Re: threads and fork on machine with VIPT-WB cache

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On 05/10/2010 09:20 PM, Helge Deller wrote:
> On 05/10/2010 04:56 PM, John David Anglin wrote:
>> Yes, just after sending, I noticed gcc testsuite and minifail were
>> broken on gsyprf11.  [...]
>>
>> The attached works better on gsyprf11.  I haven't tested it on anything
>> else.

Hi Dave,

I still can see segfaults of the minifail_dave.cpp program.

In addition I see some memory corruptions.
Those corruptions are not new due to your patch, I could see them with
other patches (and maybe even plain 2.6.32.3 kernel) as well...

pagealloc: memory corruption

6e8291c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................

6e8291d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................

6e8291e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................

6e8291f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................

Backtrace:

 [<1011ebc4>] show_stack+0x18/0x28

 [<10117b90>] dump_stack+0x1c/0x2c

 [<101c7020>] kernel_map_pages+0x2a0/0x2b8

 [<1019ebc8>] get_page_from_freelist+0x3d4/0x630

 [<1019ef58>] __alloc_pages_nodemask+0x134/0x610

 [<101b23d8>] do_wp_page+0x2c0/0xb50

 [<101b4290>] handle_mm_fault+0x514/0x844

 [<1011d870>] do_page_fault+0x1f8/0x2fc

 [<1011f400>] handle_interruption+0xec/0x730

 [<10103078>] intr_check_sig+0x0/0x40


Helge
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