Hello, since linux-3.0 (I don't remember if it was the case even before), I'm getting this output in dmesg: [ 53.662990] ------------[ cut here ]------------ [ 53.663016] WARNING: at drivers/iommu/intel-iommu.c:2911 intel_unmap_page+0x14b/0x180() [ 53.663047] Hardware name: Latitude E5420 [ 53.663066] Driver unmaps unmatched page at PFN ffd1a000 [ 53.663091] Modules linked in: usb_storage hid_cherry usbhid uvcvideo videobuf2_core videodev v4l2_compat_ioctl32 videobuf2_vmalloc videobuf2_memops iwlwifi mac80211 cfg80211 snd_hda_codec_hdmi snd_hda_codec_idt psmouse snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore snd_page_alloc ehci_hcd usbcore usb_common [ 53.663106] Pid: 1852, comm: ifconfig Tainted: G W 3.3.2-pf #1 [ 53.663107] Call Trace: [ 53.663109] [<ffffffff8137dc00>] ? intel_unmap_page+0x70/0x180 [ 53.663113] [<ffffffff8103102b>] ? warn_slowpath_common+0x7b/0xc0 [ 53.663116] [<ffffffff81031125>] ? warn_slowpath_fmt+0x45/0x50 [ 53.663119] [<ffffffff814874e3>] ? _raw_spin_unlock_irqrestore+0x13/0x40 [ 53.663121] [<ffffffff8137dcdb>] ? intel_unmap_page+0x14b/0x180 [ 53.663127] [<ffffffffa015f32c>] ? iwl_trans_rxq_free_rx_bufs+0x4c/0xf0 [iwlwifi] [ 53.663131] [<ffffffffa016079c>] ? iwl_trans_pcie_start_device+0x17c/0xdf0 [iwlwifi] [ 53.663135] [<ffffffffa014dc3d>] ? iwl_load_ucode_wait_alive+0x2d/0x3a0 [iwlwifi] [ 53.663138] [<ffffffff810579e9>] ? get_parent_ip+0x9/0x20 [ 53.663140] [<ffffffff810579e9>] ? get_parent_ip+0x9/0x20 [ 53.663142] [<ffffffff81057a87>] ? sub_preempt_count+0x87/0xb0 [ 53.663144] [<ffffffff814874e3>] ? _raw_spin_unlock_irqrestore+0x13/0x40 [ 53.663147] [<ffffffffa014c7ee>] ? iwlagn_mac_start+0x12e/0x1f0 [iwlwifi] [ 53.663154] [<ffffffffa010fa66>] ? ieee80211_do_open+0x276/0x6a0 [mac80211] [ 53.663158] [<ffffffffa010dd12>] ? ieee80211_check_concurrent_iface+0x22/0x1a0 [mac80211] [ 53.663162] [<ffffffff8139c3c6>] ? __dev_open+0x86/0xd0 [ 53.663164] [<ffffffff8139c63a>] ? __dev_change_flags+0x9a/0x180 [ 53.663166] [<ffffffff8139c7d0>] ? dev_change_flags+0x20/0x70 [ 53.663169] [<ffffffff813f7a8f>] ? devinet_ioctl+0x5bf/0x750 [ 53.663172] [<ffffffff81383289>] ? sock_do_ioctl+0x29/0x60 [ 53.663174] [<ffffffff81383323>] ? sock_ioctl+0x63/0x2b0 [ 53.663177] [<ffffffff8110773e>] ? do_vfs_ioctl+0x8e/0x4f0 [ 53.663179] [<ffffffff81107c38>] ? sys_ioctl+0x98/0xa0 [ 53.663181] [<ffffffff81488022>] ? system_call_fastpath+0x16/0x1b [ 53.663183] ---[ end trace e93713a9d40cd06e ]--- I tried to dig a bit but I didn't really understand how this slowpath warning should be interpreted. However the card seems to work fine. I'm experiencing some kernel panic from time to time, but I cannot understand if it is really realted to this issue or not. I hope this output makes sense for someone. Best regards, -- Antonio Quartulli ..each of us alone is worth nothing.. Ernesto "Che" Guevara
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