[Bug gdb/21169] New: GDBServer on ARM can crash the inferior while single stepping

["antoine.tremblay at ericsson dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21169

            Bug ID: 21169
           Summary: GDBServer on ARM can crash the inferior while single
                    stepping
           Product: gdb
           Version: 8.0
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: antoine.tremblay at ericsson dot com
  Target Milestone: ---

Single stepping on ARM with GDBServer can crash the inferior.

The inferior will cash with SIGILL or SIGSEGV.

This is due to the single stepping breakpoint insertion not being atomic in
certain situations like inserting a thumb2 breakpoint on a 2 byte aligned
address.

See this thread on the mailing list for more info:
https://sourceware.org/ml/gdb-patches/2017-01/msg00650.html

See also:
https://sourceware.org/ml/gdb-patches/2016-11/msg00230.html

This is a regression compared to previous GDB since before GDBServer did not do
the single stepping itself.  GDB controlled the single-stepping and thus all
threads are stopped when modifying memory, this avoided this crash.

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