Peter/Li, Did you get a chance to see this ?
Regards-- Subrata On Mon, 2010-08-02 at 14:22 +0530, Subrata Modak wrote: > Hi, > > The following suspicious rcu_dereference_check() usage is detected > during 2.6.35-stable boot on my ppc64/p7 machine: > > ================================================== > [ 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 > 1 lock held by swapper/1: > #0: (&rq->lock){-.....}, at: [<c0000000007ca2f8>] .init_idle+0x78/0x4a8 > stack backtrace: > Call Trace: > [c000000f392bf990] [c000000000014f04] .show_stack+0xb0/0x1a0 (unreliable) > [c000000f392bfa50] [c0000000007c87b4] .dump_stack+0x28/0x3c > [c000000f392bfad0] [c000000000103e1c] .lockdep_rcu_dereference+0xbc/0xe4 > [c000000f392bfb70] [c0000000007ca434] .init_idle+0x1b4/0x4a8 > [c000000f392bfc30] [c0000000007cad04] .fork_idle+0xa4/0xd0 > [c000000f392bfe30] [c000000000aefaac] .smp_prepare_cpus+0x23c/0x2f4 > [c000000f392bfed0] [c000000000ae1424] .kernel_init+0xec/0x32c > [c000000f392bff90] [c000000000033f40] .kernel_thread+0x54/0x70 > ================================================== > > Please note that this was reported earlier on 2.6.34-rc6: > http://marc.info/?l=linux-kernel&m=127313031922395&w=2, > The issue was fixed with: > commit 1ce7e4ff24fe338438bc7837e02780f202bf202b > Author: Li Zefan <l...@cn.fujitsu.com> > Date: Fri Apr 23 10:35:52 2010 +0800 > cgroup: Check task_lock in task_subsys_state() > > According to: > http://lkml.org/lkml/2010/7/1/883, > commit dc61b1d65e353d638b2445f71fb8e5b5630f2415 > Author: Peter Zijlstra <a.p.zijls...@chello.nl> > Date: Tue Jun 8 11:40:42 2010 +0200 > sched: Fix PROVE_RCU vs cpu_cgroup > should have fixed this. But this is reproducible on 2.6.35-stable. > > Please also see the config file attached. > > Regards-- > Subrata > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev