Re: [Ssh-sftp-perl-users] Net::SSH2::Channel objects not getting destroyed
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Re: [Ssh-sftp-perl-users] Net::SSH2::Channel objects not getting destroyed
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From: Matt F. <Mat...@no...> - 2006-04-11 20:16:39
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I'm also having problems with a persistent process using Net::SSH2,=
=20
where after it has run for a long period (> 1 day) my scp_put and=
=20
channel->exec doesn't work any longer. I start getting lots of LIBSS=
H2=20
errors that don't make sense (e.g. Can't open public key file when th=
e=20
file is definitely available). Perhaps what Stephen documented is my=
=20
problem also?
Any ideas on this?
Matt
Stephen Clouse wrote:
> I am using Net::SSH2 as part of a persistent daemon. My issue is t=
hat
> ::Channel objects (including those that are implicitly created by
> scp_get) are not getting destroyed, even though they are leaving
> scope. This prevents the main Net::SSH2 object from getting destro=
yed
> when it goes out of scope, which causes both a memory leak and a
> socket descriptor leak. After a few hours of running, our process =
fd
> space looks like this:
>
> total 284
> lrwx------ 1 64 Apr 7 13:43 0 -> /dev/pts/2
> lrwx------ 1 64 Apr 7 13:43 1 -> /dev/pts/2
> lrwx------ 1 64 Apr 7 13:43 10 -> socket:[23023727]
> lrwx------ 1 64 Apr 7 13:43 100 -> socket:[25941479]
> lrwx------ 1 64 Apr 7 13:43 101 -> socket:[25942954]
> lrwx------ 1 64 Apr 7 13:43 102 -> socket:[25943607]
> lrwx------ 1 64 Apr 7 13:43 103 -> socket:[25945043]
> lrwx------ 1 64 Apr 7 13:43 104 -> socket:[25945575]
> lrwx------ 1 64 Apr 7 13:43 105 -> socket:[25946014]
> lrwx------ 1 64 Apr 7 13:43 106 -> socket:[25947262]
> lrwx------ 1 64 Apr 7 13:43 107 -> socket:[25947851]
> lrwx------ 1 64 Apr 7 13:43 108 -> socket:[25949223]
> lrwx------ 1 64 Apr 7 13:43 109 -> socket:[25950742]
> lrwx------ 1 64 Apr 7 13:43 11 -> socket:[23024789]
> lrwx------ 1 64 Apr 7 13:43 110 -> socket:[25951710]
> lrwx------ 1 64 Apr 7 13:43 111 -> socket:[25952922]
> lrwx------ 1 64 Apr 7 13:43 112 -> socket:[25953707]
> lrwx------ 1 64 Apr 7 13:43 113 -> socket:[25955436]
> lrwx------ 1 64 Apr 7 13:43 114 -> socket:[25957008]
> lrwx------ 1 64 Apr 7 13:43 115 -> socket:[25957766]
> lrwx------ 1 64 Apr 7 13:43 116 -> socket:[25958984]
> lrwx------ 1 64 Apr 7 13:43 117 -> socket:[25993099]
>
> ...and so on. Eventually the process either consumes all memory or
> hits the system fd limit and aborts.
>
> Here is some debug output from two different sessions. The first o=
ne
> is looking for files to copy (using SFTP stat) but doesn't find any=
.=20
> At the end the Net::SSH2 object is destroyed.
>
> [debug] start ssh session
> libssh2_sftp_init(ss->session) -> 0xa7cc6c0
> hv_from_attrs: attrs->flags =3D 15
> hv_from_attrs: attrs->flags =3D 15
> libssh2_sftp_open_ex(sf->sftp, (char*)pv_file, len_file, l_flags,
> mode, 0) -> 0x0
> libssh2_sftp_open_ex(sf->sftp, (char*)pv_file, len_file, l_flags,
> mode, 0) -> 0x0
> libssh2_sftp_open_ex(sf->sftp, (char*)pv_file, len_file, l_flags,
> mode, 0) -> 0x0
> libssh2_sftp_open_ex(sf->sftp, (char*)pv_file, len_file, l_flags,
> mode, 0) -> 0x0
> Net::SSH2::SFTP::DESTROY
> Net::SSH2::SFTP::DESTROY freeing session
> Net::SSH2::DESTROY
> [debug] end ssh session
>
> The second session does find files it needs to pull down, and calls
> scp_get to copy them. Notice the destructor is NOT getting called =
at
> the end.
>
> [debug] start ssh session
> libssh2_sftp_init(ss->session) -> 0xab1d610
> libssh2_sftp_open_ex(sf->sftp, (char*)pv_file, len_file, l_flags,
> mode, 0) -> 0xa7cdc88
> libssh2_scp_recv(ss->session, path, &st) -> 0xcc0aa88
> Net::SSH2::Channel::read(size =3D 1736739, ext =3D 0)
> - read 1736739 total
> Net::SSH2::Channel::read(size =3D 1, ext =3D 0)
> - read 1 bytes
> - read 1 total
> libssh2_sftp_open_ex(sf->sftp, (char*)pv_file, len_file, l_flags,
> mode, 0) -> 0xc403f38
> libssh2_scp_recv(ss->session, path, &st) -> 0xb50bae8
> Net::SSH2::Channel::read(size =3D 826046, ext =3D 0)
> - read 826046 total
> Net::SSH2::Channel::read(size =3D 1, ext =3D 0)
> - read 1 bytes
> - read 1 total
> libssh2_sftp_open_ex(sf->sftp, (char*)pv_file, len_file, l_flags,
> mode, 0) -> 0xa7d2b60
> libssh2_scp_recv(ss->session, path, &st) -> 0xafb63c8
> Net::SSH2::Channel::read(size =3D 28231, ext =3D 0)
> - read 28231 total
> Net::SSH2::Channel::read(size =3D 1, ext =3D 0)
> - read 1 bytes
> - read 1 total
> [debug] end ssh session
>
> We have another process similar to this one that opens a shell
> channel, which suffers from the same problem. Even when the channe=
l
> object goes out of scope in our program, its destructor is not call=
ed,
> and so the Net::SSH2 object is not destroyed either.
>
> Any help is appreciated.
>
> --
> Stephen Clouse <ste...@gm...>
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--=20
"A foolish consistency is the hobgoblin of little minds,
adored by little statesmen and philosophers and divines."
-- Ralph Waldo Emerson
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