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41 lines
1.3 KiB
41 lines
1.3 KiB
package hcs
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import (
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"context"
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"github.com/Microsoft/hcsshim/internal/logfields"
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"github.com/Microsoft/hcsshim/internal/timeout"
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"github.com/sirupsen/logrus"
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)
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// syscallWatcher is used as a very simple goroutine around calls into
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// the platform. In some cases, we have seen HCS APIs not returning due to
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// various bugs, and the goroutine making the syscall ends up not returning,
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// prior to its async callback. By spinning up a syscallWatcher, it allows
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// us to at least log a warning if a syscall doesn't complete in a reasonable
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// amount of time.
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//
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// Usage is:
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//
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// syscallWatcher(logContext, func() {
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// err = <syscall>(args...)
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// })
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//
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func syscallWatcher(logContext logrus.Fields, syscallLambda func()) {
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ctx, cancel := context.WithTimeout(context.Background(), timeout.SyscallWatcher)
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defer cancel()
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go watchFunc(ctx, logContext)
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syscallLambda()
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}
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func watchFunc(ctx context.Context, logContext logrus.Fields) {
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select {
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case <-ctx.Done():
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if ctx.Err() != context.Canceled {
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logrus.WithFields(logContext).
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WithField(logfields.Timeout, timeout.SyscallWatcher).
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Warning("Syscall did not complete within operation timeout. This may indicate a platform issue. If it appears to be making no forward progress, obtain the stacks and see if there is a syscall stuck in the platform API for a significant length of time.")
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}
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}
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}
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