Opened 3 weeks ago

Closed 8 days ago

#2409 closed defect (fixed)

Nginx would not be edge-triggered to read new stream frame correctly in some case

Reported by: himac.lee@… Owned by:
Priority: major Milestone:
Component: http/3 Version: 1.23.x
Keywords: edge-triggered offset recv_offset Cc: himac.lee@…
uname -a: Linux pekphis107316 4.15.0-156-generic #163-Ubuntu SMP Thu Aug 19 23:31:58 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
nginx -V: nginx version: nginx/1.23.0
built by gcc 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)
built with OpenSSL 1.1.1 (compatible; BoringSSL) (running with BoringSSL)
TLS SNI support enabled
configure arguments: --prefix=/usr/local/nginx_http3/nginx --with-debug --with-ld-opt='-Wl,-rpath, -L/work/unitrans90/boringssl/src/build/ssl/ -L//work/boringssl/src/build/crypto' --with-cc-opt='-I//work//boringssl/src/include/ ' --with-stream --with-stream_quic_module --with-http_v2_module --with-http_v3_module --with-http_stub_status_module --with-stream --with-stream_ssl_module --with-stream_ssl_preread_module --with-http_ssl_module

Description

source code version: nginx-quic-8d0753760546

While use a client send http3 POST request to nginx proxy server, in ngx_quic_handle_stream_frame function, when f->offset == qs->recv_offset, new frame offset equals to data offset read by application, nginx will edge-triggered to read new data by ngx_quic_set_event function.

Assuming that:
If a Quic client sent [0, 1305), [1350, 2610), [2610,3050) data packets to nginx, nginx will send ACK frame to Client. nginx received all data packets, but the packet containing ACK indicates [2610,3050) lost.

The client may retransmit data from offset 2610 and send new data in the same stream frame which is [2610, 3915), the frame left boundary for future transmission may be (f->offset=2610 , 3915 or larger) no longer equals qs->recv_offset(3050) , read event will not edge-triggered again.

Attachments (1)

quic-egde (1.1 KB ) - added by Roman Arutyunyan 8 days ago.

Download all attachments as: .zip

Change History (4)

comment:1 by Roman Arutyunyan, 8 days ago

Thanks for noticing this. Are you to reproduce the issue? If, yes please try the attached patch.

by Roman Arutyunyan, 8 days ago

Attachment: quic-egde added

comment:3 by Roman Arutyunyan, 8 days ago

Resolution: fixed
Status: newclosed
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