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Date: Tue, 17 Oct 2006 17:55:22 +0530
From: Srinivasa Ds <srinivasa@in.ibm.com>
Organization: IBM
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To: Larry Finger <Larry.Finger@lwfinger.net>
CC: LKML <linux-kernel@vger.kernel.org>
Subject: Re: BUG in 2.6.18.1?
References: <4532BBDF.9010800@lwfinger.net>
In-Reply-To: <4532BBDF.9010800@lwfinger.net>
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Lock-validator code uses recursive functions to verify lock 
dependencies. And one should have some limit for recursive 
function,otherwise stack may get overflowed. So at any case 20 is the 
max depth for this recursive functions. But this value doesn't scale up 
for 16-way or 32-way SMP systems. Hence this bug.

Larry Finger wrote:
> Running 2.6.18.1, I got the following warning in my log:
>
> Oct 15 16:24:38 larrylap kernel: BUG: warning at 
> kernel/lockdep.c:565/print_infinite_recursion_bug()
> Oct 15 16:24:38 larrylap kernel:  [<c0103b3f>] 
> show_trace_log_lvl+0x1af/0x1d0
> Oct 15 16:24:38 larrylap kernel:  [<c0104f4b>] show_trace+0x1b/0x20
> Oct 15 16:24:38 larrylap kernel:  [<c0104f76>] dump_stack+0x26/0x30
> Oct 15 16:24:38 larrylap kernel:  [<c0131099>] 
> print_infinite_recursion_bug+0x49/0x50
> Oct 15 16:24:38 larrylap kernel:  [<c01311d5>] 
> find_usage_backwards+0x65/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131e27>] check_usage+0x27/0x280
> Oct 15 16:24:38 larrylap kernel:  [<c01337a0>] __lock_acquire+0xac0/0xdc0
> Oct 15 16:24:38 larrylap kernel:  [<c0133e18>] lock_acquire+0x68/0x90
> Oct 15 16:24:38 larrylap kernel:  [<c0310788>] 
> _spin_lock_irqsave+0x48/0x60
> Oct 15 16:24:38 larrylap kernel:  [<c0112713>] 
> change_page_attr+0x13/0x260
> Oct 15 16:24:38 larrylap kernel:  [<c0112996>] kernel_map_pages+0x36/0xa0
> Oct 15 16:24:38 larrylap kernel:  [<c0146c68>] 
> free_hot_cold_page+0x98/0x130
> Oct 15 16:24:38 larrylap kernel:  [<c0146d5a>] free_hot_page+0xa/0x10
> Oct 15 16:24:38 larrylap kernel:  [<c0146d8a>] __free_pages+0x2a/0x40
> Oct 15 16:24:38 larrylap kernel:  [<c0146dce>] free_pages+0x2e/0x40
> Oct 15 16:24:38 larrylap kernel:  [<c015ac39>] kmem_freepages+0x79/0xa0
> Oct 15 16:24:38 larrylap kernel:  [<c015c242>] slab_destroy+0x112/0x1a0
> Oct 15 16:24:38 larrylap kernel:  [<c015c424>] free_block+0x154/0x1a0
> Oct 15 16:24:38 larrylap kernel:  [<c015c5b2>] 
> cache_flusharray+0x72/0x150
> Oct 15 16:24:38 larrylap kernel:  [<c015c106>] kmem_cache_free+0xb6/0xe0
> Oct 15 16:24:38 larrylap kernel:  [<c015c277>] slab_destroy+0x147/0x1a0
> Oct 15 16:24:38 larrylap kernel:  [<c015c424>] free_block+0x154/0x1a0
> Oct 15 16:24:38 larrylap kernel:  [<c015c5b2>] 
> cache_flusharray+0x72/0x150
> Oct 15 16:24:38 larrylap kernel:  [<c015c106>] kmem_cache_free+0xb6/0xe0
> Oct 15 16:24:38 larrylap kernel:  [<c01d59df>] 
> ext3_destroy_inode+0x1f/0x30
> Oct 15 16:24:38 larrylap kernel:  [<c017a02b>] destroy_inode+0x2b/0x60
> Oct 15 16:24:38 larrylap kernel:  [<c017aae1>] dispose_list+0x81/0x100
> Oct 15 16:24:38 larrylap kernel:  [<c017ad50>] 
> shrink_icache_memory+0x1f0/0x230
> Oct 15 16:24:38 larrylap kernel:  [<c0149c72>] shrink_slab+0x122/0x190
> Oct 15 16:24:38 larrylap kernel:  [<c014ad87>] kswapd+0x297/0x420
> Oct 15 16:24:38 larrylap kernel:  [<c012c269>] kthread+0xe9/0xf0
> Oct 15 16:24:38 larrylap kernel:  [<c0101005>] 
> kernel_thread_helper+0x5/0x10
> Oct 15 16:24:38 larrylap kernel: DWARF2 unwinder stuck at 
> kernel_thread_helper+0x5/0x10
> Oct 15 16:24:38 larrylap kernel: Leftover inexact backtrace:
> Oct 15 16:24:38 larrylap kernel:  [<c0104f4b>] show_trace+0x1b/0x20
> Oct 15 16:24:38 larrylap kernel:  [<c0104f76>] dump_stack+0x26/0x30
> Oct 15 16:24:38 larrylap kernel:  [<c0131099>] 
> print_infinite_recursion_bug+0x49/0x50
> Oct 15 16:24:38 larrylap kernel:  [<c01311d5>] 
> find_usage_backwards+0x65/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131210>] 
> find_usage_backwards+0xa0/0xd0
> Oct 15 16:24:38 larrylap kernel:  [<c0131e27>] check_usage+0x27/0x280
> Oct 15 16:24:38 larrylap kernel:  [<c01337a0>] __lock_acquire+0xac0/0xdc0
> Oct 15 16:24:38 larrylap kernel:  [<c0133e18>] lock_acquire+0x68/0x90
> Oct 15 16:24:38 larrylap kernel:  [<c0310788>] 
> _spin_lock_irqsave+0x48/0x60
> Oct 15 16:24:38 larrylap kernel:  [<c0112713>] 
> change_page_attr+0x13/0x260
> Oct 15 16:24:38 larrylap kernel:  [<c0112996>] kernel_map_pages+0x36/0xa0
> Oct 15 16:24:38 larrylap kernel:  [<c0146c68>] 
> free_hot_cold_page+0x98/0x130
> Oct 15 16:24:38 larrylap kernel:  [<c0146d5a>] free_hot_page+0xa/0x10
> Oct 15 16:24:38 larrylap kernel:  [<c0146d8a>] __free_pages+0x2a/0x40
> Oct 15 16:24:38 larrylap kernel:  [<c0146dce>] free_pages+0x2e/0x40
> Oct 15 16:24:38 larrylap kernel:  [<c015ac39>] kmem_freepages+0x79/0xa0
> Oct 15 16:24:38 larrylap kernel:  [<c015c242>] slab_destroy+0x112/0x1a0
> Oct 15 16:24:38 larrylap kernel:  [<c015c424>] free_block+0x154/0x1a0
> Oct 15 16:24:38 larrylap kernel:  [<c015c5b2>] 
> cache_flusharray+0x72/0x150
> Oct 15 16:24:38 larrylap kernel:  [<c015c106>] kmem_cache_free+0xb6/0xe0
> Oct 15 16:24:38 larrylap kernel:  [<c015c277>] slab_destroy+0x147/0x1a0
> Oct 15 16:24:38 larrylap kernel:  [<c015c424>] free_block+0x154/0x1a0
> Oct 15 16:24:38 larrylap kernel:  [<c015c5b2>] 
> cache_flusharray+0x72/0x150
> Oct 15 16:24:38 larrylap kernel:  [<c015c106>] kmem_cache_free+0xb6/0xe0
> Oct 15 16:24:38 larrylap kernel:  [<c01d59df>] 
> ext3_destroy_inode+0x1f/0x30
> Oct 15 16:24:38 larrylap kernel:  [<c017a02b>] destroy_inode+0x2b/0x60
> Oct 15 16:24:38 larrylap kernel:  [<c017aae1>] dispose_list+0x81/0x100
> Oct 15 16:24:38 larrylap kernel:  [<c017ad50>] 
> shrink_icache_memory+0x1f0/0x230
> Oct 15 16:24:38 larrylap kernel:  [<c0149c72>] shrink_slab+0x122/0x190
> Oct 15 16:24:38 larrylap kernel:  [<c014ad87>] kswapd+0x297/0x420
> Oct 15 16:24:38 larrylap kernel:  [<c012c269>] kthread+0xe9/0xf0
> Oct 15 16:24:38 larrylap kernel:  [<c0101005>] 
> kernel_thread_helper+0x5/0x10
>
>
> Larry
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