[OpenAFS] Fwd: CRITICAL: RHEL7/CentOS7/SL7 client systems - AuriStorFS
v2021.05-10 released > OpenAFS versions?
Thu, 11 Nov 2021 13:12:42 +0100
Are all OpenAFS versions 1.6.x and 1.8.x affected by the bug described
in the enclosed mail?
-------- Forwarded Message --------
Subject: CRITICAL: RHEL7/CentOS7/SL7 client systems - AuriStorFS
Date: Wed, 10 Nov 2021 12:14:22 -0500
From: Jeffrey E Altman <email@example.com>
Organization: AuriStor, Inc.
To: Giovanni Bracco <firstname.lastname@example.org>
This morning AuriStorFS v2010.05-10 was published to workaround a
CRITICAL kernel bug present in all RHEL7/CentOS7/SL7 releases beginning
with RHEL 7.5. All kernels from 3.10.0_861.el7 through
3.10.0_1160.42.2.el7 are impacted.
The bug was introduced into upstream Linux kernels from 3.2 through 3.15
by automated patch back-porting tools. The broken back-port was then
cherry-picked from the torvalds/linux repository into the rhel7 repository.
RHEL7 is the only Linux distribution for which AuriStor builds kernel
modules that is impacted by the bug. AuriStor has submitted to Red Hat
and Red Hat has accepted a patch which is expected to be included in a
soon to be released RHEL 7.9 kernel update.
The bug is triggered when the afs disk cache is being read and the
process that issued the syscall has a pending fatal signal. In this
case, an EINTR error state results in a file system read failure but the
file system read returns success. This bug has minimal impact on a
userspace process directly issuing a file read because the process will
be terminated as soon as the syscall completes. However, the bug can
corrupt the state of the AuriStorFS cache or the Linux page cache which
might negatively impact subsequent attempts to perform directory lookups
or file access.
When this bug is triggered messages similar to those that follow might
be written to the system message log:
* yfs: Disk cache read error in CacheItems slot 59151 off
5205308/19148204 code 0/88
* yfs: Unexpected directory iteration error (2.822.23.8382
[your-cell-name.com] @ffffad57888e2424, pos 0, error 22)
Not all code paths impacted by the bug will generate an error. In
particular, corrupted page cache contents will not log an error.
AuriStor recommends that end users update any RHEL7/CentOS7/SL7 systems
running AuriStorFS or OpenAFS clients to AuriStorFS v2021.05-10 as soon
as possible. AuriStorFS v2021.05-10 contains a workaround for the
Please submit any support questions to
on behalf of the AuriStor team
phone +39 351 8804788