On Wed, Nov 23, 2016 at 02:58:45PM -0500, Dave Jones wrote:
> On Wed, Nov 23, 2016 at 02:34:19PM -0500, Dave Jones wrote:
> > [ 317.689216] BUG: Bad page state in process kworker/u8:8 pfn:4d8fd4
> > trace from just before this happened. Does this shed any light ?
> > https://codemonkey.org.uk/junk/trace.txt
> crap, I just noticed the timestamps in the trace come from quite a bit
> later. I'll tweak the code to do the taint checking/ftrace stop after
> every syscall, that should narrow the window some more.
> Getting closer..
Ok, this is getting more like it.
Also same bug, different run, but a different traceview
(function-graph screws up the RIP for some reason, 'return_to_handler'
should actually be btrfs_destroy_inode)
Anyways, I've got some code that works pretty well for dumping the
ftrace buffer now when things go awry. I just need to run it enough
times that I hit that bad page state instead of this, or a lockdep bug first.