rebooting during starting up qt application

Forum: Linux
blue 
hi all

some times (only after switch power-on), there is rebooting problem (only
one time) during starting up qt application on mini2440 with linux-2.6.32.2


I don't use watchdog.

If I close and run qt application, I will never see rebooting. It occurs
only after first run (after power-on switch of mini2440). It seems that
some chipset needs software rebooting after power-up during first run of qt
application. qDebug showes that It does not occur in a specific code of qt
application. nor see and kernel error on com1 debug texts.

I will be appreciated with your comments and suggestions.

blue

cazzenberg 
Qt version?

Out of RAM memory?

blue 
thanks

the size of static compiled qt app is 14MB 
the app deifnes less than 13MB data array in RAM
when running linux-2.6.32.2

the size of RAM of mini2440 is 64 MB.

how can I test the idea of "Out of RAM memory"?

blue 
Qt Version is 4.8.0

blue 
I recompiled eveything with -shared configuration. Now qt app size is about
850 Kb with more than 15MB shared dll files.
The problem still exists.

Is it related to a linux OS bug?

blue 
There is no difference in RAM usage when I compile it with qt4.6.3 or
qt4.8.0

Both qt versions have configured and cross compiled (static) with only
necessary modules (I can not disable QNetwork module)

Extra widgets has removed from tabs/form.

ps and top commands show that my qt application use about 50MB RAM.

The problem still exists.

Applications of Qt developers, here, are consume about 50MB RAM without
rebooting problem?

thanks for your time

Juergen Beisert 
Search the web for 'overcommitment'. Maybe you can play with its setting
and see what happens ('overcommit_memory' and 'overcommit_ratio' entries in
'/proc/sys/vm/')
Read the Documentation/vm/overcommit-accounting for more information about
their values.

Eleandro 
Hi Blue,
I have the same problem. 
Did you find a solution? I'd appreciate if you can share.

Thanks

blue 
I did the following change, but the problem till exists.

in mmap.c

int sysctl_overcommit_memory = OVERCOMMIT_NEVER;  /* heuristic overcommit
*/ //todo: it was OVERCOMMIT_GUESS
int sysctl_overcommit_ratio = 99;  /* default is 50% */

arges 
Hi eall,
anybody that solves the problem?...

arges 
Hi all,
in addition, Kernel print the information: "s3c2410-wdt s3c2410-wdt:
Unexpected close, not stopping watchdog".

mocugo 
Hi Arges,

Add this line to the rcS file;

echo -n V > /dev/watchdog

arges 
mocugo, thanks.

blue 
I did the following change, but the problem till exists.

in mmap.c & nommu.c
int sysctl_overcommit_memory = OVERCOMMIT_NEVER;  /* heuristic overcommit
*/ //todo: it was OVERCOMMIT_GUESS
int sysctl_overcommit_ratio = 99;  /* default is 50% */


I will be appreciated with any cooment & suggestion from professionals

blue 
is 50MB a normal ram usage for Qt application or my qApp has memory leak?

davef 
I tried running Arora and even the demo/browser, just out of RAM (64M
machine) and had to go to using an SD card and swap.

Are you running Webkit?

blue 
No
I only have linux and qt application on mini2440. There is sd card for data
storage but does not used for swap.
this is a top command view:

Mem: 42248K used, 19424K free, 0K shrd, 0K buff, 18876K cached
CPU:  3.7% usr  8.1% sys  0.0% nic 86.8% idle  0.0% io  1.1% irq  0.0% sirq
Load average: 0.31 0.25 0.12 1/30 423
  PID  PPID USER     STAT   VSZ %MEM CPU %CPU COMMAND
  339     2 root     SW       0  0.0   0  7.3 [s3c2410-spi.0]
  410   379 root     S    48640 78.3   0  3.9 ./qt-gui -qws 
  422   419 root     R     3392  5.4   0  0.4 top 
  419   418 root     S     3392  5.4   0  0.0 -sh 
  402     1 root     S     3388  5.4   0  0.0 /usr/sbin/inetd 
  418   402 root     S     3076  4.9   0  0.0 /usr/sbin/telnetd -i 
  379     1 root     S     3072  4.9   0  0.0 /bin/sh /etc/init.d/rcS 
    1     0 root     S     3068  4.9   0  0.0 init     
  399     1 root     S     3068  4.9   0  0.0 syslogd 
    5     2 root     SW       0  0.0   0  0.0 [khelper]
    4     2 root     SW       0  0.0   0  0.0 [events/0]
    2     0 root     SW       0  0.0   0  0.0 [kthreadd]
    3     2 root     SW       0  0.0   0  0.0 [ksoftirqd/0]
   11     2 root     SW       0  0.0   0  0.0 [async/mgr]
  115     2 root     SW       0  0.0   0  0.0 [sync_supers]
  117     2 root     SW       0  0.0   0  0.0 [bdi-default]
  119     2 root     SW       0  0.0   0  0.0 [kblockd/0]
  123     2 root     SW       0  0.0   0  0.0 [kseriod]
  129     2 root     SW       0  0.0   0  0.0 [kmmcd]
  144     2 root     SW       0  0.0   0  0.0 [rpciod/0]

davef 
42248K used and 48640 (78.3%) just for ./qt-gui doesn't add up . . . well
it doesn't to me.

How much room did you leave for the kernel?

I recall doing free before and after running Arora, seeing less than 60M
and then running out of RAM.  I was told "that other stuff gets dragged-in
to run the application".  Not a good explanation as he didn't say where it
came from!

blue 
this is TOP COMMAND results !

after closing qt-gui

Mem: 41712K used, 19960K free, 0K shrd, 0K buff, 21448K cached
CPU:  0.1% usr  0.3% sys  0.0% nic 99.4% idle  0.0% io  0.0% irq  0.0% sirq
Load average: 0.01 0.15 0.21 1/29 461
  PID  PPID USER     STAT   VSZ %MEM CPU %CPU COMMAND
  461   419 root     R     3392  5.4   0  0.5 top 
  419   418 root     S     3392  5.4   0  0.0 -sh 
  402     1 root     S     3388  5.4   0  0.0 /usr/sbin/inetd 
  418   402 root     S     3076  4.9   0  0.0 /usr/sbin/telnetd -i 
    1     0 root     S     3068  4.9   0  0.0 init     
  399     1 root     S     3068  4.9   0  0.0 syslogd 
  440     1 root     S     3068  4.9   0  0.0 init     
  441     1 root     S     3068  4.9   0  0.0 init     
  442     1 root     S     3068  4.9   0  0.0 init     
  446     1 root     S     3068  4.9   0  0.0 init     
  339     2 root     SW       0  0.0   0  0.0 [s3c2410-spi.0]
    5     2 root     SW       0  0.0   0  0.0 [khelper]
    4     2 root     SW       0  0.0   0  0.0 [events/0]
    2     0 root     SW       0  0.0   0  0.0 [kthreadd]
    3     2 root     SW       0  0.0   0  0.0 [ksoftirqd/0]
   11     2 root     SW       0  0.0   0  0.0 [async/mgr]
  115     2 root     SW       0  0.0   0  0.0 [sync_supers]
  117     2 root     SW       0  0.0   0  0.0 [bdi-default]
  119     2 root     SW       0  0.0   0  0.0 [kblockd/0]
  123     2 root     SW       0  0.0   0  0.0 [kseriod]

blue 
here a simple bash file used for running qt-gui. but even without bash
file, the top command result for memory usage is the same as before.

blue 
this is after power on mini2440 without running qt-gui

Mem: 23748K used, 37924K free, 0K shrd, 0K buff, 3648K cached
CPU:  0.0% usr  0.3% sys  0.0% nic 99.6% idle  0.0% io  0.0% irq  0.0% sirq
Load average: 0.04 0.01 0.00 1/29 428
  PID  PPID USER     STAT   VSZ %MEM CPU %CPU COMMAND
  428   425 root     R     3392  5.4   0  0.4 top 
  425   424 root     S     3392  5.4   0  0.0 -sh 
  402     1 root     S     3388  5.4   0  0.0 /usr/sbin/inetd 
  424   402 root     S     3076  4.9   0  0.0 /usr/sbin/telnetd -i 
    1     0 root     S     3068  4.9   0  0.0 init     
  399     1 root     S     3068  4.9   0  0.0 syslogd 
  413     1 root     S     3068  4.9   0  0.0 init     
  414     1 root     S     3068  4.9   0  0.0 init     
  415     1 root     S     3068  4.9   0  0.0 init     
  420     1 root     S     3068  4.9   0  0.0 init     
    5     2 root     SW       0  0.0   0  0.0 [khelper]
    2     0 root     SW       0  0.0   0  0.0 [kthreadd]
    3     2 root     SW       0  0.0   0  0.0 [ksoftirqd/0]
    4     2 root     SW       0  0.0   0  0.0 [events/0]
   11     2 root     SW       0  0.0   0  0.0 [async/mgr]
  115     2 root     SW       0  0.0   0  0.0 [sync_supers]
  117     2 root     SW       0  0.0   0  0.0 [bdi-default]
  119     2 root     SW       0  0.0   0  0.0 [kblockd/0]
  123     2 root     SW       0  0.0   0  0.0 [kseriod]
  129     2 root     SW       0  0.0   0  0.0 [kmmcd]

davef 
I realised you were using the TOP command.  During the period I was trying
to get Arora running on it I was told to use the free command. My debugging
skills are at a very low level.

So, if the top command shows all the resources that are being used and it
looks like you have plenty of room left then I haven't clue why you are
having a problem.

When you find the answer let us know.

blue 
the result of free comand is the same as top command.

As you see on top of the thread, some one notised me about "Out of RAM
memory?"
If you have another cooment or suggestion about rebooting problem, I will
be appreciated about it.

davef 
I was going to suggest that an older version of Qt might result in a
smaller application, but you might have integration problems.  For example,
I found that my demo/browser app got significantly bigger with 4.7.3

Another thing is to check which libraries you REALLY need for your
application and if you have unwanted libs get rid of them.

blue 
As I said before:

There is no difference in RAM usage when I compile it with qt4.6.3 or
qt4.8.0

Both qt versions have configured and cross compiled (static) with only
necessary modules (I can not disable QNetwork module)

blue 
Dear Eleandro

Did you have find any solution?

best regards

BorgesE 
Dear Blue,

Did you find solution for this rebooting problem?
I have the same problem, sometimes kernel reboots in loop for many times.
The solution is plug off power and plug again... for prototypes it's works,
but for product it's not a solution.

When it reboots the message below appears:

s3c2410-wdt s3c2410-wdt: Unexpected close, not stopping watchdog


Best Regards,