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garbage collection thread zombies
I noticed this problem when using a writeable jffs2 rootfs. If you remount
it as read-only later, the garbage collection thread becomes a zombie that
never gets reaped. Killing the kernel thread has the same result (for
The problem appears to be that the kernel thread is started before the init
process is exec'd, and it's parent task is not set correctly so when init
goes to reap it, the wait4(...) call returns successfully, but doesn't
actually remove the zombie. I am using a 2.4 kernel, but the problem
probably occurs in 2.6 as well.
The following patch fixes the problem. Please apply.
--- mtd.cvs/fs/jffs2/background.c 2004-02-24 08:08:07.000000000 -0600
+++ mtd/fs/jffs2/background.c 2004-03-12 13:00:04.000000000 -0600
@@ -142,6 +142,7 @@
c->gc_task = NULL;
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