Hello list,
We are porting ModSecurity to NGINX. However we are seeing sometimes an
issue. Nginx eats 100% of cpu and when i use gdb i see:
gdb -p 8645
ngx_event_pipe_write_to_downstream (p=0x9bbc720, do_write=0) at
src/event/ngx_event_pipe.c:551
551 if (cl->buf->recycled) {
(gdb)
Looks like it is happening when we call ngx_http_modsecurity_body_filter()
then go to this conditions;
rc = move_chain_to_brigade(in, ctx->brigade, r->pool, 0);
if (rc != NGX_OK) {
r->buffered |= NGX_HTTP_SSI_BUFFERED;
return rc;
}
move_chainto_brigade is defined as:
ngx_int_t
move_chain_to_brigade(ngx_chain_t *chain, apr_bucket_brigade *bb,
ngx_pool_t *pool, ngx_int_t last_buf) {
apr_bucket *e;
ngx_chain_t *cl;
while (chain) {
e = ngx_buf_to_apr_bucket(chain->buf, bb->p, bb->bucket_alloc);
if (e == NULL) {
return NGX_ERROR;
}
APR_BRIGADE_INSERT_TAIL(bb, e);
if (chain->buf->last_buf) {
e = apr_bucket_eos_create(bb->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(bb, e);
chain->buf->last_buf = 0;
return NGX_OK;
}
cl = chain;
chain = chain->next;
ngx_free_chain(pool, cl);
}
if (last_buf) {
e = apr_bucket_eos_create(bb->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(bb, e);
return NGX_OK;
}
return NGX_AGAIN;
}
Let me know if you guys can help us understanding why sometimes we trigger
this issue
Thanks
Breno
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