2.6.35-1 kernel/sched.c:616 invoked rcu_dereference_check() without protection
Hi,
I downloaded and build this kernel
http://koji.fedoraproject.org/koji/buildinfo?buildID=187678 on my F13
box. I am getting an error on boot. You might be interested in this
===================================================
[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
kernel/sched.c:616 invoked rcu_dereference_check() without protection!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 0
3 locks held by swapper/1:
#0: (cpu_add_remove_lock){+.+.+.}, at: [<ffffffff8105292e>]
cpu_maps_update_begin+0x17/0x19
#1: (cpu_hotplug.lock){+.+.+.}, at: [<ffffffff81052973>]
cpu_hotplug_begin+0x2c/0x53
#2: (&rq->lock){-.-...}, at: [<ffffffff814943a9>] init_idle+0x30/0x136
stack backtrace:
Pid: 1, comm: swapper Not tainted 2.6.35-1.fc13.x86_64 #1
Call Trace:
[<ffffffff8107bb7a>] lockdep_rcu_dereference+0xaa/0xb2
[<ffffffff8104012f>] task_group+0x80/0x8f
[<ffffffff814943a9>] ? init_idle+0x30/0x136
[<ffffffff81040155>] set_task_rq+0x17/0x73
[<ffffffff81494468>] init_idle+0xef/0x136
[<ffffffff81494885>] fork_idle+0xbd/0xce
[<ffffffff8107c243>] ? mark_held_locks+0x52/0x70
[<ffffffff81492e6a>] do_fork_idle+0x1c/0x2d
[<ffffffff81492283>] do_boot_cpu+0x145/0xa3b
[<ffffffff811127ec>] ? alloc_page_interleave+0x79/0x86
[<ffffffff81492e4e>] ? do_fork_idle+0x0/0x2d
[<ffffffff81492c74>] native_cpu_up+0xfb/0x1ce
[<ffffffff81494966>] _cpu_up+0xa0/0x115
[<ffffffff81494ab1>] cpu_up+0xd6/0xe8
[<ffffffff81d78695>] kernel_init+0x105/0x2c9
[<ffffffff8100aaa4>] kernel_thread_helper+0x4/0x10
[<ffffffff8149bfd0>] ? restore_args+0x0/0x30
[<ffffffff81d78590>] ? kernel_init+0x0/0x2c9
[<ffffffff8100aaa0>] ? kernel_thread_helper+0x0/0x10
Booting Node 0, Processors #1lockdep: fixing up alternatives.
#2lockdep: fixing up alternatives.
#3 Ok.
Regards,
M