Problem with 7.0-RELEASE amd64 lib32/libthr.so support of libpthread.so 32-bit binaries

[Derek Douville]

Life is funny in that when you finally decide to ask the last-line of 
defense for help, you come across the solution.

I discovered I needed to map libpthread.so.2 to libthr.so.2 (it was 
linked to version 3, which is what caused the backtrace below).

I hope this helps someone else in the future.

Thanks!


-Derek



Derek Douville wrote:
> Hi everyone,
>
> I need some help with threading lib32 compat programs under 7.0, which 
> is supposed to fix a lot of broken areas of 6.x.  We ran into 
> 32bit-compat threading issues under 6.2 amd64 and started testing 
> 7.0-RELEASE today to see if we can get a 32-bit program that was 
> compiled with -pthread to execute successfully.  So far, this is my 
> environment:
>
> (a)  FreeBSD 7.0-RELEASE amd64 installed with lib32 compatibility
> (b)  /usr/ports/compat6x installed
> (c)  /etc/libmap32.conf is empty
>
> The test code that revealed the threading issues under 6.x is this:
>
> ghost# cat pthread-crash.c
> #include <stdio.h>
> #include <pthread.h>
>
> void *thread(void *data) {
>   puts("Thread.");
>   return NULL;
> }
>
> int main() {
>   pthread_t pth;
>   void *pv;
>   pthread_create(&pth,NULL,thread,NULL);
>   pthread_join(pth,&pv);
>   return 0;
> }
>
> ghost# file pthread-crash
> pthread-crash: ELF 32-bit LSB executable, Intel 80386, version 1 
> (FreeBSD), dynamically linked (uses shared libs), not stripped
>
> This code, when compiled natively on FreeBSD 6.2 i386 with -pthread,  
> or on an amd64 platform using -m32,  yields the following error 
> messages from my amd64-bit test system (described above):
>
> ghost# ./pthread-crash
> Fatal error 'can not create signal daemon thread!
> ' at line 236 in file /usr/src/lib/libpthread/thread/thr_sig.c (errno 
> = 22)
> Abort (core dumped)
>
> (gdb) bt
> #0  0x2809bacb in pthread_testcancel ()
>   from /usr/local/lib32/compat/libpthread.so.2
> #1  0x28089972 in sigaction () from 
> /usr/local/lib32/compat/libpthread.so.2
> #2  0x28082cb9 in pthread_kill () from 
> /usr/local/lib32/compat/libpthread.so.2
> #3  0x28082534 in raise () from /usr/local/lib32/compat/libpthread.so.2
> #4  0x2817162c in abort () from /usr/local/lib32/compat/libc.so.6
> #5  0x2809c2fd in pthread_testcancel ()
>   from /usr/local/lib32/compat/libpthread.so.2
> #6  0x28087685 in sigaction () from 
> /usr/local/lib32/compat/libpthread.so.2
> #7  0x2809232c in pthread_mutexattr_init ()
>   from /usr/local/lib32/compat/libpthread.so.2
> #8  0x2808b410 in pthread_create () from 
> /usr/local/lib32/compat/libpthread.so.2
> #9  0x0804861e in main ()
>
> Any help or feedback is greatly appreciated.
>
> -Derek
>


-- 
Derek Douville (derek at ncircle.com)
Senior Platform Engineer
nCircle Network Security
W: +1-415-625-5990 YIM: douvilld