On Tue, May 29, 2007 at 11:40:42AM -0400, Jeff Layton wrote:
> After spending quite a bit of time tracking down a "VFS: busy inodes
> after unmount" problem, it occurs to me that it would be nice to be
> able to force a panic when that occurs. While an oops message alone is
> not generally helpful for tracking down this sort of problem,
> collecting and analyzing a coredump when this occurs can be.
>
> The following patch adds a procfs tunable that allows you to force a
> core when a "busy inodes after umount" problem occurs. It also changes
> the classic error message to be something a bit less cryptic to users.
> @@ -303,10 +305,15 @@ void generic_shutdown_super(struct super_block *sb)
> sop->put_super(sb);
>
> /* Forget any remaining inodes */
> - if (invalidate_inodes(sb)) {
> - printk("VFS: Busy inodes after unmount of %s. "
> - "Self-destruct in 5 seconds. Have a nice day...\n",
> - sb->s_id);
> + if (busy = invalidate_inodes(sb)) {
> + printk("VFS: %d busy inodes after unmount of %s. ",
> + busy, sb->s_id);
> + if (umount_debug != 0) {
> + printk("Crashing host on request.\n");
> + BUG();
> + } else {
> + printk("This machine will likely crash
> eventually. Consider a reboot.\n");
> + }
You can add just BUG_ON here and do
echo 1 >/proc/sys/kernel/panic_on_oops
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