[Bug tdep/29868] [gdb/tdep, s390x] breakpoint.c:5784: internal-error: bpstat_stop_status_nowatch: Assertion `!target_stopped_by_watchpoint ()'

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29868

--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #2)
> we try to clear the watch point status in
> s390_linux_nat_target::stopped_by_watchpoint to make sure that we "Do not
> report this watchpoint again".  That doesn't seem to have any effect though,

And that seems to be documented behaviour, in ./arch/s390/kernel/ptrace.c, in
__poke_user_per we have:
...
        /*                                                                      
         * There are only three fields in the per_info struct that the          
         * debugger user can write to.                                          
         * 1) cr9: the debugger wants to set a new PER event mask               
         * 2) starting_addr: the debugger wants to set a new starting           
         *    address to use with the PER event mask.                           
         * 3) ending_addr: the debugger wants to set a new ending               
         *    address to use with the PER event mask.                           
         * The user specified PER event mask and the start and end              
         * addresses are used only if single stepping is not in effect.         
         * Writes to any other field in per_info are ignored.                   
         */
...

So, the bits that we're trying to clear here in per_struct.lowcore, after the
fields listed above.

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