1: # Various (possible) problems of aarch64
2:
3: Here a list of possible problems of NetBSD/evbarm aarch64 that needs further
4: investigation in order to write proper PR or better yet to fix them!
5:
6:
7: ## `mpv` SIGSEGVs (strnlen(s, (size_t)-1) always returns -1)
8:
9: **UPDATE**: This was fixed by `<ryo>`, thanks!
10:
11: Just by invoking `mpv` via:
12:
13: % mpv
14:
15: It SEGV as follows:
16:
17: % mpv
18: /usr/pkg/lib/ffmpeg4/libavcodec.so.58: text relocations
19: mpv 0.29.0 Copyright © 2000-2018 mpv/MPlayer/mplayer2 projects
20: built on Sat Jul 28 21:02:57 CEST 2018
21: ffmpeg library versions:
22: libavutil 56.14.100
23: libavcodec 58.18.100
24: libavformat 58.12.100
25: libswscale 5.1.100
26: libavfilter 7.16.100
27: libswresample 3.1.100
28: ffmpeg version: 4.0.2
29:
30: Usage: mpv [options] [url|path/]filename
31:
32: Basic options:
33: --start=<time> seek to given (percent, seconds, or hh:mm:ss) position
34: --no-audio do not play sound
35: --no-video do not play video
36: --fs fullscreen playback
37: --sub-file=<file> specify subtitle file to use
38: --playlist=<file> specify playlist file
39:
40: --list-options list all mpv options
41: --h=<string> print options which contain the given string in their name
42:
43: [1] Segmentation fault (core dumped) /usr/pkg/bin/mpv...
44: % gdb -core mpv.core /usr/pkg/bin/mpv
45: Reading symbols from /usr/pkg/bin/mpv...done.
46: [New process 5]
47: [New process 6]
48: [New process 4]
49: [New process 3]
50: [New process 2]
51: [New process 1]
52: Core was generated by `mpv'.
53: Program terminated with signal SIGSEGV, Segmentation fault.
54: #0 0x0000f96f727f40b0 in memcpy () from /usr/lib/libc.so.12
55: [Current thread is 1 (process 5)]
56: (gdb) bt
57: #0 0x0000f96f727f40b0 in memcpy () from /usr/lib/libc.so.12
58: #1 0x00000002001cba34 in __memcpy_ichk (len=18446744073709551615, src=0xf96f6e10fec0, dst=<optimized out>)
59: at /usr/include/ssp/string.h:82
60: #2 strndup_append_at (str=str@entry=0xf96f6f4ff348, at=0, append=0xf96f6e10fec0 "speed", append_len=<optimized out>,
61: append_len@entry=18446744073709551615) at ../ta/ta_utils.c:113
62: #3 0x00000002001cbea4 in ta_strdup_append_buffer (str=str@entry=0xf96f6f4ff348, a=<optimized out>) at ../ta/ta_utils.c:165
63: #4 0x00000002001cb7b8 in ta_talloc_strdup_append_buffer (s=<optimized out>, s@entry=0x0, a=<optimized out>) at ../ta/ta_talloc.c:31
64: #5 0x0000000200157eec in print_str_list (opt=<optimized out>, src=<optimized out>) at ../options/m_option.c:1477
65: [...]
66:
67: This happens because `strnlen(s, (size_t)-1)`, always returns -1, e.g.:
68:
69: % cat strnlen_size_max.c
70: #include <stdio.h>
71: #include <string.h>
72:
73:
74: int
75: main(int argc, char *argv[])
76: {
77: int i;
78: for (i = 1; i < argc; i++) {
79: printf("strnlen(\"%s\", (size_t)-1) -> %ld\n",
80: argv[i], strnlen(argv[i], ~(size_t)0));
81: }
82:
83: return 0;
84: }
85: % gcc -Wall strnlen_size_max.c
86: % ./a.out foo
87: strnlen("foo", (size_t)-1) -> -1
88:
89: (This should returns 3, not -1!)
90:
91: The following patch workaround the mpv problem by avoiding all
92: `strnlen(s, (size_t)-1)` calls (and just using strlen() instead):
93:
94: $NetBSD: aarch64_problems.mdwn,v 1.12 2019/01/04 22:26:31 leot Exp $
95:
96: Avoid to directly call:
97:
98: strnlen(s, (size_t)-1)
99:
100: because on aarch64 ATM it (incorrectly) always returns -1 (also
101: when s is a string with less than SIZE_MAX characters).
102:
103: Add a kludge in order to use strlen() in these cases.
104:
105: --- ta/ta_utils.c.orig 2018-07-31 21:45:47.492269366 +0000
106: +++ ta/ta_utils.c
107: @@ -98,7 +98,11 @@ static bool strndup_append_at(char **str
108: if (!*str && !append)
109: return true; // stays NULL, but not an OOM condition
110:
111: - size_t real_len = append ? strnlen(append, append_len) : 0;
112: + size_t real_len = append ?
113: + append_len == (size_t)-1 ?
114: + strlen(append) :
115: + strnlen(append, append_len) :
116: + 0;
117: if (append_len > real_len)
118: append_len = real_len;
119:
120:
121: ## Python `import requests` SIGILLs
122:
123: **UPDATE**: A kludge was added since py-cffi-1.11.5nb1 to avoid that.
124: Doing a (please note that also `python36` is affected):
125:
126: $ python2.7 -c 'import requests'
127: Illegal instruction (core dumped)
128: Exit 132
129:
130: ...where:
131:
132: % gdb -core python2.7.core `which python2.7`
133: Reading symbols from /usr/pkg/bin/python2.7...(no debugging symbols found)...done.
134: [New process 1]
135: Core was generated by `python2.7'.
136: Program terminated with signal SIGILL, Illegal instruction.
137: #0 0x0000f42f5fd00000 in ?? ()
138: (gdb) bt 5
139: #0 0x0000f42f5fd00000 in ?? ()
140: #1 0x0000f42f5fd0a3d0 in restore_errno_only () at c/misc_thread_common.h:43
141: #2 0x0000f42f5fbf0f90 in _cffi_f_SSL_library_init (self=<optimized out>, noarg=<optimized out>)
142: at build/temp.netbsd-8.99.22-evbarm-2.7/_openssl.c:51839
143: #3 0x0000f42f617606ac in PyEval_EvalFrameEx () from /usr/pkg/lib/libpython2.7.so.1.0
144: #4 0x0000f42f6175e5c0 in PyEval_EvalCodeEx () from /usr/pkg/lib/libpython2.7.so.1.0
145: (More stack frames follow...)
146: (gdb) f 2
147: #2 0x0000f42f5fbf0f90 in _cffi_f_SSL_library_init (self=<optimized out>, noarg=<optimized out>)
148: at build/temp.netbsd-8.99.22-evbarm-2.7/_openssl.c:51839
149: warning: Source file is more recent than executable.
150: 51839 _cffi_restore_errno();
151: (gdb) list
152: 51834 _cffi_f_SSL_library_init(PyObject *self, PyObject *noarg)
153: 51835 {
154: 51836 int result;
155: 51837
156: 51838 Py_BEGIN_ALLOW_THREADS
157: 51839 _cffi_restore_errno();
158: 51840 { result = SSL_library_init(); }
159: 51841 _cffi_save_errno();
160: 51842 Py_END_ALLOW_THREADS
161: 51843
162: (gdb) f 1
163: #1 0x0000f42f5fd0a3d0 in restore_errno_only () at c/misc_thread_common.h:43
164: 43 static void restore_errno_only(void) { errno = cffi_saved_errno; }
165: (gdb) list
166: 38 syntactically valid to use "__thread" with this C compiler. */
167: 39 #ifdef USE__THREAD
168: 40
169: 41 static __thread int cffi_saved_errno = 0;
170: 42 static void save_errno_only(void) { cffi_saved_errno = errno; }
171: 43 static void restore_errno_only(void) { errno = cffi_saved_errno; }
172: 44
173: 45 #else
174: 46
175: 47 static void save_errno_only(void)
176: (gdb) disas
177: Dump of assembler code for function restore_errno_only:
178: 0x0000f42f5fd0a3b0 <+0>: str x30, [sp, #-16]!
179: 0x0000f42f5fd0a3b4 <+4>: bl 0xf42f5fd075c0 <__errno@plt>
180: 0x0000f42f5fd0a3b8 <+8>: mov x2, x0
181: 0x0000f42f5fd0a3bc <+12>: mrs x1, tpidr_el0
182: 0x0000f42f5fd0a3c0 <+16>: adrp x0, 0xf42f5fd34000
183: 0x0000f42f5fd0a3c4 <+20>: ldr x3, [x0, #4088]
184: 0x0000f42f5fd0a3c8 <+24>: add x0, x0, #0xff8
185: 0x0000f42f5fd0a3cc <+28>: blr x3
186: => 0x0000f42f5fd0a3d0 <+32>: ldr w0, [x1, x0]
187: 0x0000f42f5fd0a3d4 <+36>: str w0, [x2]
188: 0x0000f42f5fd0a3d8 <+40>: ldr x30, [sp], #16
189: 0x0000f42f5fd0a3dc <+44>: ret
190: End of assembler dump.
191: (gdb) info reg
192: x0 0xf42f5fd34ff8 268484308324344
193: x1 0xf42f61875080 268484336898176
194: x2 0xf42f6186c848 268484336863304
195: x3 0xf42f5fd00000 268484308107264
196: x4 0xf42f5ff3c0b8 268484310450360
197: x5 0xf42f60000570 268484311254384
198: x6 0x65000000000000 28428972647776256
199: x7 0x65 101
200: x8 0xf42f6185e000 268484336803840
201: x9 0xf42f6185e668 268484336805480
202: x10 0xf42f6185e668 268484336805480
203: x11 0x1 1
204: x12 0x30 48
205: x13 0xffffff9264f0 281474969527536
206: x14 0x65 101
207: x15 0x3 3
208: x16 0xf42f615bd730 268484334049072
209: x17 0xf42f615ec2c8 268484334240456
210: x18 0xf42f615ca1a0 268484334100896
211: x19 0xf42f5fc9cea8 268484307701416
212: x20 0xf42f5fd9c3c0 268484308747200
213: x21 0xf42f61307090 268484331204752
214: x22 0xf42f5fcd38e8 268484307925224
215: x23 0xf42f5fcd10a0 268484307914912
216: x24 0xf42f5fb8c5a8 268484306585000
217: x25 0xf42f5fd9c3c0 268484308747200
218: x26 0xf42f5fbf0f70 268484306997104
219: x27 0xf42f5fdd467e 268484308977278
220: x28 0xf42f61307090 268484331204752
221: x29 0x0 0
222: x30 0xf42f5fd0a3d0 268484308149200
223: sp 0xffffff926760 0xffffff926760
224: pc 0xf42f5fd0a3d0 0xf42f5fd0a3d0 <restore_errno_only+32>
225: cpsr 0x60000000 [ EL=0 C Z ]
226: fpsr 0x3000000 50331648
227: fpcr 0x10 16
228: (gdb) quit
229:
230: ...and `_cffi_restore_errno` and `_cffi_save_errno` are defined in
231: `cffi/_cffi_include.h` as follows:
232:
233: #define _cffi_restore_errno \
234: ((void(*)(void))_cffi_exports[13])
235: #define _cffi_save_errno \
236: ((void(*)(void))_cffi_exports[14])
237:
238: Since py-cffi-1.11.5nb1 a kludge to workaround the issue is present (by
239: disabling __thread).
240:
241:
242: ## polkitd crashes
243:
244: pinebook# /usr/pkg/lib/polkit-1/polkitd
245: Successfully changed to user polkitd
246: 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
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