Messages in this thread |  | | | Date | Sun, 5 Jul 2009 19:19:34 +0100 | | Subject | [2.6.31-rc2] hitting lockdep limits... | | From | Daniel J Blueman <> |
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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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