Thanks a lot for the hints so far.. to provide the further info and answer
the questions..

getconf ARG_MAX shows 2097152
ulimit -s shows 8192
setting it to unlimited, doesn't change anything (also not with prlimit)
wc -c /proc/<pid>/environ shows 1949

it seems on a regular machine we have around 1200 listening sockets
and do indeed use "reuseport"

nginx -V shows
nginx version: nginx/1.18.0
built with OpenSSL 1.1.1j 16 Feb 2021
TLS SNI support enabled
configure arguments: --with-ipv6 --with-file-aio
--with-http_ssl_module --with-http_v2_module --with-http_realip_module
--with-http_stub_status_module --with-http_gzip_static_module
--with-http_sub_module --without-http_scgi_module --with-stream
--with-stream_ssl_module --with-stream_realip_module
--with-stream_geoip_module --with-stream_ssl_preread_module
--with-http_slice_module --add-module=../lua-nginx-module-0.10.15
--add-module=../headers-more-v0.25
--add-module=../ngx-devel-kit-master
--add-module=../dist/nginx-rtmp-module
--add-module=../build/nginx_upstream_check_module
--conf-path=/etc/nginx.conf --with-mail --with-mail_ssl_module
--without-mail_pop3_module --with-cc-opt='-D_FORTIFY_SOURCE=1
-fstack-protector -fstack-clash-protection -pipe -march=westmere
-mtune=intel -O3 -I/build/nginx/boringssl/.compat/include -g'
--with-ld-opt='-Wl,-z,relro,-z,now,-lgmp -ldl'



On Tue, Apr 27, 2021 at 12:35 PM Charlie Kilo <krikkiteer@gmail.com> wrote:

> Hi everyone,
> i'm trying to upgrade an nginx-binary while running.
> When i do kill -s USR2 <pid>, i get the following error in the logs..
>
> 11:40:38 [alert] 52701#0: execve() failed while executing new binary
> process "/opt/sbin/nginx" (7: Argument list too long)
>
> Anybody knows what exactly is in those arguments ? We have ~ 20-55 worker
> processes if that might be related..
> nginx-version is 1.18.0, os: debian buster
>
> thanks everyone in advance!
> chris
>
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