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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** Tags added: cscc
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https://bugs.launchpad.net/bugs/1788623
Title:
regression: IPv6 PMTU discovery fails with source-specific routing
Status in linux package in Ubuntu:
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Confirmed
** Changed in: linux (Ubuntu)
Status: In Progress => Confirmed
** Changed in: linux (Ubuntu Bionic)
Assignee: Joseph Salisbury (jsalisbury) => (unassigned)
** Changed in: linux (Ubuntu)
Assignee:
You mention in comment #2 that your patch resolves this bug. Is that
still the case, and have you sent it upstream for inclusion in mainline?
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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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I started a kernel bisect between commit v4.14 final and v4.15-rc1. The
kernel bisect will require testing of about 13 test kernels.
I built the first test kernel, up to the following commit:
1be2172e96e33bfa22a5c7a651f768ef30ce3984
The test kernel can be downloaded from:
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
Thanks for testing. There are quite a few ipv6 commits added in
v4.15-rc1, so we may have to bisect through them. Can you first confirm
that v4.15-rc1 exhibits the bug? It can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc1/
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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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Thanks for testing. That implies that commit 35732d01fe31 is not the
specific commit that introduced the regression. I built a second test
kernel up to the commit f5bbe7ee79c2.
This test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1788623
Can you test this kernel and
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
To confirm this regression is due to commit 35732d01fe31, I built a
mainline test kernel with that commits as the tip.
This test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1788623
Can you test this kernel and see if it resolves this bug?
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I ran the test case on the 4.19.0-041900rc1-generic kernel and it also
has the bug.
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https://bugs.launchpad.net/bugs/1788623
Title:
regression: IPv6 PMTU discovery fails
The following commit introduced the exception table in v4.15-rc1:
35732d01fe31 ipv6: introduce a hash table to store dst cache
This commit does not revert easily. Before I contact upstream
regarding this regression, can you test the v4.19-rc1 kernel to see if
any other commits may have helped
** Changed in: linux (Ubuntu)
Status: Incomplete => In Progress
** Changed in: linux (Ubuntu Bionic)
Status: Incomplete => In Progress
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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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I'd like to perform a bisect to figure out what commit caused this
regression. We need to identify the earliest kernel where the issue
started happening as well as the last kernel that did not have this
issue.
Can you test the following kernels and report back? We are looking for
the first kernel
** Changed in: linux (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1788623
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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https://bugs.launchpad.net/bugs/1788623
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
** Tags added: patch
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https://bugs.launchpad.net/bugs/1788623
Title:
regression: IPv6 PMTU discovery fails with source-specific routing
Status in linux package in Ubuntu:
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
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