I set up virtualbox client where I can reliably reproduce the issue, attached is sysrq output for w and t both are taken when mount is already stuck and usb device is still attached. I'll try the suggested patch in a little while and get back on that too. d. On 19 June 2012 21:11, Muthu Kumar <muthu.lkml@xxxxxxxxx> wrote: > i can try - no promise :) > > On Tue, Jun 19, 2012 at 7:45 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: >> On Tue, 19 Jun 2012, Dima Tisnek wrote: >> >>> I made a microsd flash with 2 partitions, sdb1 is data partition, and >>> sdb2 is a sentinel partition, 1 block in size. >>> >>> I attached the usb-microsd reader with that card in it and by mistake >>> tried to mount the sentinel partition, I ran: >>> mount /dev/sdb2 /mnt/flash/ >>> >>> mount got stuck, I was not able to kill or strace it, > > Could you enable magic sysrq and get the output of "echo t > > /proc/sysrq-trigger" when this happens - please don't remove the > device. > > I pulled the usb >>> reader from the port, mount was still stuck, here's the dmesg log: > > This may be a bit old since the problem happened before removing the device. > > Thanks, > Muthu
Attachment:
sysrq.w
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sysrq.t
Description: Troff document
