From: Oleg Nesterov Date: Mon, 14 Jan 2008 21:02:37 +0000 (+0300) Subject: fix the "remove task_ppid_nr_ns" commit X-Git-Tag: v2.6.24-rc8~13 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a98fdcef941e107eeabae622d85a1f476f25a160;p=pandora-kernel.git fix the "remove task_ppid_nr_ns" commit Commit 84427eaef1fb91704c7112bdb598c810003b99f3 (remove task_ppid_nr_ns) moved the task_tgid_nr_ns(task->real_parent) outside of lock_task_sighand(). This is wrong, ->real_parent could be freed/reused. Both ->parent/real_parent point to nothing after __exit_signal() because we remove the child from ->children list, and thus the child can't be reparented when its parent exits. rcu_read_lock() protects ->parent/real_parent, but _only_ if we know it was valid before we take rcu lock. Revert this part of the patch. Signed-off-by: Oleg Nesterov Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed