Re: [uml-devel] does 3.12.2 breaks UML with "con=xterm" ?

["Toralf Förster" <toralf.foerster@gmx.de>]

On 11/30/2013 03:51 PM, Richard Weinberger wrote:
> On Sat, Nov 30, 2013 at 3:43 PM, Toralf Förster <toralf.foerster@gmx.de> wrote:
>> On 11/30/2013 03:37 PM, Toralf Förster wrote:
>>>
>>> Today I realized that a UML cores if I use the xterm for the in/out.
>>>
>>> I do usually use "con0=fd:0,fd:1 con=pts" to start a 32bit UML but because the xterm way was fine during the past few weeks (yes, I know, it was broken for a longer time before) and the only change yesterday was to upgrade from vanilla kernel 3.12.1 to 3.12.2 I'm wondering if there's a "suspicous" commit in that stable kernel which could be the reason ?
>>>
>>>
>>> FWIW :
>>> tfoerste@n22 ~ $ gdb --core=/mnt/ramdisk/core /home/tfoerste/devel/linux/linux -n -batch -ex bt
>>> [New LWP 29559]
>>> Core was generated by `/home/tfoerste/devel/linux/linux earlyprintk ubda=/home/tfoerste/virtual/uml/tr'.
>>> Program terminated with signal 11, Segmentation fault.
>>> #0  finish_task_switch (prev=0xffff9d2f, rq=<optimized out>) at kernel/sched/core.c:1993
>>> 1993            prev_state = prev->state;
>>> #0  finish_task_switch (prev=0xffff9d2f, rq=<optimized out>) at kernel/sched/core.c:1993
>>> #1  0x08427418 in context_switch (next=<optimized out>, prev=0x46d9eecc, rq=<optimized out>) at kernel/sched/core.c:2130
>>> #2  __schedule () at kernel/sched/core.c:2568
>>> #3  0x08427505 in schedule () at kernel/sched/core.c:2604
>>> #4  0x0808b912 in sigsuspend (set=0x46d9eecc) at kernel/signal.c:3559
>>> #5  0x080646d8 in winch_thread (arg=0x46d9eecc) at arch/um/drivers/chan_user.c:210
>>> #6  0x083da38e in clone ()
>>>
>>>
>>
>> Pff - glibc was upgrade from 2.15-r3 to 2.16 too - /me hope, that it is
>> not glibc.
> 

I do believe that it is the glibc 2.16 upgrade.

> Please more details.
With 32 bit host kernel (3.12.1 and 3.12.2) and current tree of linus as guest kernel (tested older too:3.12, 3.11 ....) one of the linux processes crashes immediately using this start command :

/home/tfoerste/devel/linux/linux earlyprintk ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=1025M con=xterm umid=uml_trinity rootfstype=ext4


> Does it crash immediately?
yes, but it is "just" one (or more ?) of the processes, all other processes  continues, which gave later a lot of different error pictures/hangs when the UML image (stable 32 bit Gentoo linux) tries to start services during boot.

-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

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