_mark]
>>>>     221 ?        S<     0:00  \_ [bioset]
>>>>     229 ?        S<     0:00  \_ [deferwq]
>>>>     231 ?        S      0:00  \_ [jbd2/ubda-8]
>>>>     232 ?        S<     0:00  \_ [ext4-rsv-conver]
>>>>     233 ?        S<     0:00  \_ [kworker/0:1H]
>>>>       1 ?        Ss     0:00 init [2]
>>>>     271 ?        S<s    0:00 udevd --daemon
>>>>     297 ?        S<     0:00  \_ udevd --daemon
>>>>     298 ?        S<     0:00  \_ udevd --daemon
>>>>     549 ?        Sl     0:00 /usr/sbin/rsyslogd -c4
>>>>     580 ?        Ss     0:00 /usr/sbin/cron
>>>>     595 ?        Ss     0:00 /usr/bin/dbus-daemon --system
>>>>     609 ?        Ss     0:00 /usr/sbin/sshd
>>>>     628 tty0     Ss     0:00 /bin/login --
>>>>     631 tty0     S      0:00  \_ -bash
>>>>     636 tty0     R+     0:00      \_ ps fax
>>>>     629 tty1     Ss+    0:00 /sbin/getty 38400 tty1 linux
>>>>     630 ttyS0    Ss+    0:00 /sbin/getty 115200 ttyS0 linux
>>> I cannot reproduce that by dropping jessie into single user mode so I am going to build a squeeze image and re-test with that.
>> I can also reproduce using init=/bin/bash.
> 
> Reproduced, I think I located the culprit.
> 
> We still need to relay the "interruption" signal which broke a nanosleep.
> 
> I am testing a fix, which so far is working. If the fix proves viable, I will test it as above (init=/bin/bash) and the normal tests I usually do anyway.
> 
> If it works OK, I will submit v4.

Yay!

Thanks,
//richard the QA engineer ;)

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