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Subject[RFC] panic when reboot the system
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000007

Pid: 1, comm: init Tainted: G R O 3.4.24.19-0.11-default #1
Call Trace:
[<ffffffff8144dd24>] panic+0xc1/0x1e2
[<ffffffff8104483b>] do_exit+0x7db/0x8d0
[<ffffffff81044c7a>] do_group_exit+0x3a/0xa0
[<ffffffff8105394b>] get_signal_to_deliver+0x1ab/0x5e0
[<ffffffff81002270>] do_signal+0x60/0x5f0
[<ffffffff8145bf97>] ? do_page_fault+0x4a7/0x4d0
[<ffffffff81170d2c>] ? poll_select_copy_remaining+0xec/0x140
[<ffffffff81002885>] do_notify_resume+0x65/0x80
[<ffffffff8124ca7e>] ? trace_hardirqs_on_thunk+0x3a/0x3c
[<ffffffff814587ab>] retint_signal+0x4d/0x92


The system has a little memory left, then reboot it, and get the panic.
Perhaps this is a bug and trigger it like this and the latest kernel maybe
also have the problem.

use a lot of memory
wake up kswapd()
reclaim some pages from init thread (pid=1)
reboot
shutdown the disk
init thread read data from disk
page fault, because the page has already reclaimed
receive SIGBUS, and init thread exit
trigger the panic


Thanks,
Xishi Qiu



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