# Nginx segfaulting when used with set-misc (for Authelia) **URL:** https://discourse.nixos.org/t/nginx-segfaulting-when-used-with-set-misc-for-authelia/79963 **Category:** Guides **Created:** [September 6, 2026, 3:47pm UTC](https://discourse.nixos.org/t/nginx-segfaulting-when-used-with-set-misc-for-authelia/79963 "2026-09-06T15:47:14Z") **Posts on this page:** 1 **Page:** 1

### Author: ![korfuri](https://discourse.nixos.org/user_avatar/discourse.nixos.org/korfuri/32/6837_2.png) [@korfuri](https://discourse.nixos.org/u/korfuri) #### Post date: [September 6, 2026, 3:47pm UTC](https://discourse.nixos.org/t/nginx-segfaulting-when-used-with-set-misc-for-authelia/79963/1 "2026-09-06T15:47:14Z")

Not quite a guide, but I figure if I post it here it may give people a chance to find it if they face the same issue. If you: - Are using nixos on the unstable channel, and - Are using nginx with Authelia, and - Have configured your Authelia setup a while ago, with the `set-misc` nginx plugin to handle redirects (as it was recommended at the time), You may see nginx segfaulting, like so: ```auto [🡕] Process 5993 (nginx) of user 60 dumped core. Module libexslt.so.0 without build-id. Module libxslt.so.1 without build-id. Module libxml2.so.16 without build-id. Module libz.so.1 without build-id. Module libpcre2-8.so.0 without build-id. Module libcrypt.so.2 without build-id. Module nginx without build-id. Stack trace of thread 5993: #0 0x00005c6d7f086ec0 ngx_escape_uri_patched (nginx + 0x16bec0) #1 0x00005c6d7f086fee ngx_http_set_misc_escape_uri (nginx + 0x16bfee) #2 0x00005c6d7f084f20 ndk_set_var_value_code (nginx + 0x169f20) #3 0x00005c6d7f00bc0f ngx_http_rewrite_handler (nginx + 0xf0c0f) #4 0x00005c6d7efb318d ngx_http_core_rewrite_phase (nginx + 0x9818d) #5 0x00005c6d7efae07c ngx_http_core_run_phases (nginx + 0x9307c) #6 0x00005c6d7efae13e ngx_http_handler (nginx + 0x9313e) #7 0x00005c6d7efb9ec3 ngx_http_process_request (nginx + 0x9eec3) #8 0x00005c6d7eff3351 ngx_http_v2_state_header_complete (nginx + 0xd8351) #9 0x00005c6d7eff3f9d ngx_http_v2_state_process_header (nginx + 0xd8f9d) #10 0x00005c6d7eff41da ngx_http_v2_state_field_huff (nginx + 0xd91da) #11 0x00005c6d7eff4439 ngx_http_v2_state_field_len (nginx + 0xd9439) #12 0x00005c6d7eff46ab ngx_http_v2_state_header_block (nginx + 0xd96ab) #13 0x00005c6d7eff1b37 ngx_http_v2_read_handler (nginx + 0xd6b37) #14 0x00005c6d7eff1fae ngx_http_v2_init (nginx + 0xd6fae) #15 0x00005c6d7efbb4c3 ngx_http_ssl_handshake_handler (nginx + 0xa04c3) #16 0x00005c6d7ef8ce08 ngx_ssl_handshake_handler (nginx + 0x71e08) #17 0x00005c6d7ef868a6 ngx_epoll_process_events (nginx + 0x6b8a6) #18 0x00005c6d7ef7be4b ngx_process_events_and_timers (nginx + 0x60e4b) #19 0x00005c6d7ef84aef ngx_worker_process_cycle (nginx + 0x69aef) #20 0x00005c6d7ef82e59 ngx_spawn_process (nginx + 0x67e59) #21 0x00005c6d7ef85567 ngx_master_process_cycle (nginx + 0x6a567) #22 0x00005c6d7ef589c0 main (nginx + 0x3d9c0) #23 0x000071937c22b285 __libc_start_call_main (libc.so.6 + 0x2b285) #24 0x000071937c22b338 __libc_start_main@@GLIBC_2.34 (libc.so.6 + 0x2b338) #25 0x00005c6d7ef56ea5 _start (nginx + 0x3bea5) ELF object binary architecture: AMD x86-64 ``` This is caused by the `set-misc` plugin and, it seems, some ABI changes in nginx. I was going to look up those ABI changes and try to fix it, but it turns out the [recommended way](https://www.authelia.com/integration/proxies/nginx/#authelia-authrequestconf) of configuring nginx to authenticate requests via Authelia has changed and you don’t need the set-misc and develkit plugins anymore. You can simply replace: ```auto set_escape_uri $target_url $scheme://$host$request_uri; error_page 401 =302 https://auth.example.com/?rd=$target_url; ``` with: ```auto auth_request_set $redirection_url $upstream_http_location; error_page 401 =302 $redirection_url; ``` and remove `pkgs.nginxModules.develkit` and `pkgs.nginxModules.set-misc` from your `services.nginx.additionalModules` (unless you’re using them elsewhere).