Re: head -r356109 on 32-bit powerpc (old PowerMac): Memory modified after free during late-stage of boot, most recently used by bus-sc
Mark Millard via freebsd-ppc <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.ppc,gmane.os.freebsd.devel.hackers,gmane.os.freebsd.current |
|---|---|
| Message-ID | <[email protected]> |
On 2019-Dec-29, at 14:04, Hans Petter Selasky <hps at selasky.org> wrote:
> On 2019-12-29 22:53, Mark Millard via freebsd-hackers wrote:
>> 0xd2630510: at uma_zalloc_arg+0x1b4
>> 0xd2630540: at malloc+0xfc
>> 0xd2630580: at alloc_bounce_pages+0x7c
>> 0xd26305c0: at bus_dmamap_create+0x1e8
>
> Do you know what drivers are using bounce pages?
No clue. Looking around a bit I see that there is:
if (newtag->lowaddr < ptoa((vm_paddr_t)Maxmem) && newtag->iommu == NULL)
newtag->flags |= BUS_DMA_COULD_BOUNCE;
if (newtag->alignment > 1)
newtag->flags |= BUS_DMA_COULD_BOUNCE;
in bus_dma_tag_create (in sys/powerpc/powerpc/busdma_machdep.c ).
But that does not indicate what all specifically might have met
one of those 2 conditions for some tag creation. (The material
is not familiar.)
===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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