Hello all,
Whenever my Varnish (2.0.6) servers experience a traffic spike after a
couple days of uptime I see the following message in syslog:
Mar 4 13:26:09 cache02 varnishd[28881]: Child (28882) Panic message:
Missing errorhandling code in HSH_Prepare(), cache_hash.c line 199:
Condition((p) != 0) not true.thread = (cache-worker) Backtrace:
0x41d63a: /usr/sbin/varnishd [0x41d63a] 0x417ed8:
/usr/sbin/varnishd(HSH_Prepare+0xb8) [0x417ed8] 0x410eaa:
/usr/sbin/varnishd [0x410eaa] 0x41286d:
/usr/sbin/varnishd(CNT_Session+0x41d) [0x41286d] 0x427852:
/usr/sbin/varnishd(ESI_Deliver+0x282) [0x427852] 0x41fe3f:
/usr/sbin/varnishd(RES_WriteObj+0x25f) [0x41fe3f] 0x411a72:
/usr/sbin/varnishd [0x411a72] 0x4127cd:
/usr/sbin/varnishd(CNT_Session+0x37d) [0x4127cd] 0x41ec93:
/usr/sbin/varnishd [0x41ec93] 0x41f402: /usr/sbin/varnishd
[0x41f402] sp = 0x7fb225202008 { fd = 63, id = 63, xid = 0, client
= 124.168.62.14:17605, step = STP_LOOKUP, handling = hash,
restarts = 0, esis = 1 ws = 0x7fb225202080 { overflow id =
"sess", {s,f,r,e} = {0x7fb225202820,+551046,(nil),+551077}, },
http[req] = { ws = 0x7fb225202080[sess]
I don't really know how to interpret this, but I see references to
"esi" and "session". ESI is used heavily and sess_workspace is 551077.
Below I have the Varnish startup parameters. Should I just continue to
increase the sess_workspace until it stops happening? I have also seen
mentioned online that a backend could be potentially dying though I
can't see to gather that from the above output.
DAEMON_OPTS="-a :80 \
-T :6082 \
-f /etc/varnish/default.vcl \
-w 40,100,60 \
-p obj_workspace=4096 \
-p sess_workspace=551077 \
-p listen_depth=8192 \
-p log_hashstring=off \
-p lru_interval=60 \
-p sess_timeout=10 \
-p shm_workspace=32768 \
-p ping_interval=1 \
-p thread_pools=4 \
-p thread_pool_min=50 \
-p srcaddr_ttl=0 \
-p esi_syntax=0x00000003 \
-s malloc,2G"
Thanks.
--
Simon Males
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