After removing 8-libceph-protect-ceph_con_open-with-mutex.patch, it seems we no longer have this hang. On Thu, Nov 8, 2012 at 5:43 PM, Josh Durgin <josh.durgin@xxxxxxxxxxx> wrote: > On 11/08/2012 02:10 PM, Mandell Degerness wrote: >> >> We are seeing a somewhat random, but frequent hang on our systems >> during startup. The hang happens at the point where an "rbd map >> <rbdvol>" command is run. >> >> I've attached the ceph logs from the cluster. The map command happens >> at Nov 8 18:41:09 on server 172.18.0.15. The process which hung can >> be seen in the log as 172.18.0.15:0/1143980479. >> >> It appears as if the TCP socket is opened to the OSD, but then times >> out 15 minutes later, the process gets data when the socket is closed >> on the client server and it retries. >> >> Please help. >> >> We are using ceph version 0.48.2argonaut >> (commit:3e02b2fad88c2a95d9c0c86878f10d1beb780bfe). >> >> We are using a 3.5.7 kernel with the following list of patches applied: >> >> 1-libceph-encapsulate-out-message-data-setup.patch >> 2-libceph-dont-mark-footer-complete-before-it-is.patch >> 3-libceph-move-init-of-bio_iter.patch >> 4-libceph-dont-use-bio_iter-as-a-flag.patch >> 5-libceph-resubmit-linger-ops-when-pg-mapping-changes.patch >> 6-libceph-re-initialize-bio_iter-on-start-of-message-receive.patch >> 7-ceph-close-old-con-before-reopening-on-mds-reconnect.patch >> 8-libceph-protect-ceph_con_open-with-mutex.patch >> 9-libceph-reset-connection-retry-on-successfully-negotiation.patch >> 10-rbd-only-reset-capacity-when-pointing-to-head.patch >> 11-rbd-set-image-size-when-header-is-updated.patch >> 12-libceph-fix-crypto-key-null-deref-memory-leak.patch >> 13-ceph-tolerate-and-warn-on-extraneous-dentry-from-mds.patch >> 14-ceph-avoid-divide-by-zero-in-__validate_layout.patch >> 15-rbd-drop-dev-reference-on-error-in-rbd_open.patch >> 16-ceph-Fix-oops-when-handling-mdsmap-that-decreases-max_mds.patch >> 17-libceph-check-for-invalid-mapping.patch >> 18-ceph-propagate-layout-error-on-osd-request-creation.patch >> 19-rbd-BUG-on-invalid-layout.patch >> 20-ceph-return-EIO-on-invalid-layout-on-GET_DATALOC-ioctl.patch >> 21-ceph-avoid-32-bit-page-index-overflow.patch >> 23-ceph-fix-dentry-reference-leak-in-encode_fh.patch >> >> Any suggestions? > > > The log shows your monitors don't have time sychronized enough among > them to make much progress (including authenticating new connections). > That's probably the real issue. 0.2s is pretty large clock drift. > > >> One thought is that the following patch (which we could not apply) is >> what is required: >> >> 22-rbd-reset-BACKOFF-if-unable-to-re-queue.patch > > > This is certainly useful too, but I don't think it's the cause of > the delay in this case. > > Josh > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
