This looks like an issue with passing structs by value. g_cclosure_marshal_VOID__PARAM is only allocating a 64 byte stack frame and is calling signal_normal via some marshalling tricks. The prototype for signal_normal includes a large struct which will be partially passed in registers and signal_normal expects to be able to write that out to the parameter save area in the callers frame.
signal_normal does end up writing out parameters to the caller stack: Dump of assembler code for function signal_normal: 0x000000001000c880 <+0>: lis r2,4099 0x000000001000c884 <+4>: addi r2,r2,-4080 0x000000001000c888 <+8>: mflr r0 0x000000001000c88c <+12>: std r31,-8(r1) 0x000000001000c890 <+16>: mr r31,r3 0x000000001000c894 <+20>: std r0,16(r1) 0x000000001000c898 <+24>: stdu r1,-48(r1) 0x000000001000c89c <+28>: std r4,88(r1) 0x000000001000c8a0 <+32>: std r5,96(r1) 0x000000001000c8a4 <+36>: std r6,104(r1) 0x000000001000c8a8 <+40>: std r7,112(r1) 0x000000001000c8ac <+44>: std r8,120(r1) 0x000000001000c8b0 <+48>: std r9,128(r1) 0x000000001000c8b4 <+52>: std r10,136(r1) And since g_cclosure_marshal_VOID__PARAM hasn't allocated enough stack we stomp all over the stack and die. What is interesting is that signal_normal doesn't touch the struct, so why are we bothering to save it? It looks like a missing optimisation in gcc and this test case shows it: struct foo { void *a, *b, *c, *d, *e, *f, *g, *h; #if 1 void *i; #endif }; int bar(struct foo foo) { return 0; } With a struct big enough to not fit into registers, we always save the whole struct out to the stack even if we never touch it: bar: std 3,32(1) std 4,40(1) li 3,0 std 5,48(1) std 6,56(1) std 7,64(1) std 8,72(1) std 9,80(1) std 10,88(1) blr -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1262380 Title: gtk+3.0 FTBFS on ppc64el To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gtk+3.0/+bug/1262380/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs