On 07/25/2011 03:20 PM, Darren Hart wrote: > > > 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). I've run a couple iterations of functional/run.sh from futextest which exercises the requeue_pi code with no errors. I also wrote a new test to improperly use the requeue_pi path, and the kernel properly detects the abuse and kicks the user back with -EINVAL. Could you try running futextest on your system to see if you can reproduce the above? Specifically the functional/run.sh script (no need to run the performance bits). http://git.kernel.org/?p=linux/kernel/git/dvhart/futextest.git;a=summary -- Darren Hart Intel Open Source Technology Center Yocto Project - Linux Kernel -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
