Oleg Nesterov <[email protected]> writes:
> ptrace_stop() decrements ->group_stop_count to "participate" in group stop.
> This looks very wrong to me, the task can in fact decrement this counter twice.
> If the tracee returns to the user-space before other threads complete the group
> stop, it will notice TIF_SIGPENDING and do it again.
This is one of those interesting weird cases. The ptrace interface remains per
task.
So need to handle a simultaneous thread group stop and a per task stop.
>
> Another problem is that we don't set SIGNAL_STOP_STOPPED if the counter becomes
> zero.
>
> I must admit, I don't undestand the reason why this code was added, it is very
> old.
I haven't dug in enough yet to understand better, but it is my hunch we
need to do something when we have both kinds of stop happening simultaneously.
Eric
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
