UPSTREAM: exit: panic before exit_mm() on global init exit

Currently, when global init and all threads in its thread-group have exited
we panic via:
-> exit_notify()
   -> forget_original_parent()
      -> find_child_reaper()
This makes it hard to extract a useable coredump for global init from a
kernel crashdump because by the time we panic exit_mm() will have already
released global init's mm.
This patch moves the panic futher up before exit_mm() is called. As was the
case previously, we only panic when global init and all its threads in the
thread-group have exited.

Signed-off-by: chenqiwu <>
Acked-by: Christian Brauner <>
Acked-by: Oleg Nesterov <>
[ fix typo, rewrite commit message]
Signed-off-by: Christian Brauner <>
(cherry picked from commit 43cf75d96409a20ef06b756877a2e72b10a026fc)
Bug: 146789558
Change-Id: Icff81267e8c49bf1d332773351d1b47cb8cbac4a
Signed-off-by: Alistair Delva <>
1 file changed