Bug#569571: [armel] elf_machine_rel(): misaligned memory access
Package: libc6
Version: 2.10.2-2
Severity: important
I don't understand ELF / linker stuff well enough to be sure who is to blame here, so filing against libc6 as the misaligned access is happening in ports/sysdeps/arm/dl-machine.h and a comment in elf/dynamic-link.h (line 49ff) suggests that _not_ having this occur has been an explicit goal of the code.
When trying to load the xapian python module, a misaligned memory access happens in elf_machine_rel():
(sugar-jhbuild)sascha.silbe@flatty:/media/tmp1/sugar-jhbuild/source/sugar-datastore$ gdb $(which python)
GNU gdb (GDB) 7.0.1-debian
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This GDB was configured as "arm-linux-gnueabi".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/python...Reading symbols from /usr/lib/debug/usr/bin/python2.5...done.
(no debugging symbols found)...done.
(gdb) directory /home/sascha.silbe/src/deb/eglibc-2.10.2/elf
Source directories searched: /home/sascha.silbe/src/deb/eglibc-2.10.2/elf:$cdir:$cwd
(gdb) run -c 'import xapian'
Starting program: /usr/bin/python -c 'import xapian'
[Thread debugging using libthread_db enabled]
Program received signal SIGBUS, Bus error.
elf_machine_rel (scope=<value optimized out>, reloc_mode=<value optimized out>, consider_profiling=<value optimized out>) at ../ports/sysdeps/arm/dl-machine.h:429
429 *reloc_addr += value;
(gdb) where
#0 elf_machine_rel (scope=<value optimized out>, reloc_mode=<value optimized out>, consider_profiling=<value optimized out>) at ../ports/sysdeps/arm/dl-machine.h:429
#1 elf_dynamic_do_rel (scope=<value optimized out>, reloc_mode=<value optimized out>, consider_profiling=<value optimized out>) at do-rel.h:120
#2 _dl_relocate_object (scope=<value optimized out>, reloc_mode=<value optimized out>, consider_profiling=<value optimized out>) at dl-reloc.c:268
#3 0x40012580 in dl_open_worker (a=<value optimized out>) at dl-open.c:402
#4 0x4000ddd0 in _dl_catch_error (objname=<value optimized out>, errstring=<value optimized out>, mallocedp=<value optimized out>, operate=<value optimized out>, args=0xbec41b78) at dl-error.c:178
#5 0x40011d80 in _dl_open (file=0xbec420cc "/usr/lib/python2.5/site-packages/_xapian.so", mode=-2147483646, caller_dlopen=0xb763c, nsid=-2, argc=3, argv=0xbec47814, env=0xbec47824) at dl-open.c:615
#6 0x40051ae0 in dlopen_doit (a=<value optimized out>) at dlopen.c:67
#7 0x4000ddd0 in _dl_catch_error (objname=<value optimized out>, errstring=<value optimized out>, mallocedp=<value optimized out>, operate=<value optimized out>, args=0xbec41dd8) at dl-error.c:178
#8 0x40051fa8 in _dlerror_run (operate=0x40051a68 <dlopen_doit>, args=0xbec41dd8) at dlerror.c:164
#9 0x40051a30 in __dlopen (file=0x40024000 "H?\002", mode=1) at dlopen.c:88
#10 0x000b763c in _PyImport_GetDynLoadFunc (fqname=<value optimized out>, shortname=<value optimized out>, pathname=0xbec420cc "/usr/lib/python2.5/site-packages/_xapian.so", fp=0x170298) at ../Python/dynload_shlib.c:134
#11 0x000a8bb4 in _PyImport_LoadDynamicModule (name=0xbec43140 "_xapian", pathname=0xbec420cc "/usr/lib/python2.5/site-packages/_xapian.so", fp=0x170298) at ../Python/importdl.c:42
#12 0x000a6ae4 in load_module (name=0xbec43140 "_xapian", fp=0x170298, buf=<value optimized out>, type=3, loader=0x0) at ../Python/import.c:1758
#13 0x000a7350 in import_submodule (mod=0x111e00, subname=0xbec43140 "_xapian", fullname=0xbec43140 "_xapian") at ../Python/import.c:2400
#14 0x000a75f8 in load_next (mod=0x111e00, altmod=0x111e00, p_name=<value optimized out>, buf=0xbec43140 "_xapian", p_buflen=0x111e00) at ../Python/import.c:2220
#15 0x000a7c18 in import_module_level (name=0x34400000 <Address 0x34400000 out of bounds>, globals=<value optimized out>, locals=<value optimized out>, fromlist=0x111e00, level=-1) at ../Python/import.c:2001
#16 0x000a7fd8 in PyImport_ImportModuleLevel (name=0x4029a574 "_xapian", globals=0x40295810, locals=0x40295810, fromlist=0x111e00, level=-1) at ../Python/import.c:2072
#17 0x0008a860 in builtin___import__ (self=<value optimized out>, args=<value optimized out>, kwds=<value optimized out>) at ../Python/bltinmodule.c:47
#18 0x000d9da4 in PyCFunction_Call (func=0x402494b8, arg=0x4030c150, kw=0x1) at ../Objects/methodobject.c:77
#19 0x0001ceec in PyObject_Call (func=0x1a4030, arg=0x400242c0, kw=0x1) at ../Objects/abstract.c:1861
#20 0x0008b4d8 in PyEval_CallObjectWithKeywords (func=0x402494b8, arg=0x4030c150, kw=<value optimized out>) at ../Python/ceval.c:3481
#21 0x0008e050 in PyEval_EvalFrameEx (f=0x1a1fa0, throwflag=<value optimized out>) at ../Python/ceval.c:2093
#22 0x00092720 in PyEval_EvalCodeEx (co=0x40309bf0, globals=<value optimized out>, locals=<value optimized out>, args=0x0, argcount=1121792, kws=0x92880, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:2875
#23 0x00092880 in PyEval_EvalCode (co=0x1a4030, globals=0x400242c0, locals=0x1) at ../Python/ceval.c:514
#24 0x000a4c74 in PyImport_ExecCodeModuleEx (name=0xbec463f0 "xapian", co=0x40309bf0, pathname=0xbec4433c "/usr/lib/python2.5/site-packages/xapian.pyc") at ../Python/import.c:675
#25 0x000a675c in load_source_module (name=0xbec463f0 "xapian", pathname=0xbec4433c "/usr/lib/python2.5/site-packages/xapian.pyc", fp=<value optimized out>) at ../Python/import.c:959
#26 0x000a7350 in import_submodule (mod=0x111e00, subname=0xbec463f0 "xapian", fullname=0xbec463f0 "xapian") at ../Python/import.c:2400
#27 0x000a75f8 in load_next (mod=0x111e00, altmod=0x111e00, p_name=<value optimized out>, buf=0xbec463f0 "xapian", p_buflen=0x111e00) at ../Python/import.c:2220
#28 0x000a7c18 in import_module_level (name=0x34400000 <Address 0x34400000 out of bounds>, globals=<value optimized out>, locals=<value optimized out>, fromlist=0x111e00, level=-1) at ../Python/import.c:2001
#29 0x000a7fd8 in PyImport_ImportModuleLevel (name=0x402889b4 "xapian", globals=0x40258d20, locals=0x40258d20, fromlist=0x111e00, level=-1) at ../Python/import.c:2072
#30 0x0008a860 in builtin___import__ (self=<value optimized out>, args=<value optimized out>, kwds=<value optimized out>) at ../Python/bltinmodule.c:47
#31 0x000d9da4 in PyCFunction_Call (func=0x402494b8, arg=0x402844e0, kw=0x1) at ../Objects/methodobject.c:77
#32 0x0001ceec in PyObject_Call (func=0x1a4030, arg=0x400242c0, kw=0x1) at ../Objects/abstract.c:1861
#33 0x0008b4d8 in PyEval_CallObjectWithKeywords (func=0x402494b8, arg=0x402844e0, kw=<value optimized out>) at ../Python/ceval.c:3481
#34 0x0008e050 in PyEval_EvalFrameEx (f=0x141918, throwflag=<value optimized out>) at ../Python/ceval.c:2093
#35 0x00092720 in PyEval_EvalCodeEx (co=0x4027ff98, globals=<value optimized out>, locals=<value optimized out>, args=0x0, argcount=1, kws=0x92880, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:2875
#36 0x00092880 in PyEval_EvalCode (co=0x1a4030, globals=0x400242c0, locals=0x1) at ../Python/ceval.c:514
#37 0x000b0ca4 in run_mod (command=<value optimized out>, flags=<value optimized out>) at ../Python/pythonrun.c:1273
#38 PyRun_StringFlags (command=<value optimized out>, flags=<value optimized out>) at ../Python/pythonrun.c:1236
#39 PyRun_SimpleStringFlags (command=<value optimized out>, flags=<value optimized out>) at ../Python/pythonrun.c:900
#40 0x00018e74 in Py_Main (argc=3, argv=0xbec47814) at ../Modules/main.c:521
#41 0x0001879c in main (argc=1720368, argv=0x400242c0) at ../Modules/python.c:23
This renders python-xapian unusable on armel, thus severity important.
Upgrading to the version in sid (2.10.2-6) doesn't help.
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (600, 'testing')
Architecture: armel (armv5tel)
Kernel: Linux 2.6.33-rc5-flatty-ocf-1-00255-g5b8834f
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/dash
Versions of packages libc6 depends on:
ii libc-bin 2.10.2-2 GNU C Library: Binaries
ii libgcc1 1:4.4.2-9 GCC support library
libc6 recommends no packages.
Versions of packages libc6 suggests:
ii debconf [debconf-2.0] 1.5.28 Debian configuration management sy
pn glibc-doc <none> (no description available)
ii locales 2.10.2-2 GNU C Library: National Language (
-- debconf information:
glibc/upgrade: true
* glibc/restart-services: rsync exim4 cron atd
glibc/disable-screensaver:
glibc/restart-failed:
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