#0  0x00007f01b2549550 in __read_nocancel () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x0000559bf70343d3 in flush_timer ()
No symbol table info available.
#2  0x0000559bf7035b40 in sd_event_wait ()
No symbol table info available.
#3  0x0000559bf6fe3b3a in main ()
No symbol table info available.