[Bug breakpoints/12312] New: repeated watchpoints hits with breakpoint always-inserted
jan.kratochvil at redhat dot com
sourceware-bugzilla@sourceware.org
Sun Dec 12 07:55:00 GMT 2010
http://sourceware.org/bugzilla/show_bug.cgi?id=12312
Summary: repeated watchpoints hits with breakpoint
always-inserted
Product: gdb
Version: HEAD
Status: NEW
Severity: normal
Priority: P2
Component: breakpoints
AssignedTo: unassigned@sourceware.org
ReportedBy: jan.kratochvil@redhat.com
Host: x86_64-fedora14-linux-gnu
Target: x86_64-fedora14-linux-gnu
There was a fix:
[patch 1/4] Fix hw watchpoints #2: [x86*] repeated rwatch output
http://sourceware.org/ml/gdb-patches/2009-11/msg00350.html
which fixes it for breakpoint always-inserted off. But for breakpoint
always-inserted on it still broken:
echo 'int a;f(){}main(){a=0;f();}'|gcc -g -x c -;gdb -q -nx -ex 'set breakpoint
always-inserted on' ./a.out -ex start -ex 'awatch a' -ex 'b f' -ex c -ex c
[...]
Continuing.
Hardware access (read/write) watchpoint 2: a
Value = 0
0x0000000000400488 in main () at <stdin>:1
1 in <stdin>
Continuing.
Hardware access (read/write) watchpoint 2: a
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ = bogus second hit
Value = 0
Breakpoint 3, f () at <stdin>:1
1 in <stdin>
In fact even in breakpoint always-inserted off the change is wrong as GDB may
stop without dealing with such event now, it may delay any event till the next
stop.
FYI bpstat evaluations vs. breakpoint hits
http://sourceware.org/ml/archer/2010-q4/msg00026.html
But I do not have a reproducer for it now.
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