I have a situation where I see some number of threads in a
multi-threaded ODBC program waiting in libc_recv. I have used gdb to
attach to my program and produce a back trace, which is copied at the
end of the message.
The issue is fairly easy to reproduce by having only a 4 or 5 threads
repeatedly call a stored procedure in a tight loop. I can provide more
information if it will help.
Back trace:
#0 0x40301722 in __libc_recv () at __libc_recv:-1
#1 0x401ed9d6 in recv (fd=7, buf=0x403ab1a8, n=130576, flags=0)
at wrapsyscall.c:198
#2 0x401098cd in sql42_rcvpkt ()
from /opt/sapdb/interfaces/odbc/lib/libsqlod.so
#3 0x4010b433 in sql42_recv_packet ()
from /opt/sapdb/interfaces/odbc/lib/libsqlod.so
#4 0x401056af in sql23_receive ()
from /opt/sapdb/interfaces/odbc/lib/libsqlod.so
#5 0x400fb4ed in sql03_receive ()
from /opt/sapdb/interfaces/odbc/lib/libsqlod.so
#6 0x400fc001 in sqlareceive ()
from /opt/sapdb/interfaces/odbc/lib/libsqlod.so
#7 0x400e18f4 in p03creceive ()
from /opt/sapdb/interfaces/odbc/lib/libsqlod.so
#8 0x400e2b1e in p03creqrecpacket ()
from /opt/sapdb/interfaces/odbc/lib/libsqlod.so
#9 0x400d1b60 in pr03PacketReqRec ()
from /opt/sapdb/interfaces/odbc/lib/libsqlod.so
#10 0x400df29b in p03reqrecpacket ()
from /opt/sapdb/interfaces/odbc/lib/libsqlod.so
#11 0x400f1a07 in p11execute () from
/opt/sapdb/interfaces/odbc/lib/libsqlod.so
#12 0x400efb39 in p10allexecute ()
from /opt/sapdb/interfaces/odbc/lib/libsqlod.so
#13 0x400ef9f9 in p10forexecute ()
from /opt/sapdb/interfaces/odbc/lib/libsqlod.so
#14 0x400f06ea in p10execute () from
/opt/sapdb/interfaces/odbc/lib/libsqlod.so
#15 0x4009adc1 in apeexec () from
/opt/sapdb/interfaces/odbc/lib/libsqlod.so
#16 0x4008be26 in pa10execute ()
from /opt/sapdb/interfaces/odbc/lib/libsqlod.so
#17 0x4008bb96 in paSQLExecute ()
from /opt/sapdb/interfaces/odbc/lib/libsqlod.so
#18 0x4008c600 in SQLExecute () from
/opt/sapdb/interfaces/odbc/lib/libsqlod.so
--
Mark Wong - - [EMAIL PROTECTED]
Open Source Development Lab Inc - A non-profit corporation
15275 SW Koll Parkway - Suite H - Beaverton OR, 97006
(503)-626-2455 x 32 (office)
(503)-626-2436 (fax)
http://www.osdl.org/archive/markw/
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