# Segfault with Secure Download **URL:** \ **Category:** NGINX\ **Created:** [June 3, 2010, 3:43pm UTC](https://www.ruby-forum.com/t/segfault-with-secure-download/189585 "2010-06-03T15:43:16Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![MokuTheCow](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/51bf81/32.png) [@MokuTheCow](https://www.ruby-forum.com/u/MokuTheCow)\ **Post date:** [June 3, 2010, 3:43pm UTC](https://www.ruby-forum.com/t/segfault-with-secure-download/189585/1 "2010-06-03T15:43:16Z")
Hi; I’ve compiled in Secure Download to nginx 0.7.65 & 0.8.39 and whenever I make use of the Secure Download directives, the processes keep segfaulting. ```auto [size=small]Jun 3 04:04:03 localhost kernel: nginx[23299]: segfault at 1 ip 00000000004204ad sp 00007fffbda98228 error 4 in nginx[400000+6a000] Jun 3 04:04:03 localhost kernel: nginx[23298]: segfault at 1 ip 00000000004204ad sp 00007fffbda98228 error 4 in nginx[400000+6a000] Jun 3 04:04:03 localhost kernel: nginx[23285]: segfault at 1 ip 00000000004204ad sp 00007fffbda98228 error 4 in nginx[400000+6a000] Jun 3 04:04:03 localhost kernel: nginx[23291]: segfault at 1 ip 00000000004204ad sp 00007fffbda98228 error 4 in nginx[400000+6a000] Jun 3 04:04:03 localhost kernel: nginx[23301]: segfault at 1 ip 00000000004204ad sp 00007fffbda98228 error 4 in nginx[400000+6a000][/size] ``` The module creator says it’s been tested in 0.7.61, but we had it working for a period of time in 0.7.65 before the segfaults started, seemingly out of nowhere. Does anyone have any idea what could be causing this? I’m using Fedora Core 12 with bonding across three 1 gigabit interfaces. The server regularly pushes out 2.5+ gigabits of bandwidth - we have a good idea of what we are doing over here so technical responses are welcome. [sub]Linux version 2.6.32.11-99.fc12.x86\_64 (removed\_email\_address@domain.invalid) (gcc version 4.4.3 20100127 (Red Hat 4.4.3-4) (GCC) ) #1 SMP Mon Apr 5 19:59:38 UTC 2010[/sub] Thanks! Richard Posted at Nginx Forum: > **[Segfault with Secure Download](https://forum.nginx.org/read.php?2,94061,94061#msg-94061)** > > Hi; I've compiled in Secure Download to nginx 0.7.65 & 0.8.39 and whenever I make use of the Secure Download directives, the processes keep segfaulting. \[code\] \[size=small\]Jun 3 04:04:03 localhost kernel: nginx\[23299\]: segfault at 1 ip... ---
**Author:** ![MokuTheCow](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/51bf81/32.png) [@MokuTheCow](https://www.ruby-forum.com/u/MokuTheCow)\ **Post date:** [June 3, 2010, 4:01pm UTC](https://www.ruby-forum.com/t/segfault-with-secure-download/189585/2 "2010-06-03T16:01:25Z")
Probably the best way to start is to create the coredump / backtrace ( [http://wiki.nginx.org/NginxDebugging](http://wiki.nginx.org/NginxDebugging) ). Also as that is a third-party module tried to contact the author directly (if you are sure the module is the cause)? (the first step most likely will be needed anyways unless the module is broken in general with the nginx version changes). rr * * * From: “MokuTheCow” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) Sent: Thursday, June 03, 2010 4:42 PM To: [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) Subject: Segfault with Secure Download ---
**Author:** ![MokuTheCow](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/51bf81/32.png) [@MokuTheCow](https://www.ruby-forum.com/u/MokuTheCow)\ **Post date:** [June 3, 2010, 4:55pm UTC](https://www.ruby-forum.com/t/segfault-with-secure-download/189585/3 "2010-06-03T16:55:53Z")
i agree, to be able to help you i will need more debug info like a backtrace. please do not forget to also include your config file. you also mentioned that those segfaults suddenly started, do you know if anything changed, in the config or wherever at this time? ---
**Author:** ![MokuTheCow](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/51bf81/32.png) [@MokuTheCow](https://www.ruby-forum.com/u/MokuTheCow)\ **Post date:** [June 7, 2010, 8:30am UTC](https://www.ruby-forum.com/t/segfault-with-secure-download/189585/4 "2010-06-07T08:30:23Z")
hi, did you ever find anything more about this segfault? if its really related to the secure download module i would be interested in fixing it. mauro ---
**Author:** ![MokuTheCow](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/51bf81/32.png) [@MokuTheCow](https://www.ruby-forum.com/u/MokuTheCow)\ **Post date:** [June 17, 2010, 9:08pm UTC](https://www.ruby-forum.com/t/segfault-with-secure-download/189585/5 "2010-06-17T21:08:54Z")
-V `[root@localhost ~]# nginx -V nginx version: nginx/0.7.9 built by gcc 4.4.3 20100127 (Red Hat 4.4.3-4) (GCC) configure arguments: --with-http_flv_module --add-module=/root/nginx/ngx_http_secure_download/ --add-module=/root/nginx/nginx_mod_h264_streaming-2.2.7/` conf [code]worker\_processes 512; worker\_rlimit\_core 500M; working\_directory /tmp; timer\_resolution 1000ms; #pid logs/nginx.pid; events { worker\_connections 16384; multi\_accept on; } http { ``` include mime.types; default_type application/octet-stream; sendfile on; tcp_nopush on; keepalive_timeout 15; access_log /dev/null combined; error_log /dev/null crit; server { listen 74.82.53.42:8080; server_name node1.website.com; location / { flv; root /home/ssd/; secure_download on; secure_download_secret "pass"; secure_download_path_mode file; } } ``` } [/code] After doing some more testing, when the download finishes via secure\_download is when nginx fails out with the error in the first post. `2010/06/17 15:02:02 [info] 3475#0: *1001 securedownload: evaluated value of secret: "tacorape", client: 207.178.151.60, server: node1.fairyshare.com, request: "GET /Victoria_Crater__Cape_Verde_Mars_small.jpg/73fb3ecfdbc865c4e2905825d8d18113/4c1a75c3 HTTP/1.1", host: "node1.fairyshare.com:8080" 2010/06/17 15:02:02 [debug] 3475#0: *1001 hashing string "/Victoria_Crater__Cape_Verde_Mars_small.jpg/tacorape/4c1a75c3" with len 61 2010/06/17 15:02:02 [debug] 3475#0: *1001 computed hash: 73fb3ecfdbc865c4e2905825d8d18113 ` Then in the syslog… `Jun 17 15:02:04 localhost kernel: nginx[3475]: segfault at 1 ip 000000000041e6c6 sp 00007ffff0891c98 error 4 in nginx[400000+6a000]` Posted at Nginx Forum: > **[Re: Segfault with Secure Download](https://forum.nginx.org/read.php?2,94061,99579#msg-99579)** > > Hi; I've compiled in Secure Download to nginx 0.7.65 & 0.8.39 and whenever I make use of the Secure Download directives, the processes keep segfaulting. \[code\] \[size=small\]Jun 3 04:04:03 localhost kernel: nginx\[23299\]: segfault at 1 ip... ---
**Author:** ![MokuTheCow](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/51bf81/32.png) [@MokuTheCow](https://www.ruby-forum.com/u/MokuTheCow)\ **Post date:** [June 18, 2010, 4:49am UTC](https://www.ruby-forum.com/t/segfault-with-secure-download/189585/6 "2010-06-18T04:49:34Z")
could you please check if this still happens if you add a secure\_download\_fail\_location? [http://wiki.nginx.org/NginxHttpSecureDownload](http://wiki.nginx.org/NginxHttpSecureDownload) ---
**Author:** ![MokuTheCow](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/51bf81/32.png) [@MokuTheCow](https://www.ruby-forum.com/u/MokuTheCow)\ **Post date:** [June 18, 2010, 7:11am UTC](https://www.ruby-forum.com/t/segfault-with-secure-download/189585/7 "2010-06-18T07:11:47Z")
## replay Wrote: > could you please check if this still happens if > you add a > secure\_download\_fail\_location? works now 🙂 - Thank you very much for your help. Posted at Nginx Forum: [http://forum.nginx.org/read.php?2,94061,99719#msg-99719](http://forum.nginx.org/read.php?2,94061,99719#msg-99719) ---
**Author:** ![MokuTheCow](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/51bf81/32.png) [@MokuTheCow](https://www.ruby-forum.com/u/MokuTheCow)\ **Post date:** [June 17, 2010, 9:08pm UTC](https://www.ruby-forum.com/t/segfault-with-secure-download/189585/8 "2010-06-17T21:08:54Z")
-V `[root@localhost ~]# nginx -V nginx version: nginx/0.7.9 built by gcc 4.4.3 20100127 (Red Hat 4.4.3-4) (GCC) configure arguments: --with-http_flv_module --add-module=/root/nginx/ngx_http_secure_download/ --add-module=/root/nginx/nginx_mod_h264_streaming-2.2.7/` conf [code]worker\_processes 512; worker\_rlimit\_core 500M; working\_directory /tmp; timer\_resolution 1000ms; #pid logs/nginx.pid; events { worker\_connections 16384; multi\_accept on; } http { ``` include mime.types; default_type application/octet-stream; sendfile on; tcp_nopush on; keepalive_timeout 15; access_log /dev/null combined; error_log /dev/null crit; server { listen 74.82.53.42:8080; server_name node1.website.com; location / { flv; root /home/ssd/; secure_download on; secure_download_secret "pass"; secure_download_path_mode file; } } ``` } [/code] After doing some more testing, when the download finishes via secure\_download is when nginx fails out with the error in the first post. `2010/06/17 15:02:02 [info] 3475#0: *1001 securedownload: evaluated value of secret: "tacorape", client: 207.178.151.60, server: node1.fairyshare.com, request: "GET /Victoria_Crater__Cape_Verde_Mars_small.jpg/73fb3ecfdbc865c4e2905825d8d18113/4c1a75c3 HTTP/1.1", host: "node1.fairyshare.com:8080" 2010/06/17 15:02:02 [debug] 3475#0: *1001 hashing string "/Victoria_Crater__Cape_Verde_Mars_small.jpg/tacorape/4c1a75c3" with len 61 2010/06/17 15:02:02 [debug] 3475#0: *1001 computed hash: 73fb3ecfdbc865c4e2905825d8d18113 ` Then in the syslog… `Jun 17 15:02:04 localhost kernel: nginx[3475]: segfault at 1 ip 000000000041e6c6 sp 00007ffff0891c98 error 4 in nginx[400000+6a000]` Posted at Nginx Forum: > **[Re: Segfault with Secure Download](https://forum.nginx.org/read.php?2,94061,99580#msg-99580)** > > Hi; I've compiled in Secure Download to nginx 0.7.65 & 0.8.39 and whenever I make use of the Secure Download directives, the processes keep segfaulting. \[code\] \[size=small\]Jun 3 04:04:03 localhost kernel: nginx\[23299\]: segfault at 1 ip... ---
**Author:** ![MokuTheCow](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/51bf81/32.png) [@MokuTheCow](https://www.ruby-forum.com/u/MokuTheCow)\ **Post date:** [June 18, 2010, 7:13am UTC](https://www.ruby-forum.com/t/segfault-with-secure-download/189585/9 "2010-06-18T07:13:33Z")
k, i think i will just make the secure\_download\_fail\_location parameter mandatory, since it anyway doesn’t make sense to don’t have it. seems that a few people already struggled over that problem. ---
**Author:** ![MokuTheCow](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/51bf81/32.png) [@MokuTheCow](https://www.ruby-forum.com/u/MokuTheCow)\ **Post date:** [June 21, 2010, 8:38am UTC](https://www.ruby-forum.com/t/segfault-with-secure-download/189585/10 "2010-06-21T08:38:37Z")
hi, i just uploaded a new version which should now tell you that it won’t work if you don’t specify the fail location: [http://wiki.nginx.org/File:Ngx\_http\_secure\_download.tar.gz](http://wiki.nginx.org/File:Ngx_http_secure_download.tar.gz) mauro