guix: shepherd pid 1 holds /dev/console

OpenSubmitted by muradm.
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  • muradm
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M
M
muradm wrote on 24 Aug 2021 20:37
(address . bug-guix@gnu.org)
87pmu2n0qn.fsf@muradm.net
On IRC chat we identified an issue related to linux SAK, which
is explained here

Following the check what processes will be SAK'ed:

~# ls -l /proc/[0-9]*/fd/* | grep console
lrwx------ 1 root root 64 Aug 24 21:22 /proc/1/fd/1 ->
/dev/console
lrwx------ 1 root root 64 Aug 24 21:22 /proc/1/fd/2 ->
/dev/console
l-wx------ 1 root root 64 Aug 24 21:22 /proc/578/fd/4 ->
/dev/console
lrwx------ 1 root root 64 Aug 24 21:22 /proc/593/fd/1 ->
/dev/console
lrwx------ 1 root root 64 Aug 24 21:22 /proc/593/fd/2 ->
/dev/console
lrwx------ 1 root root 64 Aug 24 20:03 /proc/705/fd/1 ->
/dev/console
lrwx------ 1 root root 64 Aug 24 20:03 /proc/705/fd/2 ->
/dev/console
lrwx------ 1 root root 64 Aug 24 21:22 /proc/909/fd/1 ->
/dev/console
lrwx------ 1 root root 64 Aug 24 21:22 /proc/909/fd/2 ->
/dev/console

As it is seen from above output, pid 1 which is shepherd holds
/dev/console
making linux SAK feature useless. When SAK command issued by
shortcut keys,
all above proceses gets killed including pid 1 which is shepherd,
causing
system to stall.
?