[Bug gdb/30825] New: GDB doesn't send Hg packet when switching the inferiors

["rajesh.palla at amd dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30825

            Bug ID: 30825
           Summary: GDB doesn't send Hg packet when switching the
                    inferiors
           Product: gdb
           Version: 12.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: rajesh.palla at amd dot com
  Target Milestone: ---

When we switch the inferiors using infe command, I am expecting GDB to send Hg
Packet to the remote stub so that the remote stub can work on the selected
inferior.

But GDB isn't sending the Hg packet every time. 
In a scenario where I have two inferiors, if I switch the inferiors without
doing any operation, I don't see Hg Packet after first time

infe 1
infe 2 
infe 1
infe 2

Output log:
GDB -> $Hgp1.1#af
GDB <- $OK#9a
GDB -> $g#67
GDB <- $0000000000e0030000.....#49


Is it expected to invalidate the pc register from regcache in
<arch>_unwind_pc(). Because if I do so, it works but that will add more latency
when we give step command etc..(it sends more g packets)

Any solution?

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