(In reply to Chris Mayo from comment #1) > Similarly on a Z68 motherboard with Asmedia ASM1042 USB 3.0. Works fine in > the Z68 USB 2.0 port. I experience disconnections on Lenovo IdeaPad-Z500 Touch (board name is `INVALID`, bios version `71CN45WW(V1.18)`). The disconnections occur on the USB 2.0 port, too. I'm not sure whether the issues are related to and/or caused by btrfs errors or whether the btrfs errors are caused by the network failure (most likely because I've mounted some btrfs file images over cifs). `dmesg` [25266.546652] BTRFS info (device dm-0): disk space caching is enabled [25399.538504] CIFS VFS: Send error in Flush = -9 [25400.281124] BTRFS: bdev /dev/mapper/image_lvm-image_lvm_01 errs: wr 0, rd 0, flush 1, corrupt 0, gen 0 [25400.281133] BTRFS: error (device dm-0) in write_all_supers:3442: errno=-5 IO failure (errors while submitting device barriers.) [25400.281135] BTRFS info (device dm-0): forced readonly [25400.281138] BTRFS warning (device dm-0): Skipping commit of aborted transaction. [25400.281139] ------------[ cut here ]------------ [25400.281168] WARNING: CPU: 3 PID: 13339 at /home/apw/COD/linux/fs/btrfs/super.c:259 __btrfs_abort_transaction+0x5f/0x130 [btrfs]() [25400.281181] BTRFS: Transaction aborted (error -5) [25400.281182] Modules linked in: ax88179_178a(OE) xfs libcrc32c usbnet md4 nls_utf8 cifs msr nls_iso8859_1 pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bbswitch(OE) btrfs xor bridge stp llc iptable_filter ip_tables x_tables raid6_pq snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec rfcomm intel_rapl arc4 snd_hwdep bnep x86_pkg_temp_thermal hid_generic nfsd intel_powerclamp uas uvcvideo hid_multitouch iwldvm snd_pcm videobuf2_vmalloc coretemp videobuf2_memops videobuf2_core kvm_intel auth_rpcgss mac80211 v4l2_common nfs_acl videodev usb_storage media snd_seq_midi kvm nfs snd_seq_midi_event snd_rawmidi snd_seq lockd usbhid binfmt_misc crct10dif_pclmul sunrpc crc32_pclmul fscache ghash_clmulni_intel snd_seq_device snd_timer hid aesni_intel iwlwifi btusb aes_x86_64 snd lrw gf128mul bluetooth glue_helper ablk_helper cfg80211 cryptd soundcore joydev 6lowpan_iphc serio_raw mei_me mei parport_pc lpc_ich ppdev ideapad_laptop lp sparse_keymap mac_hid parport zfs(POE) zunicode(POE) zavl(POE) zcommon(POE) znvpair(POE) spl(OE) i915 i2c_algo_bit drm_kms_helper psmouse ahci drm r8169 libahci mii video [last unloaded: ax88179_178a] [25400.281250] CPU: 3 PID: 13339 Comm: btrfs-transacti Tainted: P W OE 3.16.2-031602-generic #201409052035 [25400.281251] Hardware name: LENOVO 20221/INVALID, BIOS 71CN45WW(V1.18) 05/10/2013 [25400.281252] 0000000000000103 ffff8800127a3c28 ffffffff8178824b 0000000000000007 [25400.281254] ffff8800127a3c78 ffff8800127a3c68 ffffffff8107207c ff003601127a3c98 [25400.281268] ffff880024125800 ffff880088208460 00000000fffffffb 0000000000000623 [25400.281270] Call Trace: [25400.281274] [] dump_stack+0x46/0x58 [25400.281277] [] warn_slowpath_common+0x8c/0xc0 [25400.281280] [] warn_slowpath_fmt+0x46/0x50 [25400.281286] [] __btrfs_abort_transaction+0x5f/0x130 [btrfs] [25400.281296] [] cleanup_transaction+0x6e/0x2d0 [btrfs] [25400.281298] [] ? __wake_up_sync+0x20/0x20 [25400.281300] [] ? __wake_up+0x53/0x70 [25400.281309] [] btrfs_commit_transaction.part.34+0x70a/0xa10 [btrfs] [25400.281316] [] ? btrfs_run_delayed_refs.part.81+0x230/0x290 [btrfs] [25400.281324] [] btrfs_commit_transaction+0x46/0x80 [btrfs] [25400.281331] [] transaction_kthread+0x1d5/0x250 [btrfs] [25400.281338] [] ? open_ctree+0x1f70/0x1f70 [btrfs] [25400.281340] [] kthread+0xc9/0xe0 [25400.281342] [] ? flush_kthread_worker+0xb0/0xb0 [25400.281345] [] ret_from_fork+0x7c/0xb0 [25400.281347] [] ? flush_kthread_worker+0xb0/0xb0 [25400.281348] ---[ end trace 046c154d782816fb ]--- [25400.281350] BTRFS: error (device dm-0) in cleanup_transaction:1571: errno=-5 IO failure [25400.281351] BTRFS info (device dm-0): delayed_refs has NO entry [25400.281375] BTRFS info (device dm-0): delayed_refs has NO entry [25463.358613] BTRFS info (device dm-0): disk space caching is enabled [25490.458596] net_ratelimit: 629 callbacks suppressed [25490.458604] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25490.459238] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25490.459244] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25490.459741] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25490.459772] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25490.459776] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25490.459780] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25490.459784] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25490.459788] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25490.459792] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25498.005670] net_ratelimit: 1024 callbacks suppressed [25498.005676] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25498.005685] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25498.005708] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25498.005712] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25498.005715] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25498.005718] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25498.005721] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25498.005723] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25498.005726] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25498.005729] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25505.417553] CIFS VFS: Send error in Flush = -9 [25507.383151] BTRFS: bdev /dev/mapper/image_lvm-image_lvm_01 errs: wr 0, rd 0, flush 1, corrupt 0, gen 0 [25507.383159] BTRFS: error (device dm-0) in write_all_supers:3442: errno=-5 IO failure (errors while submitting device barriers.) [25507.383161] BTRFS info (device dm-0): forced readonly [25507.383164] BTRFS warning (device dm-0): Skipping commit of aborted transaction. [25507.383165] ------------[ cut here ]------------ [25507.383180] WARNING: CPU: 4 PID: 13389 at /home/apw/COD/linux/fs/btrfs/super.c:259 __btrfs_abort_transaction+0x5f/0x130 [btrfs]() [25507.383181] BTRFS: Transaction aborted (error -5) [25507.383182] Modules linked in: ax88179_178a(OE) xfs libcrc32c usbnet md4 nls_utf8 cifs msr nls_iso8859_1 pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bbswitch(OE) btrfs xor bridge stp llc iptable_filter ip_tables x_tables raid6_pq snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec rfcomm intel_rapl arc4 snd_hwdep bnep x86_pkg_temp_thermal hid_generic nfsd intel_powerclamp uas uvcvideo hid_multitouch iwldvm snd_pcm videobuf2_vmalloc coretemp videobuf2_memops videobuf2_core kvm_intel auth_rpcgss mac80211 v4l2_common nfs_acl videodev usb_storage media snd_seq_midi kvm nfs snd_seq_midi_event snd_rawmidi snd_seq lockd usbhid binfmt_misc crct10dif_pclmul sunrpc crc32_pclmul fscache ghash_clmulni_intel snd_seq_device snd_timer hid aesni_intel iwlwifi btusb aes_x86_64 snd lrw gf128mul bluetooth glue_helper ablk_helper cfg80211 cryptd soundcore joydev 6lowpan_iphc serio_raw mei_me mei parport_pc lpc_ich ppdev ideapad_laptop lp sparse_keymap mac_hid parport zfs(POE) zunicode(POE) zavl(POE) zcommon(POE) znvpair(POE) spl(OE) i915 i2c_algo_bit drm_kms_helper psmouse ahci drm r8169 libahci mii video [last unloaded: ax88179_178a] [25507.383264] CPU: 4 PID: 13389 Comm: btrfs-transacti Tainted: P W OE 3.16.2-031602-generic #201409052035 [25507.383264] Hardware name: LENOVO 20221/INVALID, BIOS 71CN45WW(V1.18) 05/10/2013 [25507.383266] 0000000000000103 ffff88013941fc28 ffffffff8178824b 0000000000000007 [25507.383268] ffff88013941fc78 ffff88013941fc68 ffffffff8107207c ff0036013941fc98 [25507.383269] ffff8800af852800 ffff88039e8ee5a0 00000000fffffffb 0000000000000623 [25507.383271] Call Trace: [25507.383276] [] dump_stack+0x46/0x58 [25507.383279] [] warn_slowpath_common+0x8c/0xc0 [25507.383281] [] warn_slowpath_fmt+0x46/0x50 [25507.383288] [] __btrfs_abort_transaction+0x5f/0x130 [btrfs] [25507.383298] [] cleanup_transaction+0x6e/0x2d0 [btrfs] [25507.383301] [] ? __wake_up_sync+0x20/0x20 [25507.383303] [] ? __wake_up+0x53/0x70 [25507.383311] [] btrfs_commit_transaction.part.34+0x70a/0xa10 [btrfs] [25507.383319] [] ? btrfs_run_delayed_refs.part.81+0x230/0x290 [btrfs] [25507.383326] [] btrfs_commit_transaction+0x46/0x80 [btrfs] [25507.383334] [] transaction_kthread+0x1d5/0x250 [btrfs] [25507.383341] [] ? open_ctree+0x1f70/0x1f70 [btrfs] [25507.383343] [] kthread+0xc9/0xe0 [25507.383345] [] ? flush_kthread_worker+0xb0/0xb0 [25507.383348] [] ret_from_fork+0x7c/0xb0 [25507.383350] [] ? flush_kthread_worker+0xb0/0xb0 [25507.383351] ---[ end trace 046c154d782816fc ]--- [25507.383353] BTRFS: error (device dm-0) in cleanup_transaction:1571: errno=-5 IO failure [25507.383355] BTRFS info (device dm-0): delayed_refs has NO entry [25518.811775] net_ratelimit: 83 callbacks suppressed [25518.811783] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25518.811849] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25518.811881] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25518.812276] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25518.812296] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25518.812328] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25518.812333] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25518.812336] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25518.812340] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25518.812343] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25555.167642] net_ratelimit: 79635 callbacks suppressed [25555.167648] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25555.167671] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25555.167698] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25555.167703] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25555.167707] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25555.167711] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25555.167714] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25555.167717] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25555.167721] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25555.167724] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25567.387082] net_ratelimit: 2924 callbacks suppressed [25567.387089] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25567.387454] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25567.387639] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25567.387717] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25567.387721] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25567.387724] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25567.387727] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25567.387730] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25567.387733] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25567.387736] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25575.753391] net_ratelimit: 2 callbacks suppressed [25575.753401] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25575.753420] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25575.753450] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25575.753454] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25575.753459] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25575.753464] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25575.753468] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25575.753473] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25575.753476] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25575.753479] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25607.330550] net_ratelimit: 1557 callbacks suppressed [25607.330557] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25607.330611] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25607.330637] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25607.330641] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25607.330644] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25607.330648] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25607.330651] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25607.330657] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25607.330662] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25607.330665] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25612.573619] net_ratelimit: 22 callbacks suppressed [25612.573626] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25612.573645] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25612.573672] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25612.573676] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25612.573680] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25612.573684] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25612.573688] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25612.573691] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25612.573698] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25612.573705] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25619.664604] net_ratelimit: 1319 callbacks suppressed [25619.664611] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25619.664662] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25619.664689] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25619.664693] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25619.664697] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25619.664700] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25619.664704] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25619.664707] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25619.664711] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25619.664715] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25675.571656] net_ratelimit: 63 callbacks suppressed [25675.571665] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25675.571902] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25675.572692] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25675.572776] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25675.572781] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25675.572785] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25675.572788] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25675.572791] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25675.572793] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25675.572796] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25706.058551] net_ratelimit: 2 callbacks suppressed [25706.058558] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25706.058576] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25706.058604] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25706.058609] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25706.058612] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25706.058616] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25706.058619] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25706.058623] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25706.058625] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped [25706.058628] ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped The message in the form of `ax88179_178a 1-1.2:1.0 eth2: kevent 2 may have been dropped` only occurs irregularly, I've never seen messages related to the failure of the ax88179_178a driver or device. The behavior is the same with all combinations of Ubuntu mainline kernel versions 3.13.0-35, 3.15.10, 3.16.1 and 3.16.2 and ASIX driver versions 1.9.0 and 1.10.0 (installed explicitly with `make && sudo make install` from tarball from http://www.asix.com.tw/download.php?sub=driverdetail&PItemID=131.