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Tom reported that one of the GDB test-cases failed, and Boris bisected it to commit:d53d9bc0cf("x86/debug: Change thread.debugreg6 to thread.virtual_dr6") The debugging session led us to commit:6c0aca288e("x86: Ignore trap bits on single step exceptions") It turns out that TF and data breakpoints are both traps and will be merged, while instruction breakpoints are faults and will not be merged. This means6c0aca288eis wrong, only TF and instruction breakpoints need to be excluded while TF and data breakpoints can be merged. [ bp: Massage commit message. ] Fixes:d53d9bc0cf("x86/debug: Change thread.debugreg6 to thread.virtual_dr6") Fixes:6c0aca288e("x86: Ignore trap bits on single step exceptions") Reported-by: Tom de Vries <tdevries@suse.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: <stable@vger.kernel.org> Link: https://lkml.kernel.org/r/YBMAbQGACujjfz%2Bi@hirez.programming.kicks-ass.net Link: https://lkml.kernel.org/r/20210128211627.GB4348@worktop.programming.kicks-ass.net
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.