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internal/trace: fix int overflow in timestamps

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Fixes #15102

Change-Id: I7fdb6464afd0b7af9b6652051416f0fddd34dc9a
Reviewed-on: https://go-review.googlesource.com/21730
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Dmitry Vyukov 2016-04-08 11:53:23 +02:00
parent b6cd6d7d32
commit 944a0859b9
2 changed files with 55 additions and 1 deletions
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4
src/internal/trace/parser.go
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@ -372,8 +372,10 @@ func parseEvents(ver int, rawEvents []rawEvent, strings map[uint64]string) (even
return
}
minTs := events[0].Ts
// Use floating point to avoid integer overflows.
freq := 1e9 / float64(ticksPerSec)
for _, ev := range events {
ev.Ts = (ev.Ts - minTs) * 1e9 / ticksPerSec
ev.Ts = int64(float64(ev.Ts-minTs) * freq)
// Move timers and syscalls to separate fake Ps.
if timerGoid != 0 && ev.G == timerGoid && ev.Type == EvGoUnblock {
ev.P = TimerP