Re: Regression: kexec/kdump boot hangs with x86/vector commits

[Dave Young <dyoung@redhat.com>]

On 12/13/17 at 11:57pm, Yu Chen wrote:
> On Wed, Dec 13, 2017 at 10:52:56AM +0800, Dave Young wrote:
> > Hi,
> > 
> > Kexec reboot and kdump has broken on my laptop for long time with
> > 4.15.0-rc1+ kernels. With the patch below an early panic been fixed:
> > https://patchwork.kernel.org/patch/10084289/
> > 
> > But still can not get a successful reboot, it looked like graphic
> > issue, but after bisecting the kernel, I got below:
> > 
> > [dyoung@dhcp-*-* linux]$ git bisect good
> > There are only 'skip'ped commits left to test.
> > The first bad commit could be any of:
> > 2db1f959d9dc16035f2eb44ed5fdb2789b754d6a
> > 4900be83602b6be07366d3e69f756c1959f4169a
> > We cannot bisect more!
> > 
> > These two commits can no be reverted because of code conflicts, thus
> > I reverted the whole series from Thomas (below commits), with those
> > x86/vector changes reverted, kexec reboot works fine.
> > 
> > Could you help to take a look, any thoughts?  I can do the test
> > if you have some debug patch to try.
> Is it possible that the "second" kernel runs on non-zero CPU? If yes,
> what if some irqs are only delivered to cpu0? (use cpumask_of(0)
> directly)

Thanks for the reply.

For kdump, yes, for kexec, I'm not sure.  

Here is some kexec kernel boot log:
http://people.redhat.com/~ruyang/misc/kexec-regression.txt

Copy the lockup call trace here:
[   23.779285] NMI watchdog: Watchdog detected hard LOCKUP on cpu 0             
[   23.779285] Modules linked in: arc4 rtsx_pci_sdmmc i915 iwlmvm kvm_intel mac8
0211 kvm irqbypass btusb btrtl btbcm intel_gtt btintel drm_kms_helper snd_hda_in
tel syscopyarea bluetooth iwlwifi snd_hda_codec snd_hwdep snd_hda_core sysfillre
ct snd_seq sysimgblt input_leds fb_sys_fops e1000e ecdh_generic cfg80211 snd_seq
_device drm snd_pcm serio_raw ptp pcspkr thinkpad_acpi i2c_i801 snd_timer rtsx_p
ci pps_core snd soundcore rfkill video                                          
[   23.779307] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-rc3+ #378       
[   23.779308] Hardware name: LENOVO 20ARS1BJ02/20ARS1BJ02, BIOS GJET92WW (2.42 
) 03/03/2017                                                                    
[   23.779312] RIP: 0010:poll_idle+0x2f/0x5f                                    
[   23.779313] RSP: 0018:ffffffff81c03e80 EFLAGS: 00000246                      
[   23.779314] RAX: ffffffff81c0f4c0 RBX: ffffffff81c6db80 RCX: 0000000000000000
[   23.779315] RDX: 0000000000000000 RSI: ffffffff81c6db80 RDI: ffff88021f2201e8
[   23.779316] RBP: ffff88021f2201e8 R08: 000000349a65b7dd R09: ffff88021f216db4
[   23.779317] R10: ffffffff81c03e68 R11: 0000000000000000 R12: 0000000000000000
[   23.779318] R13: ffffffff81c6db98 R14: 0000000000000000 R15: 0000000578a065b1
[   23.779319] FS:  0000000000000000(0000) GS:ffff88021f200000(0000) knlGS:00000
00000000000                                                                     
[   23.779320] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033                
[   23.779321] CR2: 00007ffed1d0ee60 CR3: 000000021ec0a006 CR4: 00000000001606b0
[   23.779322] Call Trace:                                                      
[   23.779328]  cpuidle_enter_state+0x6a/0x2c0                                  
[   23.779333]  do_idle+0x17b/0x1d0                                             
[   23.779335]  cpu_startup_entry+0x6f/0x80                                     
[   23.779338]  start_kernel+0x431/0x451                                        
[   23.779342]  secondary_startup_64+0xa5/0xb0                                  
[   23.779344] Code: 00 fb 66 0f 1f 44 00 00 65 48 8b 04 25 40 c4 00 00 f0 80 48
 02 20 48 8b 08 83 e1 08 74 0d eb 12 f3 90 65 48 8b 04 25 40 c4 00 00 <48> 8b 00
 a8 08 74 ee 65 48 8b 04 25 40 c4 00 00 f0 80 60 02 df

Thanks
Dave
> 
> Thanks,
> 	Yu
> 

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