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SubjectWhy are not processes HUPped when they open /dev/console?
Hello,

don't you remember by a chance the reason for this test in __tty_hangup:
if (filp->f_op->write != tty_write)

The logic there is not to HUP processes that have this tty open via
/dev/console.

It is there like forever. But now, due to that, processes that do
vhangup of /dev/ttyXYZ wait infinitely if there is some other process
that has the ttyXYZ open through /dev/console. (Due to infinite wait in
tty_ldisc_hangup.)

This happens on some distros on shutdown path because they do vhangup on
all tty[0-8] ttyS[01] and similar.

thanks,
--
js
suse labs


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