Package: src:linux Version: 3.16.5-1 Severity: normal Tags: patch I appear to have run into a SCTP bug that has been around since 2009: http://sourceforge.net/p/lksctp/mailman/message/23492403/ and has been fixed in mainline as part of commit bdf6fa52f01b941d4a80372d56de465bdbbd1d23.
However, the bug was still visible in the Debian kernel version 3.16.5-1, and I suppose all that's needed is a cherry-pick. It is possible to reproduce as follows: * start a SCTP server socket (bind/listen) on linux * make the client connect to that * accept() the connection on the server * make the client disappear suddenly (e.g. power it down, disconnect its network cable) in a way that there is no handshake to terminate the association * close the server program ** linux sends SHUTDOWN and associated retansmissions * start the server program again * make the client re-connect ** INIT/INIT_ACK/HEARTBEAT/HEARTBEAT_ACK/DT1/SACK messages can be seen in wireshark on the server and traverse nicely to and from the client, but none of that data ever arrives on th socket. The re-started server never even receives any notification about the new connection, thre is subequently no socket being created. I double-checked, no other process had a clone of that socket open from the userspace point of view. The only way I fould to recover was to reboot the server system, which of course is quite annoying. Unloading the sctp kernel module was not an option, as it still had a reference count, despite no SCTP sockets existing anymore in the system. The issue was possible to reproduce several times, so itw as not some strange one-off behavior. -- Package-specific info: ** Version: Linux version 3.16-3-amd64 (debian-ker...@lists.debian.org) (gcc version 4.8.3 (Debian 4.8.3-12) ) #1 SMP Debian 3.16.5-1 (2014-10-10) ** Command line: BOOT_IMAGE=/boot/vmlinuz-3.16-3-amd64 root=UUID=2fa8d876-a03f-447f-bda0-d7f6fed53004 ro ** Not tainted -- System Information: Debian Release: stretch/sid APT prefers unstable APT policy: (500, 'unstable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 3.16-3-amd64 (SMP w/2 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/bash Init: systemd (via /run/systemd/system) Versions of packages linux-image-3.16-3-amd64 depends on: ii debconf [debconf-2.0] 1.5.57 ii initramfs-tools [linux-initramfs-tool] 0.120 ii kmod 21-1 ii linux-base 4.0 ii module-init-tools 21-1 Versions of packages linux-image-3.16-3-amd64 recommends: ii firmware-linux-free 3.4 Versions of packages linux-image-3.16-3-amd64 suggests: pn debian-kernel-handbook <none> ii extlinux 3:6.03+dfsg-10 ii grub-pc 2.02~beta2-26 pn linux-doc-3.16 <none> Versions of packages linux-image-3.16-3-amd64 is related to: pn firmware-atheros <none> pn firmware-bnx2 <none> pn firmware-bnx2x <none> pn firmware-brcm80211 <none> pn firmware-intelwimax <none> pn firmware-ipw2x00 <none> pn firmware-ivtv <none> ii firmware-iwlwifi 0.44 pn firmware-libertas <none> pn firmware-linux <none> pn firmware-linux-nonfree <none> pn firmware-myricom <none> pn firmware-netxen <none> pn firmware-qlogic <none> ii firmware-ralink 0.44 pn firmware-realtek <none> pn xen-hypervisor <none> -- debconf information: linux-image-3.16-3-amd64/postinst/depmod-error-initrd-3.16-3-amd64: false linux-image-3.16-3-amd64/prerm/removing-running-kernel-3.16-3-amd64: true linux-image-3.16-3-amd64/postinst/mips-initrd-3.16-3-amd64:
