https://bugzilla.kernel.org/show_bug.cgi?id=67751
Bug ID: 67751
Summary: Stack trace with suspicious RCU usage, when starting
ovs-switchd
Product: Virtualization
Version: unspecified
Kernel Version: 3.13.0-0.rc4.git5.1.fc21.x86_64
Hardware: All
OS: Linux
Tree: Fedora
Status: NEW
Severity: normal
Priority: P1
Component: kvm
Assignee: virtualization_...@kernel-bugs.osdl.org
Reporter: kashyap...@gmail.com
Regression: No
I see the below on serial console of a Fedora-20 virtual machine when I boot
into Kernel 3.13.0-0.rc4.git5.1.fc21.x86_64:
---------------------
.
.
.
[ 26.327387]
[ 26.328384] ===============================
[ 26.330206] [ INFO: suspicious RCU usage. ]
[ 26.332044] 3.13.0-0.rc4.git5.1.fc21.x86_64 #1 Not tainted
[ 26.334460] -------------------------------
[ 26.336286] net/openvswitch/flow_table.c:436 suspicious
rcu_dereference_check() usage!
[ 26.339609]
[ 26.339609] other info that might help us debug this:
[ 26.339609]
[ 26.342996]
[ 26.342996] rcu_scheduler_active = 1, debug_locks = 0
[ 26.345794] 2 locks held by ovs-vswitchd/720:
[ 26.347643] #0: (cb_lock){++++++}, at: [<ffffffff816535c9>]
genl_rcv+0x19/0x40
[ 26.351695] #1: (ovs_mutex){+.+.+.}, at: [<ffffffffa0187dc9>]
ovs_flow_cmd_new_or_set+0xf9/0x600 [openvswitch]
[ 26.356970]
[ 26.356970] stack backtrace:
[ 26.358825] CPU: 1 PID: 720 Comm: ovs-vswitchd Not tainted
3.13.0-0.rc4.git5.1.fc21.x86_64 #1
[ 26.362207] Hardware name: Red Hat KVM, BIOS Bochs 01/01/2011
[ 26.364499] 0000000000000001 ffff880499af37e0 ffffffff8175b6d2
ffff8800da5ab3a0
[ 26.368323] ffff880499af3810 ffffffff810cd2f7 ffff8804a29c9ea0
ffff880499af387c
[ 26.372140] ffff8804986f8a10 ffff8804986f89f0 ffff880499af3860
ffffffffa018f608
[ 26.375929] Call Trace:
[ 26.377070] [<ffffffff8175b6d2>] dump_stack+0x4d/0x66
[ 26.379340] [<ffffffff810cd2f7>] lockdep_rcu_suspicious+0xe7/0x120
[ 26.381818] [<ffffffffa018f608>] ovs_flow_tbl_lookup+0x188/0x1b0
[openvswitch]
[ 26.384835] [<ffffffffa0187e06>] ovs_flow_cmd_new_or_set+0x136/0x600
[openvswitch]
[ 26.387961] [<ffffffff816552c1>] ? genl_family_rcv_msg+0x2c1/0x370
[ 26.390506] [<ffffffff8165518d>] genl_family_rcv_msg+0x18d/0x370
[ 26.393025] [<ffffffff81655370>] ? genl_family_rcv_msg+0x370/0x370
[ 26.395811] [<ffffffff816553fe>] genl_rcv_msg+0x8e/0xd0
[ 26.398045] [<ffffffff81653079>] netlink_rcv_skb+0xa9/0xc0
[ 26.400416] [<ffffffff816535d8>] genl_rcv+0x28/0x40
[ 26.402561] [<ffffffff816526a5>] netlink_unicast+0xd5/0x1a0
[ 26.404971] [<ffffffff81652aa7>] netlink_sendmsg+0x337/0x750
[ 26.407294] [<ffffffff81600cab>] sock_sendmsg+0x8b/0xc0
[ 26.409646] [<ffffffff811a7dbf>] ? might_fault+0x5f/0xb0
[ 26.411851] [<ffffffff811a7e08>] ? might_fault+0xa8/0xb0
[ 26.414103] [<ffffffff811a7dbf>] ? might_fault+0x5f/0xb0
[ 26.416280] [<ffffffff81610a5e>] ? verify_iovec+0x5e/0xe0
[ 26.418645] [<ffffffff81601109>] ___sys_sendmsg+0x3d9/0x3f0
[ 26.421138] [<ffffffff810575e7>] ? kvm_clock_read+0x27/0x40
[ 26.423483] [<ffffffff81021a59>] ? sched_clock+0x9/0x10
[ 26.425726] [<ffffffff810b64cd>] ? sched_clock_local+0x1d/0x80
[ 26.428104] [<ffffffff810b6658>] ? sched_clock_cpu+0xa8/0x100
[ 26.430515] [<ffffffff810cb4cd>] ? trace_hardirqs_off+0xd/0x10
[ 26.432914] [<ffffffff810b679f>] ? local_clock+0x5f/0x70
[ 26.435118] [<ffffffff810cc07f>] ? lock_release_holdtime.part.29+0xf/0x190
[ 26.439405] [<ffffffff8121c85d>] ? fget_light+0xed/0x4f0
[ 26.441705] [<ffffffff8121c7ac>] ? fget_light+0x3c/0x4f0
[ 26.444102] [<ffffffff81602662>] __sys_sendmsg+0x42/0x80
[ 26.446293] [<ffffffff816026b2>] SyS_sendmsg+0x12/0x20
[ 26.448435] [<ffffffff8176e329>] system_call_fastpath+0x16/0x1b
.
.
.
---------------------
[This virtual machine has Open vSwitch daemon and a bunch of other OpenStack
networking components running.]
I filed this here first -- https://bugzilla.redhat.com/show_bug.cgi?id=1046286
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