arm64: userspace broken with jemalloc 4.0.0

[Andrew Turner]

On Sat, 29 Aug 2015 23:05:52 +0100
Julien Grall <julien.grall at citrix.com> wrote:

> Hi,
> 
> I've built the latest freebsd master (r287263) for arm64 today. While
> trying to use the userspace I hit some ASSERT in jemalloc:
> 
> # ls
> <jemalloc>: /usr/src/freebsd/lib/libc/../../contrib/jemalloc/include/jemalloc/internal/arena.h:571:
> Failed assertion: "pageind >= map_bias" pid 21 (ls), uid 0: exited on
> signal 6 Abort trap
> 
> It's happening every time with the command "ls".
> 
> I tried to use the previous version of jemalloc (i.e reverting
> all the patches up to "Update jemalloc to version 4.0.0" included)
> and everything is working.
> 
> Note that I'm using Freebsd as a Xen ARM guest although the only
> difference is the version of jemalloc (4.0.0 vs 3.6.0).
> 
> Does anyone using arm64 have seen a similar ASSERT?
> 
> BTW, is there any way to rebuild only the libc rather than doing
> make buildworld everytime I modified the jemalloc code?
> 
> Regards,
> 

This is a bug in the runtime linkers handling of tls. The attached
patch allows me to get to multiuser mode without anything hitting the
above assert.

Andrew

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