Hi,
We just found a worker process was stuck in an infinite loop, in function
ngx_open_file_lookup(). Checking the open file cache RB tree with GDB shows
the following:
(gdb) p cache->rbtree.root->right
$3 = (ngx_rbtree_node_t *) 0x80122f900
(gdb) p cache->rbtree.root->right->right
$4 = (ngx_rbtree_node_t *) 0x8040ea400
(gdb) p cache->rbtree.root->right->right->left
$5 = (ngx_rbtree_node_t *) 0x801236980
(gdb) p cache->rbtree.root->right->right->left->right
$6 = (ngx_rbtree_node_t *) 0x8090ee080
(gdb) p cache->rbtree.root->right->right->left->right->right
$7 = (ngx_rbtree_node_t *) 0x804aab280
(gdb) p cache->rbtree.root->right->right->left->right->right->left
$8 = (ngx_rbtree_node_t *) 0x804aabf00
(gdb) p cache->rbtree.root->right->right->left->right->right->left->left
$9 = (ngx_rbtree_node_t *) 0x8090ee080
(gdb) p
cache->rbtree.root->right->right->left->right->right->left->left->right
$10 = (ngx_rbtree_node_t *) 0x804aab280
(gdb) p
cache->rbtree.root->right->right->left->right->right->left->left->right->lef
t
$11 = (ngx_rbtree_node_t *) 0x804aabf00
(gdb) p
cache->rbtree.root->right->right->left->right->right->left->left->right->lef
t->left
$12 = (ngx_rbtree_node_t *) 0x8090ee080
(gdb) p
cache->rbtree.root->right->right->left->right->right->left->left->right->lef
t->left->right
$13 = (ngx_rbtree_node_t *) 0x804aab280
(gdb) p
cache->rbtree.root->right->right->left->right->right->left->left->right->lef
t->left->right->left
$14 = (ngx_rbtree_node_t *) 0x804aabf00
Please look at the address of
cache->rbtree.root->right->right->left->right->right->left->left ($9)
It is the same as that of
cache->rbtree.root->right->right->left->right ($6)
That means the $9 == $9->parent->parent->parent, so the infinite loop.
I think there might be a bug in ngx_rbtree.c. I'll really appreciate it if
somebody can look into it.
Thanks a lot,
Yongfeng Wu
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