Re: 2.6.12-mm1: BUG() in fd_install, RCU related?

[Dipankar Sarma <dipankar@in.ibm.com>]

On Tue, Jun 21, 2005 at 10:34:24AM +0200, Pavel Machek wrote:
> Hi!
> 
> I got 
> 
> Jun 21 10:30:20 amd kernel: ------------[ cut here ]------------
> Jun 21 10:30:20 amd kernel: kernel BUG at fs/open.c:935!
> Jun 21 10:30:20 amd kernel: invalid operand: 0000 [#1]
> Jun 21 10:30:20 amd kernel: Modules linked in: ipw2100
> Jun 21 10:30:20 amd kernel: CPU:    0
> Jun 21 10:30:20 amd kernel: EIP:    0060:[page_referenced+39/160]    Not tainted VLI
> Jun 21 10:30:20 amd kernel: EFLAGS: 00010286   (2.6.12-mm1)
> Jun 21 10:30:20 amd kernel: EIP is at fd_install+0x27/0x40
> Jun 21 10:30:20 amd kernel: eax: f7268e00   ebx: 00000080   ecx: f61a9800   edx: f6106400

This has been reported by several other people.
I am looking at it except that I can't reproduce it with the config
files in one of those bug reports. Probably whatever userland triggers
this bug isn't in my lab machine. Besides I am running really old
userland anyway. I am going to find a box with  newer userland
and try.

Some things are common - always with fcntl() or fcntl64() and with
a daemon. Does your box come up at all ? If so, can you get me an
strace on the process that triggers this ? If I can narrow it
down to a small testcase, it would be a lot easier. Also, does
switching off CONFIG_PREEMPT fix this problem ?

Thanks
Dipankar
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