Fwd: [powerpc/Baremetal]Kernel OOPS while executing memory hotplug on Power8 baremetal

[vrbagal1]

+scsi mailing list, and edited the subject line.

Pasting the traces here.

[ 2484.634761] Unable to handle kernel paging request for instruction 
fetch
[ 2484.634849] Faulting instruction address: 0x00000000
[ 2484.634862] Oops: Kernel access of bad area, sig: 11 [#1]
[ 2484.634905] LE SMP NR_CPUS=2048 NUMA PowerNV
[ 2484.634991] Dumping ftrace buffer:
[ 2484.635116]    (ftrace buffer empty)
[ 2484.635158] Modules linked in: binfmt_misc ipt_MASQUERADE 
nf_nat_masquerade_ipv4 tun bridge stp llc xt_tcpudp ipt_REJECT 
nf_reject_ipv4 xt_conntrack nfnetlink iptable_nat nf_conntrack_ipv4 
nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle 
iptable_filter powernv_rng rng_core ipmi_powernv ipmi_devintf 
ipmi_msghandler vmx_crypto leds_powernv powernv_op_panel led_class 
kvm_hv nfsd kvm ip_tables x_tables autofs4
[ 2484.635528] CPU: 48 PID: 0 Comm: swapper/48 Not tainted 
4.17.0-autotest #1
[ 2484.635591] NIP:  0000000000000000 LR: c00000000014beb4 CTR: 
0000000000000000
[ 2484.635667] REGS: c000000ffff4f600 TRAP: 0400   Not tainted  
(4.17.0-autotest)
[ 2484.635741] MSR:  9000000040009033 <SF,HV,EE,ME,IR,DR,RI,LE>  CR: 
28028028  XER: 20000000
[ 2484.635835] CFAR: c000000000008934 SOFTE: 1
[ 2484.635835] GPR00: c00000000014c4ec c000000ffff4f880 c0000000010fb800 
c0000007eb6d1d10
[ 2484.635835] GPR04: 0000000000000003 0000000000000000 0000000000000000 
0000000000000000
[ 2484.635835] GPR08: c000000ffff4f910 0000000000000000 0000000000000000 
c000000f11557970
[ 2484.635835] GPR12: 0000000000000000 c000000ffffb1880 c000000f272dff90 
0000000000200042
[ 2484.635835] GPR16: 0000000100035566 c000000ffff4c000 0000000000000000 
0000000000000001
[ 2484.635835] GPR20: c000000000dd6c80 c000000001123b00 0000000000000005 
c000000ffff4f910
[ 2484.635835] GPR24: 0000000000000001 0000000000000000 0000000000000000 
0000000000000003
[ 2484.635835] GPR28: 0000000000000000 c0000007e03001b0 0000000000000000 
ffffffffffffffe8
[ 2484.636474] NIP [0000000000000000]           (null)
[ 2484.636530] LR [c00000000014beb4] __wake_up_common+0xe4/0x1e0
[ 2484.636593] Call Trace:
[ 2484.636620] [c000000ffff4f880] [c000000ffff4f8c0] 0xc000000ffff4f8c0 
(unreliable)
[ 2484.636698] [c000000ffff4f8f0] [c00000000014c4ec] 
__wake_up_common_lock+0xac/0x100
[ 2484.636776] [c000000ffff4f980] [c000000000243acc] 
mempool_free+0xcc/0xf0
[ 2484.636842] [c000000ffff4f9b0] [c00000000052c090] bio_free+0x50/0x90
[ 2484.636907] [c000000ffff4f9e0] [c000000000850dc0] 
dec_pending+0x130/0x310
[ 2484.636971] [c000000ffff4fa60] [c0000000008512fc] 
clone_endio+0xcc/0x180
[ 2484.637036] [c000000ffff4fae0] [c00000000052c2a4] 
bio_endio+0x164/0x280
[ 2484.637102] [c000000ffff4fb80] [c000000000538eb0] 
blk_update_request+0xf0/0x4a0
[ 2484.637179] [c000000ffff4fc20] [c0000000006ba600] 
scsi_end_request+0x50/0x270
[ 2484.637255] [c000000ffff4fc80] [c0000000006baa44] 
scsi_io_completion+0x224/0x6b0
[ 2484.637332] [c000000ffff4fd10] [c0000000006b09a8] 
scsi_finish_command+0x138/0x170
[ 2484.637408] [c000000ffff4fd50] [c0000000006b9b28] 
scsi_softirq_done+0x178/0x1d0
[ 2484.637485] [c000000ffff4fdd0] [c000000000543e88] 
blk_done_softirq+0xa8/0xd0
[ 2484.637562] [c000000ffff4fe10] [c000000000a1fdbc] 
__do_softirq+0x15c/0x3b4
[ 2484.637628] [c000000ffff4ff00] [c0000000000f7d98] irq_exit+0xf8/0x110
[ 2484.637693] [c000000ffff4ff20] [c000000000016e98] __do_irq+0x98/0x200
[ 2484.637759] [c000000ffff4ff90] [c000000000028bd4] 
call_do_irq+0x14/0x24
[ 2484.637823] [c000000f272dfa50] [c000000000017094] do_IRQ+0x94/0x110
[ 2484.637888] [c000000f272dfaa0] [c000000000008db8] 
hardware_interrupt_common+0x158/0x160
[ 2484.637967] --- interrupt: 501 at replay_interrupt_return+0x0/0x4
[ 2484.637967]     LR = arch_local_irq_restore+0x74/0x90
[ 2484.638068] [c000000f272dfd90] [c000000000871c88] 
menu_select+0xc8/0x7f0 (unreliable)
[ 2484.638145] [c000000f272dfdb0] [c00000000086fc88] 
cpuidle_enter_state+0x108/0x3c0
[ 2484.638222] [c000000f272dfe10] [c0000000001308e4] 
call_cpuidle+0x44/0x80
[ 2484.638286] [c000000f272dfe30] [c000000000130e78] do_idle+0x2f8/0x3a0
[ 2484.638350] [c000000f272dfec0] [c0000000001310f0] 
cpu_startup_entry+0x30/0x40
[ 2484.638427] [c000000f272dfef0] [c000000000043580] 
start_secondary+0x4d0/0x520
[ 2484.638504] [c000000f272dff90] [c00000000000b284] 
start_secondary_resume+0x10/0x14
[ 2484.638579] Instruction dump:
[ 2484.638618] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX 
XXXXXXXX XXXXXXXX
[ 2484.638697] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX 
XXXXXXXX XXXXXXXX
[ 2484.638778] ---[ end trace 9e63f5da6878e977 ]---
[ 2484.639008]
[ 2485.639101] Kernel panic - not syncing: Fatal exception in interrupt
[ 2485.639465] Dumping ftrace buffer:
[ 2485.639514]    (ftrace buffer empty)
[ 2485.639732] Rebooting in 10 seconds..


Cheers,
Venkat.
IBM Linux Technology Centre


-------- Original Message --------
Subject: [mainline] [powerpc/powervm]Kernel OOPS while executing memory 
hotplug on Power8 baremetal
Date: 2018-06-07 11:55
 From: vrbagal1 <vrbagal1 at linux.vnet.ibm.com>
To: linuxppc-dev <linuxppc-dev at lists.ozlabs.org>
Cc: sachinp <sachinp at linux.vnet.ibm.com>, mpe at ellerman.id.au

Greetings!!!

Observing Kernel oops and machine reboots while executing memory hotplug 
test case, on Power8 Baremetal machine.

I see this is introduced some where between rc6 and 4.17.

Machine: Power 8 Baremetal
Kernel Version: Linux version 4.17.0-autotest
gcc Version: gcc version 4.8.5 20150623 (Red Hat 4.8.5-28) (GCC))


Attached is the .config file and traces found.

Cheers.
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