issue with ServerSocket::accept
Simon
gcj@gornall.net
Thu Jun 17 14:59:00 GMT 2004
Bryce McKinlay wrote:
> Vladimir Leven wrote:
>
>> Oops. It does seem to block -- my mistake. But there is still a
>> problem. When I close the serverSocket, java generates a
>> SocketException, but gcj does not appear to do so.
>
>
>
> Looks like we don't implement blocking I/O interruption with close().
> I've set up a bug report to track this issue, with a self-contained
> test case:
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15430
>
> Does anyone know of a good way to implement this? Can select() do it?
>
> Bryce
>
I think I've just run into the same bug when trying to compile the
Apache.org XML-RPC library. Just creating a 'Webserver' (one of the
supplied classes that nicely handles XML-RPC requests) is sufficient to
cause the problem. The symptoms are that the sockets don't appear to be
being closed properly, so are hanging around, and in 20 minutes or so,
the program dies from lack of available file descriptors (per-process
limit set to 1024 on the machine). It doesn't happen with the usual
javac classes.
eg:
[root@cyclops tkcvs]# lsof -p 12720
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
stbserver 12720 simon cwd DIR 3,8 4096 12238874
/home/simon/setTopBoxServer
stbserver 12720 simon rtd DIR 3,3 4096 2 /
stbserver 12720 simon txt REG 3,8 1645112 12238878
/home/simon/setTopBoxServer/stbserver
stbserver 12720 simon mem REG 3,3 106400 144393
/lib/ld-2.3.2.so
stbserver 12720 simon mem REG 3,5 21040 1158931
/usr/lib/gconv/gconv-modules.cache
stbserver 12720 simon mem REG 3,5 222464 620191
/usr/lib/mysql/libmysqlclient.so.10.0.0
stbserver 12720 simon mem REG 3,5 52616 65368
/usr/lib/libz.so.1.1.4
stbserver 12720 simon mem REG 3,3 23688 144298
/lib/libcrypt-2.3.2.so
stbserver 12720 simon mem REG 3,3 91624 144304
/lib/libnsl-2.3.2.so
stbserver 12720 simon mem REG 3,3 212020 32070
/lib/i686/libm-2.3.2.so
stbserver 12720 simon mem REG 3,3 3631142 99762
/opt/gcc/lib/libstdc++.so.6.0.0
stbserver 12720 simon mem REG 3,3 165116 99722
/opt/gcc/lib/libgcc_s.so.1
stbserver 12720 simon mem REG 3,3 42274266 99786
/opt/gcc/lib/libgcj.so.5.0.0
stbserver 12720 simon mem REG 3,3 93412 32072
/lib/i686/libpthread-0.10.so
stbserver 12720 simon mem REG 3,3 15900 144300
/lib/libdl-2.3.2.so
stbserver 12720 simon mem REG 3,3 1552740 32691
/lib/i686/libc-2.3.2.so
stbserver 12720 simon mem REG 3,5 31202800 198222
/usr/lib/locale/locale-archive
stbserver 12720 simon mem REG 3,3 52492 144310
/lib/libnss_files-2.3.2.so
stbserver 12720 simon 0u CHR 136,4 6 /dev/pts/4
stbserver 12720 simon 1u CHR 136,4 6 /dev/pts/4
stbserver 12720 simon 2u CHR 136,4 6 /dev/pts/4
stbserver 12720 simon 3r FIFO 0,5 74950150 pipe
stbserver 12720 simon 4w FIFO 0,5 74950150 pipe
stbserver 12720 simon 5u IPv4 74950151 TCP *:3305 (LISTEN)
stbserver 12720 simon 6u sock 0,0 74950152 can't
identify protocol
stbserver 12720 simon 7u sock 0,0 74950153 can't
identify protocol
stbserver 12720 simon 8u sock 0,0 74951244 can't
identify protocol
stbserver 12720 simon 9u sock 0,0 74951245 can't
identify protocol
stbserver 12720 simon 10u sock 0,0 74951621 can't
identify protocol
stbserver 12720 simon 11u sock 0,0 74952000 can't
identify protocol
(wait 5 secs)
[root@cyclops tkcvs]# lsof -p 12720
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
stbserver 12720 simon cwd DIR 3,8 4096 12238874
/home/simon/setTopBoxServer
stbserver 12720 simon rtd DIR 3,3 4096 2 /
stbserver 12720 simon txt REG 3,8 1645112 12238878
/home/simon/setTopBoxServer/stbserver
stbserver 12720 simon mem REG 3,3 106400 144393
/lib/ld-2.3.2.so
stbserver 12720 simon mem REG 3,5 21040 1158931
/usr/lib/gconv/gconv-modules.cache
stbserver 12720 simon mem REG 3,5 222464 620191
/usr/lib/mysql/libmysqlclient.so.10.0.0
stbserver 12720 simon mem REG 3,5 52616 65368
/usr/lib/libz.so.1.1.4
stbserver 12720 simon mem REG 3,3 23688 144298
/lib/libcrypt-2.3.2.so
stbserver 12720 simon mem REG 3,3 91624 144304
/lib/libnsl-2.3.2.so
stbserver 12720 simon mem REG 3,3 212020 32070
/lib/i686/libm-2.3.2.so
stbserver 12720 simon mem REG 3,3 3631142 99762
/opt/gcc/lib/libstdc++.so.6.0.0
stbserver 12720 simon mem REG 3,3 165116 99722
/opt/gcc/lib/libgcc_s.so.1
stbserver 12720 simon mem REG 3,3 42274266 99786
/opt/gcc/lib/libgcj.so.5.0.0
stbserver 12720 simon mem REG 3,3 93412 32072
/lib/i686/libpthread-0.10.so
stbserver 12720 simon mem REG 3,3 15900 144300
/lib/libdl-2.3.2.so
stbserver 12720 simon mem REG 3,3 1552740 32691
/lib/i686/libc-2.3.2.so
stbserver 12720 simon mem REG 3,5 31202800 198222
/usr/lib/locale/locale-archive
stbserver 12720 simon mem REG 3,3 52492 144310
/lib/libnss_files-2.3.2.so
stbserver 12720 simon 0u CHR 136,4 6 /dev/pts/4
stbserver 12720 simon 1u CHR 136,4 6 /dev/pts/4
stbserver 12720 simon 2u CHR 136,4 6 /dev/pts/4
stbserver 12720 simon 3r FIFO 0,5 74950150 pipe
stbserver 12720 simon 4w FIFO 0,5 74950150 pipe
stbserver 12720 simon 5u IPv4 74950151 TCP *:3305 (LISTEN)
stbserver 12720 simon 6u sock 0,0 74950152 can't
identify protocol
stbserver 12720 simon 7u sock 0,0 74950153 can't
identify protocol
stbserver 12720 simon 8u sock 0,0 74951244 can't
identify protocol
stbserver 12720 simon 9u sock 0,0 74951245 can't
identify protocol
stbserver 12720 simon 10u sock 0,0 74951621 can't
identify protocol
stbserver 12720 simon 11u sock 0,0 74952000 can't
identify protocol
stbserver 12720 simon 12u sock 0,0 74952382 can't
identify protocol
(wait another 60 secs or so)
[root@cyclops tkcvs]# lsof -p 12720
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
stbserver 12720 simon cwd DIR 3,8 4096 12238874
/home/simon/setTopBoxServer
stbserver 12720 simon rtd DIR 3,3 4096 2 /
stbserver 12720 simon txt REG 3,8 1645112 12238878
/home/simon/setTopBoxServer/stbserver
stbserver 12720 simon mem REG 3,3 106400 144393
/lib/ld-2.3.2.so
stbserver 12720 simon mem REG 3,5 21040 1158931
/usr/lib/gconv/gconv-modules.cache
stbserver 12720 simon mem REG 3,5 222464 620191
/usr/lib/mysql/libmysqlclient.so.10.0.0
stbserver 12720 simon mem REG 3,5 52616 65368
/usr/lib/libz.so.1.1.4
stbserver 12720 simon mem REG 3,3 23688 144298
/lib/libcrypt-2.3.2.so
stbserver 12720 simon mem REG 3,3 91624 144304
/lib/libnsl-2.3.2.so
stbserver 12720 simon mem REG 3,3 212020 32070
/lib/i686/libm-2.3.2.so
stbserver 12720 simon mem REG 3,3 3631142 99762
/opt/gcc/lib/libstdc++.so.6.0.0
stbserver 12720 simon mem REG 3,3 165116 99722
/opt/gcc/lib/libgcc_s.so.1
stbserver 12720 simon mem REG 3,3 42274266 99786
/opt/gcc/lib/libgcj.so.5.0.0
stbserver 12720 simon mem REG 3,3 93412 32072
/lib/i686/libpthread-0.10.so
stbserver 12720 simon mem REG 3,3 15900 144300
/lib/libdl-2.3.2.so
stbserver 12720 simon mem REG 3,3 1552740 32691
/lib/i686/libc-2.3.2.so
stbserver 12720 simon mem REG 3,5 31202800 198222
/usr/lib/locale/locale-archive
stbserver 12720 simon mem REG 3,3 52492 144310
/lib/libnss_files-2.3.2.so
stbserver 12720 simon 0u CHR 136,4 6 /dev/pts/4
stbserver 12720 simon 1u CHR 136,4 6 /dev/pts/4
stbserver 12720 simon 2u CHR 136,4 6 /dev/pts/4
stbserver 12720 simon 3r FIFO 0,5 74950150 pipe
stbserver 12720 simon 4w FIFO 0,5 74950150 pipe
stbserver 12720 simon 5u IPv4 74950151 TCP *:3305 (LISTEN)
stbserver 12720 simon 6u sock 0,0 74950152 can't
identify protocol
stbserver 12720 simon 7u sock 0,0 74950153 can't
identify protocol
stbserver 12720 simon 8u sock 0,0 74951244 can't
identify protocol
stbserver 12720 simon 9u sock 0,0 74951245 can't
identify protocol
stbserver 12720 simon 10u sock 0,0 74951621 can't
identify protocol
stbserver 12720 simon 11u sock 0,0 74952000 can't
identify protocol
stbserver 12720 simon 12u sock 0,0 74952382 can't
identify protocol
stbserver 12720 simon 13u sock 0,0 74952767 can't
identify protocol
stbserver 12720 simon 14u sock 0,0 74952768 can't
identify protocol
stbserver 12720 simon 15u sock 0,0 74952770 can't
identify protocol
stbserver 12720 simon 16u sock 0,0 74952771 can't
identify protocol
stbserver 12720 simon 17u sock 0,0 74952772 can't
identify protocol
stbserver 12720 simon 18u sock 0,0 74952773 can't
identify protocol
stbserver 12720 simon 19u sock 0,0 74952774 can't
identify protocol
stbserver 12720 simon 20u sock 0,0 74952775 can't
identify protocol
stbserver 12720 simon 21u sock 0,0 74952776 can't
identify protocol
stbserver 12720 simon 22u sock 0,0 74952777 can't
identify protocol
stbserver 12720 simon 23u sock 0,0 74952778 can't
identify protocol
stbserver 12720 simon 24u sock 0,0 74952779 can't
identify protocol
stbserver 12720 simon 25u sock 0,0 74952780 can't
identify protocol
This is running with gcj 3.4.0 (as shipped with RH9.0). I can't see
anything on the bug reports or in the mailing list, but thought I'd ask
to see if anyone has a solution, or if there's one in CVS ? (The machine
'cyclops' is a 600MHz VIA Nehemiah, so downloading and compiling gcc/gcj
from CVS will take a few days...)
ATB,
Simon
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