[uml-devel] strace of "ls" under Fedora Core 3

[Marion Bates <mbates@whoopis.com>]

[this is Marion channeling Bill.]

	As a quick reminder, Marion and Bill are trying to get i386 fedora 
core 3 running under uml (2.6.4, with the i386 emulation code) on ford 
(x86_64).  The uml binaries don't have TLS support, so we've renamed 
all of: /lib/tls. /usr/lib/tls, and /usr/X11R6/lib/tls directories.
	Even with that done, we're getting "cannot set up LDT for thread-local 
storage" as an error message when running something as simple as 
/bin/ls.  It appears that there's TLS system calls in the binary 
itself, not just in the */lib/tls libraries:

...
brk(0)                                  = 0x805d000
brk(0x807e000)                          = 0x807e000
brk(0)                                  = 0x807e000
shutdown(1610612264, 81)                = -1 ENOSYS (Function not 
implemented)
modify_ldt(0x1, 0x5ffffe28, 0x10)       = -1 ENOSYS (Function not 
implemented)
write(2, "cannot set up thread-local stora"..., 36cannot set up 
thread-local storage: ) = 36
write(2, "cannot set up LDT for thread-loc"..., 43cannot set up LDT for 
thread-local storage
) = 43
write(2, "\n", 1
)                       = 1
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++

	The "modify_ldt" call looks ominous; In a perfect world, wouldn't the 
/bin/ls binary realize it didn't have any tls library support and not 
use TLS system calls?
	Yeah, right.  We can only hope.  :-)

	Any ideas?
	- A befuddled Marion and Bill




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