[uml-devel] Does UML 2.6.14 work under x86-64?

[Rob Landley <rob@landley.net>]

David Lang is trying to get my firmware build working under x86-64, and when I 
upgraded him to 2.6.14 (to get around the memory leak in 2.6.13.2), he 
started getting this:

>> Checking PROT_EXEC mmap in /tmp...OK
>> Checking for the skas3 patch in the host:
>>    - /proc/mm...not found
>>    - PTRACE_FAULTINFO...not found
>>    - PTRACE_LDT...not found
>> UML running in SKAS0 mode
>> Kernel panic - not syncing: get_skas_faultinfo : failed to wait for
>> SIGUSR1/SIGTRAP, pid = 16411, n = 16411, errno
>>   0, status = 0xb7f

This is 2.6.14 configured like so:

make ARCH=um allnoconfig &&
cat >> .config << EOF &&
CONFIG_MODE_SKAS=y
CONFIG_BINFMT_ELF=y
CONFIG_HOSTFS=y
CONFIG_SYSCTL=y
CONFIG_STDERR_CONSOLE=y
CONFIG_UNIX98_PTYS=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_UBD=y
CONFIG_TMPFS=y
CONFIG_SWAP=y
CONFIG_LBD=y
CONFIG_EXT2_FS=y
CONFIG_PROC_FS=y
EOF
yes "" | make ARCH=um oldconfig &&
make ARCH=um

And then run via:

tmpdir/linux rootfstype=hostfs rw quiet mem=64M ubd0=tmpdir/swap.img 
init=/bin/sh

He first tried with the LDT patch applied.  Then he tried reverting it (and 
adding LD_ASSUME_KERNEL=2.4.1 to the kernel command line), but that didn't 
help.

Any clues?  (Should I tell him to just try -tt mode?  Or revert to 2.6.13 with 
the leak fix?)

Rob


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