I got following crash,

(gdb) where
title=0x7f6d4bf6f750 "master process ../objs/nginx -p /tmp/nginx-test-T8yhrruZvl -c nginx.conf") at src/os/unix/ngx_setproctitle.c:128
at src/os/unix/ngx_process_cycle.c:144
(gdb) up
title=0x7f6d4bf6f750 "master process ../objs/nginx -p /tmp/nginx-test-T8yhrruZvl -c nginx.conf") at src/os/unix/ngx_setproctitle.c:128
128 ngx_memset(p, NGX_SETPROCTITLE_PAD, ngx_os_argv_last - (char *) p);
(gdb) print ngx_os_argv_last
$3 = 0x0

If ngx_init_setproctitle fails for example when ngx_alloc fails, then
ngx_setproctitle crashes because ngx_os_argv_last is NULL.

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