[Bug breakpoints/20133] New: unable to delete a sub-breakpoint

["zl29ah at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20133

            Bug ID: 20133
           Summary: unable to delete a sub-breakpoint
           Product: gdb
           Version: 7.11
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: zl29ah at gmail dot com
  Target Milestone: ---

(gdb) i break
Num     Type           Disp Enb Address    What
4       breakpoint     keep y   <MULTIPLE> 
        breakpoint already hit 1 time
4.1                         y     0x08002a90 in SVC_Handler at
../FreeRTOS/portable/GCC/ARM_CM3/port.c:246
4.2                         y     0x08008340 in SVC_Handler at
../FreeRTOS/portable/GCC/ARM_CM3/port.c:246
...
(gdb) del 4.1
warning: bad breakpoint number at or near '4.1'

I need to do this in order to free up the hardware breakpoint slots (only six
of them in my embedded system, so i'm kinda constrained).

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