Bisected to Debian commit d2345d1231d8, which is a backport of the
upstream commit b88bf6c3b6ff ("PCI: Add boot interrupt quirk mechanism
for Xeon chipsets").
Reporter confirmed that reverting the Debian backport from 4.19.132
fixes the problem.
----- Forwarded message from bugzilla-daemon@xxxxxxxxxxxxxxxxxxx -----
Date: Thu, 09 Jul 2020 15:01:11 +0000
From: bugzilla-daemon@xxxxxxxxxxxxxxxxxxx
To: bjorn@xxxxxxxxxxx
Subject: [Bug 208507] New: BISECTED: i2c timeout loading module ddbridge with
commit d2345d1231d80ecbea5fb764eb43123440861462
Message-ID: <bug-208507-41252@xxxxxxxxxxxxxxxxxxxxxxxxx/>
https://bugzilla.kernel.org/show_bug.cgi?id=208507
Bug ID: 208507
Summary: BISECTED: i2c timeout loading module ddbridge with
commit d2345d1231d80ecbea5fb764eb43123440861462
Product: Drivers
Version: 2.5
Kernel Version: 4.19.132
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: PCI
Assignee: drivers_pci@xxxxxxxxxxxxxxxxxxxx
Reporter: bernhard@xxxxxxxxxx
Regression: Yes
Created attachment 290179
--> https://bugzilla.kernel.org/attachment.cgi?id=290179&action=edit
dmesg on 4.19.132
OS: Debian 10.4 Buster
CPU: Intel(R) Xeon(R) CPU D-1541 @ 2.10GHz
Hardware: Supermicro Super Server
Mainboard: Supermicro X10SDV
DVB card: Digital Devices Cine S2 V7 Advanced DVB adapter
Issue:
=====
Loading kernel module ddbridge fails with i2c timeouts, see attached dmesg. The
dvb media adapter is unusable.
This happened after Linux kernel upgrade from 4.19.98-1+deb10u1 to
4.19.118-2+deb10u1.
A git bisect based on the Debian kernel repo on branch buster identified as
first bad commit: [1fb0eb795661ab9e697c3a053b35aa4dc3b81165] Update to
4.19.116.
Another git bisect based on upstream Linux kernel repo on branch v4.19.y
identified as first bad commit: [d2345d1231d80ecbea5fb764eb43123440861462] PCI:
Add boot interrupt quirk mechanism for Xeon chipsets.
Other affected Debian kernel version: 5.6.14+2~bpo10+1
I tested this version via buster-backports, because so far I was unable to
build my own kernel from 5.6.y or even 5.7.y.
Workaround:
==========
Reverting the mentioned commit d2345d1231d80ecbea5fb764eb43123440861462 on top
of 4.19.132 is fixing the problem. Reverting the same commit on 4.19.118 or
4.19.116 is also fixing the problem.
It seems, I can only add one attachment now, so I will add more attachments
later after bug is submitted.
Thanks and Regards
Berni
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----- End forwarded message -----
