Re: Bug#1093243: Upgrade to 6.1.123 kernel causes mariadb hangs

[Salvatore Bonaccorso <carnil@debian.org>]

Hi Xan,

On Thu, Jan 23, 2025 at 02:31:34PM -0600, Xan Charbonnet wrote:
> I rented a Linode and have been trying to load it down with sysbench
> activity while doing a mariabackup and a mysqldump, also while spinning up
> the CPU with zstd benchmarks.  So far I've had no luck triggering the fault.
> 
> I've also been doing some kernel compilation.  I followed this guide:
> https://www.dwarmstrong.org/kernel/
> (except that I used make -j24 to build in parallel and used make
> localmodconfig to compile only the modules I need)
> 
> I've built the following kernels:
> 6.1.123 (equivalent to linux-image-6.1.0-29-amd64)
> 6.1.122
> 6.1.121
> 6.1.120
> 
> So far they have all exhibited the behavior.  Next up is 6.1.119 which is
> equivalent to linux-image-6.1.0-28-amd64.  My expectation is that the fault
> will not appear for this kernel.
> 
> It looks like the issue is here somewhere:
> https://www.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.120
> 
> I have to work on some other things, and it'll take a while to prove the
> negative (that is, to know that the failure isn't happening).  I'll post
> back with the 6.1.119 results when I have them.

Additionally please try with 6.1.120 and revert this commit 

3ab9326f93ec ("io_uring: wake up optimisations")

(which landed in 6.1.120).

If that solves the problem maybe we miss some prequisites in the 6.1.y
series here?

Regards,
Salvatore