From: bugzilla-daemon@bugzilla.kernel.org
To: linux-usb@vger.kernel.org
Subject: [Bug 207327] New: Hang when reading encrypted DVD
Date: Fri, 17 Apr 2020 17:34:56 +0000 [thread overview]
Message-ID: <bug-207327-208809@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=207327
Bug ID: 207327
Summary: Hang when reading encrypted DVD
Product: Drivers
Version: 2.5
Kernel Version: 5.5.15-200.fc31.x86_64
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: USB
Assignee: drivers_usb@kernel-bugs.kernel.org
Reporter: horsley1953@gmail.com
Regression: No
This redhat bug has a huge collection of comments analyzing the problem.
https://bugzilla.redhat.com/show_bug.cgi?id=1822948
It comes down to two issues:
1. Reading an encrypted sector on a commercial movie DVD simply generates a
scsi error with a directly connected sata drive, but put that same drive in an
external USB enclosure and read the same sector, and the read seems to hang and
leave the drive unusable.
2. systemd-udevd apparently decides to randomly read sectors, thus causing the
drive to be useless as soon as you insert a movie DVD.
Probably udevd shouldn't be doing that, but it also seems like it should be
getting an error rather than a hung process, which seems like a kernel bug
(unless it is a fundamental flaw in usb enclosures. I tried two different ones
with the same results, though they may be using the same chipset).
Comment 99 in the redhat bug has a somewhat more detailed summary:
https://bugzilla.redhat.com/show_bug.cgi?id=1822948#c99
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