[Bug general/4217] New: utrace: PTRACE_ATTACH of SIGSTOPped process hangs

["cagney at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

Opened by Jan Kratochvil (jan.kratochvil@redhat.com)  	 on 2007-03-18 13:33
EST  	[reply]  	   Private

Description of problem:
utrace implementation of ptrace(2) is incompatible:
PTRACE_ATTACH on a process being stopped (by SIGSTOP) never returns.
On non-utrace kernels it returns, tested:
  kernel-2.6.20-1.2300.fc5.x86_64
  linux-2.6.17.7.x86_64 (from kernel.org)
  linux-2.6.16-xen.i686 (from kernel.org)

Version-Release number of selected component (if applicable):
kernel-xen-2.6.19-1.2898.2.3.fc7.i686
kernel-2.6.20-1.2925.fc6.i586

How reproducible:
Always.

Steps to Reproduce:
1. Process A should be: kill -STOP process_A_PID
2. Process B should: ptrace (PTRACE_ATTACH, process_A_PID, NULL, NULL);
3. Process B should: waitpid (process_A_PID, &status, 0);

Red Hat bug:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=232837

-- 
           Summary: utrace: PTRACE_ATTACH of SIGSTOPped process hangs
           Product: frysk
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: general
        AssignedTo: frysk-bugzilla at sourceware dot org
        ReportedBy: cagney at redhat dot com
OtherBugsDependingO 1496
             nThis:


http://sourceware.org/bugzilla/show_bug.cgi?id=4217

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