Debugging SIGBUS on x86 Linux

linux debugging bus-error sigbus
Josh Kelley picture Josh Kelley · Jan 18, 2010 · Viewed 35.8k times · Source

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.)

Answer

caf picture caf · Jan 19, 2010

SIGBUS can happen in Linux for quite a few reasons other than memory alignment faults - for example, if you attempt to access an mmap region beyond the end of the mapped file.

Are you using anything like mmap, shared memory regions, or similar?

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