That's a really weird one.
This is for an unusual code path: it's an OpenFlow packet-out, that gets
executed via dpif_netdev, which causes recirculation, which installs a
new datapath flow. I wonder whether somehow this bypasses a normal
initialization step through some weirdness.
Does it make any difference if you change
udpif->ukeys = xmalloc(N_UMAPS * sizeof *udpif->ukeys);
to
udpif->ukeys = xzalloc(N_UMAPS * sizeof *udpif->ukeys);
e.g. xmalloc -> xzalloc, in udpif_create()? That might give us
some information.
Thanks,
Ben.
On Fri, May 13, 2016 at 06:58:49PM -0700, William Tu wrote:
> Hi,
>
> Valgrind testcase 2029: ovn -- 3 HVs, 3 LS, 3 lports/LS, 1 LR reports
> acquiring an uninitialized mutex_lock at ovs_mutex_lock(&umap->mutex). It
> seems that udpif_create() already initializes all the mutex_lock of
> udpif->ukeys. I have no clue about how to solve it. Any comments are
> appreciated.
>
> Command: ovs-vswitchd --enable-dummy=system -vvconn -vofproto_dpif
> -vunixctl -vconsole:off --detach --no-chdir --pidfile --log-file
>
> ==32048== Use of uninitialised value of size 8
> ==32048== at 0x4C023C: ovs_mutex_lock_at (ovs-thread.c:76)
> ==32048== by 0x43486F: ukey_install_start (ofproto-dpif-upcall.c:1572)
> ==32048== by 0x434BE7: ukey_install (ofproto-dpif-upcall.c:1634)
> ==32048== by 0x434BE7: upcall_cb (ofproto-dpif-upcall.c:1174)
> ==32048== by 0x458AF3: dp_netdev_upcall.isra.20 (dpif-netdev.c:3265)
> ==32048== by 0x45CD90: fast_path_processing (dpif-netdev.c:3518)
> ==32048== by 0x45D62F: dp_netdev_input__ (dpif-netdev.c:3623)
> ==32048== by 0x45E06E: dp_netdev_recirculate (dpif-netdev.c:3647)
> ==32048== by 0x45E06E: dp_execute_cb (dpif-netdev.c:3842)
> ==32048== by 0x4820EA: odp_execute_actions (odp-execute.c:533)
> ==32048== by 0x45E94B: dp_netdev_execute_actions (dpif-netdev.c:3882)
> ==32048== by 0x45E94B: dpif_netdev_execute (dpif-netdev.c:2368)
> ==32048== by 0x45E94B: dpif_netdev_operate (dpif-netdev.c:2397)
> ==32048== by 0x46043B: dpif_operate (dpif.c:1228)
> ==32048== by 0x460B37: dpif_execute.part.14 (dpif.c:1193)
> ==32048== by 0x460C91: dpif_execute (dpif.c:1185)
> ==32048== by 0x460C91: dpif_execute_helper_cb (dpif.c:1132)
> ==32048== by 0x4820EA: odp_execute_actions (odp-execute.c:533)
> ==32048== by 0x4603C1: dpif_execute_with_help (dpif.c:1169)
> ==32048== by 0x4603C1: dpif_operate (dpif.c:1283)
> ==32048== by 0x460B37: dpif_execute.part.14 (dpif.c:1193)
> ==32048== by 0x428CE0: ofproto_dpif_execute_actions__
> (ofproto-dpif.c:3718)
> ==32048== by 0x428DAA: ofproto_dpif_execute_actions (ofproto-dpif.c:3735)
> ==32048== by 0x428DAA: packet_out (ofproto-dpif.c:4385)
> ==32048== by 0x41C5E1: handle_packet_out (ofproto.c:3395)
> ==32048== by 0x420B0A: handle_openflow__ (ofproto.c:7219)
> ==32048== by 0x420B0A: handle_openflow (ofproto.c:7383)
> ==32048== by 0x444D22: ofconn_run (connmgr.c:1376)
> ==32048== by 0x444D22: connmgr_run (connmgr.c:320)
>
> Regards,
> William
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