Author: davidxu
Date: Tue Jul 10 05:45:13 2012
New Revision: 238336
URL: http://svn.freebsd.org/changeset/base/238336
Log:
Always clear p_xthread if current thread no longer needs it, in theory, if
debugger exited without calling ptrace(PT_DETACH), there is a time window
that the p_xthread may be pointing to non-existing thread, in practical,
this is not a problem because child process soon will be killed by parent
process.
Modified:
head/sys/kern/kern_sig.c
Modified: head/sys/kern/kern_sig.c
==============================================================================
--- head/sys/kern/kern_sig.c Tue Jul 10 05:39:06 2012 (r238335)
+++ head/sys/kern/kern_sig.c Tue Jul 10 05:45:13 2012 (r238336)
@@ -2436,9 +2436,10 @@ ptracestop(struct thread *td, int sig)
}
stopme:
thread_suspend_switch(td);
- if (!(p->p_flag & P_TRACED)) {
+ if (p->p_xthread == td)
+ p->p_xthread = NULL;
+ if (!(p->p_flag & P_TRACED))
break;
- }
if (td->td_dbgflags & TDB_SUSPEND) {
if (p->p_flag & P_SINGLE_EXIT)
break;
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