[sctp-dev] Linux Kernel Failure (Fedora) and sctp close()

[Christopher Hegarty - Sun Microsystems Ireland]

Danny,

I can say for sure that I never seen this issue before, and it certainly 
looks like the problem is in the lksctp kernel implementation. I think 
you should send the stack trace to lksctp-developers. Or I can do this. 
Is this reproducible? It looks like you are on a fairly recent kernel, good.

On the Java side I can let you know how we are handling closing of the 
sockets.
  1) On initialization of the Java SCTP implementation.
     Create an open connected pair of sockets. Close one and keep the
     other for later closures, preCloseFD.
  2) When closing a specific socket.
     If it is known that the socket is being read from another thread,
     sending on another thread, or is registered with a selector. Dup
     the file descriptor to preCloseFD ( dup2(preCloseFD, fd) ).
  3) When all other threads/selectors are finished with the socket,
     close is called on the underlying file descriptor.

This is a common strategy employed by the Java platform across TCP and 
UDP sockets also in order to support the semantics we required for 
asynchronous closing of these sockets.

-Chris.

On 06/02/2010 11:10, Danny wrote:
> Hi,
>
> Since i use the lksctp lib and the SCTP API (JDK 7), and only since
> starting to use these two, i started having Kernel Failure warnings on
> Fedora 11.
> By looking into the detail i found out that it has something to do with
> closing an sctp socket.
>
> I was wondering if others have this too. I haven't posted the failure
> yet with the Linux Kerel group.
> I would like some feedback from this mailing list to first find out if i
> am the only one and should look into my system or forward the problem.
> I am also not sure if this is lksctp related or SCTP API related. The
> word 'kernel' makes me believe the first one but the cause could be in
> the second one.
>
> Here is the trace :
>
> Kernel failure message 1:
> ------------[ cut here ]------------
> WARNING: at net/ipv4/af_inet.c:155 inet_sock_destruct+0x100/0x11e()
> (Tainted: P W )
> Hardware name: Aspire 8920
> Modules linked in: sctp libcrc32c fuse rfcomm bridge stp llc bnep sco
> l2cap vboxnetadp vboxnetflt vboxdrv sunrpc ip6t_REJECT nf_conntrack_ipv6
> ip6table_filter ip6_tables ipv6 cpufreq_ondemand acpi_cpufreq freq_table
> dm_multipath uinput nvidia(P) btusb snd_hda_codec_realtek bluetooth
> snd_hda_intel snd_hda_codec arc4 ecb snd_hwdep snd_seq snd_seq_device
> iwlagn snd_pcm uvcvideo iwlcore acer_wmi snd_timer rfkill video videodev
> lib80211 i2c_i801 snd mac80211 iTCO_wdt v4l1_compat i2c_core atl1e
> soundcore pcspkr v4l2_compat_ioctl32 wmi serio_raw iTCO_vendor_support
> output joydev snd_page_alloc cfg80211 [last unloaded: microcode]
> Pid: 5010, comm: java Tainted: P W 2.6.30.10-105.2.4.fc11.x86_64 #1
> Call Trace:
> [<ffffffff81049505>] warn_slowpath_common+0x84/0x9c
> [<ffffffff81049531>] warn_slowpath_null+0x14/0x16
> [<ffffffff813921da>] inet_sock_destruct+0x100/0x11e
> [<ffffffff813337ca>] sk_free+0x23/0xf4
> [<ffffffffa0e21dbc>] sctp_close+0x1c1/0x1d0 [sctp]
> <-------------------------------- see here
> [<ffffffff8104e6cc>] ? local_bh_enable_ip+0xe/0x10
> [<ffffffff813db5b8>] ? _write_unlock_bh+0x19/0x1b
> [<ffffffff81391ce4>] inet_release+0x55/0x5c
> [<ffffffffa0b52f32>] inet6_release+0x35/0x3a [ipv6]
> [<ffffffff81330142>] sock_release+0x1f/0x6c
> [<ffffffff813301b6>] sock_close+0x27/0x2b
> [<ffffffff810e4988>] __fput+0xf9/0x1a0
> [<ffffffff810e4a49>] fput+0x1a/0x1c
> [<ffffffff810e1c2d>] filp_close+0x68/0x72
> [<ffffffff810ef880>] sys_dup3+0x11e/0x143
> [<ffffffff810ef8ed>] sys_dup2+0x48/0x4b
> [<ffffffff81010c82>] system_call_fastpath+0x16/0x1b
> ---[ end trace 061fb956b7b1c9d5 ]---
>
>
> Greetz,
> Danny