Hi Oza,

Could you please provide some details steps to reproduce the issue?

SPDK take in charge  for hotplug only after you bind the device to uio or vfio driver,

so for the new insert deivce, it will handled by kernel driver first.

-Cunyin

From: SPDK [mailto:spdk-bounces@lists.01.org] On Behalf Of Oza Oza
Sent: Tuesday, August 29, 2017 4:22 PM
To: Storage Performance Development Kit <spdk@lists.01.org>
Subject: [SPDK] PCI hotplug and SPDK

Hi All,

PCI hotplug support; requires creation of root bus and probe to go ahead with all PCIe configuration.

Which means following APIs ae not called.

   pci_stop_root_bus(bus);

   pci_remove_root_bus(bus);

And then If I run SPDK, It makes system crash with following info.

Note: if the disk is connected then SPDK is fine.

Otherwise it stalls the system with following crash.

root@bcm958742k:~# echo 2048 > /proc/sys/vm/nr_hugepages; /usr/share/spdk/scripts/setup.sh

grep: /usr/share/spdk/scripts/../include/spdk/pci_ids.h: No such[   34.621325] pci 0008:00:00.0: PCI bridge to [bus 01]

file or directory

[   34.640586] pci 0000:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring

[   50.267056] pci 0000:00:00.0: PCI bridge to [bus 01]

[   50.272337] pci 0001:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring

[   65.898762] pci 0001:00:00.0: PCI bridge to [bus 01]

[   65.904015] pci 0006:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring

[   81.530437] pci 0006:00:00.0: PCI bridge to [bus 01]

[   81.535680] pci 0007:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring

[   97.162103] pci 0007:00:00.0: PCI bridge to [bus 01]

[   97.167255] Bad mode in Error handler detected on CPU6, code 0xbf000002 -- SError

[   97.174974] Internal error: Oops - bad mode: 0 [#1] SMP

[   97.180364] Modules linked in:

[   97.183515] CPU: 6 PID: 2104 Comm: bash Not tainted 4.12.0-01560-gc83093d-dirty #89

[   97.191413] Hardware name: Stingray Combo SVK w/PCIe IOMMU (BCM958742K) (DT)

[   97.198683] task: ffff80a163a40000 task.stack: ffff80a1612b4000

[   97.204790] PC is at 0xffff7cbdfba8

[   97.208387] LR is at 0xffff7cb8f288

[   97.211983] pc : [<0000ffff7cbdfba8>] lr : [<0000ffff7cb8f288>] pstate: 20000000

[   97.219612] sp : 0000fffffe564040

[   97.223029] x29: 0000fffffe564040 x28: 000000001054ce60

[   97.228509] x27: 0000000000000000 x26: 00000000004e2000

[   97.233989] x25: 00000000004e5000 x24: 0000000000000002

[   97.239468] x23: 0000ffff7cc63638 x22: 0000000000000002

[   97.244947] x21: 0000ffff7cc67480 x20: 000000001054db10

[   97.250427] x19: 0000000000000002 x18: 0000000000000000

[   97.255906] x17: 00000000004daac8 x16: 0000000000000000

[   97.261386] x15: 0000000000000096 x14: 0000000000000000

[   97.266865] x13: 0000000000000000 x12: 0000000000000000

[   97.272344] x11: 0000000000000020 x10: 0101010101010101

[   97.277824] x9 : ffffff80ffffffc8 x8 : 0000000000000040

[   97.283303] x7 : 0000000000000001 x6 : 0000ffff7cc669f0

[   97.288782] x5 : 0000000000015551 x4 : 0000000000000888

[   97.294261] x3 : 0000000000000000 x2 : 0000000000000002

[   97.299741] x1 : 000000001054db10 x0 : 0000000000000002

[   97.305220] Process bash (pid: 2104, stack limit = 0xffff80a1612b4000)

[   97.311960] ---[ end trace a1f48abe30820241 ]---

Regards,

Oza.