On Sat, May 16, 2026 at 03:45:39PM +0200, Dag-Erling Smørgrav wrote: > Konstantin Belousov <[email protected]> writes: > > Dag-Erling Smørgrav <[email protected]> writes: > > > On recent main with a debugging kernel, I am unable to build > > > anything as the system slows to a crawl while the console is > > > inundated with stack traces: [...] > > I already posted the patch below somewhere, but did not get a response. > > The patch made no difference. > > FWIW what triggers the problem is running tail -F on the build log, > which I always do when building. Tailing a file which is being written > to triggers it on every write, but even tailing an empty file triggers > it about once per second. > > So for now I'm able to build, as long as I don't tail the log... > ...
I am a bit puzzled, as from the description, I would expect to see
similar behavior, but I do not.
I am tracking head (and stable/15) daily, on a set of 5 machines:
* a headless build machine, AMD EPYC 7502P 32-Core Processor, with
GENERIC kernel;
* 3 Dell laptops of varying vintages with 4-core Intel CPUs with a
lightly-customized kernel based on GENERIC;
* 1 Thinkpad T14s, also with an Intel CPU, with GENERIC kernel.
The Thinkpad is completely ZFS-based; the others are UFS(+SU)-based (but
the headless build machine uses ZFS for ports & package-building (using
poudriere-devel)).
Each is amd64. Each uses meta-mode. Two of the Dell laptops use
ccache. Each machine has its own private local mirror of the
FreeBSD.org src, ports, & doc respoistories. The build machine
syncs from git.freebsd.org; the others sync from it (unless I'm
traveling with one of them).
In each case, I am logging in to each machine from a different (6th)
one, on which I run net/omnitty to mux the ssh sessions; on each, I run
tmux; within the tmux session, I do the builds within script(1).
I login to each again (from another omnitty session) to run
tail -9999999f $logfile | egrep '^(>>|(make\[[0-9]+\]|ld):)'
to track progress.
I have found it speeds things up a bit to detch the tmux sessions, so I
don't have 5 machines' worth of build-chatter spewing at one poor laptop
over a wireless link. :-}
The last few builds of head were:
main-n285812-bcecad2c24aa: Tue May 12 11:07:43 UTC 2026
main-n285848-1729d2f741a1: Wed May 13 11:10:51 UTC 2026
main-n285902-b8606c3406ea: Thu May 14 11:47:03 UTC 2026
main-n285916-e0c3d21e3b43: Fri May 15 10:52:11 UTC 2026
main-n285928-183633079178: Sat May 16 10:40:02 UTC 2026
More details are at https://www.catwhisker.org/~david/FreeBSD/history/,
in case that might be of interest.
Peace,
david
--
David H. Wolfskill [email protected]
See https://www.catwhisker.org/~david/publickey.gpg for my public key.
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