[Bug 111376] [bisected] Steam crashes when newest Iris built with LTO

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111376

--- Comment #5 from Mike Lothian <mike at fireburn.co.uk> ---
Here's a slightly different back trace:

Thread 1 "steam" received signal SIGSEGV, Segmentation fault.
0xf6411277 in ir_function::clone(void*, hash_table*) const () from
/usr/lib/dri/iris_dri.so
(gdb) bt
#0  0xf6411277 in ir_function::clone(void*, hash_table*) const () from
/usr/lib/dri/iris_dri.so
#1  0xf641ce8c in clone_ir_list(void*, exec_list*, exec_list const*) () from
/usr/lib/dri/iris_dri.so
#2  0xf5e0c875 in link_intrastage_shaders(void*, gl_context*,
gl_shader_program*, gl_shader**, unsigned int, bool) [clone .constprop.0] ()
from /usr/lib/dri/iris_dri.so
#3  0xf640c187 in link_shaders(gl_context*, gl_shader_program*) [clone .part.0]
() from /usr/lib/dri/iris_dri.so
#4  0xf64c70f3 in _mesa_glsl_link_shader () from /usr/lib/dri/iris_dri.so
#5  0xf66787a2 in _mesa_get_fixed_func_fragment_program () from
/usr/lib/dri/iris_dri.so
#6  0xf675c63b in update_program () from /usr/lib/dri/iris_dri.so
#7  0xf6772b0f in _mesa_update_state_locked () from /usr/lib/dri/iris_dri.so
#8  0xf6773217 in _mesa_update_state () from /usr/lib/dri/iris_dri.so
#9  0xf64974a7 in _mesa_Clear () from /usr/lib/dri/iris_dri.so
#10 0xed1a3806 in ?? () from
/home/fireburn/.local/share/Steam/ubuntu12_32/vgui2_s.so
#11 0xed1b24ed in ?? () from
/home/fireburn/.local/share/Steam/ubuntu12_32/vgui2_s.so
#12 0xf054bc6d in ?? () from
/home/fireburn/.local/share/Steam/ubuntu12_32/steamui.so
#13 0xf054bef5 in ?? () from
/home/fireburn/.local/share/Steam/ubuntu12_32/steamui.so
#14 0xf053e28f in ?? () from
/home/fireburn/.local/share/Steam/ubuntu12_32/steamui.so
#15 0xf0491eaa in ?? () from
/home/fireburn/.local/share/Steam/ubuntu12_32/steamui.so
#16 0xf0493c2e in ?? () from
/home/fireburn/.local/share/Steam/ubuntu12_32/steamui.so
#17 0x5658e1b0 in RunSteam(int, char**, bool) ()
#18 0x5658f0ab in ?? ()
#19 0x5657a06c in ?? ()
#20 0xf78a5021 in __libc_start_main () from /lib/libc.so.6
#21 0x5657dd29 in _start ()

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