https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196086
Bug ID: 196086
Summary: [geom] a race in gmirror cause kernel crash during
startup
Product: Base System
Version: 9.3-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: alexandre.mart...@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
event G_MIRROR_DISK_STATE_NEW.
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