This is the stack information printed when blocking, how to see which G
blocking program?
SIGABRT: abort
PC=0x7fff9ceabbf2 m=0 sigcode=0
goroutine 0 [idle]:
runtime.pthread_cond_wait(0x1967620, 0x19675e0, 0x7fff00000000)
/usr/local/go/src/runtime/sys_darwin.go:302 +0x51
runtime.semasleep(0xffffffffffffffff, 0x7fff5fbff670)
/usr/local/go/src/runtime/os_darwin.go:63 +0x85
runtime.notesleep(0x19673e0)
/usr/local/go/src/runtime/lock_sema.go:167 +0xe3
runtime.stoplockedm()
/usr/local/go/src/runtime/proc.go:2165 +0x8a
runtime.schedule()
/usr/local/go/src/runtime/proc.go:2565 +0x2d9
runtime.park_m(0xc000072480)
/usr/local/go/src/runtime/proc.go:2676 +0xae
runtime.mcall(0x105722b)
/usr/local/go/src/runtime/asm_amd64.s:299 +0x5b
goroutine 1 [semacquire]:
sync.runtime_Semacquire(0xc000027794)
/usr/local/go/src/runtime/sema.go:56 +0x39
sync.(*WaitGroup).Wait(0xc000027794)
/usr/local/go/src/sync/waitgroup.go:130 +0x64
cmd/go/internal/work.(*Builder).Do(0xc00023b0e0, 0xc0003ee3c0)
/usr/local/go/src/cmd/go/internal/work/exec.go:174 +0x38e
cmd/go/internal/run.runRun(0x195c300, 0xc00001e0e0, 0x1, 0x1)
/usr/local/go/src/cmd/go/internal/run/run.go:137 +0x55b
main.main()
/usr/local/go/src/cmd/go/main.go:219 +0x7d4
goroutine 5 [syscall]:
os/signal.signal_recv(0x0)
/usr/local/go/src/runtime/sigqueue.go:139 +0x9f
os/signal.loop()
/usr/local/go/src/os/signal/signal_unix.go:23 +0x22
created by os/signal.init.0
/usr/local/go/src/os/signal/signal_unix.go:29 +0x41
goroutine 50 [select]:
cmd/go/internal/work.(*Builder).Do.func2(0xc000027794, 0xc00023b0e0,
0xc0004b0620)
/usr/local/go/src/cmd/go/internal/work/exec.go:155 +0x12f
created by cmd/go/internal/work.(*Builder).Do
/usr/local/go/src/cmd/go/internal/work/exec.go:152 +0x36a
goroutine 51 [select]:
cmd/go/internal/work.(*Builder).Do.func2(0xc000027794, 0xc00023b0e0,
0xc0004b0620)
/usr/local/go/src/cmd/go/internal/work/exec.go:155 +0x12f
created by cmd/go/internal/work.(*Builder).Do
/usr/local/go/src/cmd/go/internal/work/exec.go:152 +0x36a
goroutine 52 [syscall]:
syscall.Syscall6(0x7, 0x12006, 0xc000050c24, 0x0, 0xc0002f43f0, 0x0, 0x0,
0xc0002f43f0, 0x0, 0xc0000e2400)
/usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
syscall.wait4(0x12006, 0xc000050c24, 0x0, 0xc0002f43f0, 0x90, 0x1566d60,
0x14cc401)
/usr/local/go/src/syscall/zsyscall_darwin_amd64.go:34 +0x7b
syscall.Wait4(0x12006, 0xc000050c74, 0x0, 0xc0002f43f0, 0x0, 0x1, 0x1)
/usr/local/go/src/syscall/syscall_bsd.go:129 +0x51
os.(*Process).wait(0xc0002fd4a0, 0xc000034a00, 0xc000050cf8, 0x0)
/usr/local/go/src/os/exec_unix.go:38 +0x7b
os.(*Process).Wait(0xc0002fd4a0, 0x15b89c8, 0x15b89d0, 0x15b89c0)
/usr/local/go/src/os/exec.go:125 +0x2b
os/exec.(*Cmd).Wait(0xc00052da20, 0x0, 0x0)
/usr/local/go/src/os/exec/exec.go:465 +0x5b
os/exec.(*Cmd).Run(0xc00052da20, 0x50, 0xc0000df7c0)
/usr/local/go/src/os/exec/exec.go:309 +0x5c
cmd/go/internal/base.RunStdin(0xc0000df7c0, 0x1, 0x1)
/usr/local/go/src/cmd/go/internal/base/base.go:162 +0x11e
cmd/go/internal/run.buildRunProgram(0xc00023b0e0, 0xc0003ee3c0, 0x13999b3,
0xc00023b150)
/usr/local/go/src/cmd/go/internal/run/run.go:151 +0x26d
cmd/go/internal/work.(*Builder).Do.func1(0xc0003ee3c0)
/usr/local/go/src/cmd/go/internal/work/exec.go:107 +0x72
cmd/go/internal/work.(*Builder).Do.func2(0xc000027794, 0xc00023b0e0,
0xc0004b0620)
/usr/local/go/src/cmd/go/internal/work/exec.go:165 +0xbb
created by cmd/go/internal/work.(*Builder).Do
/usr/local/go/src/cmd/go/internal/work/exec.go:152 +0x36a
goroutine 53 [select]:
cmd/go/internal/work.(*Builder).Do.func2(0xc000027794, 0xc00023b0e0,
0xc0004b0620)
/usr/local/go/src/cmd/go/internal/work/exec.go:155 +0x12f
created by cmd/go/internal/work.(*Builder).Do
/usr/local/go/src/cmd/go/internal/work/exec.go:152 +0x36a
goroutine 24 [chan receive]:
cmd/go/internal/base.processSignals.func1(0xc000086f00)
/usr/local/go/src/cmd/go/internal/base/signal.go:21 +0x34
created by cmd/go/internal/base.processSignals
/usr/local/go/src/cmd/go/internal/base/signal.go:20 +0x93
rax 0x104
rbx 0xea00
rcx 0x7fff5fbff488
rdx 0xea00
rdi 0x1967620
rsi 0xea010000eb00
rbp 0x7fff5fbff520
rsp 0x7fff5fbff488
r8 0x0
r9 0x60
r10 0x0
r11 0x202
r12 0x1967620
r13 0x16
r14 0x1
r15 0x7fffa5c9d3c0
rip 0x7fff9ceabbf2
rflags 0x203
cs 0x7
fs 0x0
gs 0x0
在 2019年2月28日星期四 UTC+8下午8:44:55，Sameer Ajmani写道：
>
> The deadlock happens because the channel is empty, so the receive
> operation blocks forever.
>
> The second version imports a package that may start new goroutines in its
> init functions. If so, those goroutines may not be deadlocked, but the main
> function is still blocked on the receive operation.
>
> It can be useful to send SIGQUIT to a blocked Go program to dump the
> goroutine stack traces to the terminal.
>
> S
>
> On Thu, Feb 28, 2019 at 4:19 AM <mount...@gmail.com <javascript:>> wrote:
>
>> dead lock：
>>
>> package main
>>
>> import (
>> "fmt"
>> // _ "github.com/go-sql-driver/mysql"
>> )
>>
>> func main() {
>> c1 := make(chan int, 10)
>> fmt.Println(<-c1)
>> }
>>
>>
>> block：
>>
>> package main
>>
>> import (
>> "fmt"
>>
>> _ "github.com/go-sql-driver/mysql"
>> )
>>
>> func main() {
>> c1 := make(chan int, 10)
>> fmt.Println(<-c1)
>> }
>>
>> --
>> 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...@googlegroups.com <javascript:>.
>> For more options, visit https://groups.google.com/d/optout.
>>
>
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