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BUG#24507 (rpl_log.test crash slave):

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The problem was located to lie inside current NPTL pthread_exit() 
implementation. Race conditions in this code can lead to segmentation
fault. Hovewer, this can happen only in a race between first thread 
calling pthread_exit() and other threads. 

Workaround implemented in this patch spawns a dummy thread, which
exits immediately, during thread lib initialization. This will exclude
segment violations when further threads exit.
 


include/my_pthread.h:
  define macro NPTL_PTHREAD_EXIT_BUG which controls whether workaround
  in my_thread_global_init() is included or not.
mysys/my_thr_init.c:
  Spawn a dummy thread in my_thread_global_init() to initialize pthread 
  lib internal variables.
This commit is contained in:
unknown
2006-12-08 11:41:12 +01:00
parent 00fec63a38
commit 9f37ea459c
2 changed files with 59 additions and 0 deletions
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20
include/my_pthread.h
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@@ -31,6 +31,26 @@ extern "C" {
#define EXTERNC
#endif /* __cplusplus */
/*
BUG#24507: Race conditions inside current NPTL pthread_exit() implementation.
If macro NPTL_PTHREAD_EXIT_HACK is defined then a hack described in the bug
report will be implemented inside my_thread_global_init() in my_thr_init.c.
This amounts to spawning a dummy thread which does nothing but executes
pthread_exit(0).
This bug is fixed in version 2.5 of glibc library.
TODO: Remove this code when fixed versions of glibc6 are in common use.
*/
#if defined(TARGET_OS_LINUX) && defined(HAVE_NPTL) &&
defined(__GLIBC__) && ( __GLIBC__ < 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ < 5 )
#define NPTL_PTHREAD_EXIT_BUG 1
#endif
#if defined(__WIN__) || defined(OS2)
#ifdef OS2