Re: BUG in 2.6.18.1?

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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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