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What can cause SIGBUS (bus error) on a generic x86 userland application in Linux? All of the discussion I’ve been able to find online is regarding memory alignment errors, which from what I understand doesn’t really apply to x86.
(My code is running on a Geode, in case there are any relevant processor-specific quirks there.)
You can get a SIGBUS from an unaligned access if you turn on the unaligned access trap, but normally that’s off on an x86. You can also get it from accessing a memory mapped device if there’s an error of some kind.
Your best bet is using a debugger to identify the faulting instruction (SIGBUS is synchronous), and trying to see what it was trying to do.