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taildrop: fix theoretical race condition (#9866) 

WaitGroup.Wait should not be concurrently called WaitGroup.Add.
In other words, we should not start new goroutines after shutodwn is called.
Thus, add a conditional to check that shutdown has not been called
before starting off a new waitAndDelete goroutine.

Updates tailscale/corp#14772

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
This commit is contained in:
Joe Tsai 2023-10-18 10:21:36 -07:00 committed by GitHub
parent 756a4c43b6
commit a8fbe284b2
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 2 additions and 2 deletions
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4
taildrop/delete.go
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@ -94,7 +94,7 @@ func (d *fileDeleter) Insert(baseName string) {
return // already queued for deletion
}
d.byName[baseName] = d.queue.PushBack(&deleteFile{baseName, d.clock.Now()})
if d.queue.Len() == 1 {
if d.queue.Len() == 1 && d.shutdownCtx.Err() == nil {
d.group.Go(func() { d.waitAndDelete(deleteDelay) })
}
}
@ -147,7 +147,7 @@ func (d *fileDeleter) waitAndDelete(wait time.Duration) {
}
// If there are still some files to delete, retry again later.
if d.queue.Len() > 0 {
if d.queue.Len() > 0 && d.shutdownCtx.Err() == nil {
file := d.queue.Front().Value.(*deleteFile)
retryAfter := deleteDelay - now.Sub(file.inserted)
d.group.Go(func() { d.waitAndDelete(retryAfter) })