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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>
date Sat, 30 Oct 2021 02:39:19 +0300
parents e393c0bf53d3
children
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


have=NGX_SOLARIS . auto/have_headers

CORE_INCS="$UNIX_INCS"
CORE_DEPS="$UNIX_DEPS $SOLARIS_DEPS"
CORE_SRCS="$UNIX_SRCS $SOLARIS_SRCS "
CORE_LIBS="$CORE_LIBS -lsocket -lnsl"

NGX_RPATH=YES

# Solaris's make does not support a blank line between target and rules
ngx_spacer=

CC_AUX_FLAGS="$CC_AUX_FLAGS -D_FILE_OFFSET_BITS=64 -lsocket -lnsl"


if [ $ZLIB_ASM != NO ]; then
    echo "$0: error: the --with-zlib-asm=CPU option is not supported"
    echo "on that platform"
    echo

    exit 1
fi


ngx_feature="sendfilev()"
ngx_feature_name="NGX_HAVE_SENDFILE"
ngx_feature_run=no
ngx_feature_incs="#include <sys/sendfile.h>"
ngx_feature_path=
ngx_feature_libs="-lsendfile"
ngx_feature_test="int fd = 1; sendfilevec_t vec[1];
                  size_t sent; ssize_t n;
                  n = sendfilev(fd, vec, 1, &sent);
                  if (n == -1) return 1"
. auto/feature


if [ $ngx_found = yes ]; then
    CORE_SRCS="$CORE_SRCS $SOLARIS_SENDFILEV_SRCS"
    CORE_LIBS="$CORE_LIBS -lsendfile"
fi


ngx_feature="event ports"
ngx_feature_name="NGX_HAVE_EVENTPORT"
ngx_feature_run=no
ngx_feature_incs="#include <port.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="(void) port_create()"
. auto/feature

if [ $ngx_found = yes ]; then
    CORE_SRCS="$CORE_SRCS $EVENTPORT_SRCS"
    EVENT_MODULES="$EVENT_MODULES $EVENTPORT_MODULE"
fi