https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225584
--- Comment #57 from Konstantin Belousov <k...@freebsd.org> ---
(In reply to mike from comment #56)
Yes, that was already handled. And, the hang there is the whole system hang.
Please apply this debugging patch and try reproduce the issue one more time.
diff --git a/lib/libc/stdio/_flock_stub.c b/lib/libc/stdio/_flock_stub.c
index 069ed64c4e9..99e1af6fbfb 100644
--- a/lib/libc/stdio/_flock_stub.c
+++ b/lib/libc/stdio/_flock_stub.c
@@ -45,6 +45,8 @@ __FBSDID("$FreeBSD$");
#include <string.h>
#include <pthread.h>
#include "un-namespace.h"
+#include <signal.h>
+#include <unistd.h>
#include "local.h"
@@ -116,6 +118,8 @@ _funlockfile(FILE *fp)
/*
* Check if this file is owned by the current thread:
*/
+ while (*(volatile struct thread * volatile *)&fp->_fl_owner == NULL)
+ ;
if (fp->_fl_owner == curthread) {
/*
* Check if this thread has locked the FILE
@@ -138,4 +142,11 @@ _funlockfile(FILE *fp)
_pthread_mutex_unlock(&fp->_fl_mutex);
}
}
+ else {
+ char x[120];
+ snprintf(x, sizeof(x), "funlockfile %p %p %p\n", fp,
+ curthread, fp->_fl_owner);
+ write(2, x, strlen(x));
+ raise(SIGBUS);
+ }
}
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