Bug 1584741

Summary: [Q35] guest kernel panic when boot with 9 nics
Product: [Fedora] Fedora Reporter: Paolo Bonzini <pbonzini>
Component: seabiosAssignee: Fedora Virtualization Maintainers <virt-maint>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 28CC: ailan, chayang, jforbes, jinzhao, juzhang, knoel, lersek, lmiksik, marcel, mrezanin, pbonzini, virt-maint, virt-maint, xfu
Target Milestone: ---   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: seabios-1.11.1-1.fc28 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: 1523166 Environment:
Last Closed: 2018-06-26 17:32:51 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Paolo Bonzini 2018-05-31 14:16:53 UTC 
+++ This bug was initially created as a clone of Bug #1523166 +++

Description of problem:
guest kernel panic when boot with 9 e1000 nics that with io-server=0 

Version-Release number of selected component (if applicable):
[root@localhost test]# uname -r
3.10.0-807.el7.x86_64
[root@localhost test]# rpm -qa |grep qemu-kvm-rhev
qemu-kvm-rhev-debuginfo-2.10.0-11.el7.x86_64
qemu-kvm-rhev-2.10.0-11.el7.x86_64
[root@localhost test]# rpm -qa |grep seabios
seabios-bin-1.11.0-1.el7.noarch
seabios-1.11.0-1.el7.x86_64

How reproducible:
3/3

Steps to Reproduce:
1. Boot up 9 e1000 nics with [1]
2. Check guest status


Actual results:
guest kernel panic

[    0.842671] BUG: unable to handle kernel paging request at fffffffd49d872f0
[    0.843405] IP: [<ffffffffb2ce168d>] cpuacct_charge+0x2d/0x50
[    0.843918] PGD 53e11067 PUD 0 
[    0.844281] Thread overran stack, or stack corrupted
[    0.844690] Oops: 0000 [#1] SMP 
[    0.845058] Modules linked in:
[    0.845369] CPU: 3 PID: 1 Comm: swapper/0 Not tainted 3.10.0-768.el7.x86_64 #1
[    0.845948] Hardware name: Red Hat KVM, BIOS 1.11.0-1.el7 04/01/2014
[    0.847178] task: ffff938f7c7b8000 ti: ffff938f7c7ac000 task.ti: ffff938f7c7ac000
[    0.847790] RIP: 0010:[<ffffffffb2ce168d>]  [<ffffffffb2ce168d>] cpuacct_charge+0x2d/0x50
[    0.848583] RSP: 0000:ffff938f7fd83e40  EFLAGS: 00010046
[    0.849063] RAX: 000000000000fba8 RBX: ffff938f7c7b8068 RCX: ffffffffb2c8b14a
[    0.849689] RDX: ffffffffb38555c0 RSI: 0000000000114ef4 RDI: ffff938f7c7b8000
[    0.850288] RBP: ffff938f7fd83e40 R08: 0000000000000400 R09: 0000000000000400
[    0.850859] R10: 0000000000000004 R11: 0000000000000005 R12: 0000000000114ef4
[    0.851433] R13: ffff938f7fd96e00 R14: ffff938f7c7b8000 R15: 0000000000000000
[    0.852494] FS:  0000000000000000(0000) GS:ffff938f7fd80000(0000) knlGS:0000000000000000
[    0.853238] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[    0.853706] CR2: fffffffd49d872f0 CR3: 0000000053e0e000 CR4: 00000000000006e0
[    0.854282] Call Trace:
[    0.854505]  <IRQ> 
[    0.854691]  [<ffffffffb2cd06b4>] update_curr+0x104/0x190
[    0.855734]  [<ffffffffb2cd1bbd>] task_tick_fair+0x2bd/0x660
[    0.856446]  [<ffffffffb2c347a9>] ? sched_clock+0x9/0x10
[    0.857139]  [<ffffffffb2cca535>] ? sched_clock_cpu+0x85/0xc0
[    0.857855]  [<ffffffffb2cc5c17>] scheduler_tick+0xc7/0x150
[    0.858600]  [<ffffffffb2c9d085>] update_process_times+0x65/0x80
[    0.859380]  [<ffffffffb2cf438b>] tick_periodic+0x2b/0x90
[    0.860119]  [<ffffffffb2cf4411>] tick_handle_periodic+0x21/0x80
[    0.860900]  [<ffffffffb2c55195>] local_apic_timer_interrupt+0x35/0x60
[    0.861741]  [<ffffffffb32dae7d>] smp_apic_timer_interrupt+0x3d/0x50
[    0.862566]  [<ffffffffb32d935d>] apic_timer_interrupt+0x6d/0x80
[    0.863335]  <EOI> 
[    0.863522]  [<ffffffffb32cee55>] ? _raw_spin_unlock_irqrestore+0x15/0x20
[    0.864753]  [<ffffffffb2f6db26>] pci_bus_write_config_word+0x66/0x80
[    0.865568]  [<ffffffffb2f725a5>] pci_scan_bridge+0x2b5/0x6a0
[    0.866330]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.867150]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.867912]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.868674]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.869488]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.870267]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.871021]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.871833]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.872614]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.873364]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.874193]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.874958]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.875707]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.876527]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.877302]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.878084]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.878891]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.879668]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.880418]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.881244]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.882645]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.883367]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.884142]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.884831]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.885572]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.886369]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.887147]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.887907]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.888714]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.889507]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.890262]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.891090]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.891854]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.892573]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.893334]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.894066]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.894784]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.895586]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.896360]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.897125]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.897945]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.898706]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.899450]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.900236]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.901012]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.901770]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.902598]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.903351]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.904115]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.904932]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.905695]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.906488]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.907306]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.908092]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.908843]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.909673]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.910426]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.911189]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.912539]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.913459]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.914187]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.914948]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.915719]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.916458]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.917295]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.918072]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.918853]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.919700]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.920482]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.921248]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.922030]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.922757]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.923527]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.924374]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.925152]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.925934]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.926737]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.927553]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.928333]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.929153]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.929938]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.930686]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.931526]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.932321]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.933039]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.933800]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.934531]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.935248]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.936014]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.936743]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.937461]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.938225]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.938956]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.939672]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.940434]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.941165]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.941881]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.943015]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.943705]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.944396]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.945163]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.945896]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.946619]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.947386]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.948121]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.948841]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.949609]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.950343]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.951066]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.951832]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.952568]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.953295]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.954060]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.954809]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.955529]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.956290]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.957023]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.957739]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.958501]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.959232]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.959950]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.960710]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.961440]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.962156]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.962917]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.963647]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.964365]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.965128]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.965856]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.966574]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.967336]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.968066]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.968781]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.969543]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.970272]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.970990]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.971749]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.973000]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.973679]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.974404]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.975142]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.975857]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.976618]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.977347]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.978064]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.978823]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.979554]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.980270]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.981032]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.981759]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.982475]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.983235]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.983964]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.984681]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.985443]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.986173]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.986887]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.987650]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.988379]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.989097]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.989857]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.990586]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.991302]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    0.992064]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    0.999173]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    0.999893]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.000654]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.001382]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.002605]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.003526]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.004260]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.004978]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.005736]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.006465]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.007182]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.007942]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.008669]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.009416]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.010231]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.010971]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.011690]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.012450]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.013179]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.013894]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.014657]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.015386]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.016103]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.016862]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.017591]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.018308]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.019070]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.019798]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.020514]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.021274]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.022005]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.022719]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.023480]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.024210]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.024925]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.025686]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.026416]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.027134]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.027894]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.028623]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.029344]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.030106]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.030833]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.031551]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.032834]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.033574]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.034254]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.034999]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.035772]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.036536]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.037340]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.038125]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.038876]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.039692]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.040451]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.041240]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.042056]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.042810]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.043586]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.044360]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.045104]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.045828]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.046628]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.047401]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.048162]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.048988]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.049738]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.050514]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.051331]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.052126]  [<ffffffffb2f72825>] pci_scan_bridge+0x535/0x6a0
[    1.052867]  [<ffffffffb2f71614>] ? pci_scan_single_device+0x74/0xf0
[    1.053695]  [<ffffffffb2f72a46>] pci_scan_child_bus+0xb6/0x190
[    1.054447]  [<ffffffffb31822a2>] pci_acpi_scan_root+0x322/0x680
[    1.055237]  [<ffffffffb2fbb6e9>] acpi_pci_root_add+0x39a/0x490
[    1.056014]  [<ffffffffb2fbd97a>] ? acpi_pnp_match+0x30/0xa6
[    1.056756]  [<ffffffffb2fb715b>] acpi_bus_attach+0xeb/0x1ef
[    1.057508]  [<ffffffffb2fb71d3>] acpi_bus_attach+0x163/0x1ef
[    1.058281]  [<ffffffffb2fb71d3>] acpi_bus_attach+0x163/0x1ef
[    1.059012]  [<ffffffffb39ab317>] ? acpi_sleep_proc_init+0x2a/0x2a
[    1.059760]  [<ffffffffb2fb72c9>] acpi_bus_scan+0x6a/0x90
[    1.060451]  [<ffffffffb39ab785>] acpi_scan_init+0x7f/0x1c2
[    1.061156]  [<ffffffffb39ab5ac>] acpi_init+0x295/0x2af
[    1.061834]  [<ffffffffb2c020e8>] do_one_initcall+0xb8/0x230
[    1.062996]  [<ffffffffb39631f5>] kernel_init_freeable+0x17a/0x219
[    1.063743]  [<ffffffffb39629d4>] ? initcall_blacklist+0xb0/0xb0
[    1.064483]  [<ffffffffb32b6a30>] ? rest_init+0x80/0x80
[    1.065163]  [<ffffffffb32b6a3e>] kernel_init+0xe/0xf0
[    1.065835]  [<ffffffffb32d8658>] ret_from_fork+0x58/0x90
[    1.066528]  [<ffffffffb32b6a30>] ? rest_init+0x80/0x80
[    1.067206] Code: 44 00 00 55 48 8b 47 08 48 89 e5 48 63 48 18 48 8b 87 40 09 00 00 48 8b 50 48 eb 0b 66 90 48 8b 50 68 48 85 d2 74 1b 48 8b 42 40 <48> 03 04 cd a0 e8 92 b3 48 01 30 48 8b 02 48 8b 40 40 48 85 c0 
[    1.072226] RIP  [<ffffffffb2ce168d>] cpuacct_charge+0x2d/0x50
[    1.072998]  RSP <ffff938f7fd83e40>
[    1.073548] CR2: fffffffd49d872f0
[    1.074087] ---[ end trace 57bdeb4fca46b444 ]---
[    1.074721] Kernel panic - not syncing: Fatal exception in interrupt


Expected results:
guest can boot up successfully

Additional info:
guest boot up successfully with 8 e1000 nics (with io-reserve=0)

[1]
#!/bin/sh
MACHINE=q35
SMP=4,cores=2,threads=2,sockets=1
MEM=2G
GUEST_IMG=/home/test/rhel75-seabios.qcow2
IMG_FORMAT=qcow2
size=32

CLI="/usr/libexec/qemu-kvm -enable-kvm -M $MACHINE -nodefaults -smp $SMP -m $MEM -name vm1 -drive file=$GUEST_IMG,if=none,id=guest-img,format=$IMG_FORMAT,werror=stop,rerror=stop -device ide-hd,drive=guest-img,bus=ide.0,unit=0,id=os-disk,bootindex=1 -spice port=5931,disable-ticketing -vga qxl -monitor stdio -qmp tcp:0:6666,server,nowait -boot menu=on,reboot-timeout=8,strict=on -chardev file,path=/home/seabios.log,id=seabios -device isa-debugcon,chardev=seabios,iobase=0x402 -serial unix:/tmp/console,server,nowait"
while [ ${i:=0} -lt ${1:-0} ]
do
        blkDiskID=$((i))
        CLI="$CLI -device pcie-root-port,bus=pcie.0,id=root.$i,slot=$i,io-reserve=0"
     n=$((50-$i))
     CLI="$CLI -device e1000,netdev=tap$i,mac=9a:6a:6b:6c:6d:$n,bus=root.$i -netdev tap,id=tap$i"
    i=$((i+1))
done

$CLI
Comment 1 Fedora Update System 2018-05-31 14:24:04 UTC 
seabios-1.11.1-1.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2018-80b606cb29
Comment 2 Fedora Update System 2018-06-01 13:16:05 UTC 
seabios-1.11.1-1.fc28 has been pushed to the Fedora 28 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-80b606cb29
Comment 3 Fedora Update System 2018-06-26 17:32:51 UTC 
seabios-1.11.1-1.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.