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SubjectWARNING at: drivers/char/tty_ldisc.c
Hello Linus, Ogawa,
Looks like we have one more bug in tty code:
'shutdown -r now' in 'single' user mode gives following trace:

WARNING at: drivers/char/tty_ldisc.c:209 tty_ldisc_put+0x95/0xa0
---
?printk+0x23/0x36
warn_slowpath_common+0x78/0xa0
?tty_ldisc_put+0x95/0xa0
?tty_ldisc_put+0x95/0xa0
warn_slowpath_null+0x21/0x40
tty_ldisc_put+0x95/0xa0
tty_ldisc_hangup+0xfc/0x1f0
do_tty_hangup+0x131/0x380
disassociate_ctty+0x50/0x210
do_exit+0x6b8/0x700
?put_lock_stats+0x18/0x50
?lock_release_holdtime+0xb2/0x190
?_spin_unlock_irq+0x30/0x70
?trace_hardirqs_on_caller+0x14c/0x1a0
do_group_exit+0x45/0xb0
get_signal_to_deliver+0x226/0x410
do_notify_resume+0xc1+0xa90
?trace_hardirqs_on+0x19/0x40
?_spin_unlock_irqrestore+0x47/0x90
?remove_wait_queue+0x47/0x70
?do_wait+0x19d/0x310
?defult_wake_function+0x0/0x40
?sys_wait4+0xa1/0x100
work_notifysig+0x13/0x19

//There is no trace in syslog, so given one is 'copy-paste' from the paper.

Sergey[unhandled content-type:application/pgp-signature]
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