Linuxulator: CRASH

[Chagin Dmitry]

On Mon, May 25, 2015 at 04:12:32PM -0500, Larry Rosenman wrote:
> On Mon, May 25, 2015 at 11:55:36PM +0300, Chagin Dmitry wrote:
> > On Mon, May 25, 2015 at 03:41:18PM -0500, Larry Rosenman wrote:
> > > I have a boinc-client installation running World Community Grid science
> > > that's been working fine for months. 
> > > 
> > > Updated to current -HEAD, and now we crash the kernel if it's running. 
> > > 
> > > The backtrace points to the linuxulator. 
> > > 
> > r283544, but this is not final fix.
> > 
> > chd
> 
> Thanks!  That fixes the crash -- I'll watch for follow-on commits.
> 
this need more testing before land:


diff --git a/sys/compat/linux/linux_emul.c b/sys/compat/linux/linux_emul.c
index a28da8d..c2bf3ae 100644
--- a/sys/compat/linux/linux_emul.c
+++ b/sys/compat/linux/linux_emul.c
@@ -219,6 +219,18 @@ void
 linux_proc_exec(void *arg __unused, struct proc *p, struct image_params *imgp)
 {
 	struct thread *td = curthread;
+	struct thread *othertd;
+
+	/*
+	 * In a case of execing from linux binary properly detach
+	 * other threads from the user space.
+	 */
+	if (__predict_false(SV_PROC_ABI(p) == SV_ABI_LINUX)) {
+		FOREACH_THREAD_IN_PROC(p, othertd) {
+			if (td != othertd)
+				(p->p_sysent->sv_thread_detach)(othertd);
+		}
+	}
 
 	/*
 	 * In a case of execing to linux binary we create linux
-- 
Have fun!
chd