[uml-devel] Compiling UML 2.6.8.1 with Static Linking results in segfault

[uml-devel] Compiling UML 2.6.8.1 with Static Linking results in segfault

[Michael Ralston]

I've just tried to compile UML with TT disabled, SKAS enabled and static
linking enabled. When I run the linux binary is immediately segfaults.

I'm using GCC 3.3.4 and Libc6 2.3.2 ...

Can I provide any further info or is this a known problem?

Michael Ralston
Stral.net



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RE: [uml-devel] Compiling UML 2.6.8.1 with Static Linking results in segfault

[Michael Ralston]

The core is 483k, want me to email that just to you (not the list), or is
the gdb output below pretty conclusive?

I'm running this on a 2.6.8.1 host with SKAS3-2.6.7-v1 patch, and as I said
libc6-2.3.2, so it's prolly another one of those lovely NPTL/TLS issues.

The Config options which are set:
# CONFIG_MODE_TT is not set
CONFIG_STATIC_LINK=y
CONFIG_MODE_SKAS=y 

If I disable STATIC_LINK then it runs fine...


(gdb) run
Starting program: /uml/linux

Program received signal SIGSEGV, Segmentation fault.
0x08191800 in __libc_setup_tls () at swab.h:134
134     swab.h: No such file or directory.
        in swab.h



> -----Original Message-----
> From: Jeff Dike [mailto:jdike@addtoit.com] 
> Sent: Wednesday, 8 September 2004 10:18 AM
> To: ralston@stral.net
> Cc: user-mode-linux-devel@lists.sourceforge.net
> Subject: Re: [uml-devel] Compiling UML 2.6.8.1 with Static 
> Linking results in segfault 
> 
> ralston@stral.net said:
> > Can I provide any further info or is this a known problem? 
> 
> Get a core, and get a stack trace from it?
> 
> 				Jeff
> 
> 



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RE: [uml-devel] Compiling UML 2.6.8.1 with Static Linking results in segfault

[Michael Ralston]

[-- Attachment #1: Type: text/plain, Size: 1660 bytes --]

Hey, the core is 20k gzipped :)

Michael 

> -----Original Message-----
> From: Michael Ralston [mailto:ralston@stral.net] 
> Sent: Wednesday, 8 September 2004 9:58 AM
> To: 'user-mode-linux-devel@lists.sourceforge.net'
> Cc: 'Jeff Dike'
> Subject: RE: [uml-devel] Compiling UML 2.6.8.1 with Static 
> Linking results in segfault 
> 
> The core is 483k, want me to email that just to you (not the 
> list), or is the gdb output below pretty conclusive?
> 
> I'm running this on a 2.6.8.1 host with SKAS3-2.6.7-v1 patch, 
> and as I said libc6-2.3.2, so it's prolly another one of 
> those lovely NPTL/TLS issues.
> 
> The Config options which are set:
> # CONFIG_MODE_TT is not set
> CONFIG_STATIC_LINK=y
> CONFIG_MODE_SKAS=y 
> 
> If I disable STATIC_LINK then it runs fine...
> 
> 
> (gdb) run
> Starting program: /uml/linux
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x08191800 in __libc_setup_tls () at swab.h:134
> 134     swab.h: No such file or directory.
>         in swab.h
> 
> 
> 
> > -----Original Message-----
> > From: Jeff Dike [mailto:jdike@addtoit.com]
> > Sent: Wednesday, 8 September 2004 10:18 AM
> > To: ralston@stral.net
> > Cc: user-mode-linux-devel@lists.sourceforge.net
> > Subject: Re: [uml-devel] Compiling UML 2.6.8.1 with Static Linking 
> > results in segfault
> > 
> > ralston@stral.net said:
> > > Can I provide any further info or is this a known problem? 
> > 
> > Get a core, and get a stack trace from it?
> > 
> > 				Jeff
> > 
> > 

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.752 / Virus Database: 503 - Release Date: 3/09/2004
 
  

[-- Attachment #2: core.gz --]
[-- Type: application/octet-stream, Size: 20991 bytes --]

Re: [uml-devel] Compiling UML 2.6.8.1 with Static Linking results in segfault

[Jeff Dike]

ralston@stral.net said:
> Can I provide any further info or is this a known problem? 

Get a core, and get a stack trace from it?

				Jeff



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Re: [uml-devel] Compiling UML 2.6.8.1 with Static Linking results in segfault

[Jeff Dike]

ralston@stral.net said:
> The core is 483k, want me to email that just to you (not the list), or
> is the gdb output below pretty conclusive? 

No it's not.  Getting a backtrace at that point would have been nice.

				Jeff



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Re: [uml-devel] Compiling UML 2.6.8.1 with Static Linking results in segfault

[Jeff Dike]

ralston@stral.net said:
> Hey, the core is 20k gzipped :) 

And the core is useless without the binary that produced it.  In any case,
it's probably a lot easier for you to type 'bt' at gdb and send that rather
than compressing a core file and binary and sending them.

				Jeff



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RE: [uml-devel] Compiling UML 2.6.8.1 with Static Linking results in segfault

[Michael Ralston]

(gdb) run
Starting program: /uml/linux-2.4.26-static

Program received signal SIGSEGV, Segmentation fault.
0x0815c520 in __libc_setup_tls ()
(gdb) bt
#0  0x0815c520 in __libc_setup_tls ()
#1  0x0815c82b in __pthread_initialize_minimal ()
#2  0x00000004 in ?? ()
#3  0xbffffd88 in ?? ()
#4  0x0815c2e8 in __libc_start_main ()
Previous frame inner to this frame (corrupt stack?)
(gdb)


I compiled the uml binary with debugging symbols enabled... Let me know if
there is anything else I can do... Would my complete .config be useful?

Michael 

> -----Original Message-----
> From: Jeff Dike [mailto:jdike@addtoit.com] 
> Sent: Thursday, 9 September 2004 10:44 AM
> To: ralston@stral.net
> Cc: user-mode-linux-devel@lists.sourceforge.net
> Subject: Re: [uml-devel] Compiling UML 2.6.8.1 with Static 
> Linking results in segfault 
> 
> ralston@stral.net said:
> > Hey, the core is 20k gzipped :)
> 
> And the core is useless without the binary that produced it.  
> In any case, it's probably a lot easier for you to type 'bt' 
> at gdb and send that rather than compressing a core file and 
> binary and sending them.
> 
> 				Jeff
> 
> 



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Re: [uml-devel] Compiling UML 2.6.8.1 with Static Linking results in segfault

[BlaisorBlade]

On Thursday 09 September 2004 06:51, Michael Ralston wrote:
> (gdb) run
> Starting program: /uml/linux-2.4.26-static
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x0815c520 in __libc_setup_tls ()
> (gdb) bt
> #0  0x0815c520 in __libc_setup_tls ()
> #1  0x0815c82b in __pthread_initialize_minimal ()
> #2  0x00000004 in ?? ()
> #3  0xbffffd88 in ?? ()
> #4  0x0815c2e8 in __libc_start_main ()
> Previous frame inner to this frame (corrupt stack?)
> (gdb)
>
>
> I compiled the uml binary with debugging symbols enabled... Let me know if
> there is anything else I can do... Would my complete .config be useful?
Please, try using the 2.6.7-1 patch. There are some changes which could be at 
fault. I'm referring to "load-low" and "link" from 
http://user-mode-linux.sourceforge.net/changelog-uml-patch-2.6.7-2.bz2.html.

At least, just for the reason they touch the linking script (after all, who 
says that the used start address should be the one we use, with TLS)?

Also, please run:
strings /usr/bin/ld | bzip2 >linkScript.bz2

and mail the obtained file (which contains the default linker scripts). I 
think I can build the patch for you easily, with that file; making it work on 
everyone's glibc could be harder.

Bye
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729


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