[Bug nptl/3124] New: pthread_create in sigcancel unwind

["walter dot stocker at datacon dot at" <sourceware-bugzilla at sourceware dot org>]

A thread created during unwind caused by pthread_cancel, can't be cancelled 
(doesn't react to SIGCANCEL).

workaround: the created thread unblocks SIGCANCEL (using syscall because 
pthread_sigmask removes SIGCANCEL)

The attached testcase is a try to make a minimal example, the situation 
occurred in a large C++ project.
Within the scope of the project it makes more sense than in the testcase.


Testsystem:
Linux 2.6.15.4 #1 PREEMPT Mon Jul 10 15:39:46 CEST 2006 i686 i686 i386 GNU/Linux
gcc 3.4.4
glibc 2.3.5 (productive system) also: glibc 2.3.6 and glibc 2.4

Testcase build:
gcc -lpthread unwinder.c -o unwinder

The program blocks on pthread_join, the thread continues to run.
 starting unwinder
 unwinder running (b7e89ba0)
 cancel unwinder (b7e89ba0)
 unwinder_cleanup starting thread
 joined unwinder (b7e89ba0)
 thread running (b7678ba0)
 cancel thread (b7678ba0) -> blocks here

-- 
           Summary: pthread_create in sigcancel unwind
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
        AssignedTo: drepper at redhat dot com
        ReportedBy: walter dot stocker at datacon dot at
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=3124

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