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Hello,

> But it has another serious problem - after some time the Xserver locks 
> up, apparently at random, but always in the same way. The process 
> doesn't die or anything like that, it just sits there and eats all 
> available CPU cycles. gdb thinks this about it:
> (gdb) bt
> #0  0x0000000040a132a4 in pthread__lock_ras_end ()
>    from /usr/lib/libpthread.so.0
Now things get weird - I got more or less the same behavior on macppc. 
After a while it locks up and gets caught in what appears to be an 
endless loop or something like that in libpthread. The only difference 
is, that macppc still reboots while sparc64 keeps hanging.
This did never happen with 4.4

have fun
Michael
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