I actually have hundreds of these in my log on a ThinkPad X61.
[ 3844.989440] Pid: 8106, comm: events/1 Tainted: G W 2.6.27-7-generic #1
[ 3844.989448] [<c0131d65>] warn_slowpath+0x65/0x90
[ 3844.989465] [<c01376e6>] ? __do_softirq+0xf6/0x120
[ 3844.989478] [<c037d3f9>] ? mutex_trylock+0x9/0x30
[ 3844.989491] [<f88c2c17>] e1000_acquire_swflag_ich8lan+0x47/0xd0 [e1000e]
[ 3844.989515] [<f88c79e1>] e1000e_read_phy_reg_igp+0x21/0x70 [e1000e]
[ 3844.989538] [<f88c7c48>] e1000e_phy_has_link_generic+0x48/0xe0 [e1000e]
[ 3844.989559] [<f88c6a74>] e1000e_check_for_copper_link+0x34/0x90 [e1000e]
[ 3844.989580] [<f88d0d3b>] e1000_watchdog_task+0x47b/0x650 [e1000e]
[ 3844.989601] [<c0192350>] ? vmstat_update+0x0/0x30
[ 3844.989616] [<f88d08c0>] ? e1000_watchdog_task+0x0/0x650 [e1000e]
[ 3844.989637] [<c0143645>] run_workqueue+0x95/0x160
[ 3844.989648] [<c0147576>] ? finish_wait+0x16/0x70
[ 3844.989657] [<c01438e8>] worker_thread+0x88/0xf0
[ 3844.989666] [<c01474b0>] ? autoremove_wake_function+0x0/0x50
[ 3844.989676] [<c0143860>] ? worker_thread+0x0/0xf0
[ 3844.989685] [<c0147141>] kthread+0x41/0x80
[ 3844.989694] [<c0147100>] ? kthread+0x0/0x80
[ 3844.989704] [<c0105297>] kernel_thread_helper+0x7/0x10
[ 3844.989714] =======================
[ 3844.989719] ---[ end trace 1aa61db9484f7898 ]---
[ 3846.988168] ------------[ cut here ]------------
[ 3846.988182] WARNING: at
/build/buildd/linux-2.6.27/drivers/net/e1000e/ich8lan.c:403
e1000_acquire_swflag_ich8lan+0x47/0xd0 [e1000e]()
[ 3846.988191] e1000e mutex contention. Owned by pid -1
[ 3846.988198] Modules linked in: af_packet i915 drm rfcomm sco bridge stp bnep
l2cap ppdev ipv6 container sbs sbshc wmi pci_slot acpi_cpufreq
cpufreq_powersave cpufreq_stats cpufreq_conservative cpufreq_userspace
cpufreq_ondemand freq_table iptable_filter ip_tables x_tables sbp2 parport_pc
lp parport btusb bluetooth pcmcia arc4 ecb crypto_blkcipher thinkpad_acpi nvram
evdev serio_raw psmouse pcspkr iwlagn iwlcore snd_hda_intel rfkill snd_pcm_oss
snd_mixer_oss sdhci_pci battery sdhci led_class yenta_socket rsrc_nonstatic ac
mac80211 snd_pcm mmc_core cfg80211 pcmcia_core video output snd_seq_dummy
snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer
snd_seq_device snd button intel_agp iTCO_wdt iTCO_vendor_support soundcore
agpgart shpchp pci_hotplug snd_page_alloc ext3 jbd mbcache sd_mod crc_t10dif
ata_generic sg pata_acpi ahci ata_piix ohci1394 libata ieee1394 scsi_mod
ehci_hcd uhci_hcd usbcore dock e1000e thermal processor fan fbcon tileblit font
bitblit softcursor fuse
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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e1000e mutex contention
https://bugs.launchpad.net/bugs/291801
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