On 07/25/2017 02:51 AM, Jan Kara wrote: > Hello, > > On Sun 25-06-17 23:07:56, Alex Xu wrote: >> I get hangs when resuming when using bfq-mq with ext4 on 4.12-rc6+ >> (currently a4fd8b3accf43d407472e34403d4b0a4df5c0e71). >> >> Steps to reproduce: >> 1. boot computer >> 2. systemctl suspend >> 3. wait few seconds >> 4. press power button >> 5. type "ls" into console or SSH or do anything that does disk IO >> >> Expected results: >> Command is executed. >> >> Actual results: >> Command hangs. >> >> lockdep has no comments, but sysrq-d shows that i_mutex_dir_key and >> jbd2_handle are held by multiple processes, leading me to suspect that >> ext4 is at least partially involved. [0] > > Can you still reproduce this? Can you try with this patch added: http://git.kernel.dk/cgit/linux-block/commit/?h=for-linus&id=765e40b675a9566459ddcb8358ad16f3b8344bbe -- Jens Axboe
