On Tue, Aug 28, 2012 at 09:11:57PM -0700, Eric Dumazet wrote:
> On Tue, 2012-08-28 at 23:38 +0300, Alexey Dobriyan wrote:
>
> > Nothing can stop RCU!
> >
> > After running "modprobe;rmmod" in a loop and "cat" in another loop for a while
> > rmmod got stuck in D-state inside remove_proc_entry() with trace amounts of CPU time
> > being consumed.
> >
> > It didn't oopsed, though.
>
> Thanks !
>
> I'll polish this patch once LKS/LPC is over...
>
> What particular module and/or proc file did you use for your tests ?
Just dummy one.
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
static int foo_proc_show(struct seq_file *m, void *v)
{
seq_puts(m, "foo\n");
return 0;
}
static int foo_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, foo_proc_show, NULL);
}
static const struct file_operations foo_proc_ops = {
.open = foo_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init foo_module_init(void)
{
proc_create("foo", 0, NULL, &foo_proc_ops);
return 0;
}
static void __exit foo_module_exit(void)
{
remove_proc_entry("foo", NULL);
}
module_init(foo_module_init);
module_exit(foo_module_exit);
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