linux-kernel - Re: mmotm 2009-08-24-16-24 uploaded

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Date:	Thu, 27 Aug 2009 16:05:32 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	oleg@...hat.com
Subject: Re: mmotm 2009-08-24-16-24 uploaded

On Thu, 27 Aug 2009 14:44:53 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> 
> In the newest mmotom, my S14nfslock hangs up. (x86-64/Fedora10)
> 
> On Mon, 24 Aug 2009 16:28:30 -0700
> akpm@...ux-foundation.org wrote:
> 
> > ptrace-__ptrace_detach-do-__wake_up_parent-if-we-reap-the-tracee.patch
> > do_wait-wakeup-optimization-shift-security_task_wait-from-eligible_child-to-wait_consider_task.patch
> 
> bisected. following 2 patches for filtering SIGCHLD cause hang (for my environ).
> 
> > do_wait-wakeup-optimization-change-__wake_up_parent-to-use-filtered-wakeup.patch
> > do_wait-wakeup-optimization-change-__wake_up_parent-to-use-filtered-wakeup-selinux_bprm_committed_creds-use-__wake_up_parent.patch

removed S14nfslockd from rc5.d and check it by strace
==
 2712] fstat(6, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
[pid  2712] mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc6f263c000
[pid  2712] dup(6)                      = 7
[pid  2712] write(6, "2712\n"..., 5)    = 5
[pid  2712] close(6)                    = 0
[pid  2712] munmap(0x7fc6f263c000, 4096) = 0
[pid  2712] clone(Process 2713 attached
child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fc6f2625780) = 2713
[pid  2712] wait4(2713, Process 2712 suspended
 <unfinished ...>
==
When process 2713 exits, process 2712 don't wake up.

Then, I sent SIGTERM to 2712
==
Process 2713 detached

[pid  2712] <... wait4 resumed> NULL, 0, NULL) = -1 ECHILD (No child processes)
[pid  2712] --- SIGTERM (Terminated) @ 0 (0) ---
==

2713 was not caught by 2712.

Thanks,
-Kame





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