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FEC: Emergency resize: Fixed crash-bug. Fixed minimum history condition. #2717

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merged 2 commits into from
Apr 19, 2023

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@ethouris ethouris commented Apr 17, 2023

Fixes #2707

Repro information: configure transmission with having packetfilter=fec,cols:100,rows:50,arq:always,layout:staircase in the SRT URI on one of the transmission sides (the other will follow).

@maxsharabayko maxsharabayko added Type: Bug Indicates an unexpected problem or unintended behavior [core] Area: Changes in SRT library core labels Apr 19, 2023
@maxsharabayko maxsharabayko added this to the v1.5.2 milestone Apr 19, 2023
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bpolic commented Apr 19, 2023

Tested on 1.5.2 RC1 version, can confirm that crash is there:

./srt-xtransmit generate "srt://:4888?packetfilter=fec" --enable-metrics --sendrate 2Mbps --duration 60s -v 
./srt-xtransmit receive "srt://192.168.3.1:4888?packetfilter=fec,cols:100,rows:50,arq:always,layout:staircase" --enable-metrics -v

After 17 second crash happened:

 7ffee6aa2000-7ffee6ac3000 rw-p 00000000 00:00 0                          [stack]
7ffee6bfa000-7ffee6bfc000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
Aborted (core dumped)
[haivision@big-flop bin]$

Tested with fix, commit number: git rev-parse HEAD
142d944

16:12:09.273080/SRT:RcvQ:w1!W:SRT.pf: FEC: LARGE DROP detected! Resetting all groups. Base: %1147706772 -> %1147701772(shift by -5000)
16:12:09.278358/SRT:RcvQ:w1!W:SRT.pf: FEC: LARGE DROP detected! Resetting all groups. Base: %1147706772 -> %1147701772(shift by -5000)
16:12:09.283075 [D] SOCKET::SRT 0x17F648E9 read::recv ERROR 2001 Connection was broken
16:12:09.283145 [W] RECEIVE read::recv: Connection was broken
16:12:09.283390 [D] SOCKET::SRT 0x17F648E9 Releasing epolls before closing
16:12:09.283435 [D] SOCKET::SRT 0x17F648E9 Closing
[haivision@big-flop bin]$ git rev-parse HEAD
979b55620594d595b80be3058ad74aa4a32f3e58

@maxsharabayko maxsharabayko merged commit 59cde53 into Haivision:master Apr 19, 2023
guilletrejo added a commit to swxtchio/srt that referenced this pull request Aug 23, 2023
* [core] Fix crypto mode auto for listener sender (Haivision#2711).


Co-authored-by: oviano <ovcollyer@mac.com>

* [build] Upgraded CI: ubuntu to version 20.04 (Haivision#2682).

* [docs] Added the link for registration in slack to the getting started table (Haivision#2721).

* [core] Fixed FEC Emergency resize crash (Haivision#2717).

Fixed minimum history condition.

* [core] Fixed various compiler warnings on various platforms (Haivision#2679).

* [core] Minor fix of variable shadowing.

* [tests] Minor fix of variable shadowing.

* [build] Add -Wshadow=local to CMake build flags.
Supported since GCC 7.0.

* [core] Correct remaining endianness issues

Fixes the last two remaining test failures on big-endian.  These
operations were all already no-ops on little-endian, and unnecessarily
byteswapped the IP addresses on big-endian.

Closes: Haivision#2697

* [docs] Minor updates to AEAD docs plus changed v1.6.0 to 1.5.2 in some files

* [build] Fix downversioning of _WIN32_WINNT (Haivision#2754).

* [core] Fixed unhandled error in haicrypt (Haivision#2685).

* [core] Use overlapped WSASendTo to avoid loss in UDP sending (Haivision#2632).

* [core] Add volatile keyword to asm block in rdtsc (Haivision#2759).

* [core] Fixed srctime from closing socket was mistakenly cleared

* [core] Fixed group read-ready epoll events.

* [core] Removed unused CUDTGroup::m_Positions.

* [core] Perf improvement of group reading.

* [core] Fixed RCV buffer initialization in Rendezvous.

* [docs] Updating the explicit information for binding to IPv6 wildcard (Haivision#2765).

* [tests] Added custom main with transparent parameters for tests (Haivision#2681).

* [core] Fix memory leak when can't buffer a HS packet (Haivision#2757).

* [core] Refactor CRcvQueue::storePkt(..) for better resource management (Haivision#2775).

* [core] Fix hang up on not enough space in the RCV buffer (Haivision#2745).

When there is space available in the receiving buffer after it is full,
send an ack to allow the sender to resume transmission.
Reschedule sending if ACK decreases the flight span after sending is congested.

Co-authored-by: Maxim Sharabayko <maxlovic@gmail.com>

* [core] fix tsbpd() may deadlock with processCtrlShutdown()

* [core] Slightly optimize the RCV drop by message number (Haivision#2686).

Some minor improvements of logs and comments.

* [core] Rejection not undertaken in rendezvous after KMX failure (Haivision#2692).

* [core] Fix: In rendezvous when processing resulted in ACCEPT it was still sending rejection

* [core] Minor code clean up in CRateEstimator.

* [core] Initialize ISN and PeerISN in CUDT.

* [core] Drop unencrypted packets in GCM mode.

* [apps] Fix the build for target without IP_ADD_SOURCE_MEMBERSHIP (Haivision#2779).

* [core] Added maximum BW limit for retransmissions (Haivision#2714).

* [API] SRT version raised to 1.5.3.

* [apps] Fixed conditional IP_ADD_SOURCE_MEMBERSHIP in testmedia (Haivision#2780).

* [core] Fixed SRT_ATTR_REQUIRES use.

* [build] Added missing public header files in Windows binary installer (Haivision#2784).

The header file access_control.h was added to the source tree
at some point but was not added to the Windows installer.

---------

Co-authored-by: Maxim Sharabayko <maxlovic@gmail.com>
Co-authored-by: oviano <ovcollyer@mac.com>
Co-authored-by: Sektor van Skijlen <ethouris@gmail.com>
Co-authored-by: Maria Sharabayko <41019697+mbakholdina@users.noreply.github.com>
Co-authored-by: Maxim Sharabayko <maxsharabayko@haivision.com>
Co-authored-by: matoro <matoro@users.noreply.github.com>
Co-authored-by: Maria Sharabayko <msharabayko@haivision.com>
Co-authored-by: Steve Lhomme <robux4@ycbcr.xyz>
Co-authored-by: Aaron Jencks <32805004+aaron-jencks@users.noreply.github.com>
Co-authored-by: Guangqing Chen <hi@goushi.me>
Co-authored-by: john <hondaxiao@tencent.com>
Co-authored-by: yomnes0 <127947185+yomnes0@users.noreply.github.com>
Co-authored-by: Mikołaj Małecki <mmalecki@haivision.com>
Co-authored-by: Jose Santiago <jsantiago@haivision.com>
Co-authored-by: Thierry Lelegard <lelegard@users.noreply.github.com>
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coredump happens when I use FEC
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