This is what i discovered yesterday, i ported my application from
ns_cache module to internal Tcl cache API and got SEGV crashes. Under
high concurrency when inside ns_cache_eval i call another ns_cache_set C
cache API crashes, using ns_cache it was working the last couple of
years. It always crashes in this place.
Loaded symbols for /lib/libresolv.so.2
#0 Push (ePtr=0xa92ab878) at cache.c:904
904 ePtr->cachePtr->firstEntryPtr->prevPtr = ePtr;
(gdb) bt
#0 Push (ePtr=0xa92ab878) at cache.c:904
#1 0xb7f59cb5 in Ns_CacheWaitCreateEntry (cache=0x839e858,
key=0x867fb98 "6", newPtr=0xabc3575c, timeout=360) at cache.c:295
#2 0xb7f79a5b in CreateEntry (itPtr=0x888bcf8, cache=0x839e858,
key=0x867fb98 "6", newPtr=0x8a990000, timeout=360)
at tclcache.c:686
#3 0xb7f7a01c in NsTclCacheSetObjCmd (arg=0x888bcf8, interp=0x88b5120,
objc=-1969684480, objv=0x8a990000) at tclcache.c:367
#4 0xb7ea9143 in TclEvalObjvInternal (interp=0x88b5120, objc=4,
objv=0x88c775c, command=0x0, length=0, flags=0)
at
/home/vlad/src/lmbox/linux/src/tcl/src/tcl8.4.12/unix/../generic/tclBasic.c:3085
#5 0xb7ed2fa0 in TclExecuteByteCode (interp=0x88b5120, codePtr=0x891cb80)
at
/home/vlad/src/lmbox/linux/src/tcl/src/tcl8.4.12/unix/../generic/tclExecute.c:1419
#6 0xb7ed8ee8 in TclCompEvalObj (interp=0x88b5120, objPtr=0x888ec38)
at
/home/vlad/src/lmbox/linux/src/tcl/src/tcl8.4.12/unix/../generic/tclExecute.c:981
#7 0xb7eab94b in Tcl_EvalObjEx (interp=0x88b5120, objPtr=0x888ec38,
flags=0)
at
/home/vlad/src/lmbox/linux/src/tcl/src/tcl8.4.12/unix/../generic/tclBasic.c:4049
#8 0xb7f7a521 in NsTclCacheEvalObjCmd (arg=0x888bcf8, interp=0x88b5120,
objc=6, objv=0x88c7744) at tclcache.c:167
#9 0xb7ea9143 in TclEvalObjvInternal (interp=0x88b5120, objc=6,
objv=0x88c7744, command=0x0, length=0, flags=0)
at
/home/vlad/src/lmbox/linux/src/tcl/src/tcl8.4.12/unix/../generic/tclBasic.c:3085
#10 0xb7ed2fa0 in TclExecuteByteCode (interp=0x88b5120, codePtr=0x89174e0)
at
/home/vlad/src/lmbox/linux/src/tcl/src/tcl8.4.12/unix/../generic/tclExecute.c:1419
#11 0xb7ed8ee8 in TclCompEvalObj (interp=0x88b5120, objPtr=0x888f2f8)
at
/home/vlad/src/lmbox/linux/src/tcl/src/tcl8.4.12/unix/../generic/tclExecute.c:981
#12 0xb7eab94b in Tcl_EvalObjEx (interp=0x88b5120, objPtr=0x888f2f8,
flags=0)
at
/home/vlad/src/lmbox/linux/src/tcl/src/tcl8.4.12/unix/../generic/tclBasic.c:4049
#13 0xb7eb0dba in Tcl_ForObjCmd (dummy=0x0, interp=0x88b5120, objc=5,
objv=0xabc362ac)
at
/home/vlad/src/lmbox/linux/src/tcl/src/tcl8.4.12/unix/../generic/tclCmdAH.c:1638
#14 0xb7ea9143 in TclEvalObjvInternal (interp=0x88b5120, objc=5,
objv=0xabc362ac,
command=0x840144f "for {set j 0} {$j < 1000} {incr j} {\n", ' '
<repeats 16 times>, "for {set x 0} {$x < 10000} {incr x} {set a b}\n", '
' <repeats 16 times>, "ns_cache_eval -ttl 1 c1 k1 {\n", ' ' <repeats 18
times>, "ns_cache_set c1 $j $j\n", ' ' <repeats 16 times>...,
length=276, flags=0) at
/home/vlad/src/lmbox/linux/src/tcl/src/tcl8.4.12/unix/../generic/tclBasic.c:3085
#15 0xb7eaace4 in Tcl_EvalEx (interp=0x88b5120,
script=0x8401440 " \n", ' ' <repeats 12 times>, "for {set j 0} {$j
< 1000} {incr j} {\n", ' ' <repeats 16 times>, "for {set x 0} {$x <
10000} {incr x} {set a b}\n", ' ' <repeats 16 times>, "ns_cache_eval
-ttl 1 c1 k1 {\n", ' ' <repeats 18 times>, "ns_cache_set c1 $j $j\n
"..., numBytes=299, flags=0) at
/home/vlad/src/lmbox/linux/src/tcl/src/tcl8.4.12/unix/../generic/tclBasic.c:3687
#16 0xb7f7f58e in Ns_TclEval (dsPtr=0x0, server=0x8a990000 <Address
0x8a990000 out of bounds>,
script=0x8a990000 <Address 0x8a990000 out of bounds>) at tclinit.c:227
#17 0xb7f8c48f in NsTclThread (arg=0x8401438) at tclthread.c:660
#18 0xb7f3c524 in NsThreadMain (arg=0x82ac7e8) at thread.c:224
#19 0xb7f3d2dd in ThreadMain (arg=0x8a990000) at pthread.c:736
#20 0xb7cd5240 in start_thread () from /lib/tls/libpthread.so.0
Vlad Seryakov wrote:
Update of /cvsroot/naviserver/naviserver/tests
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv27307
Modified Files:
ns_cache.test
Log Message:
Hard cache test which works in case of ns_cache modules but core dumps using
ns_cache_eval
Index: ns_cache.test
===================================================================
RCS file: /cvsroot/naviserver/naviserver/tests/ns_cache.test,v
retrieving revision 1.4
retrieving revision 1.5
diff -C2 -d -r1.4 -r1.5
*** ns_cache.test 5 Apr 2006 18:24:57 -0000 1.4
--- ns_cache.test 6 Apr 2006 23:20:44 -0000 1.5
***************
*** 300,304 ****
for {set j 0} {$j < 1000} {incr j} {
for {set x 0} {$x < 10000} {incr x} {set a b}
! ns_cache_eval c1 k1 {return a}
ns_thread yield
}
--- 300,307 ----
for {set j 0} {$j < 1000} {incr j} {
for {set x 0} {$x < 10000} {incr x} {set a b}
! ns_cache_eval -ttl 1 c1 k1 {
! ns_cache_set c1 $j $j
! return a
! }
ns_thread yield
}
***************
*** 308,311 ****
--- 311,315 ----
for {set j 0} {$j < 1000} {incr j} {
for {set x 0} {$x < 10000} {incr x} {set a b}
+ ns_cache_get c1 $j
ns_cache_flush c1
ns_thread yield
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Vlad Seryakov
571 262-8608 office
[EMAIL PROTECTED]
http://www.crystalballinc.com/vlad/
