This bug was fixed by upstream in v5.2 (commit
510e2ceda031eed97a7a0f9aad65d271a58b460d). It's also fixed in v5.0.19,
i.e. the fix is available in Disco-updates/security since version
5.0.0-26.27 of the linux package, and in Eoan and Focal.
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** Patch removed: "net/ipv6/route: Fix PMTU for source-specific routes"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1788623/+attachment/5179773/+files/0001-net-ipv6-route-Fix-PMTU-for-source-specific-routes.patch
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Sorry for the long delay. I have tested the following version now, and
the test (pmtu-sadr.sh) reports failure.
Linux ubuntu 4.14.0-041400-generic #201809131957 SMP Thu Sep 13 20:03:05
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
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Yes, 4.15.0-041500rc1-generic exhibits the bug.
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https://bugs.launchpad.net/bugs/1788623
Title:
regression: IPv6 PMTU discovery fails with source-specific routing
Status
Yes, the following kernels also resolves this bug:
Linux ubuntu 4.14.0-041400rc3-generic #201808301751 SMP Thu Aug 30 17:53:30 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux
Linux ubuntu 4.14.0-041400rc3-generic #201808301846 SMP Thu Aug 30 18:47:56 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux
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Yes, kernel 4.14.0-041400rc3-generic resolves the bug. The test case in
#1 succeeds with that kernel.
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https://bugs.launchpad.net/bugs/1788623
Title:
regression: IPv6 PMTU
I ran the test case on the 4.19.0-041900rc1-generic kernel and it also
has the bug.
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Title:
regression: IPv6 PMTU discovery fails
I have tested all kernels in the list (except 4.6 which link leads to
404) and the first kernel with the bug is v4.15 Final.
Kernel v4.15 also seems to be the first kernel with the exception table
in net/ipv6/route.c.
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** Changed in: linux (Ubuntu)
Status: Incomplete => New
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Title:
regression: IPv6 PMTU discovery fails with source-specific
I added logs from a Virtual Machine I did some testing on. But I doubt
they are very interesting.
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Title:
regression: IPv6 PMTU
apport information
** Tags added: apport-collected
** Description changed:
IPv6 PMTU discovery fails when using source-specific routing on Ubuntu
18.04.
I have attached a test case called pmtu-sads.sh which is based on
tools/testing/selftests/net/pmtu.sh in the linux source.
I
apport information
** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/bugs/1788623/+attachment/5179833/+files/ProcModules.txt
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apport information
** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/bugs/1788623/+attachment/5179828/+files/Lspci.txt
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apport information
** Attachment added: "CurrentDmesg.txt"
https://bugs.launchpad.net/bugs/1788623/+attachment/5179827/+files/CurrentDmesg.txt
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apport information
** Attachment added: "ProcEnviron.txt"
https://bugs.launchpad.net/bugs/1788623/+attachment/5179831/+files/ProcEnviron.txt
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apport information
** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/bugs/1788623/+attachment/5179835/+files/WifiSyslog.txt
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apport information
** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/1788623/+attachment/5179834/+files/UdevDb.txt
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apport information
** Attachment added: "ProcCpuinfoMinimal.txt"
https://bugs.launchpad.net/bugs/1788623/+attachment/5179830/+files/ProcCpuinfoMinimal.txt
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apport information
** Attachment added: "Card0.Codecs.codec.0.txt"
https://bugs.launchpad.net/bugs/1788623/+attachment/5179826/+files/Card0.Codecs.codec.0.txt
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apport information
** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/1788623/+attachment/5179832/+files/ProcInterrupts.txt
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apport information
** Attachment added: "PciMultimedia.txt"
https://bugs.launchpad.net/bugs/1788623/+attachment/5179829/+files/PciMultimedia.txt
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apport information
** Attachment added: "CRDA.txt"
https://bugs.launchpad.net/bugs/1788623/+attachment/5179825/+files/CRDA.txt
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Patch which fixes the bug for me.
** Patch added: "net/ipv6/route: Fix PMTU for source-specific routes"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1788623/+attachment/5179773/+files/0001-net-ipv6-route-Fix-PMTU-for-source-specific-routes.patch
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** Description changed:
IPv6 PMTU discovery fails when using source-specific routing on Ubuntu
18.04.
I have attached a test case called pmtu-sads.sh which is based on
tools/testing/selftests/net/pmtu.sh in the linux source.
- I have verified that the test succeeds on:
- Ubuntu
Public bug reported:
IPv6 PMTU discovery fails when using source-specific routing on Ubuntu
18.04.
I have attached a test case called pmtu-sads.sh which is based on
tools/testing/selftests/net/pmtu.sh in the linux source.
I have verified that the test fails on:
Ubuntu 18.04 with 4.15.0-30.32
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