On Wed, Nov 19, 2014 at 11:09:46AM +0100, Heiko Carstens wrote: > Hi Kirill, > > the problem below has already been reported here: > https://lkml.org/lkml/2014/11/11/505 > > but seems there is still no fix available upstream? > Would be good to have it soon, since this basically renders lockdep unusable.
This one fixes this bug for me: https://lkml.org/lkml/2014/11/4/613 Thanx, Paul > [ 0.173906] =============================== > [ 0.173907] [ INFO: suspicious RCU usage. ] > [ 0.173909] 3.18.0-rc5 #15 Not tainted > [ 0.173909] ------------------------------- > [ 0.173910] kernel/sched/core.c:7449 suspicious rcu_dereference_check() > usage! > [ 0.173912] > other info that might help us debug this: > [ 0.173913] > rcu_scheduler_active = 1, debug_locks = 0 > [ 0.173914] 2 locks held by swapper/0/0: > [ 0.173915] #0: (&p->pi_lock){......}, at: [<000000000017baae>] > task_rq_lock+0x4e/0xf8 > [ 0.173925] #1: (&rq->lock){......}, at: [<000000000017bad6>] > task_rq_lock+0x76/0xf8 > [ 0.173928] > [ 0.173930] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.18.0-rc5 #15 > [ 0.173931] 0000000000b9fb70 0000000000b9fb80 0000000000000002 > 0000000000000000 > 0000000000b9fc10 0000000000b9fb88 0000000000b9fb88 > 0000000000112638 > 0000000000000000 00000000009d5b8c 00000000009be240 > 000000000000000b > 0000000000b9fbd0 0000000000b9fb70 0000000000000000 > 0000000000000000 > 0000000000000000 0000000000112638 0000000000b9fb70 > 0000000000b9fbd0 > [ 0.173944] Call Trace: > [ 0.173947] ([<000000000011251c>] show_trace+0xf4/0x158) > [ 0.173949] [<00000000001125ea>] show_stack+0x6a/0xe8 > [ 0.173952] [<0000000000807ac2>] dump_stack+0x82/0xb0 > [ 0.173955] [<000000000018700a>] sched_move_task+0x20a/0x210 > [ 0.173959] [<0000000000203bf0>] cgroup_post_fork+0x60/0x148 > [ 0.173963] [<000000000014c5b8>] copy_process.part.46+0xfe8/0x1bc8 > [ 0.173964] [<000000000014d39c>] do_fork+0x104/0x7d8 > [ 0.173965] [<000000000014dab6>] kernel_thread+0x46/0x58 > [ 0.173968] [<00000000007fe890>] rest_init+0x38/0x170 > [ 0.173971] [<0000000000c45b40>] start_kernel+0x460/0x470 > [ 0.173972] [<0000000000100020>] _stext+0x20/0x80 > [ 0.173973] INFO: lockdep is turned off. > > caused by (bisected): > > commit eeb61e53ea19be0c4015b00b2e8b3b2185436f2b > Author: Kirill Tkhai <[email protected]> > Date: Mon Oct 27 14:18:25 2014 +0400 > > sched: Fix race between task_group and sched_task_group > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
