On 04/07/2014 12:05 PM, Marc MERLIN wrote:
I was debugging my why backup failed to run, and eventually found it was stuck on sync: 14080 18:18 btrfs_tree_read_lock sync This was hung for hours on this lock. Strangely, it looks like taking my sysrq-w hung the machine pretty hard for close to 30sec, but this seems to have unhung sync and in the end btrfs send completed after that. Sysqrq-w is here: https://urldefense.proofpoint.com/v1/url?u=http://marc.merlins.org/tmp/sysrq-btrfs-sync-hang.txt&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=cKCbChRKsMpTX8ybrSkonQ%3D%3D%0A&m=IHXWC1Chbc0jEiUWu1v4Va9NOphtjPbjYp6yVMdUmXM%3D%0A&s=bd787a3422e9ff0972d2d09de7d424f56589aadc9d6db33e19fc44886dce604f
Try Chris's integration branch in a few hours and see if that fixes it. Thanks,
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