Hi, My laptop is HP Envy4-1220tx with Intel HM77 chipset, and I'm using Arch Linux with kernel 3.17.1-1-ARCH. When I connect an external HD to my laptop, system freezes after 30 sec. Not certain whether the bug is related to kernel or udev. kernel log as follows: Oct 30 12:48:42 kernel: usb 4-1: new SuperSpeed USB device number 2 using xhci_hcd Oct 30 12:48:42 kernel: usbcore: registered new interface driver usb-storage Oct 30 12:48:42 kernel: scsi host6: uas Oct 30 12:48:42 kernel: usbcore: registered new interface driver uas Oct 30 12:48:42 kernel: scsi 6:0:0:0: Direct-Access HGST HTS 545050A7E380 0100 PQ: 0 ANSI: 6 Oct 30 12:48:42 kernel: sd 6:0:0:0: [sdc] 976773168 512-byte logical blocks: (500 GB/465 GiB) Oct 30 12:48:42 kernel: sd 6:0:0:0: [sdc] 4096-byte physical blocks Oct 30 12:48:42 kernel: sd 6:0:0:0: [sdc] Write Protect is off Oct 30 12:48:42 kernel: sd 6:0:0:0: [sdc] Mode Sense: 67 00 10 08 Oct 30 12:48:42 kernel: sd 6:0:0:0: [sdc] Write cache: enabled, read cache: enabled, supports DPO and FUA Oct 30 12:49:12 systemd-udevd[188]: worker [457] /devices/pci0000:00/0000:00:14.0/usb4/4-1/4-1:1.0 timeout; kill it Oct 30 12:49:12 systemd-udevd[188]: seq 2003 '/devices/pci0000:00/0000:00:14.0/usb4/4-1/4-1:1.0' killed Oct 30 12:49:12 systemd-journal[179]: Suppressed 157 messages from / Oct 30 12:49:12 systemd[1]: Got notification message for unit systemd-journald.service Oct 30 12:49:12 systemd[1]: systemd-journald.service: Got notification message from PID 179 (WATCHDOG=1...) Oct 30 12:49:12 systemd[1]: systemd-journald.service: got WATCHDOG=1 Oct 30 12:49:12 systemd[1]: Got notification message for unit systemd-journald.service Oct 30 12:49:12 systemd[1]: systemd-journald.service: Got notification message from PID 179 (WATCHDOG=1...) Oct 30 12:49:12 systemd[1]: systemd-journald.service: got WATCHDOG=1 Oct 30 12:49:13 kernel: sd 6:0:0:0: uas_eh_abort_handler ffff88008dcf3c80 tag 0, inflight: IN Oct 30 12:49:13 kernel: BUG: unable to handle kernel NULL pointer dereference at 00000000000000f0 Oct 30 12:49:13 kernel: IP: [<ffffffff8153bd27>] _raw_spin_lock_irqsave+0x27/0x70 Kernel log ends here and system freezes, no stack trace. The external HD works normal in Windows. Any help? -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
