** Tags removed: bugnameltc-192677 severity-high
** Tags added: bugnameltc-194783 severity-medium
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https://bugs.launchpad.net/bugs/1927076
Title:
IPv6 TCP in reuseport_bpf_cpu from
** Also affects: linux (Ubuntu Impish)
Importance: Undecided
Status: New
** Tags added: 5.13 impish
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https://bugs.launchpad.net/bugs/1927076
Title:
IPv6 TCP in
Marking as "incomplete" while waiting for input from Power MMU experts.
** Changed in: ubuntu-power-systems
Status: Confirmed => Incomplete
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The Hirsute Hippo has reached End of Life, so this bug will not be fixed
for that release.
** Changed in: linux (Ubuntu Hirsute)
Status: Confirmed => Won't Fix
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I've made some good progress here.
I found that older version like 4.19 work, so I ran git bisect. I'm
still doing the final check, but it looks like the series that causes
the issue is the one containing these:
d53d2f78cead bpf: Use vmalloc special flag
1a7b7d922081 modules: Use vmalloc special
I can repro on upstream, all the way back to 5.4.0. It might have
existed before that - I haven't tested any earlier yet.
Was the test methodology changed just before this was found? I'm just
wondering why it suddenly appeared ~a year after Focal was released. I
thought it might have been a patch
I can repro this with the latest Focal kernel on:
description: PowerNV
product: 8247-22L (IBM Power System S822L)
Trying to see if I can repro it upstream.
FWIW my opening hypothesis is that something in a percpu data structure
isn't getting updated over hotplug.
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** Tags removed: bugnameltc-194783 severity-medium
** Tags added: bugnameltc-192677 severity-high
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https://bugs.launchpad.net/bugs/1927076
Title:
IPv6 TCP in reuseport_bpf_cpu from
** Summary changed:
- IPv6 TCP in reuseport_bpf_cpu from ubuntu_kernel_selftests/net crash P8 node
entei on 5.8 kernel (Oops: Exception in kernel mode, sig: 4 [#1])
+ IPv6 TCP in reuseport_bpf_cpu from ubuntu_kernel_selftests/net crash P8 node
entei (Oops: Exception in kernel mode, sig: 4 [#1])
