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Crash when using xencov

To: " xen-users@xxxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxxx>

From: Carmine Cesarano <c.cesarano@xxxxxxxxxx>

Date: Mon, 27 Jun 2022 11:34:13 +0000

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List-id: Xen user discussion <xen-users.lists.xenproject.org>

Thread-index: AQHYihZvzMoBU/8d5kCvfMcwSUXjJA==

Thread-topic: Crash when using xencov

I am having trouble retrieving xen coverage. I compiled and installed xen stable 4.16 on Debian 11, enabling support for coverage (using gcov).

To reproduce my scenario:

- make -C xen menuconfig

- disable flag /CommonFeatures/LivePatchingSupport.

- enable enable DebuggingOptions/CodeCoverageSupport.

Once xen is installed, if I run the xencov utility from dom0 userspace, or invoke the SYSCTL_coverage_op hypervcall I get a hypervisor crash resulting from a page fault in the function xc_sysctl().

Carmine.

Follow-Ups:

Re: Crash when using xencov
- From: Julien Grall