Glen Barber
2015-Mar-12 05:18 UTC
HEADS-UP: system deadlock issues when rebooting after updating or upgrading to 10.1-RELEASE
It has become apparent that issues reported in PR 195458 [1] do not apply to freebsd-update(8) users alone, and that the deadlock on reboot (either via reboot(8) or shutdown(8) with the '-r' flag) can be reliably reproduced under certain conditions. Specifically, the issue can be reliably reproduced on systems using UFS as the root filesystem with soft-updates and journaling enabled (a.k.a., SU+J). Systems using ZFS or UFS without SU+J appear to be unaffected at this point (noted by various people in the referenced PR, as well as my own tests). Based on the comments in the referenced PR, it is unclear if this deadlock can occur under other conditions, but it seems to be contained to UFS with SU+J. If you have experienced a deadlock after upgrading a 10.1-RELEASE system, please update the referenced PR with pertinent information (filesystem, and filesystem options, etc.). While the underlying cause, and more importantly, a resolution is being investigated, it is critical we have as much information as possible. Once the underlying issue is identified, and we have a tested fix for the problem, an EN will be issued as soon as reasonably possible. To be clear, this issue manifests as an unresponsive system after issuing a reboot(8) (or in some cases, a shutdown(8)) command, after the "All buffers synced." message is displayed, and this heads-up is addressing only those cases (or potential cases). All other filesystem related should be reported in a separate PR, as usual. Having said all of the above, I as the RE for 10.1-RELEASE, personally apologize to everyone that has run into this issue. I am still baffled why I did not run into this problem when testing 10.1-RELEASE (or any of the -BETA or -RC builds). I can only attribute this to a change in my testing environment (i.e., updated hypervisor software), but given the details and reproducibility after recent testing, am unable to explain how this was not discovered earlier. [1] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195458 Glen On behalf of: re@ -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 819 bytes Desc: not available URL: <http://lists.freebsd.org/pipermail/freebsd-stable/attachments/20150312/58e763d1/attachment.sig>