trinity hang -- rcu_sched detected stall in __schedule

[Vince Weaver]

I'm running the trinity fuzzer on my ARM Pandaboard, Linux 3.11-rc4

Trinity got stuck with these messages being logged.  As far as I can
tell trinity-child1 wasn't doing anything that interesting when it got 
stuck.

Hopefully I picked the right group to cc: it looks like it is stuck
in __schedule somewhere?  So I'm not sure if this is ARM related or a 
general problem.

Vince

[ 5026.161163] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 0, t=2102 jiffies, g=250744, c=250743, q=8)
[ 5026.161163] Task dump for CPU 1:
[ 5026.161163] trinity-child1  R running      0 27485   2810 0x00000000
[ 5026.182922] [<c048cef4>] (__schedule+0x4c4/0x748) from [<00000000>] (  (null))
[ 5089.211090] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 0, t=8407 jiffies, g=250744, c=250743, q=658)
[ 5089.222900] Task dump for CPU 1:
[ 5089.222900] trinity-child1  R running      0 27485   2810 0x00000000
[ 5089.233154] [<c048cef4>] (__schedule+0x4c4/0x748) from [<c0012790>] (no_work_pending+0x8/0x2c)
[ 5152.270843] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 0, t=14712 jiffies, g=250744, c=250743, q=842)
[ 5152.270874] Task dump for CPU 1:
[ 5152.286193] trinity-child1  R running      0 27485   2810 0x00000000
[ 5152.286193] [<c048cef4>] (__schedule+0x4c4/0x748) from [<c0012790>] (no_work_pending+0x8/0x2c)
[ 5215.311096] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 0, t=21017 jiffies, g=250744, c=250743, q=857)
[ 5215.322998] Task dump for CPU 1:
[ 5215.322998] trinity-child1  R running      0 27485   2810 0x00000000
[ 5215.333251] [<c048cef4>] (__schedule+0x4c4/0x748) from [<c0012790>] (no_work_pending+0x8/0x2c)
[ 5278.361083] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 0, t=27322 jiffies, g=250744, c=250743, q=857)
[ 5278.372985] Task dump for CPU 1:
[ 5278.372985] trinity-child1  R running      0 27485   2810 0x00000000
[ 5278.372985] [<c048cef4>] (__schedule+0x4c4/0x748) from [<c0012790>] (no_work_pending+0x8/0x2c)
[ 5341.411102] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 0, t=33627 jiffies, g=250744, c=250743, q=959)
[ 5341.411102] Task dump for CPU 1:
[ 5341.411102] trinity-child1  R running      0 27485   2810 0x00000000
[ 5341.433227] [<c048cef4>] (__schedule+0x4c4/0x748) from [<c0012790>] (no_work_pending+0x8/0x2c)
[ 5404.461090] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 0, t=39932 jiffies, g=250744, c=250743, q=1043)
[ 5404.473083] Task dump for CPU 1:
[ 5404.473083] trinity-child1  R running      0 27485   2810 0x00000000
[ 5404.473083] [<c048cef4>] (__schedule+0x4c4/0x748) from [<c0012790>] (no_work_pending+0x8/0x2c)
[ 5467.530395] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 0, t=46238 jiffies, g=250744, c=250743, q=1056)
[ 5467.530395] Task dump for CPU 1:
[ 5467.530395] trinity-child1  R running      0 27485   2810 0x00000000
[ 5467.545806] [<c048cef4>] (__schedule+0x4c4/0x748) from [<c0012790>] (no_work_pending+0x8/0x2c)
[ 5530.571258] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 0, t=52543 jiffies, g=250744, c=250743, q=1056)
[ 5530.571258] Task dump for CPU 1:
[ 5530.571258] trinity-child1  R running      0 27485   2810 0x00000000
[ 5530.571258] [<c048cef4>] (__schedule+0x4c4/0x748) from [<c0012790>] (no_work_pending+0x8/0x2c)
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