bk commit into 5.0 tree (kaa:1.2494) BUG#24611

[Alexey Kopytov]

Below is the list of changes that have just been committed into a local
5.0 repository of kaa. When kaa does a push these changes will
be propagated to the main repository and, within 24 hours after the
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see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html

ChangeSet@stripped, 2007-05-25 20:52:01+04:00, kaa@stripped +1 -0
  Fix for bug #24611 "mysqld crashes when connecting from remote host, and compiled from
source".
  
  On some Linux distributions with both LinuxThreads and NPTL glibc versions available,
statically built binaries can crash, because linker defaults to LinuxThreads when linking
statically, but calls to external libraries (like libnss) are resolved to NPTL versions.
  
  Since there is nothing we can do in the code to work that around, just give user an
advice on how to fix that, if a crash happened on such a binary/OS combination.

  sql/mysqld.cc@stripped, 2007-05-25 20:51:57+04:00, kaa@stripped +10 -0
    Advise a user on possible solutions in case of a crash in a statically built binary on
a system with both LinuxThreads and NPTL available.

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	kaa
# Host:	polly.local
# Root:	/mnt/ubuntu/src/bug24611/my50-bug24611

--- 1.609/sql/mysqld.cc	2007-05-02 16:25:09 +04:00
+++ 1.610/sql/mysqld.cc	2007-05-25 20:51:57 +04:00
@@ -2148,6 +2148,16 @@ later when used with nscd), disable LDAP
 mysqld that is not statically linked.\n");
 #endif
 
+#ifdef HAVE_NPTL
+  if (thd_lib_detected == THD_LIB_LT && !getenv("LD_ASSUME_KERNEL"))
+    fprintf(stderr,"\n\
+You are running a statically-linked LinuxThreads binary on an NPTL system.\n\
+This can result in crashes on some distributions due to LT/NPTL conflicts.\n\
+You should either build a dynamically-linked binary, or force LinuxThreads\n\
+to be used with the LD_ASSUME_KERNEL environment variable. Please consult\n\
+the documentation for your distribution on how to do that.\n");
+#endif
+  
   if (locked_in_memory)
   {
     fprintf(stderr, "\n\