Re: [Crash-utility] crash problems with linux-4.5

> > > Hi, > > > > > > Just forcing a crash dump via 'echo c > /proc/sysrq-trigger' results in a crash > > > dump that has no tasks saved. I see _lots_ of these errors when loading the > > > dump with the latest crash from the git repo: > > > > > > crash: page excluded: kernel virtual address: ffff88103c5a9000 type: "fill_task_struct" > > > WARNING: active task ffff881078a04340 on cpu 3 not found in PID hash > > > > > > Then nothing is in the dump: > > > > > > crash> ps > > > PID PPID CPU TASK ST %MEM VSZ RSS COMM > > > > 0 0 0 ffffffff81c0f4c0 RU 0.0 0 0 [swapper/0] > > > crash> > > > > > > Any ideas? > > > > > > I'm using top-o-tree from Dave's git repo > > > https://github.com/crash-utility/crash.git: > > > > > > commit 04ab5c560a58246e782509d99214afcaf8462b4c > > > Author: Dave Anderson <anderson(a)redhat.com&gt; > > > Date: Tue Mar 1 16:16:48 2016 -0500 > > > > > > Put 2016 copyright in initial banner. > > > > > > > > > Thanks, > > > > > > Steve. > > > > If you have configured kdump to use makedumpfile -d31, it is probably this: > > > > [Crash-utility] makedumpfile: 4.5 kernel commit breaks page filtering > > https://www.redhat.com/archives/crash-utility/2016-February/msg00009.html > > > > > PS: I'm not on the crash-utility list, so please include my email in any > > > replies. > > > > PS: if you're using crash on bleeding edge kernels, you might want to join > > the list, at least in digest mode. > > Thanks Dave. I've joined. :) > > I changed the makedumpfile line in /etc/init.d/kdump from -d 31 to -d 17, > then removed the kdump initrd from /boot, and restarted kdump to generate > the new initrd file. I then rebooted, and produced a new crash dump. But > I'm still seeing the same issue. > > Am I doing the correct procedure for forcing makedumpfile to use -d17? I think so, yes. And downgrading to -d17 seems to have worked, at least for the two reporter on this list. You can verify that the -d configuration is as expected by entering: crash> help -D | grep dump_level