From: Andrew Morton <akpm@zip.com.au>
To: Terence Ripperda <tripperda@nvidia.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: lockup on Athlon systems, kernel race condition?
Date: Fri, 30 Aug 2002 14:15:14 -0700 [thread overview]
Message-ID: <3D6FE062.A48B6F03@zip.com.au> (raw)
In-Reply-To: 20020830204022.GC736@hygelac
Terence Ripperda wrote:
>
> ...
>
> asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
> {
> struct file * filp;
> unsigned int flag;
> int on, error = -EBADF;
>
> filp = fget(fd);
> if (!filp)
> goto out;
> error = 0;
> lock_kernel(); <====
> switch (cmd) {
This CPU is spinning, waiting for kernel_flag. It will take the IPI
and the other CPU's smp_call_function() will succeed.
Possibly the IPI has got lost - seems that this is a popular failure mode
for flakey chipsets/motherboards.
Or someone has called sys_ioctl() with interrupts disabled. That's very
doubtful.
next prev parent reply other threads:[~2002-08-30 21:13 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-30 20:40 lockup on Athlon systems, kernel race condition? Terence Ripperda
2002-08-30 21:15 ` Andrew Morton [this message]
2002-08-31 0:36 ` Alan Cox
2002-09-03 18:35 ` Terence Ripperda
2002-09-03 18:54 ` Andrew Morton
2002-09-03 20:46 ` Alan Cox
-- strict thread matches above, loose matches on Subject: below --
2002-09-03 21:46 Manfred Spraul
2002-09-03 22:04 ` Terence Ripperda
2002-09-04 15:05 ` Manfred Spraul
2002-09-04 16:17 ` Terence Ripperda
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