On 07/19/2011 05:37 PM, Thomas Gleixner wrote:
 
>    What's needed?
> 
>    - Testing, testing, testing ... you know the drill (good bug
>      reports are 98% of the solution)
>

Hi Thomas,

I built 3.0.0-rc7-rt0 for a dual socket xeon x5680 (12 cores, 24 threads), .config attached.
Boot stalls here:

...
[    0.000000] Memory: 16437520k/17825792k available (5986k kernel code, 1057692k absent, 330580k reserved, 5056k data, 836k init)
[    0.000000] Preemptible hierarchical RCU implementation.
[    0.000000] NR_IRQS:4352 nr_irqs:1280 16
[    0.000000] Extended CMOS year: 2000
[    0.000000] Console: colour VGA+ 80x25
[    0.000000] console [tty0] enabled

<sits here for ~60 seconds>

and then panics here:

...
[    3.796919]  #15
[    3.796922] smpboot cpu 15: start_ip = 94000
[    7.968781] calibrate_delay_direct() dropping max bogoMips estimate 4 = 13415462280
[   32.100916]  #16
[   32.100918] smpboot cpu 16: start_ip = 94000
[   37.142660] CPU16: Stuck ??
[   60.254968]  #17
[   60.254969] smpboot cpu 17: start_ip = 94000
[   65.296549] CPU17: Stuck ??
[   88.409060]  Ok.
[   88.409061] Booting Node   1, Processors  #18
[   88.409063] smpboot cpu 18: start_ip = 94000
[   92.431055] BUG: unable to handle kernel NULL pointer dereference at           (null)
[   92.431058] IP: [<ffffffff81154b2f>] kfree+0x15f/0x2f0
[   92.431063] PGD 0 
[   92.431065] Oops: 0000 [#1] PREEMPT SMP 
[   92.431067] CPU 16 
[   92.431068] Modules linked in:
[   92.431069] 
[   92.431071] Pid: 0, comm: kworker/0:1 Not tainted 3.0.0-rc7-rt0+ #1 Supermicro X8DTL/X8DTL
[   92.431074] RIP: 0010:[<ffffffff81154b2f>]  [<ffffffff81154b2f>] kfree+0x15f/0x2f0
[   92.431077] RSP: 0000:ffff880227081e08  EFLAGS: 00010046
[   92.431078] RAX: 0000000000000000 RBX: ffff88023f800580 RCX: ffff880227623c40
[   92.431080] RDX: 0200000000000080 RSI: 0000000000000000 RDI: ffff88022778b3c0
[   92.431082] RBP: ffff880227081e48 R08: 0000000000000001 R09: 0000000000000000
[   92.431084] R10: 0000000000000009 R11: 00000000ffffffff R12: 0000000000000000
[   92.431085] R13: ffff88022778b3c0 R14: 0000000000000000 R15: 0000000000000000
[   92.431087] FS:  0000000000000000(0000) GS:ffff88023fd40000(0000) knlGS:0000000000000000
[   92.431090] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   92.431091] CR2: 0000000000000000 CR3: 0000000001a06000 CR4: 00000000000006e0
[   92.431093] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   92.431095] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   92.431097] Process kworker/0:1 (pid: 0, threadinfo ffff880227080000, task ffff88022707e1c0)
[   92.431099] Stack:
[   92.431100]  000000000000bb18 ffff88022778b3c0 0000000000000000 000000000000bc58
[   92.431102]  0000000000000010 0000000000000009 ffff88023fd4ad80 000000000000ad80
[   92.431105]  ffff880227081ea8 ffffffff8101c575 ffff880227081e88 ffffffff8102042b
[   92.431107] Call Trace:
[   92.431112]  [<ffffffff8101c575>] intel_pmu_cpu_starting+0x125/0x1b0
[   92.431114]  [<ffffffff8102042b>] ? __mcheck_cpu_init_timer+0xbb/0xc0
[   92.431118]  [<ffffffff815c1645>] x86_pmu_notifier+0x57/0x65
[   92.431121]  [<ffffffff815d1326>] notifier_call_chain+0x56/0x80
[   92.431125]  [<ffffffff81089a5e>] __raw_notifier_call_chain+0xe/0x10
[   92.431128]  [<ffffffff810610f0>] __cpu_notify+0x20/0x40
[   92.431131]  [<ffffffff815c4cda>] notify_cpu_starting+0x29/0x2b
[   92.431133]  [<ffffffff815c3435>] start_secondary+0x112/0x1c9
[   92.431134] Code: 0f 88 63 01 00 00 48 8b 10 84 d2 0f 89 54 01 00 00 48 8b 40 30 44 0f b7 78 28 65 8b 04 25 08 d5 00 00 41 39 c7 0f 85 cd 00 00 00 
[   92.431145]  8b 06 41 3b 46 04 0f 83 ad 00 00 00 89 c2 83 c0 01 4d 89 6c 
[   92.431150] RIP  [<ffffffff81154b2f>] kfree+0x15f/0x2f0
[   92.431152]  RSP <ffff880227081e08>
[   92.431153] CR2: 0000000000000000
[   93.030473] ---[ end trace 0000000000000001 ]---
[   93.030475] Kernel panic - not syncing: Attempted to kill the idle task!
[   93.030478] Pid: 0, comm: kworker/0:1 Tainted: G      D     3.0.0-rc7-rt0+ #1
[   93.030479] Call Trace:
[   93.030482]  [<ffffffff815cab60>] panic+0x9b/0x1a8
[   93.030484]  [<ffffffff81064093>] do_exit+0x6d3/0x910
[   93.030487]  [<ffffffff8105f732>] ? kmsg_dump+0xd2/0x110
[   93.030489]  [<ffffffff815ceec0>] oops_end+0xb0/0xf0
[   93.030492]  [<ffffffff8103c70b>] no_context+0xfb/0x260
[   93.030494]  [<ffffffff8103c995>] __bad_area_nosemaphore+0x125/0x1e0
[   93.030497]  [<ffffffff8103ca63>] bad_area_nosemaphore+0x13/0x20
[   93.030499]  [<ffffffff815d0f16>] do_page_fault+0x336/0x550
[   93.030502]  [<ffffffff815bea77>] ? cpuid4_cache_lookup_regs+0x3bf/0x427
[   93.030504]  [<ffffffff815ce245>] page_fault+0x25/0x30
[   93.030507]  [<ffffffff81154b2f>] ? kfree+0x15f/0x2f0
[   93.030509]  [<ffffffff81154ade>] ? kfree+0x10e/0x2f0
[   93.030511]  [<ffffffff8101c575>] intel_pmu_cpu_starting+0x125/0x1b0
[   93.030514]  [<ffffffff8102042b>] ? __mcheck_cpu_init_timer+0xbb/0xc0
[   93.030516]  [<ffffffff815c1645>] x86_pmu_notifier+0x57/0x65
[   93.030518]  [<ffffffff815d1326>] notifier_call_chain+0x56/0x80
[   93.030521]  [<ffffffff81089a5e>] __raw_notifier_call_chain+0xe/0x10
[   93.030523]  [<ffffffff810610f0>] __cpu_notify+0x20/0x40
[   93.030525]  [<ffffffff815c4cda>] notify_cpu_starting+0x29/0x2b
[   93.030527]  [<ffffffff815c3435>] start_secondary+0x112/0x1c9



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