I just installed 9.1 (absolutely stock) for work. I tried to compile
one of my own tools on it, and it crashes. (This is on amd64.)
gdb says the stack trace looks like
#0 0x00007e9f36d6791a in _lwp_kill () from /usr/lib/libc.so.12
#1 0x00007e9f36d671ca in abort () at /usr/src/lib/libc/stdlib/abort.c:74
#2 0x00007e9f3720294c in __enable_execute_stack (addr=0x7f7fff724f94)
at enable-execute-stack.c:77
with the next frame's pc being in the entry prologue of a function that
contains a nested function, so presumably it's failing when trying to
enable execution for the stack trampoline.
Presumably this is NetBSD trying to break execute-out-of-the-stack
malware. This is not an unreasonable default, but, for this use case,
it's a crippling misfeature. How do I disable it? sysctl -a output
contains nothing promising (I looked for "exec" and "stack"); neither
does the usr/src/sys/arch/amd64/conf/GENERIC (same searches).
If this belongs somewhere other than tech-userlevel, just point me in
the correct direction....
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