From: Arnd Bergmann <arnd@arndb.de>
To: Vegard Nossum <vegard.nossum@gmail.com>
Cc: Jiri Slaby <jirislaby@gmail.com>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: WARNING: at drivers/tty/tty_ldisc.c:766 tty_ldisc_reinit+0x7d/0x90()
Date: Tue, 19 Jul 2011 19:53:12 +0200 [thread overview]
Message-ID: <201107191953.12923.arnd@arndb.de> (raw)
In-Reply-To: <CAOMGZ=HS2EPkYD=5HfkSPpwPqHB5V3q0vaFmoZ8Hh+pMM9phrQ@mail.gmail.com>
On Tuesday 19 July 2011 13:33:36 Vegard Nossum wrote:
> [ 74.930391] [<c15e9879>] ? printk+0x18/0x1a
> [ 74.931650] [<c103e128>] warn_slowpath_common+0x68/0xa0
> [ 74.933367] [<c128515d>] ? tty_ldisc_reinit+0x7d/0x90
> [ 74.934907] [<c128515d>] ? tty_ldisc_reinit+0x7d/0x90
> [ 74.936242] [<c103e1fd>] warn_slowpath_null+0x1d/0x20
> [ 74.937584] [<c128515d>] tty_ldisc_reinit+0x7d/0x90
> [ 74.939152] [<c128577f>] tty_ldisc_hangup+0xdf/0x200
> [ 74.968743] [<c127e4f5>] __tty_hangup+0xe5/0x360
> [ 74.970158] [<c127ff3c>] disassociate_ctty+0x6c/0x200
> [ 74.971526] [<c104198b>] do_exit+0x55b/0x7d0
> [ 74.972745] [<c127dd20>] ? tty_write_lock+0x50/0x50
> [ 74.974052] [<c1041c79>] do_group_exit+0x39/0xa0
> [ 74.975338] [<c1041cf3>] sys_exit_group+0x13/0x20
> [ 74.976658] [<c15ec85c>] sysenter_do_call+0x12/0x2c
> [ 74.977938] [<c15e0000>] ? pci_fixup_i450gx+0x40/0x53
> [ 74.979462] ---[ end trace c3cfae8b1239077b ]---
>
> This is inside qemu/kvm with usb pass-through: -usbdevice host:9ac4:4b8f
>
> Any ideas?
This is the WARN_ON that Jiri added in 92f6fa09b "TTY: ldisc, do not close
until there are readers".
Is the login process that triggered this running on the USB device you pass
through, or do you have vga or serial console?
Arnd
next prev parent reply other threads:[~2011-07-19 17:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-19 11:33 WARNING: at drivers/tty/tty_ldisc.c:766 tty_ldisc_reinit+0x7d/0x90() Vegard Nossum
2011-07-19 17:53 ` Arnd Bergmann [this message]
2011-07-19 19:43 ` Vegard Nossum
2011-08-08 14:39 ` Jiri Slaby
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