On Wed, Jul 05, 2017 at 08:57:54AM +0100, Chris Clayton wrote: > Thanks for the reply, Johannes. > The strace log for 4.12.0 is attached. Thanks Chris. Can I have a known good version as well? The counterpart to this snippet would be great: open("/dev/sg0", O_RDWR) = 6 ioctl(6, SG_SET_RESERVED_SIZE, [131072]) = 0 ioctl(6, SG_SET_TIMEOUT, [10800000]) = 0 write(6, "\0\0\0\0H\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 42) = -1 EINVAL (Invalid argument) -- Johannes Thumshirn Storage jthumshirn@xxxxxxx +49 911 74053 689 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg) Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850