[Bug remote/15255] New: remote_read_qxfer hides remote errors

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15255

             Bug #: 15255
           Summary: remote_read_qxfer hides remote errors
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: remote
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jan.kratochvil@redhat.com
    Classification: Unclassified


Created attachment 6921
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6921
Simple artifical error in gdbserver.

Patch gdbserver by the attachment.
(gdb) record btrace
(gdb) step
(gdb) set debug remote 1
(gdb) record function-call-history 
Sending packet: $qXfer:btrace:read:new:0,fff#d3...Packet received: E.Must
select a single thread.
No trace.
(gdb) 

GDB could print: Must select a single thread.

It looks to me as:
remote_read_qxfer:
  if (packet_len < 0 || packet_ok (rs->buf, packet) != PACKET_OK)
    return -1;

PACKET_ERROR with "E." is not handled.

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