> Does the Samsung 840 EVO SSD support UAS (USB attached SCSI?) i.e. does > it use the uas driver instead of mass-storage? I don't think UAS is an issue here: I tried disabling it for the SSD using a quirk (ie with the line "options usb_storage quirks=174c:1053:u" in the file /etc/modprobe.d/usb_storage.conf) and the kernel still locked up. > Could you take full logs from boot with xhci debugging and tracing both enabled? See attached. The SSD is /dev/sda and /media/cat is where it tries to mount /dev/sda1, and there's a NULL dereference at 32.736157 that might be the cause of the lockup. On Tue, Jun 20, 2017 at 6:17 PM, Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> wrote: > On 20.06.2017 12:47, rocko r wrote: >> >> Whenever I boot my laptop and log into the desktop with a USB-C to >> USB-3 hub attached and a Samsung 840 EVO SSD attached to the USB-C >> hub, the laptop locks up completely for kernel versions 4.12-rc1 >> through 4.12-rc6. Kernels 4.10 and 4.11 do not crash, so this is a >> regression. >> >> The lock-up occurs shortly after logging into the desktop. Note that >> when I am presented with the lightdm login screen, my mouse attached >> via the USB-C to USB-3 hub works, but it stops working after the >> desktop first appears, as if the USB-C hub has gone offline, and then >> it starts working again maybe five to ten seconds later (this also >> happens in kernel 4.11, but 4.11 successfully mounts the SSD and does >> not lock up). >> >> Shortly after this in kernels 4.12-rcX, the SSD fails to mount and at >> some point after this, syslog shows soft lockup errors. Eventually the >> entire laptop locks up and has to be hard-reset. When I tried 4.12-rc6 >> today, the laptop locked up almost immediately and did not store a >> message in syslog. >> >> This bug happens every time when rebooting and then logging into the >> desktop with that particular configuration, ie SSD attached via the >> USB-C to USB-3 hub. If I have the USB-C to USB-3 hub attached and the >> SSD attached via one of the laptop's USB-3 ports, the laptop does not >> lock up. If I plug in the SSD to the USB-C hub after booting into the >> desktop, the laptop does not lock up. >> >> Attached is a log of the soft lockup BUG message from 4.12-rc5 and >> also another NULL dereference error I noticed today that might be >> related. >> > > The type-c port is controller by a separate hotpluggable PCI xHCI > controller, > > Looks like that controller disappears for a while, and driver tries to cope > with it but hangs while freeing streams. > > Does the Samsung 840 EVO SSD support UAS (USB attached SCSI?) i.e. does > it use the uas driver instead of mass-storage? > > Could you take full logs from boot with xhci debugging and tracing both > enabled? > > add xhci_hcd.dyndbg=+p or module xhci_hcd +p to kernel cmdline for xhci > debugging, > and trace_event=xhci-hcd trace_buf_size=10M for tracing > > Thanks > Mathias >
Attachment:
xhcd and events.log.xz
Description: application/xz
