From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 67751] Stack trace with suspicious RCU usage, when starting
ovs-switchd
Date: Tue, 28 Jan 2014 08:28:09 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=67751
--- Comment #3 from Kashyap Chamarthy ---
Still able to reproduce with 3.14.0-0.rc0.git9.1.fc21.x86_64:
---------------------
[ 933.596722] ===============================
[ 933.599241] [ INFO: suspicious RCU usage. ]
[ 933.601825] 3.14.0-0.rc0.git9.1.fc21.x86_64 #1 Not tainted
[ 933.605019] -------------------------------
[ 933.607412] net/openvswitch/flow_table.c:436 suspicious
rcu_dereference_check() usage!
[ 933.611737]
[ 933.611737] other info that might help us debug this:
[ 933.611737]
[ 933.616302]
[ 933.616302] rcu_scheduler_active = 1, debug_locks = 0
[ 933.619503] 2 locks held by ovs-vswitchd/729:
[ 933.621820] #0: (cb_lock){++++++}, at: []
genl_rcv+0x19/0x40
[ 933.626678] #1: (ovs_mutex){+.+.+.}, at: []
ovs_flow_cmd_new_or_set+0xea/0x5e0 [openvswitch]
[ 933.632616]
[ 933.632616] stack backtrace:
[ 933.634813] CPU: 18 PID: 729 Comm: ovs-vswitchd Not tainted
3.14.0-0.rc0.git9.1.fc21.x86_64 #1
[ 933.638912] Hardware name: Red Hat KVM, BIOS Bochs 01/01/2011
[ 933.641710] 0000000000000001 ffff8804aef0f7e8 ffffffff81793c95
ffff8804aed68000
[ 933.646034] ffff8804aef0f818 ffffffff810f0227 ffff8800c4286338
ffff8804aef0f884
[ 933.650781] ffff8804ae77ba18 ffff8804ae77b9f8 ffff8804aef0f868
ffffffffa0217548
[ 933.655559] Call Trace:
[ 933.657021] [] dump_stack+0x4d/0x66
[ 933.659752] [] lockdep_rcu_suspicious+0xe7/0x120
[ 933.662843] [] ovs_flow_tbl_lookup+0x188/0x1b0
[openvswitch]
[ 933.666377] [] ovs_flow_cmd_new_or_set+0x127/0x5e0
[openvswitch]
[ 933.669879] [] ? trace_hardirqs_on_caller+0x105/0x1d0
[ 933.673063] [] ? genl_family_rcv_msg+0x2c1/0x370
[ 933.676001] [] genl_family_rcv_msg+0x18d/0x370
[ 933.678936] [] ? genl_family_rcv_msg+0x370/0x370
[ 933.681919] [] genl_rcv_msg+0x8e/0xd0
[ 933.684516] [] netlink_rcv_skb+0xa9/0xc0
[ 933.687138] [] genl_rcv+0x28/0x40
[ 933.689583] [] netlink_unicast+0xd5/0x1a0
[ 933.692306] [] netlink_sendmsg+0x337/0x750
[ 933.694977] [] sock_sendmsg+0x8b/0xc0
[ 933.697504] [] ? might_fault+0x5f/0xb0
[ 933.700255] [] ? might_fault+0xa8/0xb0
[ 933.702754] [] ? might_fault+0x5f/0xb0
[ 933.705292] [] ? verify_iovec+0x5e/0xe0
[ 933.707888] [] ___sys_sendmsg+0x389/0x3a
[ 933.710357] [] ? kvm_clock_read+0x27/0x40
[ 933.712658] [] ? sched_clock+0x9/0x10
[ 933.714032] [] ? local_clock+0xe/0x30
[ 933.715441] [] ? lock_release_holdtime.part.29+0xf/0x190
[ 933.717454] [] ? fget_light+0xed/0x4f0
[ 933.719799] [] ? fget_light+0x3c/0x4f0
[ 933.721273] [] __sys_sendmsg+0x42/0x80
[ 933.722749] [] SyS_sendmsg+0x12/0x20
[ 933.724359] [] system_call_fastpath+0x16/0x1b
[ 933.774858] device br-tun entered promiscuous mode
[ 936.966368] systemd-udevd (530) used greatest stack depth: 3272 bytes left
Fedora release 20 (Heisenbug)
Kernel 3.14.0-0.rc0.git9.1.fc21.x86_64 on an x86_64 (ttyS0)
---------------------
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