Hello netfilter folks, Since v6.16-rc7 I've been hitting a vexing system hang (no kernel panic is being produced that I can see). I did not have this problem when running rc6. I first noticed it the morning after upgrading to rc7. I found the machine unresponsive. Checking logs after restarting it, I could see it had been in the middle of being backed up by an rsync-based backup system. This same sequence repeated the following day. Then I also started experiencing the hang when running a build on a proprietary codebase that I work on. The machine that is hanging is a virtual machine host, with a fleet of VMs that I use for doing various development tasks. One of those VMs is where I build the proprietary system. I do that by SSHing to the VM from the host and invoking the build from there. The strange thing is that at the point the hang occurs, there's nothing overtly "networky" that the build system is doing. It's just compressing and creating a self-extracting archive on the build VM. But it happens with 100% consistency which allowed me to bisect it down to commit 2d72afb34065 (netfilter: nf_conntrack: fix crash due to removal of uninitialised entry). The hang is still present on the final v6.16 just released yesterday. I have confirmed that if I revert the above commit on top of v6.16, I can no longer reproduce the problem. I know this doesn't provide a lot detail about the cause of the problem, but the nature of the hang prevents me from being able to check logs since the whole system becomes unresponsive. Any ideas on next steps I might be able to take to gather more information, if needed, are welcome. Cheers, -- Dan #regzbot introduced: 2d72afb34065
