From 922a239079aefb78a05f1234f8883d8096f46c62 Mon Sep 17 00:00:00 2001 From: mrsdizzie Date: Tue, 28 Apr 2020 11:45:32 -0400 Subject: [PATCH] Disable new signal-based asynchronous goroutine preemption from GO 1.14 in git env (#11237) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit As seen in trouble shooting #11032 the new feature of Go 1.14 is causing several second delays in startup in certain situations. Debugging shows it spending several seconds handling SIGURG commands during init: ``` 6922:04:51.984234 trace init() ./modules/queue/unique_queue_wrapped.go remote: ) = 69 <0.000012> remote: [pid 15984] 22:04:51 write(1, "\ttime taken: 236.761\302\265s\n\n", 25 time taken: 236.761µs remote: remote: ) = 25 <0.000011> remote: [pid 15984] 22:04:51 --- SIGURG {si_signo=SIGURG, si_code=SI_TKILL, si_pid=15984, si_uid=0} --- remote: [pid 15984] 22:04:52 --- SIGURG {si_signo=SIGURG, si_code=SI_TKILL, si_pid=15984, si_uid=0} --- remote: [pid 15984] 22:04:52 --- SIGURG {si_signo=SIGURG, si_code=SI_TKILL, si_pid=15984, si_uid=0} --- ``` This causes up to 20 seconds added to a push in some cases as it happens for each call of the gitea hook command. This is likely the cause of #10661 as well and would start to effect users once we release 1.12 which would be the first release compiled with Go 1.14. I suspect this is just a slight issue with the upstream implementatation as there have been a few very similar bugs fixed and reported: https://github.com/golang/go/issues/37741 https://github.com/golang/go/issues/37942 We should revisit this in the future and see if a newer version of Go has solved it, but for now disable this option in the environment that gitea hook runs in to avoid it. --- modules/git/command.go | 2 ++ 1 file changed, 2 insertions(+) diff --git a/modules/git/command.go b/modules/git/command.go index c1f386073..53a04f64b 100644 --- a/modules/git/command.go +++ b/modules/git/command.go @@ -119,6 +119,8 @@ func (c *Command) RunInDirTimeoutEnvFullPipelineFunc(env []string, timeout time. cmd.Env = env cmd.Env = append(cmd.Env, fmt.Sprintf("LC_ALL=%s", DefaultLocale)) } + + cmd.Env = append(cmd.Env, "GODEBUG=asyncpreemptoff=1") cmd.Dir = dir cmd.Stdout = stdout cmd.Stderr = stderr