Messages in this thread | | | Date | Wed, 27 Feb 2013 15:25:09 -0600 | From | Larry Finger <> | Subject | Re: WARNING from tty driver in 3.9-rc0 |
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On 02/27/2013 03:19 PM, Jiri Slaby wrote: > On 02/26/2013 10:56 PM, Daniel Mack wrote: >> On Tue, Feb 26, 2013 at 10:25 PM, Larry Finger >> <Larry.Finger@lwfinger.net> wrote: >>> 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. :) >> >> FWIW, I see the same on an ARM embedded board ... > > This one should be solved by Peter's "ldisc patchset". It didn't make it > to 3.9 though. Anyway, the warning was added for debugging purposes only > and it's apparently time to disable it now.
Jiri,
Thanks for looking into this. Will you be pushing a 3.9 patch to disable the warning?
Larry
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