Comment 4 for bug 841825

Created attachment 25197
preprocessed source

seen with 4.6 20110903 on i686-linux-gnu, with -Os and -O2, works with -O1 and -O0, works with -Os and -O2 when omitting -g.

The ICE is triggered by the nsrefcnt WyciwygChannelChild::AddRef line, omitting this line doesn't show the ICE.

$ gcc -c -g -O2 -std=gnu++0x WyciwygChannelChild.ii
/home/chrisccoulson/src/firefox/firefox-7.0~b4+build2+nobinonly/build-tree/mozilla/netwerk/protocol/wyciwyg/WyciwygChannelChild.cpp: In member function 'virtual nsresult mozilla::net::WyciwygChannelChild::CloseCacheEntry(nsresult)':
/home/chrisccoulson/src/firefox/firefox-7.0~b4+build2+nobinonly/build-tree/mozilla/netwerk/protocol/wyciwyg/WyciwygChannelChild.cpp:605:1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.

Program received signal SIGSEGV, Segmentation fault.
0x0820cec8 in expand_debug_expr (exp=0xf28c5d50) at ../../gcc-4_6-branch/gcc/cfgexpand.c:2380
2380 enum machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
(gdb) bt
#0 0x0820cec8 in expand_debug_expr (exp=0xf28c5d50) at ../../gcc-4_6-branch/gcc/cfgexpand.c:2380
#1 0x08210208 in expand_debug_locations () at ../../gcc-4_6-branch/gcc/cfgexpand.c:3316
#2 gimple_expand_cfg () at ../../gcc-4_6-branch/gcc/cfgexpand.c:4112
#3 0x08366147 in execute_one_pass (pass=0x8aa5780) at ../../gcc-4_6-branch/gcc/passes.c:1556
#4 0x083663f5 in execute_pass_list (pass=0x8aa5780) at ../../gcc-4_6-branch/gcc/passes.c:1611
#5 0x08434ac5 in tree_rest_of_compilation (fndecl=0xf3447d80) at ../../gcc-4_6-branch/gcc/tree-optimize.c:422
#6 0x085711f9 in cgraph_expand_function (node=0xf3342000) at ../../gcc-4_6-branch/gcc/cgraphunit.c:1576
#7 0x08572f85 in cgraph_expand_all_functions () at ../../gcc-4_6-branch/gcc/cgraphunit.c:1635
#8 cgraph_optimize () at ../../gcc-4_6-branch/gcc/cgraphunit.c:1899
#9 0x08573405 in cgraph_finalize_compilation_unit () at ../../gcc-4_6-branch/gcc/cgraphunit.c:1096
#10 0x0812682b in cp_write_global_declarations () at ../../gcc-4_6-branch/gcc/cp/decl2.c:4000
#11 0x083f800d in compile_file () at ../../gcc-4_6-branch/gcc/toplev.c:591
#12 do_compile () at ../../gcc-4_6-branch/gcc/toplev.c:1900
#13 toplev_main (argc=16, argv=0xffffd6c4) at ../../gcc-4_6-branch/gcc/toplev.c:1963
#14 0x080d018b in main (argc=16, argv=0xffffd6c4) at ../../gcc-4_6-branch/gcc/main.c:36