https://sourceware.org/bugzilla/show_bug.cgi?id=23470
Bug ID: 23470
Summary: ld.bfd occasionally segfaults after running out of
memory on 32-bit x86
Product: binutils
Version: 2.30
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: awilfox at adelielinux dot org
Target Milestone: ---
Host: i?86-*-*-*
Environment: binutils 2.30 on i586-foxkit-linux-musl (kernel 4.14.56, musl
1.1.19)
While doing final linking for Qt WebKit, ld (without --no-keep-memory) will hit
the memory ceiling of 4 GB on 32-bit x86.
Most of the experimental runs I did just ended with "Memory exhausted", but the
reason I did more than one run in the first place was because the first failure
was a segmentation fault. In two of five runs, I was able to reproduce it:
Core was generated by
`/usr/lib/gcc/i586-foxkit-linux-musl/6.4.0/../../../../i586-foxkit-linux-musl/bi'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0xf7dd7086 in assign_file_positions_except_relocs (link_info=<optimized
out>, abfd=<optimized out>) at elf.c:6124
6124 && tdata->phdr[0].p_type == PT_PHDR
(gdb) bt
#0 0xf7dd7086 in assign_file_positions_except_relocs (link_info=<optimized
out>, abfd=<optimized out>) at elf.c:6124
#1 _bfd_elf_compute_section_file_positions (abfd=<optimized out>,
abfd@entry=0x56ef7cf0, link_info=<optimized out>, link_info@entry=0x567a03c0)
at elf.c:4258
#2 0xf7df593e in bfd_elf_final_link (abfd=<optimized out>, info=<optimized
out>) at elflink.c:11779
#3 0x56651352 in ?? ()
#4 0x56636e42 in ?? ()
#5 0xf7ed5438 in __libc_start_main (main=0x56636740, argc=152,
argv=0xffacad34) at src/env/__libc_start_main.c:74
#6 0x5663754a in ?? ()
#7 0x566374f4 in ?? ()
Everything is built with -g, so I am not sure why some frames don't have
symbols. Additionally, tdata is unfortunately optimised out.
0xf7dd707d <+11165>: mov -0xf0(%ebp),%eax
0xf7dd7083 <+11171>: mov 0x50(%eax),%eax
=> 0xf7dd7086 <+11174>: cmpl $0x6,(%eax)
0xf7dd7089 <+11177>: je 0xf7dd7c5e
<_bfd_elf_compute_section_file_positions+14206>
(gdb) info registers
eax 0x0 0
ecx 0x0 0
edx 0x0 0
ebx 0xf7eaa620 -135616992
esp 0xffaca890 0xffaca890
ebp 0xffaca9b8 0xffaca9b8
esi 0xf7ea7240 -135630272
edi 0x5 5
eip 0xf7dd7086 0xf7dd7086
<_bfd_elf_compute_section_file_positions+11174>
eflags 0x10202 [ IF RF ]
cs 0x23 35
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x63 99
I'll keep the core file here if there is anything else that needs to be done
with it.
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