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net/tstun: diagnose /dev/net/tun fd leak, give better failure message

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Updates #5029

Change-Id: Ibee5e0c9076fe764eb5d856d5ef8b09f4d0e2921
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-07-16 14:10:20 -07:00
committed by Brad Fitzpatrick
parent 931f18b575
commit 0d52674a84
4 changed files with 17 additions and 6 deletions
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2
cmd/tailscaled/tailscaled.go
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@@ -515,7 +515,7 @@ func tryEngine(logf logger.Logf, linkMon *monitor.Mon, dialer *tsdial.Dialer, na
} else {
dev, devName, err := tstun.New(logf, name)
if err != nil {
tstun.Diagnose(logf, name)
tstun.Diagnose(logf, name, err)
return nil, false, fmt.Errorf("tstun.New(%q): %w", name, err)
}
conf.Tun = dev