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Bug 1672773 - glibc: Missing robust mutex compiler barriers in pthread_mutex_trylock.c
Summary: glibc: Missing robust mutex compiler barriers in pthread_mutex_trylock.c
Alias: None
Deadline: 2019-04-24
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: glibc
Version: 8.0
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: 8.1
Assignee: Patsy Griffin
QA Contact: qe-baseos-tools-bugs
Depends On: 1672771 1682593
Blocks: 1684553 1701002
TreeView+ depends on / blocked
Reported: 2019-02-05 21:07 UTC by Carlos O'Donell
Modified: 2023-07-18 14:30 UTC (History)
8 users (show)

Fixed In Version: glibc-2.28-48.el8
Doc Type: No Doc Update
Doc Text:
Clone Of: 1672771
Last Closed: 2019-11-05 21:29:04 UTC
Type: Bug
Target Upstream Version:

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:3513 0 None None None 2019-11-05 21:29:24 UTC
Sourceware 24180 0 None None None 2019-08-29 14:02:17 UTC

Description Carlos O'Donell 2019-02-05 21:07:11 UTC
+++ This bug was initially created as a clone of Bug #1672771 +++

There are 10 missing compiler barriers in pthread_mutex_trylock.c, which can under certain circumstances, allow an optimizing compiler to reorder stores such that the kernel can observe an inconsistent state in the robust list.

Stefan Liebler's (IBM) patch:

My review:

We should backport this to rhel-7.7, since in rhel-7.6 we did a lot of work to fix other robust mutex issues for the Samba team.

Comment 2 Carlos O'Donell 2019-02-22 19:23:07 UTC
commit 823624bdc47f1f80109c9c52dee7939b9386d708
Author: Stefan Liebler <stli.com>
Date:   Thu Feb 7 15:18:36 2019 +0100

    Add compiler barriers around modifications of the robust mutex list for pthread_mutex_trylock. [BZ #24180]

Comment 7 Sergey Kolosov 2019-09-24 12:31:59 UTC
Verified with objdump based on https://bugzilla.redhat.com/show_bug.cgi?id=1672771#c7 comment, also sanity check that patch was applied.

Comment 9 errata-xmlrpc 2019-11-05 21:29:04 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.


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