Re: rcu_init allocation failure trace on bootup

[Dave Jones]

On Mon, May 06, 2013 at 12:43:51PM -0700, Paul E. McKenney wrote:
 > On Mon, May 06, 2013 at 03:26:53PM -0400, Dave Jones wrote:
 > > On Mon, May 06, 2013 at 12:05:22PM -0700, Paul E. McKenney wrote:
 > >  > On Mon, May 06, 2013 at 01:56:47PM -0400, Dave Jones wrote:
 > >  > > [    0.000000]  RCU debugfs-based tracing is enabled.
 > >  > > [    0.000000]  RCU lockdep checking is enabled.
 > >  > > [    0.000000] ------------[ cut here ]------------
 > >  > > [    0.000000] WARNING: at mm/nobootmem.c:215 ___alloc_bootmem_nopanic+0x3a/0x7d()
 > >  > > [    0.000000] Modules linked in:
 > >  > > [    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.9.0+ #128
 > >  > > [    0.000000] Hardware name:                  /D975XBX, BIOS BX97510J.86A.1209.2006.0601.1340 06/01/2006
 > >  > > [    0.000000]  ffffffff819f4246 ffffffff81c01e68 ffffffff816a0db2 ffffffff81c01ea8
 > >  > > [    0.000000]  ffffffff8104b1a0 ffffffff819e1078 0000000000000000 0000000000000008
 > >  > > [    0.000000]  ffffffffffffffff 0000000000000040 0000000000000000 ffffffff81c01eb8
 > >  > > [    0.000000] Call Trace:
 > >  > > [    0.000000]  [<ffffffff816a0db2>] dump_stack+0x19/0x1b
 > >  > > [    0.000000]  [<ffffffff8104b1a0>] warn_slowpath_common+0x70/0xa0
 > >  > > [    0.000000]  [<ffffffff8104b1ea>] warn_slowpath_null+0x1a/0x20
 > >  > > [    0.000000]  [<ffffffff81ef8914>] ___alloc_bootmem_nopanic+0x3a/0x7d
 > >  > > [    0.000000]  [<ffffffff81ef8b87>] __alloc_bootmem+0x13/0x39
 > >  > > [    0.000000]  [<ffffffff81f090ad>] alloc_bootmem_cpumask_var+0x1a/0x21
 > >  > > [    0.000000]  [<ffffffff81ef1f5a>] rcu_init+0x7f/0x261
 > >  > > [    0.000000]  [<ffffffff81ef4acb>] ? perf_event_init+0x178/0x181
 > >  > > [    0.000000]  [<ffffffff81ed6c79>] start_kernel+0x232/0x3d3
 > >  > > [    0.000000]  [<ffffffff81ed6846>] ? repair_env_string+0x5e/0x5e
 > >  > > [    0.000000]  [<ffffffff81ed6577>] x86_64_start_reservations+0x2a/0x2c
 > >  > > [    0.000000]  [<ffffffff81ed6646>] x86_64_start_kernel+0xcd/0xd1
 > >  > > [    0.000000] ---[ end trace 0acfc82c197165dd ]---
 > >  > > [    0.000000]  Experimental no-CBs for all CPUs
 > >  > > [    0.000000]  Experimental no-CBs CPUs: 0-1.
 > >  > > [    0.000000] NO_HZ: Full dynticks CPUs: 1.
 > >  > 
 > >  > Do you have commit fa0f93cd6a (rcu: Don't allocate bootmem from rcu_init())?
 > >  > If not, could you please try applying it?
 > > 
 > > That commit isn't in Linus tree.
 > 
 > You are quite right, I am getting ahead of myself.  Please see below
 > for the patch.

Doesn't fix it for me.

Is it this one instead perhaps ?

  89 #ifndef CONFIG_RCU_NOCB_CPU_NONE
  90         if (!have_rcu_nocb_mask) {
  91                 alloc_bootmem_cpumask_var(&rcu_nocb_mask);
  92                 have_rcu_nocb_mask = true;
  93         }


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