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virtiofs: virtiofs mount inside guest hangs if virtiofsd quits #2315
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eryugey
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Dec 4, 2019
Commit 89e0dfa ("qemu: stop qemu process when virtiofsd quits") stops sandbox when virtiofsd quits so that virtiofs mount inside guest won't hang. But commit d5a3d0a ("virtiofs: use virtiofsd --fd=FDNUM") deleted this monitor logic. Add the Scanner back to monitor virtiofsd's stderr and stop sandbox if Scanner returns error. Note that we don't monitor the virtiofsd process itself is because virtiofsd may be live-upgraded (when available) and the original process may quit, but virtiofs service is still running. Fixes: kata-containers#2315 Signed-off-by: Eryu Guan <[email protected]>
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Description of problem
If virtiofsd was dead, the virtiofs mount inside guest hangs.
Commit 89e0dfa ("qemu: stop qemu process when virtiofsd quits") fixed it once. But commit d5a3d0a ("virtiofs: use virtiofsd --fd=FDNUM") broke it.
Expected result
sandbox is stopped as well.
Actual result
virtiofs mount hangs inside guest.
Additional info
I'll send a PR to fix this issue
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