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Subject[2.6.31-rc2] hitting lockdep limits...
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Running 2.6.31-rc2, lockdep hits it's 2^18 stack trace limit [1],
giving a warning [2]. It's clear the stacktrace here has no connection
to the root problem.

Nothing jumps out of the lockdep /proc files for what's eating up the
limit - what's best to check for?

Thanks,
Daniel

--- [1]
# cat lockdep_stats
lock-classes: 2034 [max: 8191]
direct dependencies: 8142 [max: 16384]
indirect dependencies: 41755
all direct dependencies: 886855
dependency chains: 7094 [max: 32768]
dependency chain hlocks: 18066 [max: 163840]
in-hardirq chains: 1477
in-softirq chains: 617
in-process chains: 4221
stack-trace entries: 262144 [max: 262144]
combined max dependencies: 3856391688
hardirq-safe locks: 1063
hardirq-unsafe locks: 407
softirq-safe locks: 1088
softirq-unsafe locks: 366
irq-safe locks: 1096
irq-unsafe locks: 407
hardirq-read-safe locks: 0
hardirq-read-unsafe locks: 47
softirq-read-safe locks: 0
softirq-read-unsafe locks: 47
irq-read-safe locks: 0
irq-read-unsafe locks: 47
uncategorized locks: 107
unused locks: 0
max locking depth: 9
max recursion depth: 9
chain lookup misses: 7094
chain lookup hits: 5316747
cyclic checks: 59293
cyclic-check recursions: 39761
find-mask forwards checks: 16333
find-mask forwards recursions: 5897
find-mask backwards checks: 305195
find-mask backwards recursions: 363516
hardirq on events: 6449896
hardirq off events: 6449901
redundant hardirq ons: 0
redundant hardirq offs: 6903417
softirq on events: 22975
softirq off events: 23003
redundant softirq ons: 0
redundant softirq offs: 0
debug_locks: 0

--- [2]
BUG: MAX_STACK_TRACE_ENTRIES too low!

turning off the locking correctness validator.

Pid: 2677, comm: rpc.statd Not tainted 2.6.31-rc2-272c #1

Call Trace:

[<ffffffff8101ad9f>] ? save_stack_trace+0x2f/0x50
[<ffffffff8109c4be>] save_trace+0xbe/0xd0
[<ffffffff8109c528>] add_lock_to_list+0x58/0xf0
[<ffffffff81114d6b>] ? get_page_from_freelist+0x4db/0xa70
[<ffffffff810a0870>] __lock_acquire+0xe40/0x1250
[<ffffffff810a0d9e>] lock_acquire+0x11e/0x170
[<ffffffff81114d6b>] ? get_page_from_freelist+0x4db/0xa70
[<ffffffff81695110>] _spin_lock_irqsave+0x60/0xa0
[<ffffffff81114d6b>] ? get_page_from_freelist+0x4db/0xa70
[<ffffffff81114d6b>] get_page_from_freelist+0x4db/0xa70
[<ffffffff8111556b>] __alloc_pages_nodemask+0x26b/0x880
[<ffffffff81143bec>] alloc_pages_current+0x8c/0xe0
[<ffffffff8114a922>] new_slab+0x382/0x390
[<ffffffff8114c2d3>] __slab_alloc+0x203/0x6d0
[<ffffffff815a7dce>] ? neigh_create+0x7e/0x690
[<ffffffff815a7dce>] ? neigh_create+0x7e/0x690
[<ffffffff8114d119>] kmem_cache_alloc+0x269/0x280
[<ffffffff81071c69>] ? local_bh_enable_ip+0x119/0x1e0
[<ffffffff815a7dce>] neigh_create+0x7e/0x690
[<ffffffff81694cee>] ? _read_unlock_bh+0x3e/0x50
[<ffffffff815a5a69>] ? neigh_lookup+0x179/0x190
[<ffffffff81608dca>] arp_bind_neighbour+0xca/0xd0
[<ffffffff815d9451>] rt_intern_hash+0x141/0x570
[<ffffffff8109efbd>] ? trace_hardirqs_on+0xd/0x10
[<ffffffff815dbcb7>] __ip_route_output_key+0x6b7/0xbc0
[<ffffffff816990a2>] ? sub_preempt_count+0x142/0x150
[<ffffffff815dc1e1>] ip_route_output_flow+0x21/0x70
[<ffffffff816077e4>] udp_sendmsg+0x7c4/0x940
[<ffffffff81322642>] ? debug_smp_processor_id+0x42/0x120
[<ffffffff8160fb6a>] inet_sendmsg+0x4a/0x90
[<ffffffff81587da4>] sock_sendmsg+0xe4/0x110
[<ffffffff81086ea0>] ? autoremove_wake_function+0x0/0x40
[<ffffffff8109fd08>] ? __lock_acquire+0x2d8/0x1250
[<ffffffff810cd041>] ? audit_sockaddr+0x51/0x110
[<ffffffff8158852c>] ? move_addr_to_kernel+0x5c/0x60
[<ffffffff81588c0f>] sys_sendto+0x11f/0x190
[<ffffffff8100d039>] ? retint_swapgs+0x13/0x1b
[<ffffffff8109ef4d>] ? trace_hardirqs_on_caller+0x17d/0x1e0
[<ffffffff81694a9e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff8100c4f2>] system_call_fastpath+0x16/0x1b
--
Daniel J Blueman


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