Comment #2 on issue 387 by [email protected]: error of lru_crawler
https://code.google.com/p/memcached/issues/detail?id=387
I understand the issue now.
It is the same issue as the #388. The lru_crawler_cond is not waited by
any thread, so the crawler is added to the LRU again. I fix #388 at local
by initialize lru_crawler before options parsing, and add a check to the
crawler->it_flags at the same time.
----------------
Starting program: /root/memcached/memcached-debug -u root -p 4444 -o
lru_crawler,slab_reassign
[Thread debugging using libthread_db enabled]
[New Thread 0x7ffff7fe4700 (LWP 26038)]
[New Thread 0x7ffff732b700 (LWP 26039)]
[New Thread 0x7ffff692a700 (LWP 26040)]
[New Thread 0x7ffff5f29700 (LWP 26041)]
[New Thread 0x7ffff5528700 (LWP 26042)]
[New Thread 0x7ffff4b27700 (LWP 26043)]
[New Thread 0x7ffff4126700 (LWP 26044)]
[New Thread 0x7ffff3725700 (LWP 26045)]
memcached-debug: items.c:649: crawler_link_q: Assertion `it != *tail'
failed.
Program received signal SIGABRT, Aborted.
[Switching to Thread 0x7ffff4126700 (LWP 26044)]
0x0000003fcfa32635 in raise () from /lib64/libc.so.6
(gdb) where
#0 0x0000003fcfa32635 in raise () from /lib64/libc.so.6
#1 0x0000003fcfa33e15 in abort () from /lib64/libc.so.6
#2 0x0000003fcfa2b75e in __assert_fail_base () from /lib64/libc.so.6
#3 0x0000003fcfa2b820 in __assert_fail () from /lib64/libc.so.6
#4 0x00000000004242a7 in crawler_link_q (it=0x641070) at items.c:649
#5 0x0000000000425a1f in lru_crawler_crawl (slabs=0x432fbe "all")
at items.c:919
#6 0x0000000000420438 in slab_maintenance_thread (arg=0x0) at slabs.c:737
#7 0x0000003fd02079d1 in start_thread () from /lib64/libpthread.so.0
#8 0x0000003fcfae886d in clone () from /lib64/libc.so.6
(gdb) f 4
#4 0x00000000004242a7 in crawler_link_q (it=0x641070) at items.c:649
649 assert(it != *tail);
(gdb) p it->slabs_clsid
$1 = 1 '\001'
(gdb) p *tail
$2 = (item *) 0x641070
(gdb) p *(item*)tail
$3 = {next = 0x641070, prev = 0x0, h_next = 0x0, time = 0, exptime = 0,
nbytes = 0, refcount = 0, nsuffix = 0 '\000', it_flags = 0 '\000',
slabs_clsid = 0 '\000', nkey = 0 '\000', data = 0x640a08}
(gdb) p lru_crawler_cond
$4 = {__data = {__lock = 0, __futex = 0, __total_seq = 0, __wakeup_seq = 0,
__woken_seq = 0, __mutex = 0x0, __nwaiters = 0, __broadcast_seq = 0},
__size = '\000' <repeats 47 times>, __align = 0}
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