WARNING from tty driver in 3.9-rc0

From: Larry Finger
Date: Tue Feb 26 2013 - 16:25:40 EST


Hi,

With v3.8-8693-gbf722a0 from the mainline repo, I get the following warning because the pointer for tty is NULL:

[ 34.956862] WARNING: at drivers/tty/tty_buffer.c:428 flush_to_ldisc+0x1bb/0x1c0()
[ 34.956865] Hardware name: HP Pavilion dv2700 Notebook PC
[ 34.956867] tty is NULL
[ 34.956869] Modules linked in: arc4 b43 mac80211 cfg80211 snd_hda_codec_conexant snd_hda_intel rfkill snd_hda_codec ipv6 snd_pcm kvm_amd snd_seq kvm bcma rng_core snd_timer snd_seq_device ssb mmc_core snd pcmcia sr_mod cdrom sg soundcore forcedeth pcmcia_core snd_page_alloc i2c_nforce2 i2c_core k8temp hwmon ehci_pci battery ac serio_raw joydev video wmi button autofs4 ext4 mbcache jbd2 crc16 ohci_hcd ehci_hcd usbcore usb_common thermal processor scsi_dh_alua scsi_dh_hp_sw scsi_dh_rdac scsi_dh_emc scsi_dh ata_generic pata_acpi pata_amd
[ 34.956936] Pid: 270, comm: kworker/1:1 Not tainted 3.8.0+ #92
[ 34.956939] Call Trace:
[ 34.956944] [<ffffffff812acc00>] ? flush_to_ldisc+0x120/0x1c0
[ 34.956951] [<ffffffff81040a4a>] warn_slowpath_common+0x7a/0xc0
[ 34.956955] [<ffffffff81040b31>] warn_slowpath_fmt+0x41/0x50
[ 34.956959] [<ffffffff812acc9b>] flush_to_ldisc+0x1bb/0x1c0
[ 34.956964] [<ffffffff810640f1>] process_one_work+0x1f1/0x660
[ 34.956968] [<ffffffff81064085>] ? process_one_work+0x185/0x660
[ 34.956972] [<ffffffff81064900>] worker_thread+0x110/0x380
[ 34.956978] [<ffffffff810a5b7d>] ? trace_hardirqs_on+0xd/0x10
[ 34.956982] [<ffffffff810647f0>] ? rescuer_thread+0x250/0x250
[ 34.956987] [<ffffffff81069e96>] kthread+0xd6/0xe0
[ 34.956992] [<ffffffff81424c9b>] ? _raw_spin_unlock_irq+0x2b/0x50
[ 34.956997] [<ffffffff81069dc0>] ? __init_kthread_worker+0x70/0x70
[ 34.957002] [<ffffffff81425a7c>] ret_from_fork+0x7c/0xb0
[ 34.957006] [<ffffffff81069dc0>] ? __init_kthread_worker+0x70/0x70
[ 34.957009] ---[ end trace f467d4f2302660c1 ]---
[ 35.585060] forcedeth 0000:00:0a.0: irq 42 for MSI/MSI-X
[ 35.585182] forcedeth 0000:00:0a.0 eth0: MSI enabled
[ 36.140711] ------------[ cut here ]------------


I have not yet bisected this problem yet; however, I can if requested. Being lazy, I hope that someone already has a patch, or can see the problem by inspection. :)

Thanks.

Larry
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