Hi all,
I am trying to send a SIGKILL to a kernel module which is sleeping.
I added a printk after the sleep command.
Sending a SIGLKILL (by kill -9 SIGLKILL pidOfKernelThread) does **not**
yield the message from printk("calling do_exit\n");
which is immediately after the msleep() command, as I expected.
Moreover, ps before and after the kill show 'D' in the STAT column
(STATUS), which means that the process is sleeping (If I am not
wrong).
Any ideas why ?
below is the code:
#include<linux/init.h>
#include<linux/module.h>
#include<linux/kernel.h>
#include<linux/kthread.h>
#include<linux/sched.h>
#include <linux/delay.h>
struct task_struct *task;
int thread_function(void *data)
{
int exit_sig = SIGKILL;
allow_signal(SIGKILL);
printk("in %s\n",__func__);
// sleep for a second
msleep(60000);
printk("calling do_exit\n");
do_exit(exit_sig);
return 0;
}
static int kernel_init(void)
{
task = kthread_create(thread_function,NULL,"MY_KERNEL_THREAD");
return 0;
}
static void kernel_exit(void)
{
printk("in kernel_exit\n");
kthread_stop(task);
}
module_init(kernel_init);
module_exit(kernel_exit);
MODULE_AUTHOR("Tester");
MODULE_DESCRIPTION("test");
MODULE_LICENSE("GPL");
rgs,
Kevin
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