Hi,

I ran into the following with leap 15.6 on a power8 with vios:

[   26.069618] kernel BUG at ../drivers/pci/msi/msi.c:154!
[   26.069627] Oops: Exception in kernel mode, sig: 5 [#1]
[   26.069634] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries
[   26.069642] Modules linked in: bonding tls af_packet rfkill xt_state
xt_conntrack iptable_filter xt_MASQUERADE iptable_nat nf_nat nf_conntrack
nf_defrag_ipv6 nf_defrag_ipv4 xt_tcpudp iptable_mangle ext4 crc16 mbcache jbd2
ibmveth(X) crct10dif_vpmsum rtc_generic fuse configfs ip_tables x_tables xfs
libcrc32c sr_mod cdrom xhci_pci xhci_pci_renesas ibmvscsi(X) scsi_transport_srp
sd_mod xhci_hcd scsi_dh_emc scsi_dh_rdac scsi_dh_alua t10_pi
crc64_rocksoft_generic crc64_rocksoft sg crc64 usbcore scsi_mod vmx_crypto
gf128mul crc32c_vpmsum usb_common
[   26.069732] Supported: Yes, External
[   26.069738] CPU: 3 PID: 772 Comm: irqbalance Not tainted
6.4.0-150600.23.7-default #1 SLE15-SP6 add0c91aba136d1acbe3fcdb4fead2567d86023a
[   26.069750] Hardware name: IBM,8284-22A POWER8E (raw) 0x4b0201 0xf000004
of:IBM,FW860.51 (SV860_165) hv:phyp pSeries
[   26.069757] NIP:  c000000000996ae8 LR: c00000000010a478 CTR:
c00000000010a450
[   26.069765] REGS: c000000036a2b490 TRAP: 0700   Not tainted 
(6.4.0-150600.23.7-default)
[   26.069773] MSR:  8000000000021033 <SF,ME,IR,DR,RI,LE>  CR: 88004828  XER:
20000000
[   26.069790] CFAR: c00000000010a474 IRQMASK: 1
               GPR00: c00000000010a478 c000000036a2b730 c000000001987d00
c000000028484bc0
               GPR04: c000000036a2b7e0 0000000000000000 0000000020000000
c0080000204a0d90
               GPR08: c000000002a01888 0000000000000001 c000000003825e40
0000000000001003
               GPR12: c00000000010a450 c00000001ecacb00 0000000000000000
0000000000000000
               GPR16: 0000000000000000 0000000000000000 0000000000000000
0000000000000000
               GPR20: 0000000000000000 0000000000000000 0000000000000000
0000000000000000
               GPR24: c0000000029a61e8 c0000000029a68d0 c00000002f13b000
c00000000292bf88
               GPR28: c000000036a2b928 c000000036a2b7e0 c000000028484bc0
c000000028e520d0
[   26.069880] NIP [c000000000996ae8] __pci_read_msi_msg+0x48/0x290
[   26.069892] LR [c00000000010a478] pseries_msi_compose_msg+0x28/0x40
[   26.069902] Call Trace:
[   26.069907] [c000000036a2b780] [c00000002f13b118] 0xc00000002f13b118
[   26.069917] [c000000036a2b7a0] [c000000000219d04]
irq_chip_compose_msi_msg+0x54/0x80
[   26.069928] [c000000036a2b7c0] [c000000000221584]
msi_domain_set_affinity+0x84/0x100
[   26.069940] [c000000036a2b810] [c00000000021324c]
irq_do_set_affinity+0x1bc/0x290
[   26.069951] [c000000036a2b870] [c0000000002134a4]
irq_set_affinity_locked+0x184/0x250
[   26.069962] [c000000036a2b8b0] [c0000000002135dc]
__irq_set_affinity+0x6c/0xc0
[   26.069973] [c000000036a2b900] [c00000000021f33c]
write_irq_affinity.isra.9+0x16c/0x1b0
[   26.069984] [c000000036a2ba60] [c00000000067ef88] proc_reg_write+0x108/0x1b0
[   26.069996] [c000000036a2ba90] [c0000000005a4c10] vfs_write+0x100/0x440
[   26.070008] [c000000036a2bb50] [c0000000005a517c] ksys_write+0xdc/0x130
[   26.070019] [c000000036a2bba0] [c000000000034bb8]
system_call_exception+0x158/0x320
[   26.070030] [c000000036a2be50] [c00000000000d6a0]
system_call_common+0x160/0x2c4
[   26.070041] --- interrupt: c00 at 0x7fffaca227e0
[   26.070048] NIP:  00007fffaca227e0 LR: 00007fffaca227b8 CTR:
0000000000000000
[   26.070054] REGS: c000000036a2be80 TRAP: 0c00   Not tainted 
(6.4.0-150600.23.7-default)
[   26.070062] MSR:  800000000280f033 <SF,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE>  CR:
28004422  XER: 00000000
[   26.070085] IRQMASK: 0
               GPR00: 0000000000000004 00007ffff9c291e0 00007fffacb36d00
0000000000000006
               GPR04: 0000010008000500 0000000000000008 0000000000000030
00007fffacf4c400
               GPR08: 00007fffacf44d48 0000000000000000 0000000000000000
0000000000000000
               GPR12: 0000000000000000 00007fffacf4c400 0000000000000000
0000000000000000
               GPR16: 0000000000000000 0000000000000000 0000000000000000
0000010008009010
               GPR20: 00007ffff9c2ac08 00007ffff9c2ac10 0000004100000000
0000000000000000
               GPR24: 0000000000000000 0000000000000019 000000011d8bec58
0000010008000500
               GPR28: 0000000000000008 0000010008000500 0000000000000000
0000000000000006
[   26.070171] NIP [00007fffaca227e0] 0x7fffaca227e0
[   26.070177] LR [00007fffaca227b8] 0x7fffaca227b8
[   26.070183] --- interrupt: c00
[   26.070188] Code: fbe1fff8 7c7e1b78 f821ffb1 7c9d2378 ebe30008 e92d0c78
f9210028 39200000 813fffd0 7d290034 5529d97e 69290001 <0b090000> a123004c
712a0001 4182016c
[   26.070219] ---[ end trace 0000000000000000 ]---

If you need any more info, just let me know.