On 2021-05-20 09:01, Michael Gmelin wrote:
Hi,
I'm leaving this here, mostly so that others (or future me) can google
it up.
Traditionally, CTRL-t would give a one-line output + whatever the
process specific signal handler comes up with:
# sleep 120 <--- hits CTRL-t
load: 0.27 cmd: sleep 38162 [nanslp] 0.64r 0.00u 0.00s 0% 1780k
sleep: about 119 second(s) left out of the original 120
# cat <--- hits CTRL-t
load: 0.02 cmd: cat 24379 [ttyin] 0.63r 0.00u 0.00s 0% 2308k
On 13 I get:
# sleep 120 <--- hits CTRL-t
load: 0.12 cmd: sleep 3241 [nanslp] 0.52r 0.00u 0.00s 0% 2172k
mi_switch+0xc1 sleepq_catch_signals+0x2e6 sleepq_timedwait_sig+0x12
_sleep+0x199 kern_clock_nanosleep+0x1e1 sys_nanosleep+0x3b
amd64_syscall+0x10c fast_syscall_common+0xf8 sleep: about 119
second(s) left out of the original 120
# cat <--- hits CTRL-t
load: 0.09 cmd: cat 3240 [ttyin] 0.23r 0.00u 0.00s 0% 2300k
mi_switch+0xc1 sleepq_catch_signals+0x2e6 sleepq_wait_sig+0x9
_cv_wait_sig+0xe4 tty_wait+0x1c ttydisc_read+0x2ac ttydev_read+0x56
devfs_read_f+0xd5 dofileread+0x81 sys_read+0xbc amd64_syscall+0x10c
fast_syscall_common+0xf8
YIKES!
Can you say POLA? ;-)
which is quite way too verbose when checking the progress of
long-running processes, like cp, dd, or poudriere. Especially as CTRL-t
is part of the user experience to me - I use it to interact with the
machine outside of debugging software issues.
Setting
sysctl kern.tty_info_kstacks=0
echo kern.tty_info_kstacks=0 >>/etc/sysctl.conf
Thanks! :-)
fixes this permanently.
Apparently, this was enabled by default on purpose[0], so that people
find the feature (which certainly worked ^_^), but I think it would
been worth mentioning the sysctl somewhere in the release notes/errata,
so that people understand how to disable it again.
UPDATING?
Best
Michael
Thanks for mentioning it, Michael.
--Chris
[0]https://cgit.freebsd.org/src/commit/sys/kern/tty_info.c?h=releng/13.0&id=508a6e84e785f642545b81c3ecb325685a2e56a7
