Mercurial > hg > nginx
annotate misc/README @ 7951:c7a8bdf5af55
Changed ngx_chain_update_chains() to test tag first (ticket #2248).
Without this change, aio used with HTTP/2 can result in connection hang,
as observed with "aio threads; aio_write on;" and proxying (ticket #2248).
The problem is that HTTP/2 updates buffers outside of the output filters
(notably, marks them as sent), and then posts a write event to call
output filters. If a filter does not call the next one for some reason
(for example, because of an AIO operation in progress), this might
result in a state when the owner of a buffer already called
ngx_chain_update_chains() and can reuse the buffer, while the same buffer
is still sitting in the busy chain of some other filter.
In the particular case a buffer was sitting in output chain's ctx->busy,
and was reused by event pipe. Output chain's ctx->busy was permanently
blocked by it, and this resulted in connection hang.
Fix is to change ngx_chain_update_chains() to skip buffers from other
modules unconditionally, without trying to wait for these buffers to
become empty.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Sat, 30 Oct 2021 02:39:19 +0300 |
parents | 001beb963d86 |
children | 985b0bda403c |
rev | line source |
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681 | 1 |
2 make -f misc/GNUmakefile release | |
3 | |
4 the required tools: | |
5 *) xsltproc to build CHANGES, | |
5663
001beb963d86
Documented the switch from java XSLScript to xslscript.pl.
Ruslan Ermilov <ru@nginx.com>
parents:
5212
diff
changeset
|
6 *) xslscript.pl ( http://hg.nginx.org/xslscript ) to build XSLTs |
681 | 7 from XSLScript sources. |
8 | |
9 | |
10 make -f misc/GNUmakefile icons | |
11 | |
12 the required tool: | |
13 *) netpbm to create Win32 icons from xpm sources. |