dmesg tail: [256283.199505] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.199510] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.222835] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.222841] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.246169] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.246176] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.269499] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.269504] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.292831] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.292837] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.316162] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.316168] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.339493] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.339499] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.362827] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.362832] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.386170] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.386177] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.409492] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.409498] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.432821] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.432826] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.456152] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.456158] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.479484] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.479490] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.502816] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.502822] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.526149] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.526157] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.549480] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.549487] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.572813] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.572819] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [256283.596153] ohci-pci 0000:00:13.1: OHCI SF watchdog triggered [256283.596163] ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 grep'ping /var/log/messages for "ohci" which might provide some context over the past few days, involving my laptop going to standby a few times each day, and waking back up. I notice a strange pattern about 9 minutes before the crash, after I came back from a standby, involving 4 resets of device number 14, and then 5 "new full-speed" devices: Apr 21 15:26:19 kernel: ohci-pci 0000:00:13.1: System wakeup enabled by ACPI Apr 21 15:26:19 kernel: ohci-pci 0000:00:13.0: System wakeup enabled by ACPI Apr 21 15:26:19 kernel: ohci-pci 0000:00:13.0: System wakeup disabled by ACPI Apr 21 15:26:19 kernel: ohci-pci 0000:00:13.1: System wakeup disabled by ACPI Apr 21 18:06:56 kernel: ohci-pci 0000:00:13.1: System wakeup enabled by ACPI Apr 21 18:06:56 kernel: ohci-pci 0000:00:13.0: System wakeup enabled by ACPI Apr 21 18:06:56 kernel: ohci-pci 0000:00:13.0: System wakeup disabled by ACPI Apr 21 18:06:56 kernel: ohci-pci 0000:00:13.1: System wakeup disabled by ACPI Apr 21 21:13:38 kernel: usb 3-4: new low-speed USB device number 10 using ohci-pci Apr 22 07:09:57 kernel: ohci-pci 0000:00:13.1: System wakeup enabled by ACPI Apr 22 07:09:57 kernel: ohci-pci 0000:00:13.0: System wakeup enabled by ACPI Apr 22 07:09:57 kernel: ohci-pci 0000:00:13.0: System wakeup disabled by ACPI Apr 22 07:09:57 kernel: ohci-pci 0000:00:13.1: System wakeup disabled by ACPI Apr 22 07:10:36 kernel: usb 3-3: new full-speed USB device number 11 using ohci-pci Apr 22 10:18:02 kernel: usb 3-4: new full-speed USB device number 12 using ohci-pci Apr 23 06:56:54 kernel: ohci-pci 0000:00:13.1: System wakeup enabled by ACPI Apr 23 06:56:54 kernel: ohci-pci 0000:00:13.0: System wakeup enabled by ACPI Apr 23 06:56:54 kernel: ohci-pci 0000:00:13.0: System wakeup disabled by ACPI Apr 23 06:56:54 kernel: ohci-pci 0000:00:13.1: System wakeup disabled by ACPI Apr 23 06:58:50 kernel: usb 3-3: new full-speed USB device number 13 using ohci-pci Apr 23 14:35:54 kernel: ohci-pci 0000:00:13.1: System wakeup enabled by ACPI Apr 23 14:35:54 kernel: ohci-pci 0000:00:13.0: System wakeup enabled by ACPI Apr 23 14:35:54 kernel: ohci-pci 0000:00:13.0: System wakeup disabled by ACPI Apr 23 14:35:54 kernel: ohci-pci 0000:00:13.1: System wakeup disabled by ACPI Apr 24 07:20:48 kernel: ohci-pci 0000:00:13.1: System wakeup enabled by ACPI Apr 24 07:20:48 kernel: ohci-pci 0000:00:13.0: System wakeup enabled by ACPI Apr 24 07:20:48 kernel: ohci-pci 0000:00:13.0: System wakeup disabled by ACPI Apr 24 07:20:48 kernel: ohci-pci 0000:00:13.1: System wakeup disabled by ACPI Apr 24 07:21:14 kernel: usb 3-3: new full-speed USB device number 14 using ohci-pci Apr 24 15:50:05 kernel: ohci-pci 0000:00:13.1: System wakeup enabled by ACPI Apr 24 15:50:05 kernel: ohci-pci 0000:00:13.0: System wakeup enabled by ACPI Apr 24 15:50:05 kernel: ohci-pci 0000:00:13.0: System wakeup disabled by ACPI Apr 24 15:50:05 kernel: ohci-pci 0000:00:13.1: System wakeup disabled by ACPI Apr 24 15:50:05 kernel: usb 3-3: reset full-speed USB device number 14 using ohci-pci Apr 24 15:50:05 kernel: usb 3-3: reset full-speed USB device number 14 using ohci-pci Apr 24 15:50:05 kernel: usb 3-3: reset full-speed USB device number 14 using ohci-pci Apr 24 15:50:05 kernel: usb 3-3: reset full-speed USB device number 14 using ohci-pci Apr 24 15:50:05 kernel: usb 3-3: new full-speed USB device number 15 using ohci-pci Apr 24 15:50:06 kernel: usb 3-3: new full-speed USB device number 16 using ohci-pci Apr 24 15:50:07 kernel: usb 3-3: new full-speed USB device number 17 using ohci-pci Apr 24 15:50:07 kernel: usb 3-3: new full-speed USB device number 18 using ohci-pci Apr 24 15:50:15 kernel: usb 3-3: new full-speed USB device number 19 using ohci-pci Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:23 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:24 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:24 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:24 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:24 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 15:59:24 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 15:59:24 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 [...] Apr 24 16:01:19 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:19 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: OHCI SF watchdog triggered Apr 24 16:01:20 kernel: ohci-pci 0000:00:13.1: Frame counter has stopped at 6263 cat'ing stuff in /sys/kernel/debug/usb/ohci, where hcca frame is stuck at 0x1877 (decimal 6263). the only thing that's changing over time are the two values in the "fmremaining" and "FRT FR" line: ==> async <== ==> periodic <== size = 32 0 [ 22]: ed1/ffff88004c0910a0 (fs dev19 ep1in-int qlen 1 max 16 00101093) 1 [ 22]: ed1/ffff88004c0910a0 2 [ 22]: ed1/ffff88004c0910a0 3 [ 22]: ed1/ffff88004c0910a0 4 [ 22]: ed1/ffff88004c0910a0 5 [ 22]: ed1/ffff88004c0910a0 6 [ 22]: ed1/ffff88004c0910a0 7 [ 22]: ed1/ffff88004c0910a0 8 [ 22]: ed1/ffff88004c0910a0 9 [ 22]: ed1/ffff88004c0910a0 10 [ 22]: ed1/ffff88004c0910a0 11 [ 22]: ed1/ffff88004c0910a0 12 [ 22]: ed1/ffff88004c0910a0 13 [ 22]: ed1/ffff88004c0910a0 14 [ 22]: ed1/ffff88004c0910a0 15 [ 22]: ed1/ffff88004c0910a0 16 [ 22]: ed1/ffff88004c0910a0 17 [ 22]: ed1/ffff88004c0910a0 18 [ 22]: ed1/ffff88004c0910a0 19 [ 22]: ed1/ffff88004c0910a0 20 [ 22]: ed1/ffff88004c0910a0 21 [ 22]: ed1/ffff88004c0910a0 22 [ 22]: ed1/ffff88004c0910a0 23 [ 22]: ed1/ffff88004c0910a0 24 [ 22]: ed1/ffff88004c0910a0 25 [ 22]: ed1/ffff88004c0910a0 26 [ 22]: ed1/ffff88004c0910a0 27 [ 22]: ed1/ffff88004c0910a0 28 [ 22]: ed1/ffff88004c0910a0 29 [ 22]: ed1/ffff88004c0910a0 30 [ 22]: ed1/ffff88004c0910a0 31 [ 22]: ed1/ffff88004c0910a0 ==> registers <== bus pci, device 0000:00:13.1 OHCI PCI host controller ohci_hcd OHCI 1.0, NO legacy support registers, rh state running control 0x28f RWC HCFS=operational IE PLE CBSR=3 cmdstatus 0x30002 SOC=3 CLF intrstatus 0x00000021 FNO SO intrenable 0x8000005e MIE RHSC UE RD SF WDH ed_periodcurrent 4c091140 ed_controlhead 4c091050 donehead 462dfb40 hcca frame 0x1877 fmintvl 0xa7782edf FIT FSMPS=0xa778 FI=0x2edf fmremaining 0x80001924 FRT FR=0x1924 periodicstart 0x2a2f lsthresh 0x0628 hub poll timer off roothub.a 02000204 POTPGT=2 NPS NDP=4(4) roothub.b 00000000 PPCM=0000 DR=0000 roothub.status 00008000 DRWE roothub.portstatus [0] 0x00000100 PPS roothub.portstatus [1] 0x00000100 PPS roothub.portstatus [2] 0x00000100 PPS roothub.portstatus [3] 0x00000100 PPS