On 2015/10/23 17:45, Rui Xiang wrote: > Hi，list > > I encounter a panic about init process. > > 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. > > In our host, kswapd would be wake up while using a lot of memory, and then reclaim > some pages from init process. If we execute *"reboot"* or *"reboot -f"* to reboot > host through sysvinit, reboot process will call sys_reboot and shut down the sas > driver(disk), then will trigger the panic of init process. > > As follow, > > HOST reboot process init process > use a lot of memory > wake up kswapd > reclaim some pages > (these pages are code segment > or data segment of init process) > from init thread (pid=1) > reboot > sys_reboot > shutdown disk driver > init thread read data from disk Hi, Does anyone know will init thread read data from disk after shutdown the disk driver? Thanks, Xishi Qiu > page_fault > filemap_fault > readpage failed because the disk is closed > return VM_FAULT_SIGBUS > send signal SIGBUS > do_signal > do_exit > trigger the panic > > > It seems that reboot or force reboot through *sysvinit* have the problem. > Furthermore, using reboot -f in *systemd* should also have this problem, right? > > And is that a bug for current reboot process in sysvinit or systemd? > > All comments are welcome, thanks. > > . > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>