[ adding Paolo, author of 18f25dc39990 ] On 7/1/21 4:47 AM, Matthias Treydte wrote: > Hello, > > we recently upgraded the Linux kernel from 5.11.21 to 5.12.12 in our > video stream receiver appliance and noticed compression artifacts on > video streams that were previously looking fine. We are receiving UDP > multicast MPEG TS streams through an FFMpeg / libav layer which does the > socket and lower level protocol handling. For affected kernels it spills > the log with messages like > >> [mpegts @ 0x7fa130000900] Packet corrupt (stream = 0, dts = 6870802195). >> [mpegts @ 0x7fa11c000900] Packet corrupt (stream = 0, dts = 6870821068). > > Bisecting identified commit 18f25dc399901426dff61e676ba603ff52c666f7 as > the one introducing the problem in the mainline kernel. It was > backported to the 5.12 series in > 450687386cd16d081b58cd7a342acff370a96078. Some random observations which > may help to understand what's going on: > > * the problem exists in Linux 5.13 > * reverting that commit on top of 5.13 makes the problem go away > * Linux 5.10.45 is fine > * no relevant output in dmesg > * can be reproduced on different hardware (Intel, AMD, different > NICs, ...) > * we do use the bonding driver on the systems (but I did not yet > verify that this is related) > * we do not use vxlan (mentioned in the commit message) > * the relevant code in FFMpeg identifying packet corruption is here: > > https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/mpegts.c#L2758 > > And the bonding configuration: > > # cat /proc/net/bonding/bond0 > Ethernet Channel Bonding Driver: v5.10.45 > > Bonding Mode: fault-tolerance (active-backup) > Primary Slave: None > Currently Active Slave: enp2s0 > MII Status: up > MII Polling Interval (ms): 100 > Up Delay (ms): 0 > Down Delay (ms): 0 > Peer Notification Delay (ms): 0 > > Slave Interface: enp2s0 > MII Status: up > Speed: 1000 Mbps > Duplex: full > Link Failure Count: 0 > Permanent HW addr: 80:ee:73:XX:XX:XX > Slave queue ID: 0 > > Slave Interface: enp3s0 > MII Status: down > Speed: Unknown > Duplex: Unknown > Link Failure Count: 0 > Permanent HW addr: 80:ee:73:XX:XX:XX > Slave queue ID: 0 > > > If there is anything else I can do to help tracking this down please let > me know. > > > Regards, > -Matthias Treydte > >
