From nobody Wed Oct 06 20:29:03 2021 X-Original-To: dev-commits-src-all@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id B4FF612BC61A; Wed, 6 Oct 2021 20:29:03 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4HPmJH4mMnz4smZ; Wed, 6 Oct 2021 20:29:03 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 78BAA26829; Wed, 6 Oct 2021 20:29:03 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 196KT3p1095990; Wed, 6 Oct 2021 20:29:03 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 196KT3qj095989; Wed, 6 Oct 2021 20:29:03 GMT (envelope-from git) Date: Wed, 6 Oct 2021 20:29:03 GMT Message-Id: <202110062029.196KT3qj095989@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Alan Somers Subject: git: f44a448709d3 - main - fusefs: fix intermittency in the dev_fuse_poll test List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-all@freebsd.org X-BeenThere: dev-commits-src-all@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: asomers X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: f44a448709d3b77508fd59ee28201ae1666387c2 Auto-Submitted: auto-generated X-ThisMailContainsUnwantedMimeParts: N The branch main has been updated by asomers: URL: https://cgit.FreeBSD.org/src/commit/?id=f44a448709d3b77508fd59ee28201ae1666387c2 commit f44a448709d3b77508fd59ee28201ae1666387c2 Author: Alan Somers AuthorDate: 2021-09-25 16:16:20 +0000 Commit: Alan Somers CommitDate: 2021-10-06 20:28:48 +0000 fusefs: fix intermittency in the dev_fuse_poll test The DevFusePoll::access/select test would occasionally segfault. The cause was a file descriptor that was shared between two threads. The first thread would kill the second and close the file descriptor. But it was possible that the second would read the file descriptor before it shut down. That did not cause problems for kqueue, poll, or blocking operation, but it triggered segfaults in select's macros. MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D32142 --- tests/sys/fs/fusefs/mockfs.cc | 10 +++++++--- tests/sys/fs/fusefs/mockfs.hh | 2 +- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/tests/sys/fs/fusefs/mockfs.cc b/tests/sys/fs/fusefs/mockfs.cc index 4d0724b9c227..99f7ccc61273 100644 --- a/tests/sys/fs/fusefs/mockfs.cc +++ b/tests/sys/fs/fusefs/mockfs.cc @@ -870,6 +870,7 @@ void MockFS::read_request(mockfs_buf_in &in, ssize_t &res) { struct timeval timeout_tv; const int timeout_ms = 999; int timeout_int, nfds; + int fuse_fd; switch (m_pm) { case BLOCKING: @@ -906,19 +907,22 @@ void MockFS::read_request(mockfs_buf_in &in, ssize_t &res) { ASSERT_TRUE(fds[0].revents & POLLIN); break; case SELECT: + fuse_fd = m_fuse_fd; + if (fuse_fd < 0) + break; timeout_tv.tv_sec = 0; timeout_tv.tv_usec = timeout_ms * 1'000; - nfds = m_fuse_fd + 1; + nfds = fuse_fd + 1; while (nready == 0) { FD_ZERO(&readfds); - FD_SET(m_fuse_fd, &readfds); + FD_SET(fuse_fd, &readfds); nready = select(nfds, &readfds, NULL, NULL, &timeout_tv); if (m_quit) return; } ASSERT_LE(0, nready) << strerror(errno); - ASSERT_TRUE(FD_ISSET(m_fuse_fd, &readfds)); + ASSERT_TRUE(FD_ISSET(fuse_fd, &readfds)); break; default: FAIL() << "not yet implemented"; diff --git a/tests/sys/fs/fusefs/mockfs.hh b/tests/sys/fs/fusefs/mockfs.hh index 24ca017dcdb1..600a4b4292c0 100644 --- a/tests/sys/fs/fusefs/mockfs.hh +++ b/tests/sys/fs/fusefs/mockfs.hh @@ -284,7 +284,7 @@ class MockFS { pthread_t m_daemon_id; /* file descriptor of /dev/fuse control device */ - int m_fuse_fd; + volatile int m_fuse_fd; /* The minor version of the kernel API that this mock daemon targets */ uint32_t m_kernel_minor_version;