** Changed in: linux-azure (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1927438
Title:
Commits To Fix Kdump Failures
Status in linux-azure package in Ubuntu:
Fix Released
Bug description:
Microsoft received a customer report of failures when trying to take a
kdump. This issue was resolved by three small Linux kernel fixes.
Microsoft would like to request this following three commits in all
supported releases:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/video/fbdev/hyperv_fb.c?id=aa5b7d11c7cb87c266d705b237368985e7171958
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/hv/channel_mgmt.c?id=77db0ec8b7764cb9b09b78066ebfd47b2c0c1909
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/hv/channel_mgmt.c?id=8c2d5e0640e53c14b6240e9bf1e32a2226e6e6ca
Patch #1 solves a problem where the “Unable to send packet via vmbus”
message is output continuously. But with that problem fixed, the
second problem can occur where the kdump kernel panics due to
receiving an unexpected VMbus UNLOAD complete message.
Patch #2 prevents the UNLOAD complete message from ever occurring in
the kdump kernel. But if the UNLOAD complete message does occur at
some unexpected time, Patch #3 prevents it from causing a panic.
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