Livepatch 2021-03-24 incident investigation report
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Description A defective livepatch for kernel 4.4 in Ubuntu 16.04 LTS (Xenial) was not caught in internal testing processes because the defect was a race condition, triggered by workload-specific behaviour, under load. The livepatch would cause the madvise system call to block indefinitely, and thus cause lockup to the processes using the call. These conditions […]
https://ubuntu.com//blog/livepatch-2021-03-24-incident-investigation-report
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