Date: Tue, 10 Jun 2025 19:33:59 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 287431] fusefs: deadlock during unmount if FUSE_INIT never completed Message-ID: <bug-287431-227@https.bugs.freebsd.org/bugzilla/>
index | next in thread | raw e-mail
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287431 Bug ID: 287431 Summary: fusefs: deadlock during unmount if FUSE_INIT never completed Product: Base System Version: 15.0-CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: asomers@FreeBSD.org The following sequence of events will lead to a deadlock 1) A process mounts a fuse file system but never responds to the FUSE_INIT request. 2) Some other process tries to access the mountpoint. Many different types of access might trigger this bug, but the easiest example is ls, which will trigger a FUSE_ACCESS request. That operation will block in fuse_ticket_fetch because FUSE_INIT hasn't completed yet. 3) Some process, possibly the daemon itself, tries to unmount the mount point. The unmount syscall will block in fuse_vfsop_root because the process from step 2 has the vnode lock for the fuse file system's root vnode. I have a test case for this already, but not a solution. -- You are receiving this mail because: You are the assignee for the bug.home | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-287431-227>