It seems my global variables are being accessed concurrently by goroutines and it is causing race condition.
On Tuesday, June 27, 2017 at 3:05:03 PM UTC+5:30, Dave Cheney wrote: > > You have at least one data race in your program. > > https://golang.org/doc/go1.6#runtime > https://blog.golang.org/race-detector > https://golang.org/doc/articles/race_detector.html > > Looking at the panic message it looks like your findSupplierOrBuyer method > is updating a map that is part of a User's Dashboard. As the parent method > is called GetDashboard it is possible that you are sharing the same > Dashboard value between mutliple goroutines. > > Have a read of the links above, and start running your tests under the > race detector; go test -race. > > On Tuesday, 27 June 2017 19:25:57 UTC+10, Nupur Bansal wrote: >> >> Top part says: >> >> fatal error: concurrent map writes >> >> goroutine 23673 [running]: >> runtime.throw(0x95fc7f, 0x15) >> /usr/lib/go/src/runtime/panic.go:566 +0x95 fp=0xc420482708 >> sp=0xc4204826e8 >> runtime.mapassign1(0x8cb4c0, 0xc4200e8e10, 0xc420482a88, 0xc420482a68) >> /usr/lib/go/src/runtime/hashmap.go:553 +0x2e1 fp=0xc4204827f0 >> sp=0xc420482708 >> wservce/models.findSupplierOrBuyer(0xc42038812e, 0x6, 0x0, 0x0, >> 0xc42073e270, 0xf, 0xc420388123, 0x2, 0xba9ac0, 0xc42051c800, ...) >> /home/nupur/golang/code/src/wservce/models/userDashboard.go:153 >> +0xc07 fp=0xc420482e80 sp=0xc4204827f0 >> wservce/models.(*UserDashboard).GetDashboardDetails(0xc4203622a0, >> 0xba9ac0, 0xc42051c800, 0xc42073e270, 0xf, 0x1, 0x125) >> /home/nupur/golang/code/src/wservce/models/userDashboard.go:75 +0x14d >> fp=0xc420483040 sp=0xc420482e80 >> wservce/controllers.Request.Dashboard(0xba9ac0, 0xc42051c800, >> 0xc42073e180, 0xf, 0xc4203880f4, 0x40, 0xc4203880f0, 0x3, 0xc42073e270, >> 0xf, ...) >> /home/nupur/golang/code/src/wservce/controllers/users.go:172 +0x106c >> fp=0xc420483410 sp=0xc420483040 >> wservce/controllers.(*Request).Dashboard(0xc4202b8660, 0x0, 0x0) >> <autogenerated>:5 +0x6e fp=0xc420483488 sp=0xc420483410 >> runtime.call32(0xc4204d09c0, 0xc4205aa060, 0xc420588960, 0x800000018) >> >> >> On Tuesday, June 27, 2017 at 10:04:06 AM UTC+5:30, Dave Cheney wrote: >>> >>> Your stacktrace is truncated; the crucial part appears at the top of the >>> output starting with >>> >>> panic: >>> >>> or >>> >>> runtime error: >>> >>> On Tuesday, 27 June 2017 14:31:57 UTC+10, Nupur Bansal wrote: >>>> >>>> When a load test is run on my service, after about 1000-1500 requests, >>>> I get this stack trace. I am unable to resolve why it was generated. >>>> Yes, the output from the service is passed to an output channel and is >>>> read through that channel. >>>> >>>> I am doing something like this: >>>> package main >>>> >>>> import ( >>>> "fmt" >>>> //"time" >>>> ) >>>> >>>> func myFunc(done chan string) { >>>> // Doing something in parallel >>>> for i := 0; i < 10; i++ { >>>> fmt.Println(i) >>>> } >>>> fmt.Println("Hey! I do useless stuff!") >>>> done <- "I'm done!" // We send a message on the channel >>>> } >>>> >>>> func main() { >>>> done1 := make(chan string) >>>> done2 := make(chan string) >>>> go myFunc(done1) >>>> go myFunc2(done2) >>>> msg := <-done1 >>>> msg2 := <-done2 >>>> fmt.Println(msg, msg2) >>>> >>>> fmt.Println("Message received, you were indeed useless..") >>>> } >>>> >>>> func myFunc2(done chan string) { >>>> // Doing something in parallel >>>> for i := 10; i < 20; i++ { >>>> fmt.Println(i) >>>> } >>>> fmt.Println("Hey! Baby!") >>>> done <- "I'm again done!" // We send a message on the channel >>>> } >>>> >>>> >>>> On Thursday, June 22, 2017 at 8:09:33 PM UTC+5:30, Ian Lance Taylor >>>> wrote: >>>>> >>>>> On Wed, Jun 21, 2017 at 10:49 PM, <nupur....@indiamart.com> wrote: >>>>> > >>>>> > I am getting the following error when my services are being load >>>>> tested. >>>>> > I am new to goroutines and may be missing something in my >>>>> implementation. >>>>> > My service on being hit is running 2 goroutines that call an http >>>>> request. >>>>> > After both return , the response from both http requests is returned >>>>> into a >>>>> > channel. >>>>> > What could be the possible reason of the following stack trace of >>>>> error?? >>>>> >>>>> What caused the stack trace? I would have expected to see something >>>>> at the start saying why it was generated, but I didn't. >>>>> >>>>> At first glance it looks like you have a deadlock somewhere. Is there >>>>> something reading from the channels? >>>>> >>>>> Ian >>>>> >>>> -- <https://track.indiamart.com/af_ck?offer_id=1&aff_id=1&url_id=2&source=MailBanner> https://www.youtube.com/watch?v=ch-1-DKUQcg -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
