Thanks..resolved this issue. On Tuesday, June 27, 2017 at 4:13:28 PM UTC+5:30, Dave Cheney wrote: > > That's what globals do. > > On Tuesday, 27 June 2017 20:32:12 UTC+10, Nupur Bansal wrote: >> >> 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>
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