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Re: gai_cancel()

From: Phil Blundell <pb at pbcl dot net>
To: Florian Weimer <fweimer at redhat dot com>, libc-alpha at sourceware dot org
Date: Mon, 19 Jun 2017 12:04:41 +0100
Subject: Re: gai_cancel()
Authentication-results: sourceware.org; auth=none
References: <1497627984.6717.32.camel@pbcl.net> <f23933e1-28fc-f100-5086-8e7de984fb35@redhat.com>

On Fri, 2017-06-16 at 17:52 +0200, Florian Weimer wrote:
> On 06/16/2017 05:46 PM, Phil Blundell wrote:
> > Opinions?
> 
> Is this related to bug 20874?
> 
>   https://sourceware.org/bugzilla/show_bug.cgi?id=20874
> 

No, I don't think it's related.  I poked at that bug a bit and I am
fairly sure that the problem there is specifically in gai_suspend(). 
Under conditions that I don't entirely understand yet, we seem to be
somehow returning from gai_suspend while its waitlist[] entry is still
linked into requestlist->waiting.  Since gai_suspend() allocated its
waitlist[] on the stack, this leads rapidly to disaster when gai_notify
subsequently tries to traverse the linked list.

p.

Follow-Ups:
- Re: gai_cancel()
  - From: Florian Weimer
- Re: gai_cancel()
  - From: Phil Blundell

References:
- gai_cancel()
  - From: Phil Blundell
- Re: gai_cancel()
  - From: Florian Weimer

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