Date:	Wed, 15 Jul 2015 20:48:52 +0300
From:	Emmanuel Grumbach <egrumbach@...il.com>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	linux-wireless <linux-wireless@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: iwlwifi: Microcode SW error detected. Restarting 0x2000000.

>>
>> On Tue, Jul 14, 2015 at 12:53 AM, Toralf Förster <toralf.foerster@....de> wrote:
>>> At a Gentoo (hardened) I experienced - starting with hardened kernel 4.0.6-r1 - the (attached) hickup of the "03:00.0 Network controller: Intel Corporation Wireless 7260 (rev 83)" at a ThinkPad T440s. The network stucks till I do restart the network device using /etc/init.d/net.wlp3s0.
>>
>> You are not using the latest firmware. Please upgrade to 25.17.12.0.
>> You'll be able to find the firmware here:
>> https://git.kernel.org/cgit/linux/kernel/git/iwlwifi/linux-firmware.git/plain/iwlwifi-7260-12.ucode
>>
>
> With the mentioned firmware and 4.0.8 I get now repaetingly (restart of the servcie helped):
>

Ouch.
The stack doesn't make much sense, but it seems that you are still
suffering from the stuck queue. The WARNING itself (Timeout waiting
for hardware access) is interesting.
Can you reproduce easily?

What bandwidth are you using? 20Mhz or 40Mhz?

>
>
> Jul 15 15:21:32 t44 kernel: ieee80211 phy0: Hardware restart was requested
> Jul 15 15:21:34 t44 kernel: ------------[ cut here ]------------
> Jul 15 15:21:34 t44 kernel: WARNING: CPU: 0 PID: 0 at drivers/net/wireless/iwlwifi/pcie/trans.c:1385 iwl_trans_pcie_grab_nic_access+0x14b/0x160 [iwlwifi]()
> Jul 15 15:21:34 t44 kernel: Timeout waiting for hardware access (CSR_GP_CNTRL 0x080003d8)
> Jul 15 15:21:34 t44 kernel: Modules linked in: nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables ipt_MASQUERADE nf_nat_masquerade_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_limit ipt_REJECT nf_reject_ipv4 xt_recent xt_tcpudp xt_conntrack iptable_raw iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_filter ip_tables x_tables nfsd auth_rpcgss oid_registry lockd grace ctr ccm sunrpc af_packet bridge stp llc tun rc_dib0700_rc5 hid_cherry dib7000p hid_generic usbhid hid dvb_usb_dib0700 dib3000mc dvb_usb dvb_core dib0070 dib7000m dibx000_common dib0090 rc_core usblp snd_hda_codec_generic arc4 rtsx_pci_sdmmc mmc_core evdev x86_pkg_temp_thermal coretemp kvm_intel kvm iwlmvm aesni_intel aes_x86_64 glue_helper mac80211 lrw gf128mul ablk_helper cryptd psmouse iwlwifi pcspkr atkbd
> Jul 15 15:21:34 t44 kernel:  i2c_i801 i915 cfg80211 cfbfillrect rtsx_pci cfbimgblt fbcon bitblit thermal i2c_algo_bit softcursor font cfbcopyarea wmi drm_kms_helper snd_hda_intel snd_hda_controller snd_hda_codec drm snd_pcm i2c_core thinkpad_acpi intel_gtt snd_timer nvram battery agpgart rfkill ac tpm_tis tpm xhci_pci ehci_pci xhci_hcd ehci_hcd video lpc_ich mfd_core fb button fbdev usbcore snd processor e1000e thermal_sys usb_common soundcore hwmon [last unloaded: microcode]
> Jul 15 15:21:34 t44 kernel: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.0.8-hardened #1
> Jul 15 15:21:34 t44 kernel: Hardware name: LENOVO 20AQCTO1WW/20AQCTO1WW, BIOS GJET83WW (2.33 ) 03/09/2015
> Jul 15 15:21:34 t44 kernel:  ffffffff810dc4c6 0000000000000000 ffffffffc05ca3a8 ffff88033e203c58
> Jul 15 15:21:34 t44 kernel:  ffffffff8159675c 0000000000000000 ffff88033e203ca8 ffff88033e203c98
> Jul 15 15:21:34 t44 kernel:  ffffffff81059fea ffffffffc05c8c18 ffffffffc05ca3a8 0000000000000569
> Jul 15 15:21:34 t44 kernel: Call Trace:
> Jul 15 15:21:34 t44 kernel:  <IRQ>  [<ffffffff810dc4c6>] ? print_modules+0x76/0xe0
> Jul 15 15:21:34 t44 kernel:  [<ffffffffc05ca3a8>] ? iwl8000_base_params+0x1c68/0x299b [iwlwifi]
> Jul 15 15:21:34 t44 kernel:  [<ffffffff8159675c>] dump_stack+0x45/0x5d
> Jul 15 15:21:34 t44 kernel:  [<ffffffff81059fea>] warn_slowpath_common+0x8a/0xd0
> Jul 15 15:21:34 t44 kernel:  [<ffffffffc05c8c18>] ? iwl8000_base_params+0x4d8/0x299b [iwlwifi]
> Jul 15 15:21:34 t44 kernel:  [<ffffffffc05ca3a8>] ? iwl8000_base_params+0x1c68/0x299b [iwlwifi]
> Jul 15 15:21:34 t44 kernel:  [<ffffffffc05ca5f8>] ? iwl8000_base_params+0x1eb8/0x299b [iwlwifi]
> Jul 15 15:21:34 t44 kernel:  [<ffffffffc05bed30>] ? iwl_trans_pcie_write32+0x40/0x40 [iwlwifi]
> Jul 15 15:21:34 t44 kernel:  [<ffffffff8105a08a>] warn_slowpath_fmt+0x5a/0x70
> Jul 15 15:21:34 t44 kernel:  [<ffffffffc05ca5f8>] ? iwl8000_base_params+0x1eb8/0x299b [iwlwifi]
> Jul 15 15:21:34 t44 kernel:  [<ffffffffc05b4045>] ? iwl_poll_bit+0x45/0x90 [iwlwifi]
> Jul 15 15:21:34 t44 kernel:  [<ffffffffc05c0aeb>] iwl_trans_pcie_grab_nic_access+0x14b/0x160 [iwlwifi]
> Jul 15 15:21:34 t44 kernel:  [<ffffffffc05b40c7>] iwl_read_direct32+0x37/0x80 [iwlwifi]
> Jul 15 15:21:34 t44 kernel:  [<ffffffffc05bb5f8>] iwl_pcie_txq_stuck_timer+0x138/0x3e0 [iwlwifi]
> Jul 15 15:21:34 t44 kernel:  [<ffffffffc05bb4c0>] ? iwl_pcie_alloc_dma_ptr.isra.23+0x110/0x110 [iwlwifi]
> Jul 15 15:21:34 t44 kernel:  [<ffffffff810bc0b7>] call_timer_fn+0x47/0x140
> Jul 15 15:21:34 t44 kernel:  [<ffffffff810bc551>] run_timer_softirq+0x291/0x450
> Jul 15 15:21:34 t44 kernel:  [<ffffffffc05bb4c0>] ? iwl_pcie_alloc_dma_ptr.isra.23+0x110/0x110 [iwlwifi]
> Jul 15 15:21:34 t44 kernel:  [<ffffffff8105e6a8>] __do_softirq+0xf8/0x290
> Jul 15 15:21:34 t44 kernel:  [<ffffffff8105ea85>] irq_exit+0xa5/0xb0
> Jul 15 15:21:34 t44 kernel:  [<ffffffff815a0975>] smp_apic_timer_interrupt+0x55/0x70
> Jul 15 15:21:34 t44 kernel:  [<ffffffff8159eb13>] apic_timer_interrupt+0x83/0x90
> Jul 15 15:21:34 t44 kernel:  <EOI>  [<ffffffff810bee15>] ? __hrtimer_start_range_ns+0x1a5/0x3d0
> Jul 15 15:21:34 t44 kernel:  [<ffffffff8147c7b7>] ? cpuidle_enter_state+0x87/0x1a0
> Jul 15 15:21:34 t44 kernel:  [<ffffffff8147c939>] cpuidle_enter+0x29/0x40
> Jul 15 15:21:34 t44 kernel:  [<ffffffff8109b6d8>] cpu_startup_entry+0x358/0x3e0
> Jul 15 15:21:34 t44 kernel:  [<ffffffff81c12120>] ? early_idt_handler_array+0x120/0x120
> Jul 15 15:21:34 t44 kernel:  [<ffffffff8158cc42>] rest_init+0x72/0x80
> Jul 15 15:21:34 t44 kernel:  [<ffffffff81c13ad2>] start_kernel+0x610/0x621
> Jul 15 15:21:34 t44 kernel:  [<ffffffff81c13050>] ? set_init_arg+0xc7/0xc7
> Jul 15 15:21:34 t44 kernel:  [<ffffffff81c7ac38>] ? memblock_reserve+0x81/0x8f
> Jul 15 15:21:34 t44 kernel:  [<ffffffff81c126f8>] x86_64_start_reservations+0x5e/0x68
> Jul 15 15:21:34 t44 kernel:  [<ffffffff81c12881>] x86_64_start_kernel+0x17f/0x194
> Jul 15 15:21:34 t44 kernel: ---[ end trace 06dfec9f8d69e13b ]---
>
>
> few time within of that I saw :
> Jul 15 15:21:39 t44 dhcpcd[2582]: wlp3s0: carrier lost
> Jul 15 15:21:39 t44 wpa_cli: interface wlp3s0 DISCONNECTED
> Jul 15 15:21:39 t44 wpa_cli: executing 'false /etc/init.d/net.wlp3s0 --quiet stop' failed
> Jul 15 15:21:39 t44 dhcpcd[2582]: wlp3s0: deleting address fd00::674f:8c20:a0a:2cef/64
> Jul 15 15:21:39 t44 dhcpcd[2582]: wlp3s0: deleting route to fd00::/64
> Jul 15 15:21:39 t44 kernel:  [<ffffffff8107c986>] kthread+0xf6/0x110
> Jul 15 15:21:39 t44 kernel:  [<ffffffff8107c890>] ? kthread_create_on_node+0x1b0/0x1b0
> Jul 15 15:21:39 t44 kernel:  [<ffffffff8159dc19>] ret_from_fork+0x49/0x80
> Jul 15 15:21:39 t44 kernel:  [<ffffffff8107c890>] ? kthread_create_on_node+0x1b0/0x1b0
> Jul 15 15:21:39 t44 kernel: ---[ end trace 06dfec9f8d69e13e ]---
> Jul 15 15:21:39 t44 kernel: wlp3s0: deauthenticating from 08:96:d7:05:f9:2a by local choice (Reason: 3=DEAUTH_LEAVING)
> Jul 15 15:21:39 t44 kernel: ------------[ cut here ]------------
> Jul 15 15:21:39 t44 kernel: WARNING: CPU: 2 PID: 3950 at net/mac80211/driver-ops.h:12 ieee80211_bss_info_change_notify+0x19c/0x1f0 [mac80211]()
> Jul 15 15:21:39 t44 kernel: wlp3s0:  Failed check-sdata-in-driver check, flags: 0x4
>
>
>
>
> --
> Toralf, pgp key: 872AE508 0076E94E
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