[Bug libgcc/69997] GCC5.3.0 _Unwind_ForcedUnwind Always Abort While pthread_exit

[tcliuqiang at msn dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69997

--- Comment #4 from Liu Qiang <tcliuqiang at msn dot com> ---
Hello everybody.

I build the powerpc64 crosstoolchain with removing the
'gcc_assert(code==URC_NO_REASON)', and run the new system built by it.  The
program (python3 with thread exiting) terminated by SIGSEGV instead of SIGABRT.
Can anyone help? 


Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x3fffb763b190 (LWP 1667)]
_Unwind_GetGR (index=65, context=0x3fffb7639e40) at
/develop/build/toolchain/src/gcc-4.9.3/libgcc/unwind-dw2.c:244
244     /develop/build/toolchain/src/gcc-4.9.3/libgcc/unwind-dw2.c: No such
file or directory.
(gdb) bt
#0  _Unwind_GetGR (index=65, context=0x3fffb7639e40) at
/develop/build/toolchain/src/gcc-4.9.3/libgcc/unwind-dw2.c:244
#1  frob_update_context (fs=0x3fffb7638ea0, context=0x3fffb7639e40) at
./md-unwind-support.h:335
#2  uw_update_context_1 (context=context@entry=0x3fffb7639e40,
fs=fs@entry=0x3fffb7638ea0) at
/develop/build/toolchain/src/gcc-4.9.3/libgcc/unwind-dw2.c:1494
#3  0x00003fffb6e249f0 in uw_init_context_1
(context=context@entry=0x3fffb7639e40,
outer_cfa=outer_cfa@entry=0x3fffb763a4f0, 
    outer_ra=0x3fffb7c92e04 <._Unwind_ForcedUnwind+164>) at
/develop/build/toolchain/src/gcc-4.9.3/libgcc/unwind-dw2.c:1587
#4  0x00003fffb6e25230 in _Unwind_ForcedUnwind (exc=0x3fffb763b600,
stop=@0x3fffb7ca9270: 0x3fffb7c8f8f0 <.unwind_stop>,
stop_argument=0x3fffb763a7e0)
    at /develop/build/toolchain/src/gcc-4.9.3/libgcc/unwind.inc:201
#5  0x00003fffb7c92e04 in ._Unwind_ForcedUnwind () from /lib/libpthread.so.0
#6  0x00003fffb7c8fb08 in .__pthread_unwind () from /lib/libpthread.so.0
#7  0x00003fffb7c84e1c in .pthread_exit () from /lib/libpthread.so.0
#8  0x00003fffb7e78044 in PyThread_exit_thread () at
Python/thread_pthread.h:266
#9  0x00003fffb7e7e888 in t_bootstrap (boot_raw=0x10115740) at
./Modules/_threadmodule.c:1023
#10 0x00003fffb7c83af0 in .start_thread () from /lib/libpthread.so.0
#11 0x00003fffb7ad4024 in .__clone () from /lib/libc.so.6
(gdb) info registers 
r0             0x570    1392
r1             0x3fffb76387f0   70367525963760
r2             0x3fffb6e43030   70367517618224
r3             0x3fffb7638860   70367525963872
r4             0x0      0
r5             0x3fffb6e25230   70367517495856
r6             0x3fffb6e3b770   70367517587312
r7             0x7fc4f378       2143613816
r8             0x8      8
r9             0x4000000000000000       4611686018427387904
r10            0x0      0
r11            0x3fffb763a3b0   70367525970864
r12            0x3fffb7639e40   70367525969472
r13            0x3fffb76428f0   70367526004976
r14            0x800000000000000        576460752303423488
r15            0x3fffb78fce60   70367528865376
r16            0x3fffb6e3c000   70367517589504
r17            0x3fffb763b250   70367525974608
r18            0x800000 8388608
r19            0x3fffb7ca8020   70367532711968
r20            0x10115740       269571904
r21            0x3fffffffeaf8   70368744172280
r22            0x3fffb763a4f0   70367525971184
r23            0x3fffb7639e40   70367525969472
r24            0x3fffb7638860   70367525963872
r25            0x3fffb763a3aa   70367525970858
r26            0x3fffb763a2d0   70367525970640
r27            0x92     146
r28            0x3fffb76397c0   70367525967808
r29            0x3fffb7638ea0   70367525965472
r30            0x0      0
r31            0x1      1
pc             0x3fffb6e23a24   0x3fffb6e23a24 <uw_update_context_1+1012>
msr            0x8002d000       2147667968
cr             0x44424422       1145193506
lr             0x3fffb6e23680   0x3fffb6e23680 <uw_update_context_1+80>
ctr            0x3fffb6e237d0   70367517489104
xer            0x0      0
orig_r3        0x3fffb6e3b804   70367517587460
trap           0x300    768
(gdb)