Bug#672891: wireless brcms_c_wait_for_tx_completion warning
On Fri, May 25, 2012 at 11:34:07AM -0500, Jonathan Nieder wrote:
> Hi,
>
> Touko Korpela wrote:
>
> > Here is log from 3.2.18-1 kernel with X125 laptop. WARNING is there.
> [...]
> > Linux version 3.2.0-2-686-pae (Debian 3.2.18-1) (debian-kernel@lists.debian.org) (gcc version 4.6.3 (Debian 4.6.3-5) ) #1 SMP Mon May 21 18:24:12 UTC 2012
> [...]
> > ------------[ cut here ]------------
> > WARNING: at [...]/drivers/net/wireless/brcm80211/brcmsmac/main.c:8241 brcms_c_wait_for_tx_completion+0x73/0x7d [brcmsmac]()
> > Hardware name: X125
> > Modules linked in: cryptd aes_i586 aes_generic bridge stp bnep rfcomm powernow_k8 mperf cpufreq_stats cpufreq_userspace cpufreq_conservative cpufreq_powersave fuse loop snd_hda_codec_hdmi joydev arc4 brcmsmac mac80211 brcmutil snd_hda_codec_realtek radeon snd_hda_intel ttm drm_kms_helper drm uvcvideo snd_hda_codec snd_hwdep snd_pcm snd_seq tpm_tis tpm tpm_bios snd_timer ac button videodev media btusb evdev sp5100_tco snd_seq_device video battery processor k10temp snd samsung_laptop i2c_algo_bit pcspkr power_supply i2c_piix4 i2c_core bluetooth cfg80211 shpchp rfkill psmouse serio_raw soundcore crc8 snd_page_alloc cordic ext4 mbcache jbd2 crc16 usb_storage uas sd_mod crc_t10dif ohci_hcd ahci libahci libata ehci_hcd scsi_mod thermal thermal_sys usbcore usb_common sky2 [last unloaded: scsi_wait_scan]
> > Pid: 3127, comm: kworker/u:2 Not tainted 3.2.0-2-686-pae #1
> > Call Trace:
> > [<c1038468>] ? warn_slowpath_common+0x68/0x79
> > [<f8759e22>] ? brcms_c_wait_for_tx_completion+0x73/0x7d [brcmsmac]
> > [<c1038486>] ? warn_slowpath_null+0xd/0x10
> > [<f8759e22>] ? brcms_c_wait_for_tx_completion+0x73/0x7d [brcmsmac]
> > [<f875110f>] ? brcms_ops_flush+0x1f/0x29 [brcmsmac]
> > [<f86abdca>] ? ieee80211_scan_work+0x36a/0x3fb [mac80211]
> > [<c1049aef>] ? process_one_work+0x112/0x1fa
> > [<f86aba60>] ? ieee80211_scan_rx+0x139/0x139 [mac80211]
> > [<c104a7fa>] ? worker_thread+0xa9/0x122
> > [<c104a751>] ? manage_workers.isra.23+0x13d/0x13d
> > [<c104d13b>] ? kthread+0x63/0x68
> > [<c104d0d8>] ? kthread_worker_fn+0x101/0x101
> > [<c12c5c7e>] ? kernel_thread_helper+0x6/0x10
> > ---[ end trace b3b9484c4306740d ]---
>
> This is 20 hours after boot so I'm guessing it's not easy to reproduce.
> Alas. Thanks for reporting it.
>
> Do you think the patch added in 3.2.18 made a difference? How often
> were you getting the wait_for_tx_completion WARNING before, and are
> you getting it less often now? (I'm asking because this information
> would probably be helpful to upstream in diagnosing this.)
(last followup was sent to cloned bug by mistake)
Hard to say if it made difference, maybe made it more rare.
Logs show only a few this kind of warnings in last weeks running 3.2.1x
It always happens after many hours of uptime except 3.2.17-1 case that
happened sooner but it doesn't mean much.
That computer is always on doing some backround calculations that causes
small amount of network traffic and is sometimes used locally for browsing
and applying updates.
But should this bug be opened again?
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