Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Lars Ellenberg wrote: > > On Mon, Jan 30, 2012 at 02:56:57PM -0600, Ronald Wells wrote: > >>Only that 8.4.0 is much more seriously broken than 8.4.1 :-/ > > I was afraid of that.. I am planning to go back to 8.3 branch, but wanted > to post this in hopes it would help fix a bug. > > >>I suggest you retry and configure >> "no-disk-barriers; no-disk-flushes; no-md-flushes;" >>for at least the stacked resource, >>that may help working around this issue. > > If doing that would help debug the prob I'm happy to, I'm assuming that > would not be recommended for a production system? > >> Jan 27 16:22:43 drbd kernel: [ 191.128580] Call Trace: > >>> Jan 27 16:22:43 drbd kernel: [ 191.128602] [<ffffffffa02882fc>] ? >>> drbd_make_request+0x2b/0x14b [drbd] >>> Jan 27 16:22:43 drbd kernel: [ 191.128605] [<ffffffff81180eeb>] ? >>> bio_end_empty_barrier+0x0/0x24 > >>This does not compute. > >>Why would bio_end_empty_barrier() call drbd_make_request? >>Or, why would bio_end_empty_barrier() call anything at all? >>That's an atomic bio completion function that set at most two bits, >>and does one completion. > >>It can not possibly wait for anything (but the spinlock of the >>completion; which would not be reported as "soft lockup", but as a >>spinlock deadlock). > >>The call path actually should be >> bm_rw -> blkdev_issue_flush -> submit_bio -> generic_make_request -> >>drbd_make_request -> bio_endio(, -EOPNOTSUPP), which ends up in >>bio_end_empty_barrier(), which, as indicated above, should be atomic. > >>Configuring DRBD with no-md-flushes etc. as indicated above would >>not even try to call blkdev_issue_flush, thus skipping this completely. > > Good question. Would it be helpful for me to try that and post the > results, or not since it appears to be a bug? Are there additional logs > or anything else that would be helpful in trying to debug this? > > > -- View this message in context: http://old.nabble.com/DRBD-8.4.1-fails-to-bring-up-stacked-resource-on-debian-2.6.32-5-amd64-tp33234353p33237674.html Sent from the DRBD - User mailing list archive at Nabble.com.