Another fix for dynamic engines (#1956963)

0001-don-t-access-dlclose-d-dynamic-ioengine-object-after.patch

@@ -0,0 +1,42 @@
+From 79f488cbd95ca6989031a7ace5ec382313d31b3c Mon Sep 17 00:00:00 2001
+From: Eric Sandeen <esandeen@redhat.com>
+Date: Fri, 7 May 2021 16:13:05 -0500
+Subject: [PATCH] don't access dlclose'd dynamic ioengine object after close
+
+Alexey reported this bug when using dynamically loaded IO engines;
+a segfault on the line where we set the dlhandle to NULL after
+the dlclose.
+
+I think this is because ops points to the thing we obtained from dlsym:
+
+	ops = dlsym(dlhandle, engine_lib);
+
+and after the final dlclose, the object no longer exists and efforts
+to set the handle within it will fail for obvious reasons.
+I'm not sure why I hadn't seen this before.
+
+Fixes-RH-Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1956963
+Reported-by: Alexey Dobriyan <adobriyan@gmail.com>
+Fixes: f6931a1 ("fio: move dynamic library handle to io_ops structure")
+Tested-by: Alexey Dobriyan <adobriyan@gmail.com>
+Signed-off-by: Eric Sandeen <sandeen@redhat.com>
+Signed-off-by: Jens Axboe <axboe@kernel.dk>
+---
+ ioengines.c | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/ioengines.c b/ioengines.c
+index 3561bb4e..dd61af07 100644
+--- a/ioengines.c
++++ b/ioengines.c
+@@ -234,7 +234,6 @@ void free_ioengine(struct thread_data *td)
+ 	if (td->io_ops->dlhandle) {
+ 		dprint(FD_IO, "dlclose ioengine %s\n", td->io_ops->name);
+ 		dlclose(td->io_ops->dlhandle);
+-		td->io_ops->dlhandle = NULL;
+ 	}
+ 
+ 	td->io_ops = NULL;
+-- 
+2.26.2
+

fio.spec

@@ -1,11 +1,12 @@
 Name:		fio
 Version:	3.26
-Release:	1%{?dist}
+Release:	2%{?dist}
 Summary:	Multithreaded IO generation tool
 
 License:	GPLv2
 URL:		http://git.kernel.dk/?p=fio.git;a=summary
 Source:		http://brick.kernel.dk/snaps/%{name}-%{version}.tar.bz2
+Patch0:		0001-don-t-access-dlclose-d-dynamic-ioengine-object-after.patch
 
 BuildRequires:	gcc
 BuildRequires:	libaio-devel
@@ -207,6 +208,9 @@ make install prefix=%{_prefix} mandir=%{_mandir} libdir=%{_libdir}/fio DESTDIR=$
 %endif
 
 %changelog
+* Tue May 18 2021 Eric Sandeen <sandeen@redhat.com> 3.26-2
+- Another fix for dynamic engines (#1956963)
+
 * Fri Mar 12 2021 Eric Sandeen <sandeen@redhat.com> 3.26-1
 - New upstream version