linux-kernel - Re: lockdep: BUG: MAX_LOCKDEP

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Message-ID: <52B2FC66.9010309@oracle.com>
Date:	Thu, 19 Dec 2013 09:02:14 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: lockdep: BUG: MAX_LOCKDEP_ENTRIES too low!

On 12/19/2013 05:34 AM, Peter Zijlstra wrote:
> On Thu, Dec 19, 2013 at 12:53:56AM -0500, Sasha Levin wrote:
>> Hi all,
>>
>> I think that my bloated kernel managed to create way too many entries in the
>> dependency table. If that sounds right, I can send a patch to increase those.
>>
>> Attached /proc/lock_stat as requested as well.
>
> /proc/lockdep_stats not lock_stat :-)
>
> Do you still happen to have that?

Is the BUG message intentional ("Please attach the output of /proc/lock_stat to the bug report")?

Here's /proc/lockdep_stats:

  lock-classes:                         2397 [max: 8191]
  direct dependencies:                 16384 [max: 16384]
  indirect dependencies:               60481
  all direct dependencies:            308079
  dependency chains:                   21162 [max: 32768]
  dependency chain hlocks:             67298 [max: 163840]
  in-hardirq chains:                      51
  in-softirq chains:                     430
  in-process chains:                   19782
  stack-trace entries:                235133 [max: 262144]
  combined max dependencies:       443376596
  hardirq-safe locks:                     59
  hardirq-unsafe locks:                 1285
  softirq-safe locks:                    156
  softirq-unsafe locks:                 1136
  irq-safe locks:                        168
  irq-unsafe locks:                     1285
  hardirq-read-safe locks:                 4
  hardirq-read-unsafe locks:             357
  softirq-read-safe locks:                 7
  softirq-read-unsafe locks:             337
  irq-read-safe locks:                     8
  irq-read-unsafe locks:                 357
  uncategorized locks:                   281
  unused locks:                            0
  max locking depth:                      12
  max bfs queue depth:                   663
  chain lookup misses:                 21432
  chain lookup hits:               490237032
  cyclic checks:                       20219
  find-mask forwards checks:           12353
  find-mask backwards checks:         128734
  hardirq on events:               372837372
  hardirq off events:              372837362
  redundant hardirq ons:                3467
  redundant hardirq offs:          361517382
  softirq on events:                 3688513
  softirq off events:                3688541
  redundant softirq ons:                   0
  redundant softirq offs:                  0
  debug_locks:                             0


Thanks,
Sasha
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