On Sat, Oct 08, 2022 at 11:05:48AM +0800, zhanchengbin wrote:
> If run the fsck -N command, processes don't execute, just show what
> would be done. However, the pid whose value is -1 is added to the
> instance_list list in the execute function,if the kill_all function
> is called later, kill(-1, signum) is executed, Signals are sent to
> all processes except the number one process and itself. Other
> processes will be killed if they use the default signal processing
> function.
>
> Signed-off-by: zhanchengbin <zhanchengbin1@xxxxxxxxxx>
> ---
> misc/fsck.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/misc/fsck.c b/misc/fsck.c
> index 4efe10ec..faf7789d 100644
> --- a/misc/fsck.c
> +++ b/misc/fsck.c
> @@ -546,6 +546,8 @@ static int kill_all(int signum)
> for (inst = instance_list; inst; inst = inst->next) {
> if (inst->flags & FLAG_DONE)
> continue;
> + if (inst->pid == -1)
> + continue;
That works, but I think we can afford to be a little defensive here.
Anything <= 0 is a bug and can have unexpected consequences if we
actually call the kill().
if (inst->pid <= 0)
continue;
Also as Darrick pointed out we need to send the patch to util-linux
(disk-utils/fsck.c) as well if you haven't already.
-Lukas
> kill(inst->pid, signum);
> n++;
> }
> --
> 2.27.0
>
