Date: Wed, 1 Dec 2021 11:15:14 -0700 From: Alan Somers <asomers@freebsd.org> To: FreeBSD <freebsd-stable@freebsd.org> Subject: ZFS deadlocks triggered by HDD timeouts Message-ID: <CAOtMX2hMu7qXqHt5rhi9CBNDRERpWshcF%2BR9N_VQOrYvYFERQg@mail.gmail.com>
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On a stable/13 build from 16-Sep-2021 I see frequent ZFS deadlocks triggered by HDD timeouts. The timeouts are probably caused by genuine hardware faults, but they didn't lead to deadlocks in 12.2-RELEASE or 13.0-RELEASE. Unfortunately I don't have much additional information. ZFS's stack traces aren't very informative, and dmesg doesn't show anything besides the usual information about the disk timeout. I don't see anything obviously related in the commit history for that time range, either. Has anybody else observed this phenomenon? Or does anybody have a good way to deliberately inject timeouts? CAM makes it easy enough to inject an error, but not a timeout. If it did, then I could bisect the problem. As it is I can only reproduce it on production servers. -Alan
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