Bug 244392 - strace stuck in an endless loop of restarting syscall
Summary: strace stuck in an endless loop of restarting syscall
Keywords:
Status: CLOSED RAWHIDE
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: rawhide
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Roland McGrath
QA Contact: Brian Brock
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2007-06-15 13:11 UTC by Tomas Janousek
Modified: 2007-11-30 22:12 UTC (History)
2 users (show)

Fixed In Version: 2.6.21-1.3234.fc8
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2007-06-25 09:53:19 UTC
Type: ---
Embargoed:

Attachments (Terms of Use)

Description Tomas Janousek 2007-06-15 13:11:59 UTC 
Description of problem:
Attaching strace to e.g. cat results in an endless loop of:
read(0, 0x607000, 1024)                 = ? ERESTARTSYS (To be restarted)
read(0, 0x607000, 1024)                 = ? ERESTARTSYS (To be restarted)
read(0, 0x607000, 1024)                 = ? ERESTARTSYS (To be restarted)
read(0, 0x607000, 1024)                 = ? ERESTARTSYS (To be restarted)


Version-Release number of selected component (if applicable):
kernel-2.6.21-1.3218.fc8 - bug reproducible
kernel-2.6.21-1.3221.fc8 - bug reproducible
kernel-2.6.21-1.3228.fc7 - works ok


Steps to Reproduce:
1. cat & fg
2. strace -p pid

  
Actual results:
read(0, 0x607000, 1024)                 = ? ERESTARTSYS (To be restarted)


Expected results:
read(0,
(and wait...)
Comment 1 Jan Kratochvil 2007-06-15 14:39:40 UTC 
kernel-2.6.20-1.2960.rm1.fc6.x86_64 does not reproduce this behavior.
Comment 2 Roland McGrath 2007-06-17 04:08:05 UTC 
This is a utrace interaction with 2.6.22 changes to signal magic.
I have a fix upstream.
Comment 3 Roland McGrath 2007-06-25 09:53:19 UTC 
as of 2.6.21-1.3234.fc8 this works fine
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