gdb doesn't stop at a hardware watchpoint on a memory location
Date: Tue, 8 Jan 2019 12:48:39 +0000
Message-ID: <101926_1546951735_5C349C37_101926_2682_1_8227a6b0c2c946ae879c802df606d49b_at_vontobel.com>
As you may see in the subject, my question isn't directly related to the Oracle database. However, some contributors to the list regularly use gdb for troubleshooting Oracle.
So, I hope it's not completely inappropriate to post this gdb related question here.
The problem I have is that the execution isn't stopped when the watched memory location gets changed.
You can find the detailed description below.
First, I'll inspect the content of the memory location 0x117510e20:
p/x *0x117510e20
$398 = 0x1000000
Then I'll set the hardware watchpoint on this address:
(gdb) wa *0x117510e20
Hardware watchpoint 171: *0x117510e20
As you can see, the watchpoint 171 is enabled: (gdb) info watch
Num Type Disp Enb Address What 171 hw watchpoint keep y *0x117510e20
Finally, I'll continue execution until the next breakpoint is reached:
continue
Breakpoint 166, ... in ...
Unexpectedly, the data in the memory location changed without triggering the watchpoint:
(gdb) p/x *0x117510e20
$399 = 0x5000000
Can anybody explain why the watchpoint is not being triggered in this case?
I'm using the following gdb version on Solaris 11.3:
$ gdb --version
GNU gdb (GDB) 7.6
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i386-pc-solaris2.11".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Best regards,
Nenad
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-- http://www.freelists.org/webpage/oracle-lReceived on Tue Jan 08 2019 - 13:48:39 CET