Subject : 2.6.30-rc2: BUG: MAX_LOCKDEP_ENTRIES too low! when mounting rootfs Submitter : Alexander Beregalov <a.beregalov@gmail.com> Date : 2009-04-15 12:43 References : http://marc.info/?l=linux-kernel&m=123979949820538&w=4 This entry is being used for tracking a regression from 2.6.29. Please don't close it until the problem is fixed in the mainline.
Seen with 2.6.30-rc3 as well ... device-mapper: multipath: version 1.0.5 loaded BUG: MAX_LOCKDEP_ENTRIES too low! turning off the locking correctness validator. ... kernel/lockdep_internals.h:#define MAX_LOCKDEP_ENTRIES 8192UL Phil =--=
even doubled to 16384UL it fell over,.. either something is eating locks or something extremely bad is happening Phil =--=
Actually after talking with a few folk it seems that the whole lockdep system requirements have expanded massively since 2.6.20ish and no one has been bothered to resize the arrays accordingly Incidentally it would be nice to actually spit out the sizes used rather than just 'too low' Phil =--=
Created attachment 21128 [details] lockdep.c patch to be a little more informative when things bail out lockdep.c patch to be a little more informative when things bail out 'too low!' is extremely uninformative about what happened. esp as the values may change from kernel to kernel from what you might have expected
Notify-Also : Philip Copeland <bryce@zeniv.linux.org.uk>
Still present in rc6
On Monday 25 May 2009, Peter Zijlstra wrote: > On Sun, 2009-05-24 at 21:11 +0200, Rafael J. Wysocki wrote: > > This message has been generated automatically as a part of a report > > of recent regressions. > > > > The following bug entry is on the current list of known regressions > > from 2.6.29. Please verify if it still should be listed and let me know > > (either way). > > > > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=13126 > > Subject : BUG: MAX_LOCKDEP_ENTRIES too low! when mounting > rootfs > > Submitter : Alexander Beregalov <a.beregalov@gmail.com> > > Date : 2009-04-15 12:43 (40 days old) > > References : http://marc.info/?l=linux-kernel&m=123979949820538&w=4 > > -rc7 includes: > > Ingo Molnar (1): > lockdep: increase MAX_LOCKDEP_ENTRIES and MAX_LOCKDEP_CHAINS > > Which can be found with commit id: > d80c19df5fcceb8c741e96f09f275c2da719efef