From: "D.J. Barrow" <barrow_dj@yahoo.com>
To: linuxppc-dev <linuxppc-dev@lists.linuxppc.org>
Subject: Bug in ptrace on smp systems
Date: Mon, 15 Nov 1999 06:06:45 -0800 (PST) [thread overview]
Message-ID: <19991115140645.12495.rocketmail@web207.mail.yahoo.com> (raw)
Hi,
I found a bugs which causes gdb to go to sleep
forever on smp systems occaisionally
in ptrace.c in the 2.2.10 kernel
( maybe you've this fixed maybe not )
in the sys_ptrace call you are
setting exit_code in most cases after calling
wake_up_process(child) this is incorrect as the
function sys_wait4 will get very confused on smp
systems as the process will be woken up on another
processor & deliver a new exit_code from do_signal
which this code will subsequently clear.
It also would be wise to move the clear_single_step
statement before wake_up_process in PTRACE_CONT.
For the correct treatment of exit_code look at the
intel code.
D.J.
=====
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reply other threads:[~1999-11-15 14:06 UTC|newest]
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