On 3.10.27, loading and then unloading the sit module gives me the
following bug:
[ 35.400878] sit: IPv6 over IPv4 tunneling driver
[ 36.959308] ------------[ cut here ]------------
[ 36.963983] WARNING: at
/home/rostedt/work/git/linux-rt.git/lib/list_debug.c:59
__list_del_entry+0xa1/0xd0()
[ 36.973874] list_del corruption. prev->next should be ffff88011656d070, but
was ffff880115fe5ea8
[ 36.982684] Modules linked in: sit(-) ip_tunnel tunnel4 bnep lockd bluetooth
nf_conntrack_ipv4 ip6t_REJECT nf_defrag_ipv4 nf_conntrack_ipv6 nf_defrag_ipv6
xt_state nf_conntrack ip6table_filter ip6_tables snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_intel snd_hda_codec tpm_infineon snd_hwdep hp_wmi
rfkill tpm_tis tpm coretemp snd_seq lpc_ich snd_seq_device snd_pcm
sparse_keymap uinput serio_raw pcspkr mfd_core tpm_bios i2c_i801 microcode wmi
snd_page_alloc snd_timer snd soundcore i915 e1000e i2c_algo_bit ptp
drm_kms_helper crc32c_intel drm pps_core i2c_core video sunrpc
[ 37.034430] CPU: 0 PID: 1071 Comm: rmmod Not tainted 3.10.27-test #143
[ 37.040972] Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS
K01 v02.05 05/07/2012
[ 37.049962] ffffffff81a10e78 ffff880115fe5d18 ffffffff8161b3c7
ffff880115fe5d58
[ 37.057439] ffffffff8104b2a0 ffff880115fe5dd8 ffff880115fe5df8
ffff88011656d070
[ 37.064911] 0000000000000080 0000000000000018 ffff880115cb4000
ffff880115fe5db8
[ 37.072405] Call Trace:
[ 37.074869] [<ffffffff8161b3c7>] dump_stack+0x19/0x1b
[ 37.080031] [<ffffffff8104b2a0>] warn_slowpath_common+0x70/0xa0
[ 37.086051] [<ffffffff8104b386>] warn_slowpath_fmt+0x46/0x50
[ 37.091814] [<ffffffff812f56a1>] __list_del_entry+0xa1/0xd0
[ 37.097491] [<ffffffff815168a5>] unregister_netdevice_queue+0x35/0xa0
[ 37.104036] [<ffffffffa038df82>] sit_exit_net+0xc2/0xf0 [sit]
[ 37.109893] [<ffffffff81511278>] ops_exit_list.isra.4+0x38/0x60
[ 37.115917] [<ffffffff815113d0>] unregister_pernet_operations+0x70/0xb0
[ 37.122633] [<ffffffff8151143e>] unregister_pernet_device+0x2e/0x60
[ 37.129005] [<ffffffffa038f86f>] sit_cleanup+0x2d/0x7be [sit]
[ 37.134864] [<ffffffff810b0aee>] SyS_delete_module+0x19e/0x2a0
[ 37.140801] [<ffffffff8162983b>] tracesys+0xdd/0xe2
[ 37.145779] ---[ end trace e45e22e840e55d00 ]---
[ 37.150427] ------------[ cut here ]------------
Investigating differences between 3.10.27 and newer kernels, I found
that the below change is not there. It was part of commit 205983c43700
"sit: allow to use rtnl ops on fb tunnel" which happens to be
backported to 3.10 but in 3.10 backport commit 20300db1bd1b9 this part
of the commit is missing.
When I add this change, the removing of the module no longer gives this
bug.
Signed-off-by: Steven Rostedt <rost...@goodmis.org>
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 0491264..02300e8 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1592,7 +1592,6 @@ static void __net_exit sit_exit_net(struct net *net)
rtnl_lock();
sit_destroy_tunnels(sitn, &list);
- unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
unregister_netdevice_many(&list);
rtnl_unlock();
}
--
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