Re: [uml-devel] Thread (NPTL?) support, 2.6.20-rc5-git3, x86_64, reproducible segmentation fault and possible culprit

[Antoine Martin <antoine@nagafix.co.uk>]

>> 	Vince Berk pointed out what appears to be a thread issue with uml. 
>> The "host" command, part of the bind-utils package, uses threads and crashes 
>> when asked to do anything more complex than show its help screen:
>>
>> -bash-3.1# rpm -q bind-libs bind-utils
>> bind-libs-9.3.3-0.1.rc3.fc6
>> bind-utils-9.3.3-0.1.rc3.fc6
>> -bash-3.1# host www.google.com.
>> Segmentation fault
I believe Jeff is debugging some of these issues.
Thanks for the test case though, couldn't be more simple!


>> 	The problem is completely reproducible; the root filesystem and 
>> kernel at http://ford.stearns.org/uml/ give a crash every time you actually 
>> try to look something up with "host".
>> 	Should I be talking to the glibc folks about this?
I don't think so, it is probably just a TLS issue in UML.

>  	As a side note, if I try to bypass thread support per the 
> instructions at http://dag.wieers.com/howto/compatibility/ , I get a 
> different error (following is with stock "host"):
> 
> -bash-3.1# LD_ASSUME_KERNEL=2.4.19 host www.google.com
> host: error while loading shared libraries: libnsl.so.1: cannot open 
> shared object file: No such file or directory
> 
> -bash-3.1# export LD_ASSUME_KERNEL=2.4.19
> -bash-3.1# strace -f host www.google.com.
> strace: error while loading shared libraries: libc.so.6: cannot open 
> shared object file: No such file or directory
I think that's because glibc 2.5 does not support kernel 2.4, it only 
supports nptl (unfortunately).

Antoine

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