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SubjectRe: Subtle MM bug
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> struct ucred is also needed to get LinuxThreads POSIX compliant (sharing
> credentials between threads, but still keeping system calls atomic in
> relation to credential changes)

That is extremely undesirable behaviour. setuid() changes for pthreads crud
should be done by the library emulation layer. Many people have very real
and very good reasons for running multiple parallel ids. Just try writing
a threaded ftp daemon (non anonymous) without that, or an nfs server

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