在x86 Linux上调试SIGBUS [英] Debugging SIGBUS on x86 Linux

问题描述

在Linux中的通用x86用户空间应用程序中，什么可能导致SIGBUS（总线错误）？所有在网上找到的讨论都是关于内存对齐错误的，这是我理解的并不适用于x86的。

（我的代码是运行在 Geode ，以防有任何相关的特定于处理器的怪癖。 ）

解决方案

如果您打开未对齐的访问陷阱，您可以从未对齐的访问获取SIGBUS，但通常情况下x86。如果有某种错误，您也可以从访问内存映射设备获取它。

最好的办法是使用调试器来识别故障指令（SIGBUS是同步的），并试图看看它正在做什么。

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.)

解决方案

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.

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