[PATCH 0/2] aio-posix: fix fdmon-io_uring memory leak

From: Stefan Hajnoczi <stefanha@redhat.com>
To: qemu-devel@nongnu.org
Cc: Fam Zheng <fam@euphon.net>, Kevin Wolf <kwolf@redhat.com>,
	qemu-block@nongnu.org, Stefan Weil <sw@weilnetz.de>,
	qemu-stable@nongnu.org, Max Reitz <mreitz@redhat.com>,
	Stefan Hajnoczi <stefanha@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>
Subject: [PATCH 0/2] aio-posix: fix fdmon-io_uring memory leak
Date: Mon, 11 May 2020 19:36:28 +0100	[thread overview]
Message-ID: <20200511183630.279750-1-stefanha@redhat.com> (raw)

This bug was introduced in QEMU 5.0 and causes guests to slow down because
AioHandlers are not freed when the fdmon-io_uring file descriptor monitoring
implementation is used by the main loop thread's glib event loop. This issue
does not apply to IOThread usage of fdmon-io_uring.

In practice few distros build with io_uring support enabled at the moment, so
the number of affected users is likely to be small. The fix is still suitable
for a stable release though.

https://bugs.launchpad.net/qemu/+bug/1877716
https://bugs.launchpad.net/qemu/+bug/1873032

Stefan Hajnoczi (2):
  aio-posix: don't duplicate fd handler deletion in
    fdmon_io_uring_destroy()
  aio-posix: disable fdmon-io_uring when GSource is used

 include/block/aio.h   |  3 +++
 util/aio-posix.c      | 13 +++++++++++++
 util/aio-win32.c      |  4 ++++
 util/async.c          |  1 +
 util/fdmon-io_uring.c | 13 ++++++++++---
 5 files changed, 31 insertions(+), 3 deletions(-)

-- 
2.25.3