linux-kernel - possible regression of ptrace on 2.6.26-rc1

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Date:	Wed, 07 May 2008 17:20:12 +0800
From:	wenji huang <wenji.huang@...cle.com>
To:	linux-kernel@...r.kernel.org
Subject: possible regression of ptrace on 2.6.26-rc1

Hi,

When I tried the test case (ptrace-syscall-ret) on 2.6.26-rc1 kernel, 
found it always fails, but could pass on previous ones.

Here is the result (both in x86 and x86_64 box):

[wjhuang@...182-121-27 single-test]$ ./ptrace-syscall-ret
./ptrace-syscall-ret: PTRACE_CONT, pid 17315, retvalue -1: No such process

In the case, a child is created and kept in syscall loop. The parent 
will trace the syscall and kill the child at last. It seems the child
is early exited, but should stay in infinite loop. Is this my 
misunderstanding or actual regression of kernel?

The test case is attached to the mail.

Thanks,
Wenji

View attachment "ptrace-syscall-ret.c" of type "text/x-csrc" (2015 bytes)