Re: [ANNOUNCE] 3.0-rt3

Darren Hart
2011-07-25T22:19:55Z

On 07/24/2011 09:12 AM, Thomas Gleixner wrote:
> On Sun, 24 Jul 2011, Maarten Lankhorst wrote:

...

>> Also not sure where this one came from:
>> [ 37.456688] BUG: spinlock bad magic on CPU#3, threaded-ml/1619
>> [ 37.456690] lock: ffff8801fdc74d50, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
>> [ 37.456692] Pid: 1619, comm: threaded-ml Tainted: G C 3.0.0-rt3-patser+ #39
>> [ 37.456693] Call Trace:
>> [ 37.456697] [<ffffffff81607a78>] spin_bug+0xa0/0xa8
>> [ 37.456699] [<ffffffff8132b412>] do_raw_spin_lock+0xa2/0x170
>> [ 37.456702] [<ffffffff8104a201>] ? get_parent_ip+0x11/0x50
>> [ 37.456704] [<ffffffff8160d783>] _raw_spin_lock+0x23/0x30
>> [ 37.456706] [<ffffffff810931ce>] rt_mutex_start_proxy_lock+0x2e/0xd0
>> [ 37.456708] [<ffffffff8109093a>] futex_requeue+0x47a/0x850
>> [ 37.456710] [<ffffffff8109138e>] do_futex+0xae/0xb00
>> [ 37.456712] [<ffffffff81157dcd>] ? fget_light+0x6d/0x110
>> [ 37.456714] [<ffffffff810b77b7>] ? audit_syscall_entry+0x2e7/0x310
>> [ 37.456715] [<ffffffff814c9375>] ? sys_recvmsg+0x75/0x90
>> [ 37.456717] [<ffffffff810923e6>] compat_sys_futex+0xf6/0x190
>> [ 37.456719] [<ffffffff8100e864>] ? syscall_trace_enter+0x184/0x210
>> [ 37.456721] [<ffffffff816158b3>] ia32_do_call+0x13/0x13
>
> Urrgh, that's not a good one. Darren, can you please have a look at that?
>

Will do.

Maarten, what are you running when you hit this?
rt_mutex_start_proxy_lock() is only called by the requeue_pi code and
there is no libc support for that yet, so I'm surprised to see that in
the stack trace (unless you're running my futextest suite).

--
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel