Ubuntu
linux package

  1. Bug #1927076
  2. Comment #26

Comment 26 for bug 1927076

Revision history for this message
Thadeu Lima de Souza Cascardo (cascardo) wrote (last edit ): Re: 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])

I tested that when reuseport_bpf_cpu did not consider the last CPU, the one that has been hotplugged, it didn't crash. It didn't set affinity to that CPU, didn't even allocate socket for it.

Then, I realized that attaching the BPF code was happening on that CPU as it happened right after the tests were run, and the last test set the CPU affinity to that CPU. So, I set the affinity to CPU 0 right before attaching the BPF code. So far, the system did not crash either.

Cascardo.

Scratch that. It looks like the system was not reproducing until I rebooted and tested it again. The last test didn't work out. That is, even setting affinity to a different CPU before attaching BPF resulted in a crash.