On Thu, 2013-12-05 at 16:19 +0100, Jan Kratochvil wrote: > On Thu, 05 Dec 2013 11:26:13 +0100, Mark Wielaard wrote: > > The backtrace generated is: > > > > TID 31941: > > #0 0x00007fd3a47975db raise > sigusr2 is missing here > > #1 0x00007fd3a4bc7dec stdarg > > #2 0x00007fd3a4bc7e70 backtracegen > > #3 0x00007fd3a4bc7e79 start > > #4 0x00007fd3a478f9d1 start_thread > > #5 0x00007fd3a44dcb6d __clone > > it is because of -O2 in build CFLAGS and tail call optimization: > > Dump of assembler code for function sigusr2: > [...] > 0x00007f1fc53bdd43 <+19>: mov $0x6,%edi > 0x00007f1fc53bdd48 <+24>: add $0x8,%rsp > 0x00007f1fc53bdd4c <+28>: jmpq 0x7f1fc53bd960 <raise@plt>
O, nice. So our raw backtrace was indeed correct in this case since the tail call made the frame disappear. > OK for check-in? Yes, of course. Thanks, Mark
