Dear List,
After deployment of a vmod we've written (that enables us to select a director
by id in url), we've been experiencing assert errors.
Below are the stack traces, but to not waste your time, here's what I think it
boils down to:
{ overflow#012 id = "sess",#012 {s,f,r,e} =
{0x7fed76034c78,+16384,(nil),+16384},#012 }
4k as session workspace has worked fine for us for years, but our vmod sharding
adds hundreds of directors (as opposed to 4), while the number of backends
stayed the same (about 25).
So, my question is, do I just need to increase sess_workspace to fix this? If
not, what else ;)
Regards,
Enno van Amerongen
Both stacktraces
Apr 2 18:43:32 obfuscated /var/www/varnish[12750]: Child (20498) Panic
message: Assert error in vh_get_var_alloc(), vmod_var.c line 77:#012
Condition((v) != 0) not true.#012errno = 32 (Broken pipe)#012thread =
(cache-worker)#012ident =
Linux,2.6.32-5-amd64,x86_64,-smalloc,-smalloc,-hcritbit,epoll#012Backtrace:#012
0x439199: pan_backtrace+19#012 0x43946e: pan_ic+1ad#012 0x7fe137efe347:
_end+7fe13786898f#012 0x7fe137efe862: _end+7fe137868eaa#012 0x7fecc5b93e73:
_end+7fecc54fe4bb#012 0x7fecc5b939ea: _end+7fecc54fe032#012 0x7fecc5ba24f1:
_end+7fecc550cb39#012 0x4417bd: VCL_recv_method+6d#012 0x41d8f5:
cnt_recv+262#012 0x41e68d: CNT_Session+5cb#012sp = 0x7fed81293008 {#012 fd =
2849, id = 2849, xid = 918440385,#012 client = 10.1.1.1 51854,#012 step =
STP_RECV,#012 handling = deliver,#012 err_code = 200, err_reason =
(null),#012 restarts = 0, esi_level = 0#012 flags = #012 bodystatus = 4#012
ws = 0x7fed81293080 { overflow#012 id = "sess",#012 {s,f,r,e} =
{0x7fed81293c78,+16384,(nil),+16384},#012 },#012 http[req] = {#012 ws =
0x7fed81293080[sess]#012 "GET",#012 "/f/146057654_2.jpg",#012
"HTTP/1.1",#012 "User-Agent: Opera/9.80 (Windows NT 6.1; WOW64)
Presto/2.12.388 Version/12.14",#012 "Host: img.obfuscated.com",#012
"Accept: text/html, application/xml;q=0.9, application/xhtml+xml, image/png,
image/webp, image/jpeg, image/gif, image/x-xbitmap, */*;q=0.1",#012
"Accept-Language: fr-FR,fr;q=0.9,en;q=0.8",#012 "Referer:
http://obfuscated",#012 "Connection: Keep-Alive",#012 },#012 worker =
0x7feece7efaa0 {#012 ws = 0x7feece7efcd8 { #012 id = "wrk",#012
{s,f,r,e} = {0x7feece7dd9f0,+16,(nil),+65536},#012 },#012 },#012 vcl =
{#012 srcname = {#012 "input",#012 "Default",#012
"/obfuscated/img_backends.vcl",#012 "/obfuscated/img_directors.vcl",#012
So we removed the vmod_var from our configuration as it wasn't really required
anyway.
Then 13 minutes later, Varnish crashed again, now with a different, but similar
assert error:
Apr 2 19:07:22 obfuscated /var/www/varnish[12750]: Child (18818) Panic
message: Assert error in VRT_int_string(), cache_vrt.c line 324:#012
Condition((p = WS_Alloc(sp->http->ws, size)) != 0) not true.#012thread =
(cache-worker)#012ident =
Linux,2.6.32-5-amd64,x86_64,-smalloc,-smalloc,-hcritbit,epoll#012Backtrace:#012
0x439199: pan_backtrace+19#012 0x43946e: pan_ic+1ad#012 0x4435f7:
VRT_int_string+88#012 0x7fe686b9ce1f: _end+7fe686507467#012 0x7fe686b9c99a:
_end+7fe686506fe2#012 0x7fe686ba7424: _end+7fe686511a6c#012 0x4417bd:
VCL_recv_method+6d#012 0x41d8f5: cnt_recv+262#012 0x41e68d:
CNT_Session+5cb#012 0x43aa0a: wrk_thread_real+8cc#012sp = 0x7fed76034008 {#012
fd = 2357, id = 2357, xid = 2009537706,#012 client = 80.239.243.196
59852,#012 step = STP_RECV,#012 handling = deliver,#012 err_code = 200,
err_reason = (null),#012 restarts = 0, esi_level = 0#012 flags = #012
bodystatus = 4#012 ws = 0x7fed76034080 { overflow#012 id = "sess",#012
{s,f,r,e} = {0x7fed76034c78,+16384,(nil),+16384},#012 },#012 http[req] =
{#012 ws = 0x7fed76034080[sess]#012 "GET",#012
"/f/148682988.jpg",#012 "HTTP/1.1",#012 "User-Agent: Opera/9.80
(Android; Opera Mini/7.5.32193/29.3134; U; nl) Presto/2.8.119
Version/11.10",#012 "Host: img.obfuscated.com",#012 "Accept:
text/html, application/xml;q=0.9, application/xhtml+xml, image/png, image/webp,
image/jpeg, image/gif, image/x-xbitmap, */*;q=0.1",#012 "Accept-Language:
nl,en;q=0.9",#012 "Referer: obfuscated",#012 "Connection:
Keep-Alive",#012 "X-OperaMini-Phone: Android #",#012
"X-OperaMini-Phone-UA: Mozilla/5.0 (Linux; U; Android 2.2.2; nl-be; Stockholm
Build/HuaweiU8180) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile
Safari/533.1",#012 "x-forwarded-for: obfuscated",#012
"Device-Stock-UA: Mozilla/5.0 (Linux; U; Android 2.2.2; nl-be; Stockholm
Build/HuaweiU8180) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile
Safari/533.1",#012 "X_______________________________________________
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