Problem with 2.6.35.4-12.fc14.x86_64

Morten P.D. Stevens mstevens at imt-systems.com
Wed Sep 15 15:44:47 UTC 2010


Hi,

Does anyone know something about this issue?

Setting APIC routing to flat
..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
CPU0: Intel(R) Xeon(R) CPU           X5450  @ 3.00GHz stepping 0a
lockdep: fixing up alternatives.

===================================================
[ 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: [<ffffffff81052b87>] cpu_maps_update_begin+0x17/0x19
 #1:  (cpu_hotplug.lock){+.+.+.}, at: [<ffffffff81052a9a>] cpu_hotplug_begin+0x2c/0x53
 #2:  (&rq->lock){-.-...}, at: [<ffffffff81495b4c>] init_idle+0x30/0x131

stack backtrace:
Pid: 1, comm: swapper Not tainted 2.6.35.4-12.fc14.x86_64 #1
Call Trace:
 [<ffffffff8107bd3a>] lockdep_rcu_dereference+0xaa/0xb3
 [<ffffffff8103fdc5>] task_group+0x80/0x8f
 [<ffffffff8103fdeb>] set_task_rq+0x17/0x73
 [<ffffffff81495c06>] init_idle+0xea/0x131
 [<ffffffff81495fd6>] fork_idle+0x92/0xa3
 [<ffffffff8107e820>] ? mark_held_locks+0x50/0x72
 [<ffffffff81493a77>] do_fork_idle+0x1c/0x2d
 [<ffffffff81493bbf>] do_boot_cpu+0x137/0x9b1
 [<ffffffff81493a5b>] ? do_fork_idle+0x0/0x2d
 [<ffffffff81494c5d>] native_cpu_up+0x100/0x1c2
 [<ffffffff814960af>] _cpu_up+0x9d/0xf9
 [<ffffffff814961de>] cpu_up+0xd3/0xe5
 [<ffffffff81d78d86>] kernel_init+0x105/0x2c9
 [<ffffffff8100aae4>] kernel_thread_helper+0x4/0x10
 [<ffffffff8149d390>] ? restore_args+0x0/0x30
 [<ffffffff81d78c81>] ? kernel_init+0x0/0x2c9
 [<ffffffff8100aae0>] ? kernel_thread_helper+0x0/0x10
Booting Node   0, Processors  #1
mce: CPU supports 0 MCE banks
lockdep: fixing up alternatives.
 #2
mce: CPU supports 0 MCE banks
lockdep: fixing up alternatives.
 #3
mce: CPU supports 0 MCE banks
lockdep: fixing up alternatives.
 #4
mce: CPU supports 0 MCE banks
lockdep: fixing up alternatives.
 #5
mce: CPU supports 0 MCE banks
lockdep: fixing up alternatives.
 #6
mce: CPU supports 0 MCE banks
lockdep: fixing up alternatives.
 #7 Ok.
mce: CPU supports 0 MCE banks
Skipped synchronization checks as TSC is reliable.
Brought up 8 CPUs
Total of 8 processors activated (47880.46 BogoMIPS).
x86 PAT enabled: cpu 6, old 0x0, new 0x7010600070106
x86 PAT enabled: cpu 4, old 0x0, new 0x7010600070106
x86 PAT enabled: cpu 2, old 0x0, new 0x7010600070106
x86 PAT enabled: cpu 1, old 0x0, new 0x7010600070106
x86 PAT enabled: cpu 7, old 0x0, new 0x7010600070106
x86 PAT enabled: cpu 3, old 0x0, new 0x7010600070106
x86 PAT enabled: cpu 5, old 0x0, new 0x7010600070106

Best regards,

Morten


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