# Various (possible) problems of aarch64
Here a list of possible problems of NetBSD/evbarm aarch64 that needs further
investigation in order to write proper PR or better yet to fix them!
## `mpv` SIGSEGVs (strnlen(s, (size_t)-1) always returns -1)
**UPDATE**: This was fixed by `<ryo>`, thanks!
Just by invoking `mpv` via:
% mpv
It SEGV as follows:
% mpv
/usr/pkg/lib/ffmpeg4/libavcodec.so.58: text relocations
mpv 0.29.0 Copyright © 2000-2018 mpv/MPlayer/mplayer2 projects
built on Sat Jul 28 21:02:57 CEST 2018
ffmpeg library versions:
libavutil 56.14.100
libavcodec 58.18.100
libavformat 58.12.100
libswscale 5.1.100
libavfilter 7.16.100
libswresample 3.1.100
ffmpeg version: 4.0.2
Usage: mpv [options] [url|path/]filename
Basic options:
--start=<time> seek to given (percent, seconds, or hh:mm:ss) position
--no-audio do not play sound
--no-video do not play video
--fs fullscreen playback
--sub-file=<file> specify subtitle file to use
--playlist=<file> specify playlist file
--list-options list all mpv options
--h=<string> print options which contain the given string in their name
[1] Segmentation fault (core dumped) /usr/pkg/bin/mpv...
% gdb -core mpv.core /usr/pkg/bin/mpv
Reading symbols from /usr/pkg/bin/mpv...done.
[New process 5]
[New process 6]
[New process 4]
[New process 3]
[New process 2]
[New process 1]
Core was generated by `mpv'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x0000f96f727f40b0 in memcpy () from /usr/lib/libc.so.12
[Current thread is 1 (process 5)]
(gdb) bt
#0 0x0000f96f727f40b0 in memcpy () from /usr/lib/libc.so.12
#1 0x00000002001cba34 in __memcpy_ichk (len=18446744073709551615, src=0xf96f6e10fec0, dst=<optimized out>)
at /usr/include/ssp/string.h:82
#2 strndup_append_at (str=str@entry=0xf96f6f4ff348, at=0, append=0xf96f6e10fec0 "speed", append_len=<optimized out>,
append_len@entry=18446744073709551615) at ../ta/ta_utils.c:113
#3 0x00000002001cbea4 in ta_strdup_append_buffer (str=str@entry=0xf96f6f4ff348, a=<optimized out>) at ../ta/ta_utils.c:165
#4 0x00000002001cb7b8 in ta_talloc_strdup_append_buffer (s=<optimized out>, s@entry=0x0, a=<optimized out>) at ../ta/ta_talloc.c:31
#5 0x0000000200157eec in print_str_list (opt=<optimized out>, src=<optimized out>) at ../options/m_option.c:1477
[...]
This happens because `strnlen(s, (size_t)-1)`, always returns -1, e.g.:
% cat strnlen_size_max.c
#include <stdio.h>
#include <string.h>
int
main(int argc, char *argv[])
{
int i;
for (i = 1; i < argc; i++) {
printf("strnlen(\"%s\", (size_t)-1) -> %ld\n",
argv[i], strnlen(argv[i], ~(size_t)0));
}
return 0;
}
% gcc -Wall strnlen_size_max.c
% ./a.out foo
strnlen("foo", (size_t)-1) -> -1
(This should returns 3, not -1!)
The following patch workaround the mpv problem by avoiding all
`strnlen(s, (size_t)-1)` calls (and just using strlen() instead):
$NetBSD: aarch64_problems.mdwn,v 1.12 2019/01/04 22:26:31 leot Exp $
Avoid to directly call:
strnlen(s, (size_t)-1)
because on aarch64 ATM it (incorrectly) always returns -1 (also
when s is a string with less than SIZE_MAX characters).
Add a kludge in order to use strlen() in these cases.
--- ta/ta_utils.c.orig 2018-07-31 21:45:47.492269366 +0000
+++ ta/ta_utils.c
@@ -98,7 +98,11 @@ static bool strndup_append_at(char **str
if (!*str && !append)
return true; // stays NULL, but not an OOM condition
- size_t real_len = append ? strnlen(append, append_len) : 0;
+ size_t real_len = append ?
+ append_len == (size_t)-1 ?
+ strlen(append) :
+ strnlen(append, append_len) :
+ 0;
if (append_len > real_len)
append_len = real_len;
## Python `import requests` SIGILLs
**UPDATE**: A kludge was added since py-cffi-1.11.5nb1 to avoid that.
Doing a (please note that also `python36` is affected):
$ python2.7 -c 'import requests'
Illegal instruction (core dumped)
Exit 132
...where:
% gdb -core python2.7.core `which python2.7`
Reading symbols from /usr/pkg/bin/python2.7...(no debugging symbols found)...done.
[New process 1]
Core was generated by `python2.7'.
Program terminated with signal SIGILL, Illegal instruction.
#0 0x0000f42f5fd00000 in ?? ()
(gdb) bt 5
#0 0x0000f42f5fd00000 in ?? ()
#1 0x0000f42f5fd0a3d0 in restore_errno_only () at c/misc_thread_common.h:43
#2 0x0000f42f5fbf0f90 in _cffi_f_SSL_library_init (self=<optimized out>, noarg=<optimized out>)
at build/temp.netbsd-8.99.22-evbarm-2.7/_openssl.c:51839
#3 0x0000f42f617606ac in PyEval_EvalFrameEx () from /usr/pkg/lib/libpython2.7.so.1.0
#4 0x0000f42f6175e5c0 in PyEval_EvalCodeEx () from /usr/pkg/lib/libpython2.7.so.1.0
(More stack frames follow...)
(gdb) f 2
#2 0x0000f42f5fbf0f90 in _cffi_f_SSL_library_init (self=<optimized out>, noarg=<optimized out>)
at build/temp.netbsd-8.99.22-evbarm-2.7/_openssl.c:51839
warning: Source file is more recent than executable.
51839 _cffi_restore_errno();
(gdb) list
51834 _cffi_f_SSL_library_init(PyObject *self, PyObject *noarg)
51835 {
51836 int result;
51837
51838 Py_BEGIN_ALLOW_THREADS
51839 _cffi_restore_errno();
51840 { result = SSL_library_init(); }
51841 _cffi_save_errno();
51842 Py_END_ALLOW_THREADS
51843
(gdb) f 1
#1 0x0000f42f5fd0a3d0 in restore_errno_only () at c/misc_thread_common.h:43
43 static void restore_errno_only(void) { errno = cffi_saved_errno; }
(gdb) list
38 syntactically valid to use "__thread" with this C compiler. */
39 #ifdef USE__THREAD
40
41 static __thread int cffi_saved_errno = 0;
42 static void save_errno_only(void) { cffi_saved_errno = errno; }
43 static void restore_errno_only(void) { errno = cffi_saved_errno; }
44
45 #else
46
47 static void save_errno_only(void)
(gdb) disas
Dump of assembler code for function restore_errno_only:
0x0000f42f5fd0a3b0 <+0>: str x30, [sp, #-16]!
0x0000f42f5fd0a3b4 <+4>: bl 0xf42f5fd075c0 <__errno@plt>
0x0000f42f5fd0a3b8 <+8>: mov x2, x0
0x0000f42f5fd0a3bc <+12>: mrs x1, tpidr_el0
0x0000f42f5fd0a3c0 <+16>: adrp x0, 0xf42f5fd34000
0x0000f42f5fd0a3c4 <+20>: ldr x3, [x0, #4088]
0x0000f42f5fd0a3c8 <+24>: add x0, x0, #0xff8
0x0000f42f5fd0a3cc <+28>: blr x3
=> 0x0000f42f5fd0a3d0 <+32>: ldr w0, [x1, x0]
0x0000f42f5fd0a3d4 <+36>: str w0, [x2]
0x0000f42f5fd0a3d8 <+40>: ldr x30, [sp], #16
0x0000f42f5fd0a3dc <+44>: ret
End of assembler dump.
(gdb) info reg
x0 0xf42f5fd34ff8 268484308324344
x1 0xf42f61875080 268484336898176
x2 0xf42f6186c848 268484336863304
x3 0xf42f5fd00000 268484308107264
x4 0xf42f5ff3c0b8 268484310450360
x5 0xf42f60000570 268484311254384
x6 0x65000000000000 28428972647776256
x7 0x65 101
x8 0xf42f6185e000 268484336803840
x9 0xf42f6185e668 268484336805480
x10 0xf42f6185e668 268484336805480
x11 0x1 1
x12 0x30 48
x13 0xffffff9264f0 281474969527536
x14 0x65 101
x15 0x3 3
x16 0xf42f615bd730 268484334049072
x17 0xf42f615ec2c8 268484334240456
x18 0xf42f615ca1a0 268484334100896
x19 0xf42f5fc9cea8 268484307701416
x20 0xf42f5fd9c3c0 268484308747200
x21 0xf42f61307090 268484331204752
x22 0xf42f5fcd38e8 268484307925224
x23 0xf42f5fcd10a0 268484307914912
x24 0xf42f5fb8c5a8 268484306585000
x25 0xf42f5fd9c3c0 268484308747200
x26 0xf42f5fbf0f70 268484306997104
x27 0xf42f5fdd467e 268484308977278
x28 0xf42f61307090 268484331204752
x29 0x0 0
x30 0xf42f5fd0a3d0 268484308149200
sp 0xffffff926760 0xffffff926760
pc 0xf42f5fd0a3d0 0xf42f5fd0a3d0 <restore_errno_only+32>
cpsr 0x60000000 [ EL=0 C Z ]
fpsr 0x3000000 50331648
fpcr 0x10 16
(gdb) quit
...and `_cffi_restore_errno` and `_cffi_save_errno` are defined in
`cffi/_cffi_include.h` as follows:
#define _cffi_restore_errno \
((void(*)(void))_cffi_exports[13])
#define _cffi_save_errno \
((void(*)(void))_cffi_exports[14])
Since py-cffi-1.11.5nb1 a kludge to workaround the issue is present (by
disabling __thread).
## polkitd crashes
pinebook# /usr/pkg/lib/polkit-1/polkitd
Successfully changed to user polkitd
Error loading /var/run/ConsoleKit/database: Error statting file /var/run/ConsoleKit/database: No such file or directory[1] Segmentation fault /usr/pkg/lib/polkit-1/polkitd