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

["D. Bahi" <dbahi@enterasys.com>]

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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

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