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[Bug threads/10729] New: non-stop && hw-watchpoint: Couldn't write debug register: No such process.
- From: "jan dot kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: 3 Oct 2009 08:56:54 -0000
- Subject: [Bug threads/10729] New: non-stop && hw-watchpoint: Couldn't write debug register: No such process.
- Reply-to: sourceware-bugzilla at sourceware dot org
Hardware watchpoints are now global, they are carbon-copied to each LWP.
If any of the LWPs are currently not stopped the carbon-copying fails.
Either the running LWPs should be left with stale hw-watchpoints (probably not)
or the running LWPs should be rather transparently temporarily stopped for a
moment to update their hardware watchpoint registers.
------------------------------------------------------------------------------
(gdb) set non-stop on
(gdb) set target-async on
(gdb) b start
Breakpoint 1 at 0x400620: file /home/jkratoch/t/x2.c, line 9.
(gdb) r
Starting program: /home/jkratoch/t/x2
[Thread debugging using libthread_db enabled]
[New Thread 0x7ffff7fe2910 (LWP 20704)]
Breakpoint 1, start (arg=0x0) at /home/jkratoch/t/x2.c:9
9 sleep (1);
(gdb) info threads
2 Thread 0x7ffff7fe2910 (LWP 20704) start (arg=0x0) at /home/jkratoch/t/x2.c:9
* 1 Thread 0x7ffff7fe36f0 (LWP 20701) (running)
(gdb) thread 2
[Switching to thread 2 (Thread 0x7ffff7fe2910 (LWP 20704))]#0 start (arg=0x0)
at /home/jkratoch/t/x2.c:9
9 sleep (1);
(gdb) watch var
Hardware watchpoint 2: var
(gdb) c
Continuing.
Couldn't write debug register: No such process.
(gdb)
------------------------------------------------------------------------------
#include <pthread.h>
#include <assert.h>
#include <unistd.h>
static volatile int var;
static void *start (void *arg)
{
sleep (1);
var = 1;
return arg;
}
int main (void)
{
pthread_t thread1;
int i;
i = pthread_create (&thread1, NULL, start, NULL);
assert (i == 0);
i = pthread_join (thread1, NULL);
assert (i == 0);
return 0;
}
--
Summary: non-stop && hw-watchpoint: Couldn't write debug
register: No such process.
Product: gdb
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: threads
AssignedTo: unassigned at sourceware dot org
ReportedBy: jan dot kratochvil at redhat dot com
CC: gdb-prs at sourceware dot org
GCC host triplet: x86_64-fedora11-linux-gnu
GCC target triplet: x86_64-fedora11-linux-gnu
http://sourceware.org/bugzilla/show_bug.cgi?id=10729
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