Date: Thu, 04 Jun 2020 00:28:52 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 243225] "mpr0: Out of chain frames" boot hang after clang 9.0.1 import (probably timing, not compiler related) Message-ID: <bug-243225-227-Dl0LbstXOP@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-243225-227@https.bugs.freebsd.org/bugzilla/> References: <bug-243225-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D243225 --- Comment #5 from Terry Kennedy <terry-freebsd@glaver.org> --- (In reply to Warner Losh from comment #4) I tried increasing it and it doesn't help. This happens during the initial device probe at boot time. We should only need chain frames if we're doing = I/O to a connected peripheral, and this error happens even without the tape dri= ve (or anything else) connected. Changing the slot the controller is in, enabling/disabling hyperthreading, or sometimes just sitting at the loader prompt before proceeding will make the problem disappear. My guess is that = it is a timing loop that is close to marginal, depending on the other hardware= in the system. When the problem manifests, the system goes down the rabbit hol= e of "out of chain frames", probably because the code thinks the only reason for= an error in that part of the path is running out of chain frames. This is a Dell R730 (complete description in prior reply) so I can capture = the complete boot as a video and make the video (and player app) available if anyone wants to look at it. Alternatively, I can provide remore access (console, reset, etc) via the Dell iDRAC controller. The problem has persisted from 12.0 to the latest 12-STABLE. All hardware is up-to-date, Dell has replaced the controller multiple times and the tape dr= ive and cable once. --=20 You are receiving this mail because: You are the assignee for the bug.=
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