[uml-devel] Re: Expedted SIGSTOP, got status = <blah> (UML 2.4.24-1um)

[uml-devel] Re: Expedted SIGSTOP, got status = <blah> (UML 2.4.24-1um)

[D. Bahi]

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ok - i have skas hosts - and i'm tired of this occasional hang.

BEGIN HACK ALERT -- i have 'can_do_skas()' return 1 -- END HACK ALERT

and now the kernel fails to pass control to init ? why ?
(run_init_process is called with /sbin/init - but it just hangs...)

any ideas?

D. Bahi wrote:

> seems like there is a race condition around this
> sometimes i get this printout - sometimes i don't
> and sometimes it's fine - gets worse with higher
> system load here's the console output:
> 
> Checking for the skas3 patch in the host...found
> Checking for /proc/mm...found
> CONFIG_HIGHMEM not enabled - physical memory shrunk to 499122176 bytes
> Kernel virtual memory size shrunk to 32505856 bytes
> capture_stack : Expected SIGSTOP, got status = 0x1c7f
> 
> best backtrace i could get:
> 
> #4  0xa000a2b0 in main (argc=12, argv=0xbfffdb24, envp=0xbfffdb58) at 
> arch/um/main.c:146
> #3  0xa009c2e2 in linux_main (argc=12, argv=0xbfffdb24) at um_arch.c:351
> #2  0xa0097124 in can_do_skas () at process.c:265
> #1  0xa0097028 in stop_ptraced_child (pid=32285, stack=0x40001000, 
> exitcode=1) at process.c:192
> #0  0xa000f387 in panic (fmt=0xa018db00 "check_ptrace : child exited 
> with status 0x%x") at panic.c:111
> 
> -- 
> db

-- 
There are two kinds of people in this world: Those that enter a room and 
turn the television set on, and those that enter a room and turn the 
television set off. -- Raymond Shaw, The Manchurian Candidate (1962).

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Re: [uml-devel] Re: Expedted SIGSTOP, got status = <blah> (UML 2.4.24-1um)

[Jeff Dike]

dbahi@enterasys.com said:
> ok - i have skas hosts - and i'm tired of this occasional hang. 

Have you tried the reboot-signals patch?

				Jeff



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Re: [uml-devel] Re: Expedted SIGSTOP, got status = <blah> (UML 2.4.24-1um)

[D. Bahi]

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reboot-signals is only listed in the 2.6 series patches;
i didn't think to try it.

hey, THANKS! _it applies_ and almost solves the problem completely!!!

of my 20 simultaneous UMLs only one failed to launch:

    Checking for the skas3 patch in the host...found

is all it does - and it just sits there....

also on reboot - do you expect the deactivate_all_fds to fail?

umount: /dev: device is busy
Please stand by while rebooting the system.
Restarting system.

deactivate_all_fds failed, errno = 9
Checking for the skas3 patch in the host...found
Checking for /proc/mm...found


Jeff Dike wrote:

> dbahi@enterasys.com said:
> 
>>ok - i have skas hosts - and i'm tired of this occasional hang. 
> 
> 
> Have you tried the reboot-signals patch?
> 
> 				Jeff
> 

-- 
There are two kinds of people in this world: Those that enter a room and 
turn the television set on, and those that enter a room and turn the 
television set off. -- Raymond Shaw, The Manchurian Candidate (1962).

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Re: [uml-devel] Re: Expedted SIGSTOP, got status = <blah> (UML 2.4.24-1um)

[D. Bahi]

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> It applies because you're running an old 2.4.  That patch is in the current
> 2.4 UML.
> 

right 2.4.24 - 2.4.26 um deltas. got it.

>>   Checking for the skas3 patch in the host...found
> 
> 
> This is a different UML ...
> 
> 
>>Restarting system.
>>
>>deactivate_all_fds failed, errno = 9
>>Checking for the skas3 patch in the host...found
>>Checking for /proc/mm...found
> 
> 
> from this one, right?
> 

yes. the hung one stayed hung. next time i see it i'll attach gdb.

> If so, did the second one boot OK, and the only problem was the errno=9
> thing?

yes. just so.

again, many thanks.

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Re: [uml-devel] Re: Expedted SIGSTOP, got status = <blah> (UML 2.4.24-1um)

[Jeff Dike]

On Fri, Aug 06, 2004 at 06:48:29PM -0400, D. Bahi wrote:
> reboot-signals is only listed in the 2.6 series patches;
> i didn't think to try it.
> 
> hey, THANKS! _it applies_ and almost solves the problem completely!!!

It applies because you're running an old 2.4.  That patch is in the current
2.4 UML.

> of my 20 simultaneous UMLs only one failed to launch:
> 
>    Checking for the skas3 patch in the host...found

This is a different UML ...

> Restarting system.
> 
> deactivate_all_fds failed, errno = 9
> Checking for the skas3 patch in the host...found
> Checking for /proc/mm...found

from this one, right?

If so, did the second one boot OK, and the only problem was the errno=9
thing?

Try attaching gdb to an example of the failed launch, and get a stack trace
from it.

				Jeff


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