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Date:      Mon, 04 Jun 2018 21:03:54 +0000
From:      bugzilla-noreply@freebsd.org
To:        ports-bugs@FreeBSD.org
Subject:   [Bug 225128] [exp-run] with LLD_BOOTSTRAP on i386
Message-ID:  <bug-225128-7788-bCj2XDOWmG@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-225128-7788@https.bugs.freebsd.org/bugzilla/>
References:  <bug-225128-7788@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D225128

Mark Johnston <markj@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |228753, 228574

--- Comment #34 from Mark Johnston <markj@FreeBSD.org> ---
The issue arises with the objects built from lib/csu. If they're linked by
ld.bfd instead, the hang doesn't occur.

If I use binutils 2.30 to link conftest.c, I get an interesting warning:

markj@pesky> clang conftest.c=20
conftest.c:1:43: warning: control reaches end of non-void function
[-Wreturn-type]
int k; int foo () { __builtin_alloca (k); }
                                          ^
1 warning generated.
/usr/bin/ld: Dwarf Error: Line info data is bigger (0xefb0101) than the spa=
ce
remaining in the section (0x23f)
/usr/lib/crt1.o: In function `_start1':
(.text+0xa0): undefined reference to `main'
clang: error: linker command failed with exit code 1 (use -v to see invocat=
ion)

ld from binutils 2.18.5 is spinning with this stack:

(gdb) bt
#0  0x000d0c1c in add_line_info (table=3D0x207d4548, address=3D<optimized o=
ut>,
filename=3D0x201a80c0 "\001/usr/home/markj/src/freebsd-dev/lib/csu/i386", l=
ine=3D1,=20
    column=3D0, end_sequence=3D0) at
/usr/home/markj/src/freebsd-dev/gnu/usr.bin/binutils/libbfd/../../../../con=
trib/binutils/bfd/dwarf2.c:849
#1  0x000cfd1e in decode_line_info (unit=3D<optimized out>, stash=3D<optimi=
zed
out>)
    at
/usr/home/markj/src/freebsd-dev/gnu/usr.bin/binutils/libbfd/../../../../con=
trib/binutils/bfd/dwarf2.c:1169
#2  0x000cf693 in comp_unit_find_nearest_line (unit=3D0x207d44bc, addr=3D<o=
ptimized
out>, filename_ptr=3D0xffbfe5d0, functionname_ptr=3D0xffbfe5cc,=20
    linenumber_ptr=3D0xffbfe5c8, stash=3D0x20469e30)
    at
/usr/home/markj/src/freebsd-dev/gnu/usr.bin/binutils/libbfd/../../../../con=
trib/binutils/bfd/dwarf2.c:2103
#3  0x000ced29 in find_line (abfd=3D0x201d50c0, section=3D<optimized out>,
offset=3D160, symbol=3D0x0, symbols=3D0x20480000, filename_ptr=3D0xffbfe5d0=
,=20
    functionname_ptr=3D0xffbfe5cc, linenumber_ptr=3D0xffbfe5c8, addr_size=
=3D0,
pinfo=3D0x20197344)
    at
/usr/home/markj/src/freebsd-dev/gnu/usr.bin/binutils/libbfd/../../../../con=
trib/binutils/bfd/dwarf2.c:2575
#4  0x000ce063 in _bfd_dwarf2_find_nearest_line (abfd=3D0x201d50c0,
section=3D0x201990d0, symbols=3D0x20480000, offset=3D160, filename_ptr=3D0x=
ffbfe5d0,=20
    functionname_ptr=3D0xffbfe5cc, linenumber_ptr=3D0xffbfe5c8, addr_size=
=3D0,
pinfo=3D0x20197344)
    at
/usr/home/markj/src/freebsd-dev/gnu/usr.bin/binutils/libbfd/../../../../con=
trib/binutils/bfd/dwarf2.c:2607
#5  0x000ac37e in _bfd_elf_find_nearest_line (abfd=3D0x201d50c0,
section=3D0x201990d0, symbols=3D0x20480000, offset=3D160, filename_ptr=3D0x=
ffbfe5d0,=20
    functionname_ptr=3D0xffbfe5cc, line_ptr=3D0xffbfe5c8)
    at
/usr/home/markj/src/freebsd-dev/gnu/usr.bin/binutils/libbfd/../../../../con=
trib/binutils/bfd/elf.c:7198
#6  0x0007c3a9 in vfinfo (fp=3D0x181bac <__sF+472>, fmt=3D0x250e8 " undefin=
ed
reference to `%T'\n", arg=3D0xffbfe668 "\300P\035 \320\220\031 \240",
is_warning=3D1)
    at
/usr/home/markj/src/freebsd-dev/gnu/usr.bin/binutils/ld/../../../../contrib=
/binutils/ld/ldmisc.c:324
#7  0x0007c82d in einfo (fmt=3D0x250e3 "%X%C: undefined reference to `%T'\n=
")
    at
/usr/home/markj/src/freebsd-dev/gnu/usr.bin/binutils/ld/../../../../contrib=
/binutils/ld/ldmisc.c:465
#8  0x0007b838 in undefined_symbol (info=3D0x1831d0 <link_info>, name=3D0x2=
01bf6c8
"main", abfd=3D0x201d50c0, section=3D0x201990d0, address=3D160, error=3D1)
    at
/usr/home/markj/src/freebsd-dev/gnu/usr.bin/binutils/ld/../../../../contrib=
/binutils/ld/ldmain.c:1397
#9  0x0008f1d6 in elf_i386_relocate_section (output_bfd=3D0x201d5000,
info=3D0x1831d0 <link_info>, input_bfd=3D0x201d50c0, input_section=3D0x2019=
90d0,=20
    contents=3D0x206d5000
"1\355U\211\345\203\344\360\215E\b\203\354\004P\377u\004R\350\b",
relocs=3D0x201d8288, local_syms=3D0x2046be00,=20
    local_sections=3D0x201ff400) at
/usr/home/markj/src/freebsd-dev/gnu/usr.bin/binutils/libbfd/../../../../con=
trib/binutils/bfd/elf32-i386.c:2346
#10 0x000bb38d in elf_link_input_bfd (input_bfd=3D<optimized out>,
finfo=3D<optimized out>)
    at
/usr/home/markj/src/freebsd-dev/gnu/usr.bin/binutils/libbfd/../../../../con=
trib/binutils/bfd/elflink.c:8706
#11 bfd_elf_final_link (abfd=3D0x201d5000, info=3D0x1831d0 <link_info>)
    at
/usr/home/markj/src/freebsd-dev/gnu/usr.bin/binutils/libbfd/../../../../con=
trib/binutils/bfd/elflink.c:9843
#12 0x0007cf35 in ldwrite () at
/usr/home/markj/src/freebsd-dev/gnu/usr.bin/binutils/ld/../../../../contrib=
/binutils/ld/ldwrite.c:557
#13 0x0007a728 in main (argc=3D<optimized out>, argv=3D<optimized out>)
    at
/usr/home/markj/src/freebsd-dev/gnu/usr.bin/binutils/ld/../../../../contrib=
/binutils/ld/ldmain.c:468


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D228574
[Bug 228574] GNU ld doesn't emit _end when linking with lld-linked libc.so
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D228753
[Bug 228753] [i386] lld emits malformed DWARF info for crt1.o
--=20
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