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OpenedIDCategoryTask TypePrioritySeveritySummaryReported InStatus
10.08.20181762Base systemBug ReportVery LowMedium18.06.1 openvpn (mbedtls and openssl) write to TUN/TAP ...openwrt-18.06Unconfirmed Task Description

I have tested this with a tl-wr842n-v3 (ar71xx/generic) and MikroTik rb750gr3 (ramips/mt7621). The problem seems to be architecture independant. This setup works fine with 17.05.1

There is already an issue filed with freifunk-berlin

With 18.06.1 I have tested with openvpn-mbedtls and openvpn-openssl. With 17.01.5 I tested with openvpn-mbedtls. Attached are pcapng files for both the wan interface (host filtered) and the ffuplink (vpn) interface. On the ffuplink interface I simply ran a “ping <IPADDR> -I ffuplink”.

Attached is also an example log from 18.06.1 and the configuration for openvpn on the router.

Also worth noting is that there are crc errors being reported which I run tcpdump directly on the router

 ~# tcpdump  -nvvi br-wan host
tcpdump: listening on br-wan, link-type EN10MB (Ethernet), capture size 262144 bytes
22:50:56.042355 IP (tos 0x0, ttl 64, id 3801, offset 0, flags [DF], proto UDP (17), length 136) > [bad udp cksum 0xb6b8 -> 0x8450!] UDP, length 108
22:50:57.050206 IP (tos 0x0, ttl 64, id 3838, offset 0, flags [DF], proto UDP (17), length 136) > [bad udp cksum 0xb6b8 -> 0xcf66!] UDP, length 108
22:50:57.059920 IP (tos 0x0, ttl 59, id 62922, offset 0, flags [DF], proto UDP (17), length 66) > [udp sum ok] UDP, length 38
22:50:58.058255 IP (tos 0x0, ttl 64, id 3859, offset 0, flags [DF], proto UDP (17), length 136) > [bad udp cksum 0xb6b8 -> 0x0c0a!] UDP, length 108
22:50:59.066179 IP (tos 0x0, ttl 64, id 3941, offset 0, flags [DF], proto UDP (17), length 136) > [bad udp cksum 0xb6b8 -> 0x3675!] UDP, length 108
22:51:00.074120 IP (tos 0x0, ttl 64, id 3973, offset 0, flags [DF], proto UDP (17), length 136) > [bad udp cksum 0xb6b8 -> 0x8ba0!] UDP, length 108
22:51:01.082085 IP (tos 0x0, ttl 64, id 4039, offset 0, flags [DF], proto UDP (17), length 136) > [bad udp cksum 0xb6b8 -> 0x0392!] UDP, length 108

I unfortunately can not be of much help with debugging this issue before the beginning of Sept (traveling). If anyone wants to test with the same server, you can apply for a freifunk-berlin tunnel cert at (hopefully the cert will get approved quickly). To get the extra data files in the /etc/openvpn diretory, please temporarily install berlin-freifunk’s Hedy-1.0.1 firmware (tunnel-berlin version).

I unfortunately don’t have acces to the vpn server ( so I cannot post the server config. A similar config from a peer server is attached.

06.03.20181414ToolchainBuild FailureVery LowVery Lowmbedtls: building with ccache: /staging_dir/host/bin/cc...TrunkUnconfirmed Task Description

I am currently trying to compile OpenWRT for


I am using


I am building in the following way:

The build was carried out on a git clone git://, later brought up to date with a git pull, with latest commit from 2018-03-05T10:44:20+01:00, commit hash 5cbd22bb0f.

Into this git clone a previously generated .config seed, made previously by make menuconfig and ./scripts/, was copied over to ./.config.

From there on, the following commands were issued:

./scripts/feeds update -a
./scripts/feeds install -a
make -j1 V=s defconfig
make -j1 V=s download
make -j1 V=s IGNORE_ERRORS=m | tee make.log

When it comed to building mbedtls, there are the following lines of output which indicate something is wrong:

make[3]: [Makefile:75: /home/felics/download/router/OS/OpenWRT/source_build/source/batch_builds/2018-02-26_12-04-45_-_custom-wo-pie_feeds-rooter-custom/build_dir/target-mips_24kc_musl/mbedtls-2.7.0/.configured_68b329da9893e34099c7d8ad5cb9c940] Error 123 (ignored)
/home/felics/download/router/OS/OpenWRT/source_build/source/batch_builds/2018-02-26_12-04-45_-_custom-wo-pie_feeds-rooter-custom/staging_dir/host/bin/ccache: invalid option -- 'd'
    ccache [options]

Build continues, (seemingliy) successfully: Indicated by the further output of make, and issuing later a make -j1 V=s (i.e. without IGNORE_ERRORS=m), does not bring this up again.

The toolchain (./staging_dir/toolchain-*) is mips_24kc_gcc-5.5.0_musl.

Build is carried out on an x86_64 Arch Linux machine.

Attached are the following files:

  • .config-diffconfig-seed: The .config-seed used for make defconfig,
  • .config: The .config created by the make defconfig and used for the build,
  • mbedtls.log: The pa[.config-diffconfig-seed.txt]( of the output of make -j1 V=s IGNORE_ERRORS=m regarding building mbedtls,
  • make.log.stdout.xz: For your interest, the full output of make -j1 V=s IGNORE_ERRORS=m (.xz compressed; decompresses to about 29 MB) (Note that at the end another build error occurs, which seems not to be related to embedtls),
  • feeds.conf: The feeds.conf used.

(Note that I just forgot to capture stderr too, but the error messages seem to be present in stdout. Since a full rebuild takes a day on my machine, I won’t do that if not necessary.)

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