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Ok, I was wrong. I actually can only reproduce this in a build that's using not 2.4.18 headers but newer headers that define __NR_set_thread_area (when running on a 2.4.18 kernel that doesn't have the system call). If that is your situation too, are you sure it worked before? If that is not your situation, then I can't reproduce your situation and you will have to find some more information for me. The crash I see is from the useldt.h macros' use of INLINE_SYSCALL resulting in it calling __errno_location, which bombs when %gs isn't set up yet. AFAICT the useldt.h macros have the very same issue with errno not being set up as the TLS macros have (errno TLS var vs __errno_location definition from libpthread, but both need %gs to be set up or they crash). So I am going to consolidate those macros and use the versions that avoid trying to set errno for both.
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