Messages in this thread | | | Date | Fri, 18 Dec 2009 23:28:42 +0530 | From | "K.Prasad" <> | Subject | Re: x86: do_debug && PTRACE_SINGLESTEP broken by 08d68323d1f0c34452e614263b212ca556dae47f |
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On Fri, Dec 18, 2009 at 06:27:47PM +0100, Oleg Nesterov wrote: > On 12/18, Frederic Weisbecker wrote: > > > > On Fri, Dec 18, 2009 at 01:56:50AM +0100, Oleg Nesterov wrote: > > > Hi.
<snipped>
> > Single stepping works well for me, after a quick check on > > gdb. How did you trigger the bug? > > Please find the trivial test-case below. It hangs, because > PTRACE_SINGLESTEP doesn't trigger the trap. >
aah...my other mail just criss-crossed yours.
I quickly ran on the said x86 box, loaded with -tip (commit 7818b3d0fc68f5c2a85fed86d9fa37131c5a3068) and it runs fine.
[root@llm05 prasadkr]# cat oleg.c #include <stdio.h> #include <unistd.h> #include <signal.h> #include <sys/ptrace.h> #include <sys/wait.h> #include <assert.h>
int main(void) { int pid, status, i;
pid = fork(); if (!pid) for (;;);
sleep(1); assert(ptrace(PTRACE_ATTACH, pid, 0,0) == 0);
assert(pid == wait(&status)); assert(WIFSTOPPED(status));
for (i = 0; i < 10; ++i) { assert(ptrace(PTRACE_SINGLESTEP, pid, 0,0) == 0);
printf("wait %d ...\n", i); assert(pid == wait(&status));
assert(WIFSTOPPED(status) && WSTOPSIG(status) == SIGTRAP); }
kill(pid, SIGKILL); return 0; }
[root@llm05 prasadkr]# gcc -o oleg oleg.c -g -Wall [root@llm05 prasadkr]# ./oleg wait 0 ... wait 1 ... wait 2 ... wait 3 ... wait 4 ... wait 5 ... wait 6 ... wait 7 ... wait 8 ... wait 9 ... [root@llm05 prasadkr]#
Am I missing something here?
Thanks, K.Prasad
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