D
```
```
Thread 5 "accel-pppd" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff62c0700 (LWP 8335)]
0x00007ffff7fc31ab in __list_del (prev=0x0, next=0x0) at /opt/18042021/accel-ppp/accel-pppd/triton/list.h:85
85 next->prev = prev;
(gdb)
(gdb)
(gdb)
(gdb)
(gdb) bt full
#0 0x00007ffff7fc31ab in __list_del (prev=0x0, next=0x0) at /opt/18042021/accel-ppp/accel-pppd/triton/list.h:85
No locals.
#1 0x00007ffff7fc3206 in list_del (entry=0x5555555abb18) at /opt/18042021/accel-ppp/accel-pppd/triton/list.h:96
No locals.
#2 0x00007ffff7fc37c1 in triton_thread (thread=0x555556c41a58) at /opt/18042021/accel-ppp/accel-pppd/triton/triton.c:145
set = {__val = {516, 0 <repeats 15 times>}}
sig = 10
need_free = 0
stack = 0x0
#3 0x00007ffff7f8eea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
ret = <optimized out>
pd = <optimized out>
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140737323468544, 3250119064688289587, 140737488349214, 140737488349215, 140737323466368, 1056768, -3250101094604839117, -3250101533213038797}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {
prev = 0x0, cleanup = 0x0, canceltype = 0}}}
not_first_call = 0
#4 0x00007ffff78bcdef in clone () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.```