System crashed while performing LPAR memory reconfiguration

Issue

• While performing an LPAR memory reconfiguration the host crashed with the following:

[19454848.744890] Offlined Pages 4096
[19454848.803812] Offlined Pages 4096
[19454848.808600] Offlined Pages 4096
[19454848.809205] Unable to handle kernel paging request for data at address 0x00008398
[19454848.809211] Faulting instruction address: 0xc000000000367710
[19454848.809217] Oops: Kernel access of bad area, sig: 11 [#1]
[19454848.809220] SMP NR_CPUS=2048 NUMA pSeries
[19454848.809227] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace sunrpc fscache rpadlpar_io rpaphp tcp_diag udp_diag inet_diag unix_diag af_packet_diag netlink_diag sg pseries_rng binfmt_misc ip_tables ext4 mbcache jbd2 dm_service_time sd_mod sr_mod crc_t10dif crct10dif_generic cdrom crct10dif_common ibmvfc ibmvscsi scsi_transport_fc scsi_transport_srp ibmveth scsi_tgt dm_multipath dm_mirror dm_region_hash dm_log dm_mod
[19454848.809280] CPU: 3 PID: 55842 Comm: kworker/u448:3 Kdump: loaded Tainted: G    B   W      ------------   3.10.0-1160.36.2.el7.ppc64le #1
[19454848.809290] Workqueue: pseries hotplug workque pseries_hp_work_fn
[19454848.809295] task: c000000fe6809a00 ti: c000000fe4cec000 task.ti: c000000fe4cec000
[19454848.809300] NIP: c000000000367710 LR: c00000000039506c CTR: 000000000000a6a4
[19454848.809304] REGS: c000000fe4cef740 TRAP: 0300   Tainted: G    B   W      ------------    (3.10.0-1160.36.2.el7.ppc64le)
[19454848.809309] MSR: 8000000100009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 280f8d84  XER: 20000000
[19454848.809322] CFAR: c0000000000093ec DAR: 0000000000008398 DSISR: 40000000 SOFTE: 1
GPR00: c00000000039506c c000000fe4cef9c0 c00000000148c000 0000000000000007
GPR04: 0000000000000800 c000000fe4cef880 ffffffff00000000 ffffffffffffffff
GPR08: c00000000183c000 c0000000016379d8 0000000000010000 0000000000000040
GPR12: 0000000000000000 c000000007ad1c80 c00000000013a5a8 c000000fe7cefb40
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20: 0000000000000000 00000000003fffff 0000000000000001 c000001fe8546000
GPR24: 0000000000000007 c0000000013a1bd0 c0000000013a1c08 0000001010000000
GPR28: 0000000010000000 c000000001861a80 0000000000000000 0000000000000007
[19454848.809384] NIP [c000000000367710] try_offline_node+0x40/0x210
[19454848.809390] LR [c00000000039506c] remove_memory+0x1bc/0x280
[19454848.809394] Call Trace:
[19454848.809399] [c000000fe4cef9c0] [c000000fe4cefa00] 0xc000000fe4cefa00 (unreliable)
[19454848.809405] [c000000fe4cefa00] [c00000000039506c] remove_memory+0x1bc/0x280
[19454848.809411] [c000000fe4cefab0] [c0000000000ba57c] dlpar_remove_lmb+0x1cc/0x230
[19454848.809417] [c000000fe4cefb00] [c0000000000bb1a0] dlpar_memory+0x760/0xe40
[19454848.809422] [c000000fe4cefbc0] [c0000000000b11e8] pseries_hp_work_fn+0x78/0x220
[19454848.809428] [c000000fe4cefc40] [c00000000012d71c] process_one_work+0x1dc/0x680
[19454848.809434] [c000000fe4cefce0] [c00000000012dd60] worker_thread+0x1a0/0x520
[19454848.809439] [c000000fe4cefd80] [c00000000013a694] kthread+0xf4/0x100
[19454848.809445] [c000000fe4cefe30] [c00000000000a62c] ret_from_kernel_thread+0x5c/0x70
[19454848.809449] Instruction dump:
[19454848.809453] 7c0802a6 fba1ffe8 fbc1fff0 fbe1fff8 f8010010 f821ffc1 786a1f24 7c7f1b78
[19454848.809462] 3d22001b 3929b9d8 7fc9502a 3d5e0001 <e92a8398> e8aa83a8 7ca92a14 7fa92840
[19454848.809476] ---[ end trace 1acaf4ccbaeeed95 ]---
[19454848.816836]
[19454848.816858] Sending IPI to other CPUs
[19454848.817950] IPI complete