On Thu, Oct 4, 2018 at 1:35 PM, <papostoles...@gmail.com> wrote: > > Panic was caused by a stack smash, default cgo thread stack size was too > small. My fix is to change cgo thread stack size at compile time by patching > gcc_darwin_amd64.c, _cgo_sys_thread_start: > > 40a41,45 >> #ifdef CGO_STACK_SIZE >> size = CGO_STACK_SIZE; >> pthread_attr_setstacksize(&attr, size); >> #endif >> > > $ CGO_CFLAGS="-DCGO_STACK_SIZE=0x200000" make > > There does not seem to be any other way to increase the stack size for > interop threads.
Glad you figured it out. I believe that the Darwin linker has a flag to set the default stack size, and you can pass it by using `go build -extldflags=-darwin_linker_flag=0x200000`. Ian > On Monday, October 1, 2018 at 7:53:03 PM UTC-4, pba wrote: >> >> I'm running into a situation where my program deadlocks due to >> (apparently) a call to runtime.(*sigctxt).preparePanic which never exits >> (stack below). >> >> The program uses cgo and passes callbacks to the C library, this >> particular panic seems to be triggered when the go callback returns to the C >> code. I cannot debug the C code (binary dependency). >> >> Any suggestions on how to make the the program crash cleanly (i.e. panic >> and exit) ? >> >> go version go1.11 darwin/amd64 >> macOS Sierra (10.12.6) >> >> 2359 Thread_1644947 >> + 2359 _sigtramp (in libsystem_platform.dylib) + 26 [0x7fff9656cb3a] >> + 2359 runtime.sigtramp (in test) + 51 [0x4065fe3] >> + 2359 runtime.sigtrampgo (in test) + 544 [0x4049000] >> + 2359 runtime.sighandler (in test) + 1788 [0x404866c] >> + 2359 runtime.(*sigctxt).preparePanic (in test) + 172 >> [0x40475fc] >> >> Thanks >> > -- > 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. -- 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.
