[Bug 1423] Crash when multiple threads call gethostbyname_r

[Wine Bugs]

http://bugs.winehq.com/show_bug.cgi?id=1423





------- Additional Comments From z_god at wanadoo.nl  2003-28-06 11:09 -------
Bug comments restored from Gmane.org: 
 
I'm having trouble with this patch and Red Hat 9:  <http://www. 
winehq.com/hypermail/wine-cvs/2003/04/0224.html>.  Multithreaded  
apps started crashing deep down in the guts of gethostbyname_r  
whenever it's called from multiple threads at once.  The crash  
typically looks like this: 
 
Program received signal SIGSEGV, Segmentation fault. 
[Switching to Thread 1118186784 (LWP 27326)] 
0x4206c909 in fgets_unlocked () from /lib/tls/libc.so.6 
(gdb) bt 
#0  0x4206c909 in fgets_unlocked () from /lib/tls/libc.so.6 
#1  0x4023e1e4 in _nss_files_gethostbyname_r () from  
/lib/libnss_files.so.2 
#2  0x420f2b3c in gethostbyname_r@@GLIBC_2.1.2 () from  
/lib/tls/libc.so.6 
#3  0x40cf77c7 in __ws_gethostbyname (name=0x402900cf "media. 
monster.com",  
    dup_flag=1) at socket.c:3044 
#4  0x40cf78f4 in WS_gethostbyname (name=0x402900cf "media. 
monster.com") 
    at socket.c:3085 
(gdb) info thr 
* 8 Thread 1118186784 (LWP 27326)  0x4206c909 in fgets_unlocked  
() 
   from /lib/tls/libc.so.6 
  7 Thread 1115761952 (LWP 27325)  0xffffe002 in ?? () 
  6 Thread 1113337120 (LWP 27324)  0xffffe002 in ?? () 
  5 Thread 1110912288 (LWP 27323)  0x004168ff in ?? () 
  2 Thread 1100885280 (LWP 27314)  0xffffe002 in ?? () 
  1 Thread 1074023232 (LWP 27305)  0xffffe002 in ?? () 
(gdb) thr 7 
[Switching to thread 7 (Thread 1115761952 (LWP 27325))]#0   
0xffffe002 in ?? () 
(gdb) bt 
#0  0xffffe002 in ?? () 
#1  0x41c5f6d4 in send_dg () from /lib/libresolv.so.2 
#2  0x41c5ecb5 in __libc_res_nsend () from /lib/libresolv.so.2 
#3  0x41c5dc07 in __libc_res_nquery () from /lib/libresolv.so.2 
#4  0x41c5e35b in __libc_res_nquerydomain () from /lib/libresolv. 
so.2 
#5  0x41c5df22 in __libc_res_nsearch () from /lib/libresolv.so.2 
#6  0x40d0805f in _nss_dns_gethostbyname2_r () from  
/lib/libnss_dns.so.2 
#7  0x40d08293 in _nss_dns_gethostbyname_r () from  
/lib/libnss_dns.so.2 
#8  0x420f2b3c in gethostbyname_r@@GLIBC_2.1.2 () from  
/lib/tls/libc.so.6 
#9  0x40cf77c7 in __ws_gethostbyname (name=0x40295b4f "media. 
monster.com",  
    dup_flag=1) at socket.c:3044 
#10 0x40cf78f4 in WS_gethostbyname (name=0x40295b4f "media. 
monster.com") 
    at socket.c:3085 
 
Reversing patch #7969 seems to fix the problem.  To reproduce the  
crash, run the local web proxy Proxomitron <http://www. 
proxomitron.org/> and try loading sites with lots of images.  I'm  
running Red Hat 9 with glibc 2.3.2-27.9 and the --with-nptl  
configure option (wine fully rebuilt after installing RH9). 
 
 
------- Additional Comments From prupe <at> myrealbox.com  2003-05-03 14:36 ------- 
After rebuilding from the latest CVS, I can't get this crash to happen any more.  
Marking as fixed. 

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