linux-kernel - Re: WARNING: at drivers/tty/tty

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Date:	Fri, 18 Jan 2013 13:07:28 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: WARNING: at drivers/tty/tty_buffer.c:476  (tty is NULL)

On Fri, Jan 18, 2013 at 03:53:58PM -0500, Dave Jones wrote:
> On Wed, Jan 02, 2013 at 10:37:44AM -0500, Dave Jones wrote:
>  > This happened a few times to my test boxes I left running over the holidays..
>  > 
>  > [ 8419.797533] ------------[ cut here ]------------
>  > [ 8419.798341] WARNING: at drivers/tty/tty_buffer.c:476 flush_to_ldisc+0x1de/0x1f0()
>  > [ 8419.800313] Hardware name: GA-MA78GM-S2H
>  > [ 8419.800887] tty is NULL
>  > [ 8419.801857] Modules linked in: fuse binfmt_misc bnep rfcomm hidp scsi_transport_iscsi can_raw can_bcm ipt_ULOG nfnetlink l2tp_ppp l2tp_core can caif_socket rose nfc caif ipx phonet irda p8023 p8022 netrom rds ax25 atm af_rxrpc crc_ccitt appletalk psnap llc2 af_key decnet llc pppoe pppox ppp_generic x25 slhc lockd sunrpc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_conntrack nf_conntrack ip6table_filter ip6_tables btusb bluetooth snd_hda_codec_realtek usb_debug rfkill snd_hda_intel snd_hda_codec microcode snd_pcm serio_raw snd_page_alloc pcspkr edac_core snd_timer snd soundcore r8169 mii vhost_net tun macvtap macvlan kvm_amd kvm
>  > [ 8419.811268] Pid: 4980, comm: kworker/0:1 Not tainted 3.8.0-rc1+ #43
>  > [ 8419.812159] Call Trace:
>  > [ 8419.812586]  [<ffffffff81044aef>] warn_slowpath_common+0x7f/0xc0
>  > [ 8419.813504]  [<ffffffff81044be6>] warn_slowpath_fmt+0x46/0x50
>  > [ 8419.814353]  [<ffffffff8132b59a>] ? ___ratelimit+0x9a/0x120
>  > [ 8419.815146]  [<ffffffff813e5a8e>] flush_to_ldisc+0x1de/0x1f0
>  > [ 8419.815982]  [<ffffffff81068a77>] process_one_work+0x207/0x750
>  > [ 8419.816844]  [<ffffffff81068a07>] ? process_one_work+0x197/0x750
>  > [ 8419.817731]  [<ffffffff810b2342>] ? get_lock_stats+0x22/0x70
>  > [ 8419.818605]  [<ffffffff813e58b0>] ? tty_insert_flip_string_fixed_flag+0x110/0x110
>  > [ 8419.819725]  [<ffffffff81069396>] worker_thread+0x156/0x440
>  > [ 8419.820575]  [<ffffffff81069240>] ? rescuer_thread+0x240/0x240
>  > [ 8419.821463]  [<ffffffff8106fd8d>] kthread+0xed/0x100
>  > [ 8419.822174]  [<ffffffff810b27ae>] ? put_lock_stats.isra.23+0xe/0x40
>  > [ 8419.823125]  [<ffffffff8106fca0>] ? kthread_create_on_node+0x160/0x160
>  > [ 8419.824114]  [<ffffffff816a49dc>] ret_from_fork+0x7c/0xb0
>  > [ 8419.824943]  [<ffffffff8106fca0>] ? kthread_create_on_node+0x160/0x160
>  > [ 8419.845167] ---[ end trace 0c3565bace6c005f ]---
> 
> 
> Still seeing this in rc4

Jiri, was there anything on the mailing list that I missed that should
have resolved this issue?  I thought it was being worked on, but I can't
seem to find any resolution at the moment.

thanks,

greg k-h
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