netdev - e1000e driver - hang after 4 hours of uptime

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Date:	Thu, 18 Jun 2015 12:46:54 -0400
From:	Valdis Kletnieks <Valdis.Kletnieks@...edu>
To:	Yanir Lubetkin <yanirx.lubetkin@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: e1000e driver - hang after 4 hours of uptime - finally bisected!

(follow up to a report from last week - bisecting took a while as I could
only do 1 or 2 tests an evening)

My Dell Latitude E6530 crashes with a specific kernel lockup almost
exactly 4 hours after boot if there isn't a cable connected to the
Ethernet port:

[14508.846327] Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 0
[14468.229720] Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 0
[14463.254791] Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 0
[14491.134413] Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 1
[14463.396593] Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 2
[14490.390223] Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 1
[14494.680591] Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 0
[14513.365378] Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 1
[14482.271716] Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 3
[14479.906820] Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 0

As far as I can tell, the timestamp jitter is just how long it takes me to
enter the cryptLUKS passphrase for the hard drive at boot...

lspci tells me:

lspci -vvv -s "00:19.0"
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
        DeviceName:  Onboard LAN
        Subsystem: Dell Device 0535
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 28
        Region 0: Memory at f7700000 (32-bit, non-prefetchable) [size=128K]
        Region 1: Memory at f7739000 (32-bit, non-prefetchable) [size=4K]
        Region 2: I/O ports at f040 [size=32]
        Capabilities: [c8] Power Management version 2
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=1 PME-
        Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
                Address: 00000000fee00318  Data: 0000
        Capabilities: [e0] PCI Advanced Features
                AFCap: TP+ FLR+
                AFCtrl: FLR-
                AFStatus: TP-
        Kernel driver in use: e1000e


The traceback always looks like:

[14479.906820] Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 0

[14479.906908] Call Trace:
[14479.906914]  <NMI>  [<ffffffffba94db16>] dump_stack+0x50/0xa8
[14479.906930]  [<ffffffffba948bb9>] panic+0xcd/0x1e4
[14479.906940]  [<ffffffffba166a60>] ? perf_event_task_disable+0xc0/0xc0
[14479.906952]  [<ffffffffba125d8b>] watchdog_overflow_callback+0x9b/0xa0
[14479.906959]  [<ffffffffba16a684>] __perf_event_overflow+0xc4/0x1f0
[14479.906968]  [<ffffffffba16b3a4>] perf_event_overflow+0x14/0x20
[14479.906976]  [<ffffffffba022271>] intel_pmu_handle_irq+0x1e1/0x430
[14479.906990]  [<ffffffffba01a0f6>] perf_event_nmi_handler+0x26/0x40
[14479.906999]  [<ffffffffba0085b3>] nmi_handle+0x103/0x340
[14479.907005]  [<ffffffffba0084b5>] ? nmi_handle+0x5/0x340
[14479.907017]  [<ffffffffba008a53>] default_do_nmi+0xc3/0x120
[14479.907032]  [<ffffffffba008b98>] do_nmi+0xe8/0x130
[14479.907044]  [<ffffffffba95c9a8>] end_repeat_nmi+0x1e/0x2e
[14479.907055]  [<ffffffffba529886>] ? e1000e_cyclecounter_read+0x16/0xc0
[14479.907061]  [<ffffffffba529886>] ? e1000e_cyclecounter_read+0x16/0xc0
[14479.907069]  [<ffffffffba529886>] ? e1000e_cyclecounter_read+0x16/0xc0
[14479.907075]  <<EOE>>  [<ffffffffba0e9529>] timecounter_read+0x19/0x60
[14479.907088]  [<ffffffffba53687e>] e1000e_phc_gettime+0x2e/0x60
[14479.907098]  [<ffffffffba536a31>] e1000e_systim_overflow_work+0x31/0x70
[14479.907105]  [<ffffffffba07ad19>] process_one_work+0x3c9/0x980
[14479.907115]  [<ffffffffba07ac62>] ? process_one_work+0x312/0x980
[14479.907125]  [<ffffffffba07b348>] ? worker_thread+0x78/0x760
[14479.907134]  [<ffffffffba07b59c>] worker_thread+0x2cc/0x760
[14479.907144]  [<ffffffffba07b2d0>] ? process_one_work+0x980/0x980
[14479.907154]  [<ffffffffba082a5e>] kthread+0xfe/0x120
[14479.907163]  [<ffffffffba08ca50>] ? finish_task_switch+0x50/0x1c0
[14479.907173]  [<ffffffffba082960>] ? kthread_create_on_node+0x270/0x270
[14479.907179]  [<ffffffffba95ae4f>] ret_from_fork+0x3f/0x70
[14479.907188]  [<ffffffffba082960>] ? kthread_create_on_node+0x270/0x270
[14479.907243] Kernel Offset: 0x39000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)

Bisection tells me it's this commit:

commit 83129b37ef35bb6a7f01c060129736a8db5d31c4
Author: Yanir Lubetkin <yanirx.lubetkin@...el.com>
Date:   Tue Jun 2 17:05:45 2015 +0300

    e1000e: fix systim issues

    Two issues involving systim were reported.
    1. Clock is not running in the correct frequency
    2. In some situations, systim values were not incremented linearly
    This patch fixes the hardware clock configuration and the spurious
    non-linear increment.



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