[Bug 196086] New: [geom] a race in gmirror cause kernel crash during startup

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Thu Dec 18 08:52:11 UTC 2014


            Bug ID: 196086
           Summary: [geom] a race in gmirror cause kernel crash during
           Product: Base System
           Version: 9.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: alexandre.martins at netasq.com

In the function g_mirror_add_disk, the event "G_MIRROR_DISK_STATE_NEW" is sent
before the call to g_mirror_update_metadata.

However, if the event finishes before the call to g_mirror_update_metadata,
with the result that the disk is destroy, the "disk" pointer is now invalid and
may cause a kernel crash.

In my case, the disk was invalid because its syncid was not updated ("Component
ada1 (device gm0) broken, skipping." in function g_mirror_update_device)

The solution may be to call g_mirror_update_metadata before the launch of the

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