https://sourceware.org/bugzilla/show_bug.cgi?id=21180
Bug ID: 21180
Summary: ld segfault for microblaze when --gc-sections is used
Product: binutils
Version: 2.29 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: wbx at openadk dot org
Target Milestone: ---
The buildroot autobuilders found two packages which are failing to compile for
microblaze, because ld segfaults. This happens with binutils 2.26.1, but can be
reproduced with binutils git from today.
The packages are nss and kmod (when python support is enabled).
Backtrace for nss with binutils 2.26.1:
gdb ./output/host/usr/bin/microblazeel-linux-ld.bfd
./output/build/libnss-3.27.2/nss/lib/freebl/core
GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
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Reading symbols from ./output/host/usr/bin/microblazeel-linux-ld.bfd...(no
debugging symbols found)...done.
warning: core file may not match specified executable file.
[New LWP 7756]
Core was generated by
`/home/wbx/buildroot/output/host/usr/lib/gcc/microblazeel-buildroot-linux-uclibc'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x000000000043b4a4 in microblaze_elf_finish_dynamic_symbol ()
(gdb) bt
#0 0x000000000043b4a4 in microblaze_elf_finish_dynamic_symbol ()
#1 0x0000000000453e94 in elf_link_output_extsym ()
#2 0x000000000042d591 in bfd_hash_traverse ()
#3 0x00000000004628ba in bfd_elf_final_link ()
#4 0x0000000000418966 in ldwrite ()
#5 0x00000000004038c9 in main ()
(gdb) info reg
rax 0xe8fac 954284
rbx 0x15f1220 23007776
rcx 0x70c680 7390848
rdx 0x18025d8 25175512
rsi 0x9c 156
rdi 0x0 0
rbp 0x15f3600 0x15f3600
rsp 0x7ffd7257eb40 0x7ffd7257eb40
r8 0x8040 32832
r9 0x99d64 630116
r10 0x1 1
r11 0x1 1
r12 0x16022c8 23077576
r13 0x16023f8 23077880
r14 0x17ac6f8 24823544
r15 0x706880 7366784
rip 0x43b4a4 0x43b4a4 <microblaze_elf_finish_dynamic_symbol+1012>
eflags 0x10246 [ PF ZF IF RF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
(gdb) disassemble
...
0x000000000043b48a <+986>: callq 0x42a0b0 <bfd_assert>
0x000000000043b48f <+991>: jmpq 0x43b13f
<microblaze_elf_finish_dynamic_symbol+143>
0x000000000043b494 <+996>: nopl 0x0(%rax)
0x000000000043b498 <+1000>: mov 0x28(%r14),%rdx
0x000000000043b49c <+1004>: mov 0x30(%r14),%rsi
0x000000000043b4a0 <+1008>: mov 0x68(%rdx),%rdi
---Type <return> to continue, or q <return> to quit---
=> 0x000000000043b4a4 <+1012>: add 0x28(%rdi),%rsi
0x000000000043b4a8 <+1016>: add 0x60(%rdx),%rsi
0x000000000043b4ac <+1020>: mov 0x88(%r12),%edx
0x000000000043b4b4 <+1028>: lea 0x1(%rdx),%edi
0x000000000043b4b7 <+1031>: mov %edi,0x88(%r12)
0x000000000043b4bf <+1039>: mov 0xb0(%r12),%rdi
0x000000000043b4c7 <+1047>: mov %rax,0x30(%rsp)
0x000000000043b4cc <+1052>: movq $0x10,0x38(%rsp)
0x000000000043b4d5 <+1061>: mov %edx,%eax
0x000000000043b4d7 <+1063>: mov %rsi,0x40(%rsp)
0x000000000043b4dc <+1068>: jmpq 0x43b349
<microblaze_elf_finish_dynamic_symbol+665>
0x000000000043b4e1 <+1073>: nopl 0x0(%rax)
0x000000000043b4e8 <+1080>: mov $0xc92,%esi
0x000000000043b4ed <+1085>: mov $0x4de331,%edi
0x000000000043b4f2 <+1090>: callq 0x42a0b0 <bfd_assert>
0x000000000043b48a <+986>: callq 0x42a0b0 <bfd_assert>
0x000000000043b48f <+991>: jmpq 0x43b13f
<microblaze_elf_finish_dynamic_symbol+143>
0x000000000043b494 <+996>: nopl 0x0(%rax)
0x000000000043b498 <+1000>: mov 0x28(%r14),%rdx
0x000000000043b49c <+1004>: mov 0x30(%r14),%rsi
0x000000000043b4a0 <+1008>: mov 0x68(%rdx),%rdi
---Type <return> to continue, or q <return> to quit---
=> 0x000000000043b4a4 <+1012>: add 0x28(%rdi),%rsi
0x000000000043b4a8 <+1016>: add 0x60(%rdx),%rsi
0x000000000043b4ac <+1020>: mov 0x88(%r12),%edx
0x000000000043b4b4 <+1028>: lea 0x1(%rdx),%edi
0x000000000043b4b7 <+1031>: mov %edi,0x88(%r12)
0x000000000043b4bf <+1039>: mov 0xb0(%r12),%rdi
0x000000000043b4c7 <+1047>: mov %rax,0x30(%rsp)
0x000000000043b4cc <+1052>: movq $0x10,0x38(%rsp)
0x000000000043b4d5 <+1061>: mov %edx,%eax
0x000000000043b4d7 <+1063>: mov %rsi,0x40(%rsp)
0x000000000043b4dc <+1068>: jmpq 0x43b349
<microblaze_elf_finish_dynamic_symbol+665>
0x000000000043b4e1 <+1073>: nopl 0x0(%rax)
0x000000000043b4e8 <+1080>: mov $0xc92,%esi
0x000000000043b4ed <+1085>: mov $0x4de331,%edi
0x000000000043b4f2 <+1090>: callq 0x42a0b0 <bfd_assert>
...
Removing --gc-sections from LDFLAGS/CFLAGS let the linking work.
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