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Re: kern/52147: deadlock when booting from USB disk
The following reply was made to PR kern/52147; it has been noted by GNATS.
From: christos%zoulas.com@localhost (Christos Zoulas)
To: gnats-bugs%NetBSD.org@localhost, jdolecek%NetBSD.org@localhost, gnats-admin%netbsd.org@localhost,
Subject: Re: kern/52147: deadlock when booting from USB disk
Date: Wed, 12 Apr 2017 08:25:18 -0400
On Apr 12, 5:30am, mlelstv%serpens.de@localhost (Michael van Elst) wrote:
-- Subject: Re: kern/52147: deadlock when booting from USB disk
| >Can you print the deadlock path? Or instructions how to reproduce it?
| This here happened on RPI with root on an a USB drive and filesystems
| using WAPBL. The deadlock occurs shortly after starting userland
| when a journal is played back (e.g. when root is remounted).
| This could happen on all archs with SCSI disks.
Yes, I understand.
| The journal play back triggered a SCSI error (bad MODE SENSE) which triggers
| a scsiverbose message which triggers the autoload but which cannot access
| the sd device because REQUEST SENSE processing has the periph frozen.
| Also, the message is printed synchronously in the completion thread, so
| even when you offload the module loading, no other error on the same scsi
| bus could be processed.
| A workaround was to put scsiverbose into /etc/modules.conf which is
| done while root is still read-only.
But hasn't the bad MODE SENSE been fixed now? I.e. the code was changed
back not to do MODE SENSE? Or do we need the notion of "root is currently
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