[Bug middle-end/61573] [4.10 Regression] ICE: Segmentation fault building Linux kernel

["mliska at suse dot cz" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61573

Martin Liška <mliska at suse dot cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mliska at suse dot cz

--- Comment #3 from Martin Liška <mliska at suse dot cz> ---
Bug introduced in r211363.
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From: "mliska at suse dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/61573] [4.10 Regression] ICE: Segmentation fault building Linux kernel
Date: Fri, 20 Jun 2014 08:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61573

--- Comment #4 from Martin Liška <mliska at suse dot cz> ---
fndecl deletion place:

Old value = (tree) 0x7ffff6d4a700
New value = (tree) 0xa5a5a5a5a5a5a5a5
memset () at ../sysdeps/x86_64/memset.S:90
90    ../sysdeps/x86_64/memset.S: No such file or directory.
(gdb) bt
#0  memset () at ../sysdeps/x86_64/memset.S:90
#1  0x00000000006478e7 in ggc_free (p=<optimized out>) at
../../gcc/ggc-page.c:1592
#2  0x00000000006bdeac in release_function_body (decl=0x7ffff6d4a800) at
../../gcc/cgraph.c:1704
#3  0x00000000006be030 in cgraph_release_function_body (node=0x7ffff6d69170) at
../../gcc/cgraph.c:1729
#4  0x00000000006be431 in cgraph_remove_node (node=0x7ffff6d69170) at
../../gcc/cgraph.c:1814
#5  0x000000000055f7aa in duplicate_decls (newdecl=0x7ffff6d4a800,
olddecl=0x7ffff6d4a700) at ../../gcc/c/c-decl.c:2584
#6  0x000000000056008e in pushdecl (x=0x7ffff6d4a800) at
../../gcc/c/c-decl.c:2725
#7  0x0000000000564673 in start_decl (declarator=0x1876620,
declspecs=0x1876590, initialized=false, attributes=0x0)
    at ../../gcc/c/c-decl.c:4277
#8  0x00000000005cd865 in c_parser_declaration_or_fndef
(parser=parser@entry=0x7ffff6d67000, fndef_ok=false, fndef_ok@entry=true, 
    static_assert_ok=static_assert_ok@entry=true, empty_ok=empty_ok@entry=true,
nested=nested@entry=false, 
    start_attr_ok=start_attr_ok@entry=true,
objc_foreach_object_declaration=objc_foreach_object_declaration@entry=0x0, 
    omp_declare_simd_clauses=..., omp_declare_simd_clauses@entry=...) at
../../gcc/c/c-parser.c:1798
#9  0x00000000005d26b6 in c_parser_external_declaration (parser=0x7ffff6d67000)
at ../../gcc/c/c-parser.c:1400
#10 0x00000000005d316a in c_parser_translation_unit (parser=0x7ffff6d67000) at
../../gcc/c/c-parser.c:1287
#11 c_parse_file () at ../../gcc/c/c-parser.c:14082
#12 0x00000000006277c5 in c_common_parse_file () at
../../gcc/c-family/c-opts.c:1067
#13 0x0000000000a09f32 in compile_file () at ../../gcc/toplev.c:548
#14 0x0000000000a0bee5 in do_compile () at ../../gcc/toplev.c:1918
#15 toplev_main (argc=14, argv=0x7fffffffd9b8) at ../../gcc/toplev.c:1994
#16 0x00007ffff6e4ebe5 in __libc_start_main (main=0x554f50 <main(int, char**)>,
argc=14, argv=0x7fffffffd9b8, init=<optimized out>, 
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffd9a8)
at libc-start.c:269
#17 0x0000000000554fd1 in _start () at ../sysdeps/x86_64/start.S:122
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Subject: [Bug target/61570] -march=native CPU you selected does not support x86-64 instruction under QEMU
Date: Fri, 20 Jun 2014 09:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida570

--- Comment #1 from Mikael Pettersson <mikpelinux at gmail dot com> ---
Well, qemu seems confused (as usual).  Having "lm" and "lahf_lm"in the CPUID
feature flags and a 48-bit virtual address space implies being 64-bit, but
Intel Family 6 Model 13 implies being the 32-bit only Pentium-M.

Since real HW doesn't get this confused I'd classify it as a qemu bug.  (We've
seen several similar "impossible" cases in LKML.)