It turns out that /usr/local/bin/gdb crashing 
for the clang-built powerpc64 world is again
due to C++ exceptions being thrown, this time
in gdb80 itself.

This helps explain why for clang-based buildworld
experiments /usr/libexec/gdb is a better alternative
currently for the powerpc families.

Again the _Unwind_SetGR use in __gxx_personality_v0

# ls -lT /usr/local/bin/gdb*
lrwxr-xr-x  1 root  wheel         5 Sep 29 15:25:15 2017 /usr/local/bin/gdb -> 
-r-xr-xr-x  1 root  wheel  97577168 Sep 29 15:25:15 2017 /usr/local/bin/gdb80
lrwxr-xr-x  1 root  wheel         5 Sep 29 15:25:15 2017 
/usr/local/bin/gdbtui80 -> gdb80

# ldd /usr/local/bin/gdb80 
/usr/local/bin/gdb80: => /usr/local/lib/ (0x50e80000) => /lib/ (0x50ef7000) => /lib/ (0x50f61000) => /lib/ (0x50f83000) => /lib/ (0x50fad000) => /usr/local/lib/ (0x50fe5000) => /usr/lib/ (0x5102a000) => /usr/lib/ (0x5105d000) => /lib/ (0x5118a000) => /lib/ (0x511b1000) => /lib/ (0x511d6000) => /lib/ (0x51528000) => /lib/ (0x515ac000) => /lib/ (0x515da000)

# /usr/libexec/gdb /usr/local/bin/gdb80 /var/crash/gdb80.14502.core 
. . .
Core was generated by `/usr/local/bin/gdb 
Program terminated with signal 11, Segmentation fault.
. . .
(gdb) bt
#0  0x00000000511b5c20 in _Unwind_SetGR (context=<value optimized out>, 
index=<value optimized out>, val=1374378080) at unwind-dw2-fde.h:162
#1  0x000000005119f194 in __gxx_personality_v0 (version=<value optimized out>, 
actions=<value optimized out>, exceptionClass=<value optimized out>, 
    context=0xffffffffffffb420) at /usr/src/contrib/libcxxrt/
#2  0x00000000511b6a60 in _Unwind_RaiseException_Phase2 (exc=0x51eb5860, 
context=0xffffffffffffb420) at
#3  0x00000000511b6548 in _Unwind_RaiseException (exc=<value optimized out>) at
#4  0x000000005119e4f4 in __cxa_throw (thrown_exception=<value optimized out>, 
tinfo=<value optimized out>, dest=<value optimized out>) at 
#5  0x00000000102be040 in throw_exception () at common-exceptions.c:303
#6  0x00000000102be1dc in throw_it (reason=1374378080, error=4294947872, 
fmt=<value optimized out>, ap=<value optimized out>) at common-exceptions.c:373
#7  0x00000000102be0a4 in throw_verror (error=<value optimized out>, fmt=<value 
optimized out>, ap=<value optimized out>) at common-exceptions.c:379
#8  0x00000000102be258 in throw_error (error=GDB_NO_ERROR, fmt=0x18 <Address 
0x18 out of bounds>) at common-exceptions.c:394
#9  0x0000000010279bf8 in call_site_for_pc (gdbarch=<value optimized out>, 
pc=<value optimized out>) at block.c:241
#10 0x00000000102e93e0 in call_site_find_chain (gdbarch=<value optimized out>, 
caller_pc=<value optimized out>, callee_pc=<value optimized out>) at 
#11 0x00000000102e4800 in dwarf2_tailcall_sniffer_first (this_frame=0x51eb5808, 
tailcall_cachep=0x51eb5860, entry_cfa_sp_offsetp=0xffffffffffffb420) at 
#12 0x00000000102e32b8 in ._ZL26dwarf2_frame_prev_registerP10frame_infoPPvi () 
at __split_buffer:311
#13 0x0000000010340464 in frame_unwind_register_value (frame=<value optimized 
out>, regnum=<value optimized out>) at frame.c:1200
#14 0x0000000010340148 in frame_register_unwind (frame=0x0, regnum=<value 
optimized out>, optimizedp=0x51eb5860, unavailablep=0x51eb5808, 
lvalp=0x514077a0, addrp=0x51eb5808, realnump=0x6, 
    bufferp=0xffffffffffffb420 "") at frame.c:1102
#15 0x0000000010341ddc in get_prev_frame_always_1 
(this_frame=0xffffffffffffb420) at frame.c:1840
#16 0x000000001033e878 in get_prev_frame_always (this_frame=0xffffffffffffb420) 
at frame.c:2092
#17 0x000000001033e110 in get_prev_frame (this_frame=0xffffffffffffb420) at 
#18 0x0000000010419464 in backtrace_command (arg=<value optimized out>, 
from_tty=1374378080) at stack.c:1830
#19 0x00000000101e3654 in do_cfunc (c=<value optimized out>, args=0x0, 
from_tty=24) at cli/cli-decode.c:106
#20 0x00000000101e67b0 in cmd_func (cmd=0x0, args=0x18 <Address 0x18 out of 
bounds>, from_tty=<value optimized out>) at cli/cli-decode.c:1896
#21 0x000000001046497c in execute_command (p=<value optimized out>, 
from_tty=1374377992) at top.c:674
#22 0x000000001032e398 in command_handler (command=0xffffffffffffb420 "") at 
#23 0x000000001032e788 in command_line_handler (rl=<value optimized out>) at 
#24 0x000000001032dc54 in gdb_rl_callback_handler (rl=<value optimized out>) at 
#25 0x0000000050ec5950 in rl_callback_read_char () at ../callback.c:283
#26 0x000000001032f560 in gdb_rl_callback_read_char_wrapper_noexcept () at 
#27 0x000000001032d84c in gdb_rl_callback_read_char_wrapper (client_data=<value 
optimized out>) at event-top.c:192
#28 0x000000001032e14c in stdin_event_handler (error=<value optimized out>, 
client_data=0xffffffffffffb420) at event-top.c:518
#29 0x000000001032d690 in handle_file_event (file_ptr=0xffffffffffffb420, 
ready_mask=1374378080) at event-loop.c:733
#30 0x000000001032c830 in gdb_wait_for_event (block=<value optimized out>) at 
#31 0x000000001032c2c4 in gdb_do_one_event () at event-loop.c:347
#32 0x000000001032c940 in start_event_loop () at event-loop.c:371
#33 0x00000000103a674c in captured_command_loop (data=<value optimized out>) at 
#34 0x000000001032fd50 in catch_errors (func=<value optimized out>, 
func_args=0x6, errstring=0xffffffffffffb420 "", mask=1374377992) at 
#35 0x00000000103a61b4 in gdb_main (args=<value optimized out>) at main.c:1150
#36 0x000000001000bc38 in main (argc=<value optimized out>, 
argv=0xffffffffffffb420) at gdb.c:38
#37 0x000000001000b938 in _start (argc=1374377992, argv=0x51eb5860, 
env=0xffffffffffffb420, obj=<value optimized out>, cleanup=<value optimized 
out>, ps_strings=<value optimized out>)
    at /usr/src/lib/csu/powerpc64/crt1.c:94
#38 0x0000000050e49b70 in .text () at 
Current language:  auto; currently minimal

Mark Millard
markmi at

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