[Crash-utility] HEADS UP: upstream kernel pidhash removal
FYI, if you're running with bleeding edge upstream kernels, this
recent commit destroys a fundamental underpinning required by the
crash utility:
commit e8cfbc245e24887e3c30235f71e9e9405e0cfc39
Author: Gargi Sharma <gs051095(a)gmail.com>
Date: Fri Nov 17 15:30:34 2017 -0800
pid: remove pidhash
pidhash is no longer required as all the information can be looked up
from idr tree. nr_hashed represented the number of pids that had been
hashed. Since, nr_hashed and PIDNS_HASH_ADDING are no longer relevant,
it has been renamed to pid_allocated and PIDNS_ADDING respectively.
I'm not sure how the failure will manifest itself, but it certainly will
will fail early on during session initialization. When I saw the original
patch postings, I started tinkering with the creation of yet another
function to plug into "tt->refresh_task_table" for the new IDR/radix-tree
scheme, but until I see an actual live kernel and/or vmcore with the patch
above, I've held off on further work on it.
In the meantime, you can use the "crash --active" command line option,
which restricts the task list to those that are registered as the current
task in each per-cpu runqueue.
Dave