Date: Wed, 13 Dec 2023 01:37:32 +0000 From: bugzilla-noreply@freebsd.org To: fs@FreeBSD.org Subject: [Bug 275570] self-referential nullfs mount over tmpfs in combination with MNT_UPDATE results in a hang Message-ID: <bug-275570-3630-gCn9nmV9wC@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-275570-3630@https.bugs.freebsd.org/bugzilla/> References: <bug-275570-3630@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D275570 Kyle Evans <kevans@freebsd.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |dfr@FreeBSD.org, | |kevans@freebsd.org --- Comment #1 from Kyle Evans <kevans@freebsd.org> --- Let's start with dfr@, since the sample in question is specifically null-mounting a file over itself. With the deadlock.c attached, I hit it best with a stupid simple loop: ``` #!/bin/sh iteration=3D1 while true; do echo "Iteration $iteration" ./a.out iteration=3D$((iteration + 1)) done ``` Took me about 15 tries. When it deadlocks on my machine, it's in the nmount= (2) that would be null-mounting the file over itself rather than the follow-up MNT_UPDATE of the tmpfs mount holding it. --=20 You are receiving this mail because: You are the assignee for the bug.=
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