Hi Jens, Thanks for the quick reply. I just built 82a78cd and I'm seeing the same problem as reported. Logan On 08/11/16 11:21 AM, Jens Axboe wrote: > On 11/08/2016 11:16 AM, Logan Gunthorpe wrote: >> Hi guys, >> >> We were looking at testing the new IO polling improvements and we built >> a kernel from the 'for-4.10/dio' (64ead7d) branch in linux-block. >> However this branch seems to cause hung tasks when booted. Most >> noticeably, dhclient seems to always hang as it tries to read from it's >> leases file, and that means networking does not work on the computers we >> tested on. Other tasks seemed to hang occasionally and randomly. >> >> We tested on two machines with radically different hardware but both >> running Debian Jessie. (One is a dual-socket server system with the >> root FS on an HDD and the other is an off the shelf commodity >> motherboard with root on an SSD.) >> >> We performed a bisect to find the culprit commit to be: >> >> [b685d3d65ac791406e0dfd8779cc9b3707fea5a3] block: treat REQ_FUA and >> REQ_PREFLUSH as synchronous >> >> I've attached a bisect log. > > I don't think that's right. The version you ran has a bug in the stats > code. Please update to the current for-4.10/dio branch (82a78cd682bf) > and I think you'll have more luck. > -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
