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Annotation of wikisrc/users/leot/aarch64_problems.mdwn, revision 1.5

1.1       leot        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` and NetBSD crashes
                      8: Just by invoking `mpv` via:
                      9: 
1.2       leot       10:     $ mpv
1.1       leot       11: 
                     12: It is possible to completely crash NetBSD on aarch64. Investigate why and if
                     13: possible get a complete backtrace.
                     14: 
                     15: (Is it PaX MPROTECT related?)
                     16: 
                     17: 
                     18: ## Python `import requests` SIGILLs
                     19: Doing a (please note that also `python36` is affected):
                     20: 
1.2       leot       21:     $ python2.7 -c 'import requests'
                     22:     Illegal instruction (core dumped)
                     23:     Exit 132
1.1       leot       24: 
1.5     ! leot       25: ...where:
1.1       leot       26: 
1.5     ! leot       27:     % gdb -core python2.7.core `which python2.7`
        !            28:     Reading symbols from /usr/pkg/bin/python2.7...(no debugging symbols found)...done.
        !            29:     [New process 1]
        !            30:     Core was generated by `python2.7'.
        !            31:     Program terminated with signal SIGILL, Illegal instruction.
        !            32:     #0  0x0000f42f5fd00000 in ?? ()
        !            33:     (gdb) bt 5
        !            34:     #0  0x0000f42f5fd00000 in ?? ()
        !            35:     #1  0x0000f42f5fd0a3d0 in restore_errno_only () at c/misc_thread_common.h:43
        !            36:     #2  0x0000f42f5fbf0f90 in _cffi_f_SSL_library_init (self=<optimized out>, noarg=<optimized out>)
        !            37:         at build/temp.netbsd-8.99.22-evbarm-2.7/_openssl.c:51839
        !            38:     #3  0x0000f42f617606ac in PyEval_EvalFrameEx () from /usr/pkg/lib/libpython2.7.so.1.0
        !            39:     #4  0x0000f42f6175e5c0 in PyEval_EvalCodeEx () from /usr/pkg/lib/libpython2.7.so.1.0
        !            40:     (More stack frames follow...)
        !            41:     (gdb) f 2
        !            42:     #2  0x0000f42f5fbf0f90 in _cffi_f_SSL_library_init (self=<optimized out>, noarg=<optimized out>)
        !            43:         at build/temp.netbsd-8.99.22-evbarm-2.7/_openssl.c:51839
        !            44:     warning: Source file is more recent than executable.
        !            45:     51839     _cffi_restore_errno();
        !            46:     (gdb) list
        !            47:     51834   _cffi_f_SSL_library_init(PyObject *self, PyObject *noarg)
        !            48:     51835   {
        !            49:     51836     int result;
        !            50:     51837
        !            51:     51838     Py_BEGIN_ALLOW_THREADS
        !            52:     51839     _cffi_restore_errno();
        !            53:     51840     { result = SSL_library_init(); }
        !            54:     51841     _cffi_save_errno();
        !            55:     51842     Py_END_ALLOW_THREADS
        !            56:     51843
        !            57:     (gdb) f 1
        !            58:     #1  0x0000f42f5fd0a3d0 in restore_errno_only () at c/misc_thread_common.h:43
        !            59:     43      static void restore_errno_only(void) { errno = cffi_saved_errno; }
        !            60:     (gdb) list
        !            61:     38         syntactically valid to use "__thread" with this C compiler. */
        !            62:     39      #ifdef USE__THREAD
        !            63:     40
        !            64:     41      static __thread int cffi_saved_errno = 0;
        !            65:     42      static void save_errno_only(void) { cffi_saved_errno = errno; }
        !            66:     43      static void restore_errno_only(void) { errno = cffi_saved_errno; }
        !            67:     44
        !            68:     45      #else
        !            69:     46
        !            70:     47      static void save_errno_only(void)
        !            71:     (gdb) disas
        !            72:     Dump of assembler code for function restore_errno_only:
        !            73:        0x0000f42f5fd0a3b0 <+0>:     str     x30, [sp, #-16]!
        !            74:        0x0000f42f5fd0a3b4 <+4>:     bl      0xf42f5fd075c0 <__errno@plt>
        !            75:        0x0000f42f5fd0a3b8 <+8>:     mov     x2, x0
        !            76:        0x0000f42f5fd0a3bc <+12>:    mrs     x1, tpidr_el0
        !            77:        0x0000f42f5fd0a3c0 <+16>:    adrp    x0, 0xf42f5fd34000
        !            78:        0x0000f42f5fd0a3c4 <+20>:    ldr     x3, [x0, #4088]
        !            79:        0x0000f42f5fd0a3c8 <+24>:    add     x0, x0, #0xff8
        !            80:        0x0000f42f5fd0a3cc <+28>:    blr     x3
        !            81:     => 0x0000f42f5fd0a3d0 <+32>:    ldr     w0, [x1, x0]
        !            82:        0x0000f42f5fd0a3d4 <+36>:    str     w0, [x2]
        !            83:        0x0000f42f5fd0a3d8 <+40>:    ldr     x30, [sp], #16
        !            84:        0x0000f42f5fd0a3dc <+44>:    ret
        !            85:     End of assembler dump.
        !            86:     (gdb) info reg
        !            87:     x0             0xf42f5fd34ff8   268484308324344
        !            88:     x1             0xf42f61875080   268484336898176
        !            89:     x2             0xf42f6186c848   268484336863304
        !            90:     x3             0xf42f5fd00000   268484308107264
        !            91:     x4             0xf42f5ff3c0b8   268484310450360
        !            92:     x5             0xf42f60000570   268484311254384
        !            93:     x6             0x65000000000000 28428972647776256
        !            94:     x7             0x65     101
        !            95:     x8             0xf42f6185e000   268484336803840
        !            96:     x9             0xf42f6185e668   268484336805480
        !            97:     x10            0xf42f6185e668   268484336805480
        !            98:     x11            0x1      1
        !            99:     x12            0x30     48
        !           100:     x13            0xffffff9264f0   281474969527536
        !           101:     x14            0x65     101
        !           102:     x15            0x3      3
        !           103:     x16            0xf42f615bd730   268484334049072
        !           104:     x17            0xf42f615ec2c8   268484334240456
        !           105:     x18            0xf42f615ca1a0   268484334100896
        !           106:     x19            0xf42f5fc9cea8   268484307701416
        !           107:     x20            0xf42f5fd9c3c0   268484308747200
        !           108:     x21            0xf42f61307090   268484331204752
        !           109:     x22            0xf42f5fcd38e8   268484307925224
        !           110:     x23            0xf42f5fcd10a0   268484307914912
        !           111:     x24            0xf42f5fb8c5a8   268484306585000
        !           112:     x25            0xf42f5fd9c3c0   268484308747200
        !           113:     x26            0xf42f5fbf0f70   268484306997104
        !           114:     x27            0xf42f5fdd467e   268484308977278
        !           115:     x28            0xf42f61307090   268484331204752
        !           116:     x29            0x0      0
        !           117:     x30            0xf42f5fd0a3d0   268484308149200
        !           118:     sp             0xffffff926760   0xffffff926760
        !           119:     pc             0xf42f5fd0a3d0   0xf42f5fd0a3d0 <restore_errno_only+32>
        !           120:     cpsr           0x60000000       [ EL=0 C Z ]
        !           121:     fpsr           0x3000000        50331648
        !           122:     fpcr           0x10     16
        !           123:     (gdb) quit