[Bug libc/10652] getaddrinfo causes segfault if multithreaded and linked statically

["heuler at infosim dot net" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From heuler at infosim dot net  2009-09-17 12:31 -------
The segmentation fault happens on different addresses below the
_nss_files_gethostbyname4_r. This function shows a call to __libc_lock_lock in
the source, but this probably does not work!?

The assembler code shows calls to the phread_lock() function:

Dump of assembler code for function _nss_files_gethostbyname4_r:
0x00007ffff55d8d70 <_nss_files_gethostbyname4_r+0>:     push   %r15
0x00007ffff55d8d72 <_nss_files_gethostbyname4_r+2>:     push   %r14
0x00007ffff55d8d74 <_nss_files_gethostbyname4_r+4>:     push   %r13
0x00007ffff55d8d76 <_nss_files_gethostbyname4_r+6>:     mov    %rsi,%r13
0x00007ffff55d8d79 <_nss_files_gethostbyname4_r+9>:     push   %r12
0x00007ffff55d8d7b <_nss_files_gethostbyname4_r+11>:    mov    %rdi,%r12
0x00007ffff55d8d7e <_nss_files_gethostbyname4_r+14>:    push   %rbp
0x00007ffff55d8d7f <_nss_files_gethostbyname4_r+15>:    mov    %rdx,%rbp
0x00007ffff55d8d82 <_nss_files_gethostbyname4_r+18>:    push   %rbx
0x00007ffff55d8d83 <_nss_files_gethostbyname4_r+19>:    mov    %rcx,%rbx
0x00007ffff55d8d86 <_nss_files_gethostbyname4_r+22>:    sub    $0x88,%rsp
0x00007ffff55d8d8d <_nss_files_gethostbyname4_r+29>:    cmpq  
$0x0,0x20823b(%rip)        # 0x7ffff57e0fd0 <fgetpos+2137728>
0x00007ffff55d8d95 <_nss_files_gethostbyname4_r+37>:    mov    %r8,0x30(%rsp)
0x00007ffff55d8d9a <_nss_files_gethostbyname4_r+42>:    mov    %r9,0x38(%rsp)
0x00007ffff55d8d9f <_nss_files_gethostbyname4_r+47>:    je     0x7ffff55d8dad
<_nss_files_gethostbyname4_r+61>
0x00007ffff55d8da1 <_nss_files_gethostbyname4_r+49>:    lea   
0x208498(%rip),%rdi        # 0x7ffff57e1240 <lock>
0x00007ffff55d8da8 <_nss_files_gethostbyname4_r+56>:    callq  0x7ffff55d7020
<__pthread_mutex_lock@plt>
0x00007ffff55d8dad <_nss_files_gethostbyname4_r+61>:    mov   
0x2084d1(%rip),%edi        # 0x7ffff57e1284 <keep_stream>
0x00007ffff55d8db3 <_nss_files_gethostbyname4_r+67>:    callq  0x7ffff55d8700
<internal_setent>
0x00007ffff55d8db8 <_nss_files_gethostbyname4_r+72>:    cmp    $0x1,%eax
0x00007ffff55d8dbb <_nss_files_gethostbyname4_r+75>:    mov    %eax,0x5c(%rsp)
0x00007ffff55d8dbf <_nss_files_gethostbyname4_r+79>:    je     0x7ffff55d8ded
<_nss_files_gethostbyname4_r+125>
0x00007ffff55d8dc1 <_nss_files_gethostbyname4_r+81>:    cmpq  
$0x0,0x20820f(%rip)        # 0x7ffff57e0fd8 <fgetpos+2137736>
0x00007ffff55d8dc9 <_nss_files_gethostbyname4_r+89>:    je     0x7ffff55d8dd7
<_nss_files_gethostbyname4_r+103>
0x00007ffff55d8dcb <_nss_files_gethostbyname4_r+91>:    lea   
0x20846e(%rip),%rdi        # 0x7ffff57e1240 <lock>
0x00007ffff55d8dd2 <_nss_files_gethostbyname4_r+98>:    callq  0x7ffff55d7040
<__pthread_mutex_unlock@plt>
0x00007ffff55d8dd7 <_nss_files_gethostbyname4_r+103>:   mov    0x5c(%rsp),%eax
0x00007ffff55d8ddb <_nss_files_gethostbyname4_r+107>:   add    $0x88,%rsp


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http://sourceware.org/bugzilla/show_bug.cgi?id=10652

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