#
#
# export UNW_ARM_UNWIND_METHOD=0
# ./test1
Received signal 6
 backtrace returned 50 frames

[bt]: (0) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (1) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (2) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (3) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (4) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (5) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (6) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (7) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (8) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (9) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (10) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (11) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (12) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (13) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (14) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (15) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (16) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (17) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (18) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (19) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (20) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (21) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (22) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (23) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (24) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (25) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (26) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (27) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (28) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (29) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (30) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (31) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (32) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (33) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (34) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (35) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (36) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (37) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (38) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (39) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (40) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (41) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (42) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (43) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (44) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (45) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (46) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (47) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (48) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]
[bt]: (49) /usr/lib/libunwind.so.8(backtrace+0x48) [0xb6f8016c]

#
# export UNW_ARM_UNWIND_METHOD=1
# ./test1
Received signal 6
 backtrace returned 0 frames


#
#
# export UNW_ARM_UNWIND_METHOD=2
# ./test1
Received signal 6
Received signal 11
Segmentation fault (core dumped)
#
#
# export UNW_ARM_UNWIND_METHOD=3
# ./test
-sh: ./test: not found
# ./test1
Received signal 6
Received signal 11
Segmentation fault (core dumped)
#
#
#
# export UNW_ARM_UNWIND_METHOD=4
# ./test1
Received signal 6
 backtrace returned 3 frames

[bt]: (0) ./test1(_Z12do_backtracei+0x50) [0x8efc]
[bt]: (1) /lib/libc.so.6(__default_sa_restorer+0) [0xb6c21290]
[bt]: (2) /lib/libc.so.6(gsignal+0x34) [0xb6c1fff8]

#