[powerpc/powervm]Oops: Kernel access of bad area, sig: 11 [#1] while running stress-ng

[vrbagal1]

Hi,

Observing kernel oops on Power9(ZZ) box, running on PowerVM, while 
running stress-ng.


Kernel: 4.18.0-rc4
Machine: Power9 ZZ (PowerVM)
Test: Stress-ng

Attached is .config file

Traces:

  [12251.245209] Oops: Kernel access of bad area, sig: 11 [#1]
  [12251.245216] LE SMP NR_CPUS=2048 NUMA pSeries
  [12251.245249] Dumping ftrace buffer:
  [12251.245307]    (ftrace buffer empty)
  [12251.245317] Modules linked in: serpent_generic(E) twofish_generic(E) 
twofish_common(E) lrw(E) tgr192(E) wp512(E) vfio_iommu_spapr_tce(E) 
vfio_spapr_eeh(E) vfio(E) uhid(E) rmd320(E) hci_vhci(E) bluetooth(E) 
ecdh_generic(E) rfkill(E) uinput(E) rmd256(E) cuse(E) ppp_generic(E) 
slhc(E) snd_seq(E) snd_seq_device(E) vhost_net(E) snd_timer(E) 
vhost_vsock(E) vmw_vsock_virtio_transport_common(E) snd(E) tap(E) 
soundcore(E) tun(E) rmd160(E) vsock(E) rmd128(E) vhost(E) dccp_ipv4(E) 
dccp(E) md4(E) unix_diag(E) kvm_pr(E) sha512_generic(E) kvm(E) 
binfmt_misc(E) fuse(E) vfat(E) fat(E) btrfs(E) xor(E) zstd_decompress(E) 
zstd_compress(E) xxhash(E) raid6_pq(E) ext4(E) mbcache(E) jbd2(E) 
fscrypto(E) loop(E) ip6t_rpfilter(E) ipt_REJECT(E) nf_reject_ipv4(E) 
ip6t_REJECT(E) nf_reject_ipv6(E) xt_conntrack(E) ip_set(E) nfnetlink(E)
  [12251.245457]  ebtable_nat(E) ebtable_broute(E) bridge(E) stp(E) 
llc(E) ip6table_nat(E) nf_conntrack_ipv6(E) nf_defrag_ipv6(E) 
nf_nat_ipv6(E) ip6table_mangle(E) ip6table_security(E) ip6table_raw(E) 
iptable_nat(E) nf_conntrack_ipv4(E) nf_defrag_ipv4(E) nf_nat_ipv4(E) 
nf_nat(E) nf_conntrack(E) iptable_mangle(E) iptable_security(E) 
iptable_raw(E) ebtable_filter(E) ebtables(E) ip6table_filter(E) 
ip6_tables(E) iptable_filter(E) xts(E) vmx_crypto(E) sg(E) 
pseries_rng(E) ip_tables(E) xfs(E) libcrc32c(E) sd_mod(E) ibmvscsi(E) 
ibmveth(E) scsi_transport_srp(E) lpfc(E) mlx5_core(E) nvmet_fc(E) 
nvmet(E) nvme_fc(E) nvme_fabrics(E) nvme_core(E) scsi_transport_fc(E) 
mlxfw(E) devlink(E) dm_mirror(E) dm_region_hash(E) dm_log(E) dm_mod(E) 
[last unloaded: torture]
  [12251.245571] CPU: 47 PID: 44789 Comm: stress-ng-chdir Tainted: G      
       E     4.18.0-rc4-autotest-autotest #1
  [12251.245583] NIP:  c000000000319e2c LR: c00000000031eb84 CTR: 
c00000000031e860
  [12251.245593] REGS: c000000ef3e5b780 TRAP: 0380   Tainted: G           
  E      (4.18.0-rc4-autotest-autotest)
  [12251.245601] MSR:  800000010280b033 
<SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE,TM[E]>  CR: 44002442  XER: 00000000
  [12251.245625] CFAR: c00000000031eb80 IRQMASK: 0
  [12251.245625] GPR00: c00000000031ead8 c000000ef3e5ba00 
c000000001150200 c000000ff801fa20
  [12251.245625] GPR04: 6000000060000000 0000000000005b89 
0000000000005b88 0000000000000000
  [12251.245625] GPR08: 0000000ffe750000 0000000000000000 
0000000000000000 d00000000ec1d458
  [12251.245625] GPR12: c00000000031e860 c00000001ec10600 
0000000000000000 0000000000000000
  [12251.245625] GPR16: 00007fffb24c4318 0000000000000000 
0000000000000002 0000000000003e30
  [12251.245625] GPR20: 0000000000000002 c000000ef3e5bc00 
0000000000000001 000000000000002d
  [12251.245625] GPR24: 6000000060000000 0000000000000001 
d00000000ebdf63c c000000ff801fa00
  [12251.245625] GPR28: 0000000000000008 0000000000600240 
c000000000000000 c000000ff801fa00
  [12251.245727] NIP [c000000000319e2c] 
prefetch_freepointer.isra.31+0xc/0x20
  [12251.245737] LR [c00000000031eb84] __kmalloc+0x324/0x360
  [12251.245743] Call Trace:
  [12251.245751] [c000000ef3e5ba00] [c00000000031ead8] 
__kmalloc+0x278/0x360 (unreliable)
  [12251.245792] [c000000ef3e5ba70] [d00000000ebdf63c] 
kmem_alloc+0xbc/0x170 [xfs]
  [12251.245824] [c000000ef3e5bb00] [d00000000eb88348] 
xfs_idata_realloc+0x1e8/0x280 [xfs]
  [12251.245856] [c000000ef3e5bb50] [d00000000eb7c508] 
xfs_dir2_sf_create+0xa8/0x260 [xfs]
  [12251.245887] [c000000ef3e5bba0] [d00000000eb6c034] 
xfs_dir_init+0xb4/0x120 [xfs]
  [12251.245923] [c000000ef3e5bbe0] [d00000000ebca310] 
xfs_create+0x720/0x7a0 [xfs]
  [12251.245955] [c000000ef3e5bce0] [d00000000ebc6148] 
xfs_generic_create+0x2d8/0x440 [xfs]
  [12251.245967] [c000000ef3e5bd70] [c00000000036e138] 
vfs_mkdir+0x188/0x270
  [12251.245977] [c000000ef3e5bdc0] [c000000000374a7c] 
do_mkdirat+0x13c/0x150
  [12251.245986] [c000000ef3e5be30] [c00000000000b288] 
system_call+0x5c/0x70
  [12251.245994] Instruction dump:
  [12251.246000] 7fe3fb78 486869a9 60000000 38210030 e8010010 ebe1fff8 
7c0803a6 4e800020
  [12251.246017] 60420000 2c240000 4d820020 81230000 <7d24482a> 2fa90000 
4dde0020 7c004a2c
  [12251.246038] ---[ end trace 1e6b2851c03cbaa4 ]---
  [12251.249740]
  [12252.249787] Kernel panic - not syncing: Fatal exception
  [12252.254069] Dumping ftrace buffer:
  [12252.254119]    (ftrace buffer empty)

Regards,
Venkat.
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