[Bug runtime/27465] ERROR: Couldn't insert module&Invalid module format

["v.mayatskih at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27465

--- Comment #6 from Vitaly Mayatskikh <v.mayatskih at gmail dot com> ---
check_version fails for module_layout:


   204 insmod(43808):   ->check_version info={.name="stap_30878",
.mod=0xffffa1dc617d1740, .hdr=0xffffa1dc617c1000, .len=142104,
.sechdrs=0xffffa1dc617e3098, .secstrings="", .strtab="", .symoffs=0,
.stroffs=0, .init_typeoffs=0, .core_typeoffs=0, .debug=0x0, .num_debug=0,
.sig_ok=0, .mod_kallsyms_init_off=0, .index={.sym=39, .str=40, .mod=34,
.vers=0, .info=21, .pcpu=32}} symname="module_layout" crc=-1290631832 mod=ERROR
   207 insmod(43808):   <-check_version return=0x0

This is for non-guru case (does not fail):

   311 insmod(43893):   ->check_version info={.name="stap_11738",
.mod=0xffffa1dc617d1c00, .hdr=0xffffa1dc617c1000, .len=139264,
.sechdrs=0xffffa1dc617e2540, .secstrings="", .strtab="", .symoffs=0,
.stroffs=0, .init_typeoffs=0, .core_typeoffs=0, .debug=0x0, .num_debug=0,
.sig_ok=0, .mod_kallsyms_init_off=0, .index={.sym=40, .str=41, .mod=35,
.vers=24, .info=21, .pcpu=33}} symname="module_layout" crc=-1290631832
mod=ERROR
   319 insmod(43893):   <-check_version return=0x1

____versions symbol is missing in the "broken" module:

$ sudo readelf -a /tmp/stapzTtc4M/stap_11738.ko | grep version
  [24] __versions        PROGBITS         0000000000000000  0000cc80
    27: 0000000000000076    35 OBJECT  LOCAL  DEFAULT   21
__UNIQUE_ID_srcversion127
    29: 0000000000000000  8832 OBJECT  LOCAL  DEFAULT   24 ____versions

$ sudo readelf -a /tmp/stapykqAs1/stap_30878.ko | grep version
    26: 00000000000000a3    35 OBJECT  LOCAL  DEFAULT   21
__UNIQUE_ID_srcversion127

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