Date: Thu, 18 Jul 2019 02:35:41 +0000 From: bugzilla-noreply@freebsd.org To: fs@FreeBSD.org Subject: [Bug 237517] ZFS parallel mounting sometimes misses mounting intermediate filesystems Message-ID: <bug-237517-3630-ZNE5pA6cFD@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-237517-3630@https.bugs.freebsd.org/bugzilla/> References: <bug-237517-3630@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237517 --- Comment #14 from fullermd@over-yonder.net --- Well, I spent some time looking at it. The source of the issue winds up being how the FS's are sorted and fed into the parallel mounting. Because the list winds up being "/x/y/z /x/y/z /x/y/z/a [...]", the first /x finds out that the second is not one of its descendents, so assumes it has nothing else to do in that branch. Meanwhile, the higher level also skips it in weird ways. I'm a little unsure why it's not deterministic, but... Anyway, I worked up a patch that seems like it should fix it, and in testing I'm no longer able to reproduce it. Then I made the mistake of going over to look at ZoL, to see if they'd seen anything similar and had near-enough code for it to apply there. And it turns out they actually applied a slightly different (but I think semantically equivalent) fix, for what looks like slightly different symptoms, just last week. With their patch, I'm also unable to reproduce it. So, see https://github.com/zfsonlinux/zfs/commit/ab5036df1ccbe1b18c1ce6160b5829e8039d94ce#diff-13df3dd8690ce1edf20baa129b4e9608 -- You are receiving this mail because: You are the assignee for the bug.
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