Arch Linux

Description:

Running pgrep with -F and a pidfile fails:

$ cat ~/.pia_pid
2398

$ pgrep -F ~/.pia_pid
Segmentation fault (core dumped)

$ ps -ef | grep 239[8]
root 2398 2391 0 20:52 pts/1 00:00:00 myproc

$ gdb pgrep
GNU gdb (GDB) 8.1
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Reading symbols from pgrep...(no debugging symbols found)...done.
(gdb) r -F ~/.pia_pid
Starting program: /usr/bin/pgrep -F ~/.pia_pid
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x00005555555574d6 in ?? ()
(gdb) bt full
#0 0x00005555555574d6 in ?? ()
No symbol table info available.
#1 0x0000555555555d9e in ?? ()
No symbol table info available.
#2 0x00007ffff781cf4a in __libc_start_main () from /usr/lib/libc.so.6
No symbol table info available.
#3 0x000055555555624a in ?? ()
No symbol table info available.
(gdb) quit

Additional info:
* procps-ng 3.3.13-1


Steps to reproduce:

Write a PID into a file
Run pgrep -F $PIDFILE