[forwarded from http://bugs.debian.org/255191]
rechecked with 2.19 and trunk.
The gc libs in the bigloo package, built as non-PIC for performance reason
on platforms that support mixing PIC and non-PIC, contain an R_ARM_PC24
relocation:
0000b328 0001a001 R_ARM_PC24 0000c134 GC_push_current_stack
However, the lib is not flagged as containing relocations in the text
segment:
Flags: 0x2, has entry point, GNU EABI
This appears to be the cause of ld-linux.so segfaulting when it processes
this relocation:
$ LD_TRACE_LOADED_OBJECTS=1 LD_WARN=yes LD_BIND_NOW=yes
/usr/lib/debug/ld-linux.so.2 ./bin/bdb
libbigloobdl_s-2.6d.so =>
/home/ydirson/bigloo-2.6d-32-O1-g/lib/2.6d/libbigloobdl_s-2.6d.so (0x40001000)
libbigloo_s-2.6d.so =>
/home/ydirson/bigloo-2.6d-32-O1-g/lib/2.6d/libbigloo_s-2.6d.so (0x40038000)
libbigloogc-2.6d.so =>
/home/ydirson/bigloo-2.6d-32-O1-g/lib/2.6d/libbigloogc-2.6d.so (0x401b2000)
libdl.so.2 => /lib/libdl.so.2 (0x401e2000)
libm.so.6 => /lib/libm.so.6 (0x401ec000)
libc.so.6 => /lib/libc.so.6 (0x40266000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x4038c000)
/lib/ld-linux.so.2 => /usr/lib/debug/ld-linux.so.2 (0x2aaaa000)
Segmentation fault (core dumped)
As a workaround, I'll force building PIC code on ARM.
Detailed analysis (from Philip Blundell):
$ gdb /usr/lib/debug/ld-linux.so.2 core
[...]
Core was generated by /usr/lib/debug/ld-linux.so.2 ./bin/bdb'.
Program terminated with signal 11, Segmentation fault.
Cannot access memory at address 0x2aab36bc
0x2aab36bc - 0x2aaaa000 = 96bc
and:
96b4: e3c034ff bic r3, r0, #-16777216 ; 0xff000000
96b8: e1824003 orr r4, r2, r3
96bc: e58c4000 str r4, [ip]
96c0: eaffffe6 b 9660 <_dl_relocate_object+0xcac>
Phil has identified this to be the code that relocates R_ARM_PC24 relocs.
Here's a small testcase.
$ echo "f() { return g(); }" > t.c
$ gcc -shared -o t.so t.c
$ readelf -d t.so | grep TEXTREL
If the linker is behaving correctly, the last command should output a
line like:
0x00000016 (TEXTREL) 0x0
p.
--
Summary: ld: does not set DT_TEXTREL on libs with R_ARM_PC24
relocations
Product: binutils
Version: 2.20 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: doko at debian dot org
CC: bug-binutils at gnu dot org
http://sourceware.org/bugzilla/show_bug.cgi?id=10365
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