On Thu, Aug 25, 2016 at 12:29 AM, Luca Coelho [off-list ref] wrote:

Hi Andy,

Sorry for the really long delay in replying. :(

On Sun, 2016-08-07 at 01:54 -0700, Andy Lutomirski wrote:

quoted

My Intel 7265 used to work flawlessly, but for the past week or two
it
has seemed to be very unreliable.  It's also throwing errors.  I see
problems on firmware versions 16 and 21, although I haven't gotten
the
warning and backtrace on firmware 16 yet.

I have:

iwlwifi 0000:3a:00.0: enabling device (0000 -> 0002)
iwlwifi 0000:3a:00.0: Unsupported splx structure
iwlwifi 0000:3a:00.0: loaded firmware version 21.302800.0 op_mode
iwlmvm
iwlwifi 0000:3a:00.0: Detected Intel(R) Dual Band Wireless AC 7265,
REV=0x210
iwlwifi 0000:3a:00.0: L1 Enabled - LTR Disabled
iwlwifi 0000:3a:00.0: L1 Enabled - LTR Disabled


I just got this error on 4.7.0:

[324188.495734] wlp58s0: associated
[324281.259579] iwlwifi 0000:3a:00.0: Queue 16 stuck for 10000 ms.

This seems to be a recurring error with the AC-7265. :( We even added
an entry about it in our wiki:

https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi#about_platform_noise

Shouldn't that cause packet loss, not actual stuck queues?  Or is the
problem that the device literally can't transmit at all for 10 seconds
and the driver eventually gets sick of waiting?  Could the driver
learn to detect this more sensibly, drop the packets cleanly after
some timeout, and maybe log a message about extremely high noise?

quoted

quoted

[324281.263732] iwlwifi 0000:3a:00.0: Start IWL Error Log Dump:
[324281.263739] iwlwifi 0000:3a:00.0: Status: 0x00000000, count: 6
[324281.263745] iwlwifi 0000:3a:00.0: Loaded firmware version: 21.302800.0
[324281.263751] iwlwifi 0000:3a:00.0: 0x00000084 | NMI_INTERRUPT_UNKNOWN

We have a bugzilla entry with the queue stuck + NMI trigger:

https://bugzilla.kernel.org/show_bug.cgi?id=112931

Unfortunately nothing was found out by our firmware team regarding this
yet.

Sad :(

quoted

Earlier on the same boot I got:

[266562.042662] ------------[ cut here ]------------
[266562.042693] WARNING: CPU: 2 PID: 994 at
drivers/net/wireless/intel/iwlwifi/mvm/tx.c:1377
iwl_mvm_rx_tx_cmd+0x665/0x870 [iwlmvm]

We also have an open bugzilla entry with similar WARNING:

https://bugzilla.kernel.org/show_bug.cgi?id=153381


So, first I'd recommend that you follow the recommended workarounds in
our wiki.  If that doesn't help and you still want to try to help us
debug this, please open a bugzilla so we can track it more easily.

I haven't seem any of these problems on 4.8-rc yet.  I'll keep you
posted if I do.