Re: [discuss] mmap, mbind and write to mmap'ed memory crashes 2.6.16-rc1[2] on 2 node X86_64

[Andi Kleen <ak@suse.de>]

On Sunday 05 February 2006 17:36, Bharata B Rao wrote:
> Hi,
> 
> I am seeing a kernel crash with 2.6.16-rc1 and rc2 but not on any
> 2.6.15 kernels (rc and 2.6.15.2). Arch is x86_64.
> 
> The kernel crashes when I run an application which does:
> 	- mmap (0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS)
> 	- mbind the memory to the 1st node with policy MPOL_BIND
> 	- write to that memory
> 
> The crash time log on 2.6.16-rc2 looks like this:
> 
> Unable to handle kernel NULL pointer dereference at 0000000000000008 RIP:
> <ffffffff801614df>{__rmqueue+63}

There's another report of it. The boot logs seem ok, so I guess
mbind broke somehow. I suppose it's related to the mempolicy changes
that went into 2.6.16-rc1. I'll try to take a look tomorrow if
Christoph doesn't beat it.

OOM with mbind seems to have broken also - it oopses too.

-Andi