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Hi Corinna, On 3/28/19 9:30 PM, Corinna Vinschen wrote: > On Mar 28 12:48, Michael Haubenwallner wrote: >> On 3/28/19 10:58 AM, Corinna Vinschen wrote: >>> On Mar 28 10:17, Michael Haubenwallner wrote: >>>> As it is not some other dll being loaded at the colliding adress: any >>>> idea how to find out _what_ is allocated there (in the forked child), >>>> to find out whether we can reserve these areas even more early? >>> >>> I'm not sure what addresses you're talking about ATM. The addresses in >>> the 0x4:00000000 - 0x6:00000000 range? >> >> No, I'm thinking about the lower address that collides after relocation, >> if there is some cygwin allocated object we may allocate later... >> >>> These are the interesting ones. >>> The relocation to some random low address should only occur if there's >>> a collision in this range. >> >> This should be easier to find out (by inspecting the loaded dlls). > > can you please collect the base addresses of all DLLs generated during > the build, plus their size and make a sorted list? It would be > interesting to know if the hash algorithm in ld is actually as bad > as I conjecture. Please find attached the output of rebase -i for the dlls after bootstrap on Cygwin 3.0.4, each built with ld from binutils-2.31.1. > > If we can improve on the distribution within the 8 Gigs area by changing > ld's address generation(*), we may improve situations like these without > too much hassle. As always, not a foolproof way out, but heck, 8 Gigs > is a lot of space for a couple 100 DLLs. Feels like I need some Cygwin rebase step in Gentoo Prefix anyway, as there are ~250 dlls right after bootstrap - without any application yet. Thanks! /haubi/
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