Re: [Bugme-new] [Bug 9906] New: Weird hang with NPTL and SIGPROF.
- From: Frank Mayhar <fmayhar@xxxxxxxxxx>
- Date: Fri, 07 Mar 2008 16:01:37 -0800
On Fri, 2008-03-07 at 15:26 -0800, Frank Mayhar wrote:
Based on Roland's comments and from reading the source, I have a
possible fix. I'm posting the attached patch _not_ for submission but
_only_ for comment. For one thing it's based on 2.6.18.5 and for
another it hasn't had much testing yet. I wanted to get it out here for
comment, though, in case anyone can see where I might have gone wrong.
Comments, criticism and (especially!) testing enthusiastically
requested.
The previous email was missing one small part of the patch, reproduced
below. Remain calm.
----------------------------------BEGIN------------------------------------
diff -urp /home/fmayhar/Static/linux-2.6.18.5/kernel/compat.c linux-2.6.18.5/kernel/compat.c
--- /home/fmayhar/Static/linux-2.6.18.5/kernel/compat.c 2006-12-01 16:13:05.000000000 -0800
+++ linux-2.6.18.5/kernel/compat.c 2008-03-06 17:26:21.000000000 -0800
@@ -161,18 +161,11 @@ asmlinkage long compat_sys_times(struct
if (tbuf) {
struct compat_tms tmp;
struct task_struct *tsk = current;
- struct task_struct *t;
cputime_t utime, stime, cutime, cstime;
read_lock(&tasklist_lock);
- utime = tsk->signal->utime;
- stime = tsk->signal->stime;
- t = tsk;
- do {
- utime = cputime_add(utime, t->utime);
- stime = cputime_add(stime, t->stime);
- t = next_thread(t);
- } while (t != tsk);
+ utime = tsk->signal->shared_utime;
+ stime = tsk->signal->shared_stime;
/*
* While we have tasklist_lock read-locked, no dying thread
-----------------------------------END-------------------------------------
--
Frank Mayhar <fmayhar@xxxxxxxxxx>
Google, Inc.
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- References:
- Re: [Bugme-new] [Bug 9906] New: Weird hang with NPTL and SIGPROF.
- From: Roland McGrath
- Re: [Bugme-new] [Bug 9906] New: Weird hang with NPTL and SIGPROF.
- From: Frank Mayhar
- Re: [Bugme-new] [Bug 9906] New: Weird hang with NPTL and SIGPROF.
- From: Roland McGrath
- Re: [Bugme-new] [Bug 9906] New: Weird hang with NPTL and SIGPROF.
- From: Frank Mayhar
- Re: [Bugme-new] [Bug 9906] New: Weird hang with NPTL and SIGPROF.
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