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

From: KAMEZAWA Hiroyuki
Date: Thu Aug 27 2009 - 03:07:41 EST


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

>
> In the newest mmotom, my S14nfslock hangs up. (x86-64/Fedora10)
>
> On Mon, 24 Aug 2009 16:28:30 -0700
> akpm@xxxxxxxxxxxxxxxxxxxx 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





--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/