[Bug 227552] w, uptime i386 cordeump

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227552

Dimitry Andric <dim at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |Open

--- Comment #20 from Dimitry Andric <dim at FreeBSD.org> ---
Hmm, now that we've identified .tbss as a contributor to the problem, it looks
relevant that the r331838 version of libxo.so.0 (compiled with the clang 6.0.0
update) does NOT have a "section to segment mapping" for .tbss:

======================================================================
File: libxo.so.0.r331837
[...]
Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  LOAD           0x000000 0x00000000 0x00000000 0x17224 0x17224 R E 0x1000
  LOAD           0x017228 0x00018228 0x00018228 0x0074d 0x007a0 RW  0x1000
  DYNAMIC        0x017324 0x00018324 0x00018324 0x000d8 0x000d8 RW  0x4
  TLS            0x017228 0x00018228 0x00018228 0x00000 0x00658 R   0x8
  GNU_STACK      0x000000 0x00000000 0x00000000 0x00000 0x00000 RW  0x4

 Section to Segment mapping:
  Segment Sections...
   00     .hash .gnu.hash .dynsym .dynstr .gnu.version .gnu.version_r .rel.dyn
.rel.plt .init .plt .text .fini .rodata .eh_frame .comment .gnu_debuglink
.shstrtab
   01     .tbss .ctors .dtors .jcr .data.rel.ro .dynamic .got .got.plt .data
.bss
   02     .dynamic
   03     .tbss .ctors .dtors .jcr .data.rel.ro .dynamic .got .got.plt
   04
There are 28 section headers, starting at offset 0x17b4c:

Section Headers:
  [Nr] Name              Type            Addr     Off    Size   ES Flg Lk Inf
Al
[...]
  [15] .tbss             NOBITS          00018228 017228 000658 00 WAT  0   0 
8

======================================================================
File: /jail/test-r331838/lib/libxo.so.0.r331838
[...]
Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  LOAD           0x000000 0x00000000 0x00000000 0x17160 0x17160 R E 0x1000
  LOAD           0x017160 0x00018160 0x00018160 0x00604 0x00654 RW  0x1000
  DYNAMIC        0x017264 0x00018264 0x00018264 0x000d8 0x000d8 RW  0x4
  TLS            0x017160 0x00018764 0x00018764 0x00000 0x00050 R   0x8
  GNU_STACK      0x000000 0x00000000 0x00000000 0x00000 0x00000 RW  0x4

 Section to Segment mapping:
  Segment Sections...
   00     .hash .gnu.hash .dynsym .dynstr .gnu.version .gnu.version_r .rel.dyn
.rel.plt .init .plt .text .fini .rodata .eh_frame .comment .gnu_debuglink
.shstrtab
   01     .ctors .dtors .jcr .data.rel.ro .dynamic .got .got.plt .data .bss
   02     .dynamic
   03     .bss
   04
There are 28 section headers, starting at offset 0x1793c:

Section Headers:
  [Nr] Name              Type            Addr     Off    Size   ES Flg Lk Inf
Al
[...]
  [15] .tbss             NOBITS          00018160 017160 000658 00 WAT  0   0 
8


In both r331837 and r331838 worlds, /usr/bin/ld is the GNU BFD ld, so it can't
be caused by ldd being updated from 5.0 to 6.0.  It must be something in an
object file that is being linked into libxo.so.0.

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