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From: Victor Zandy <zandy@cs.wisc.edu>
To: linux-kernel@vger.kernel.org
Subject: Re: BUG: Global FPU corruption in 2.2
Date: 24 Apr 2001 13:21:41 -0500	[thread overview]
Message-ID: <cpxitjurwei.fsf@goat.cs.wisc.edu> (raw)


Linus Torvalds writes:
> Ahh.. This actually _does_ look like a race on "current->flags": 
> PTRACE_ATTACH will do a 
> 
>         child->flags |= PF_PTRACED; 
> 
> without waiting for the child to have stopped. 

I can see how this could case PF_USEDFPU to be cleared inadvertently,
but I do not have any ideas for testing this.  Is it clear that this
is the source of the problem?

What would be involved in backporting the split ptrace flags to 2.2?
Are there other solutions?

Vic

             reply	other threads:[~2001-04-24 18:24 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-04-24 18:21 Victor Zandy [this message]
2001-04-24 18:37 ` BUG: Global FPU corruption in 2.2 Alan Cox
2001-04-24 19:17   ` Victor Zandy
2001-04-24 19:51     ` Alan Cox
  -- strict thread matches above, loose matches on Subject: below --
2001-04-24 13:05 Victor Zandy
2001-04-24 16:24 ` Linus Torvalds
2001-04-24 16:47 ` Christian Ehrhardt
2001-04-24 18:09   ` Victor Zandy
2001-04-24  8:56 alad
2001-04-24  7:56 alad
2001-04-24  5:33 alad
2001-04-19 16:05 Victor Zandy
2001-04-19 20:18 ` Michal Jaegermann
2001-04-20 18:50 ` Victor Zandy
2001-04-20 19:07   ` Richard B. Johnson
2001-04-20 19:20     ` Victor Zandy
2001-04-20 19:44       ` Richard B. Johnson
2001-04-20 19:23     ` Ulrich Drepper
2001-04-20 19:37       ` Richard B. Johnson
2001-04-20 20:20         ` Victor Zandy
2001-04-20 21:44         ` Ulrich Drepper
2001-04-22  1:46           ` Richard B. Johnson
2001-04-22  2:18             ` Alan Cox
2001-04-22  2:30               ` Richard B. Johnson
2001-04-22 18:39           ` David Konerding
2001-04-22 18:59             ` Alan Cox
2001-04-22 20:59 ` kees
2001-04-23 16:11 ` Christian Ehrhardt
2001-04-24 16:10   ` Linus Torvalds
2001-04-24 16:25     ` Alan Cox
2001-04-24 16:56     ` Christian Ehrhardt
2001-04-24 20:15       ` Michal Jaegermann
2001-04-23 18:44 ` Erik Paulson

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