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Re: (ITS#6021) slapo-pcache/back-ldap slapd crashes



OK, this is my first crash since moving to 2.4.16:

Slightly different from the previous ones, but is coming through
pcache.c:remove_from_template and, according to slapd log, was
removing queries from cache when crash occurred:

Apr  9 05:05:18 rockingham slapd[6662]: Lock CR index = 0x94e70f0 
Apr  9 05:05:18 rockingham slapd[6662]: TEMPLATE 0x94e70f0 QUERIES-- 5 
Apr  9 05:05:18 rockingham slapd[6662]: Unlock CR index = 0x94e70f0 
Apr  9 05:05:18 rockingham slapd[6662]: STALE QUERY REMOVED, SIZE=0 
Apr  9 05:05:18 rockingham slapd[6662]: STORED QUERIES = 26 
Apr  9 05:05:18 rockingham slapd[6662]: STALE QUERY REMOVED, CACHE =17
entries 
Apr  9 05:05:18 rockingham slapd[6662]: Lock CR index = 0x94e70f0 
Apr  9 05:05:18 rockingham slapd[6662]: TEMPLATE 0x94e70f0 QUERIES-- 4 
Apr  9 05:05:18 rockingham slapd[6662]: Unlock CR index = 0x94e70f0 
Apr  9 05:05:18 rockingham slapd[6662]: STALE QUERY REMOVED, SIZE=0 
Apr  9 05:05:18 rockingham slapd[6662]: STORED QUERIES = 25 
Apr  9 05:05:18 rockingham slapd[6662]: STALE QUERY REMOVED, CACHE =17
entries 
Apr  9 05:05:18 rockingham slapd[6662]: Lock CR index = 0x94e70f0 
Apr  9 05:05:18 rockingham slapd[6662]: TEMPLATE 0x94e70f0 QUERIES-- 3 
Apr  9 05:05:18 rockingham slapd[6662]: Unlock CR index = 0x94e70f0 
Apr  9 05:05:18 rockingham slapd[6662]: STALE QUERY REMOVED, SIZE=0 
Apr  9 05:05:18 rockingham slapd[6662]: STORED QUERIES = 24 
Apr  9 05:05:18 rockingham slapd[6662]: STALE QUERY REMOVED, CACHE =17
entries 
Apr  9 05:05:18 rockingham slapd[6662]: Lock CR index = 0x94e70f0 
Apr  9 05:05:18 rockingham slapd[6662]: TEMPLATE 0x94e70f0 QUERIES-- 2 
Apr  9 05:05:18 rockingham slapd[6662]: Unlock CR index = 0x94e70f0 
Apr  9 05:05:18 rockingham slapd[6662]: STALE QUERY REMOVED, SIZE=0 
Apr  9 05:05:18 rockingham slapd[6662]: STORED QUERIES = 23 
Apr  9 05:05:18 rockingham slapd[6662]: STALE QUERY REMOVED, CACHE =17
entries 
Apr  9 05:05:18 rockingham slapd[6662]: Lock CR index = 0x94e70f0 
Apr  9 05:05:18 rockingham slapd[6662]: TEMPLATE 0x94e70f0 QUERIES-- 1 
Apr  9 05:05:18 rockingham slapd[6662]: Unlock CR index = 0x94e70f0 
Apr  9 05:05:18 rockingham slapd[6662]: STALE QUERY REMOVED, SIZE=0 
Apr  9 05:05:18 rockingham slapd[6662]: STORED QUERIES = 22 
Apr  9 05:05:18 rockingham slapd[6662]: STALE QUERY REMOVED, CACHE =17
entries 
Apr  9 05:05:18 rockingham slapd[6662]: Lock CR index = 0x94e70f0 
Apr  9 05:05:18 rockingham slapd[6662]: TEMPLATE 0x94e70f0 QUERIES-- 0 
Apr  9 05:05:18 rockingham slapd[6662]: Unlock CR index = 0x94e70f0 
Apr  9 05:05:18 rockingham slapd[6662]: STALE QUERY REMOVED, SIZE=0 
Apr  9 05:05:18 rockingham slapd[6662]: STORED QUERIES = 21 
Apr  9 05:05:18 rockingham slapd[6662]: STALE QUERY REMOVED, CACHE =17
entries 
Apr  9 05:05:18 rockingham slapd[6662]: Lock CR index = 0x94e6eb0


Here's the backtrace:

Program terminated with signal 11, Segmentation fault.
#0  0x081764ed in pcache_query_cmp (v1=0xb1f0e900, v2=0x83e58955)
     at pcache.c:694
694    return pcache_filter_cmp( q1->first, q2->first );
(gdb) bt
#0  0x081764ed in pcache_query_cmp (v1=0xb1f0e900, v2=0x83e58955)
     at pcache.c:694
#1  0x08199b6d in tavl_delete (root=0x825d7d0, data=0xb1f0e900,
     fcmp=0x81764d8 <pcache_query_cmp>) at tavl.c:202
#2  0x08177ab4 in remove_from_template (qc=0xb1f0e900,
template=0x94e6eb0)
     at pcache.c:1302
#3  0x0817b57d in consistency_check (ctx=0xb44201d0, arg=0x9537c50)
     at pcache.c:2597
#4  0x0819fd01 in ldap_int_thread_pool_wrapper (xpool=0x94a8fa0) at
tpool.c:663
#5  0x009c546b in start_thread () from /lib/libpthread.so.0
#6  0x0091cdbe in clone () from /lib/libc.so.6
(gdb) 
(gdb) p q1->first
$3 = (Filter *) 0xb1f0d4c0
(gdb) p q2->first
Cannot access memory at address 0x83e58959

Let me know what else would be useful from this backtrace.

Cheers
Toby


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