[Ngspice-devel] pss crashes after converging

[Shouri C. <sh...@ee...>]

Hi,

I am trying to use the pss experimental analysis. I have been trying both,
with ngspice-24, as well as the git version.

The test circuit is a quad coupled oscillator (like the one in the pss
examples folder, but with different l, c etc values and bsim3 MOS models.)

The pss analysis converges and then, before giving me the prompt, crashes:

Convergence reached. Final circuit time is 1.263414241e-08 s and predicted
fundamental frequency is 3.87808e+09 Hz.
----------------

throwing out permanent breakpoint times <= current time (brk pt: 1.26341e-08)
ckt_time: 1.26341e-08    ckt_min_break: 1.25e-18
throwing out permanent breakpoint times <= current time (brk pt: 1.2892e-08)
ckt_time: 1.2892e-08    ckt_min_break: 1.25e-18


No. of Data Rows : 1024


No. of Data Rows : 11
*** glibc detected *** ngspice: double free or corruption (!prev):
0x000000000408bd20 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x7e626)[0x7fdabc7a5626]

followed by a lengthy backtrace.

I have used gdb to find out what is going on:
The crash occurs in the function plotAddRealValue (frontend/outitf.c).
After going through this function several times (roughly 8*1024 times),
the function for the first time enters the section with the "real parading
as a VF_COMPLEX". As soon as the TREALLOC is attempted, the program
crashes.

Let me know what I can do to help debug this further, or to clean this up.

Shouri


_________

Asst Professor
Department of Electrical Engineering
IIT Delhi, Hauz Khas
New Delhi 110016, India