From: Eric Dumazet <dada1@cosmosbay.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: [RFC, PATCH] cond_resched() added to close_files()
Date: Fri, 12 May 2006 14:24:13 +0200 [thread overview]
Message-ID: <44647E6D.7080905@cosmosbay.com> (raw)
In-Reply-To: <20060512102057.GA22985@elte.hu>
Ingo Molnar a écrit :
> * Andrew Morton <akpm@osdl.org> wrote:
>
>
>> Makes my machine hang early during the startup of init.
>>
>> The last process to pass through close_file() is `hostname', presuably
>> parented by init. `hostname' exits then everything stops. init is
>> left sleeping in select().
>>
>> All very strange.
>>
>
> weird. This really shouldnt cause a hang - i think there must be a bug
> hiding elsewhere, this cond_resched() ought to be fine.
>
> Ingo
>
>
Maybe a process is now awaken because of a closed pipe, instead of a SIGCHLD
Process A, father/parent of process B. They share a pipe (A reads the
pipe, B writes to)
Before
Process B exits, "atomically close all of its files and sending a SIGCLD
to its parent"
Process A catch the SIGCLD.
After :
Process B exits "close its files (and the pipe), reschedule before final
SIGCLD"
Process A gets the POLLIN/POLLHUP indication on the pipe -> Another code
path is run and may trigger a user side bug ?
Eric
next prev parent reply other threads:[~2006-05-12 12:24 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20060419112130.GA22648@elte.hu>
2006-04-20 9:18 ` assert/crash in __rmqueue() when enabling CONFIG_NUMA Nick Piggin
2006-04-21 11:20 ` Ingo Molnar
2006-04-21 11:45 ` Ingo Molnar
2006-05-01 12:49 ` Ingo Molnar
2006-05-02 6:48 ` Andi Kleen
2006-05-02 7:06 ` Ingo Molnar
2006-05-02 7:05 ` Andi Kleen
2006-05-02 8:27 ` Ingo Molnar
2006-05-02 14:02 ` Martin J. Bligh
2006-05-02 14:25 ` Nick Piggin
2006-05-04 1:32 ` Bob Picco
2006-05-04 8:37 ` Ingo Molnar
2006-05-04 9:14 ` Ingo Molnar
2006-05-04 9:26 ` Ingo Molnar
2006-05-04 8:37 ` Andy Whitcroft
2006-05-04 15:21 ` Dave Hansen
2006-05-04 15:46 ` Bob Picco
2006-05-04 16:07 ` Dave Hansen
2006-05-04 19:25 ` Ingo Molnar
2006-05-04 19:43 ` Bob Picco
2006-05-04 21:50 ` Andy Whitcroft
2006-05-05 5:17 ` Ingo Molnar
2006-05-05 13:55 ` Bob Picco
2006-05-05 14:33 ` Dave Hansen
2006-05-05 14:50 ` Bob Picco
2006-05-05 14:57 ` Dave Hansen
2006-05-05 15:03 ` Martin J. Bligh
2006-05-05 16:22 ` Bob Picco
2006-05-05 16:18 ` Bob Picco
2006-05-06 8:32 ` Nick Piggin
2006-05-07 13:07 ` Andy Whitcroft
2006-05-07 13:18 ` Nick Piggin
2006-05-09 11:05 ` [PATCH 0/3] Zone boundry alignment fixes Andy Whitcroft
2006-05-09 11:05 ` [PATCH 1/3] zone init check and report unaligned zone boundries Andy Whitcroft
2006-05-09 11:28 ` Nick Piggin
2006-05-09 11:05 ` [PATCH 2/3] x86 align highmem zone boundries with NUMA Andy Whitcroft
2006-05-09 11:05 ` [PATCH 3/3] zone allow unaligned zone boundries Andy Whitcroft
2006-05-11 7:59 ` [PATCH 0/3] Zone boundry alignment fixes Andrew Morton
2006-05-12 14:19 ` Ingo Molnar
2006-05-13 1:39 ` Nick Piggin
2006-05-18 14:20 ` [PATCH 0/2] Zone boundary alignment fixes cleanups Andy Whitcroft
2006-05-18 14:21 ` [PATCH 1/2] zone init check and report unaligned zone boundaries fix Andy Whitcroft
2006-05-18 14:21 ` [PATCH 2/2] zone allow unaligned zone boundaries spelling fix Andy Whitcroft
2006-05-18 14:49 ` Andy Whitcroft
2006-05-18 15:54 ` [PATCH 0/2] Zone boundary alignment fixes, cleanups v2 Andy Whitcroft
2006-05-18 15:55 ` [PATCH 1/2] zone init check and report unaligned zone boundaries fix Andy Whitcroft
2006-05-18 15:55 ` [PATCH 2/2] zone allow unaligned zone boundaries spelling fix Andy Whitcroft
2006-05-02 15:03 ` assert/crash in __rmqueue() when enabling CONFIG_NUMA Andi Kleen
2006-05-02 15:17 ` Martin J. Bligh
2006-05-02 15:45 ` Andi Kleen
2006-05-02 16:02 ` Martin J. Bligh
2006-05-02 16:05 ` Andi Kleen
2006-05-02 19:47 ` Ingo Molnar
2006-05-02 19:48 ` Ingo Molnar
2006-05-02 19:44 ` Andi Kleen
2006-05-02 19:56 ` Martin Bligh
2006-05-02 20:00 ` Andi Kleen
2006-05-02 20:13 ` Ingo Molnar
2006-05-02 20:12 ` Andi Kleen
2006-05-02 15:52 ` Ingo Molnar
2006-05-02 19:55 ` [RFC, PATCH] cond_resched() added to close_files() Eric Dumazet
2006-05-03 7:01 ` Ingo Molnar
2006-05-12 9:44 ` Andrew Morton
2006-05-12 10:20 ` Ingo Molnar
2006-05-12 12:24 ` Eric Dumazet [this message]
2006-05-14 0:09 ` Lee Revell
2006-04-21 11:51 ` assert/crash in __rmqueue() when enabling CONFIG_NUMA Nick Piggin
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