Messages in this thread | | | Date | Tue, 20 May 2008 12:10:47 -0400 | From | Jeff Dike <> | Subject | Re: UML fails to locate address space |
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On Tue, May 20, 2008 at 02:59:14PM +0100, Tom Spink wrote: > Attached. I guess the line of interest is: > > mmap2(NULL, 4096, PROT_READ|PROT_WRITE, > MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = -1 EACCES (Permission > denied)
Yup.
Can you try three things: check the maps file for any arbitrary process (i.e. /proc/$$/maps) and see if there's anything mapped at 0 gdb UML, stop it at that mmap, check its maps file and see if there's anything mapped at 0 send me a pointer to the patches that Ubuntu has applied on top of the stock kernel - I'm suspicious that they special-cased page zero in order to ensure that NULL pointer dereferences cause faults.
You can test this last theory by initializing bottom to 4096 instead of 0.
Jeff
-- Work email - jdike at linux dot intel dot com
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