Bug 309461 - utrace: tkill(SIGCONT) is not reported by waitpid() under ptrace
utrace: tkill(SIGCONT) is not reported by waitpid() under ptrace
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel (Show other bugs)
All Linux
medium Severity medium
: beta
: ---
Assigned To: Roland McGrath
Martin Jenner
: Regression
Depends On: 248532
Blocks: 425461
  Show dependency treegraph
Reported: 2007-09-27 14:00 EDT by Jan Kratochvil
Modified: 2008-05-21 10:56 EDT (History)
1 user (show)

See Also:
Fixed In Version: RHBA-2008-0314
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2008-05-21 10:56:33 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Testcase. (5.87 KB, text/plain)
2007-09-27 14:00 EDT, Jan Kratochvil
no flags Details

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2008:0314 normal SHIPPED_LIVE Updated kernel packages for Red Hat Enterprise Linux 5.2 2008-05-20 14:43:34 EDT

  None (edit)
Description Jan Kratochvil 2007-09-27 14:00:19 EDT
+++ This bug was initially created as a clone of Bug #248532 +++

Description of problem:
Behavior change from the upstream.  It affects the method I found out as the
minimal/reliable way to attach unstopped+stopped processes on upstream kernels:
* kill(SIGSTOP) the child
* waitid() (waitpid()) on it to catch its SIGSTOP notification
* tkill(SIGCONT)
* waitpid() - should not hang

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. gcc -o attach-sigcont-wait attach-sigcont-wait.c -Wall -ggdb2
2. ./attach-sigcont-wait

Actual results:
(due to a timeout on hung waitpid())

Expected results:
Comment 1 Jan Kratochvil 2007-09-27 14:00:19 EDT
Created attachment 208791 [details]
Comment 3 Jan Kratochvil 2007-11-16 18:43:34 EST
Already fixed in the original Fedora Bug 248532.
Comment 4 Eric Bachalo 2007-12-14 15:36:47 EST
Roland is/will be working on this issue.
Comment 5 RHEL Product and Program Management 2007-12-14 15:37:23 EST
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
Comment 7 Don Zickus 2007-12-21 15:18:00 EST
in 2.6.18-62.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5
Comment 9 Mike Gahagan 2008-01-28 16:24:55 EST
Confirmed attach-sigcont-wait now passes with the -75.el5 kernel
Comment 11 errata-xmlrpc 2008-05-21 10:56:33 EDT
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.


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