Subject: Today's mainline failed to boot on Power 6 with WARNING: CPU: 8 PID: 0 at kernel/sched/sched.h

From: Abdul Haleem <[email-masked]>
Date: Mon, 13 Mar 2017 11:43:54 +0530

Hi,

4.11.0-rc1 failed to boot on Power 6 LPAR with the below warnings.

Machine Type : Power 6 LPAR
Kernel : 4.11.0-rc1
Config : p6-BE-config file attached

rq->clock_update_flags < RQCF_ACT_SKIP
------------[ cut here ]------------
WARNING: CPU: 8 PID: 0 at kernel/sched/sched.h:833 .update_blocked_averages+0xe78/0xfb0
Modules linked in: sr_mod(E) sd_mod(E) cdrom(E) dm_mirror(E) dm_region_hash(E) dm_log(E) dm_mod(E)
CPU: 8 PID: 0 Comm: swapper/8 Tainted: G            E   4.11.0-rc1-autotest #1
task: c0000001c2980080 task.stack: c0000001c2990000
NIP: c000000000108478 LR: c000000000108474 CTR: 0000000000000000
REGS: c0000001c2993180 TRAP: 0700   Tainted: G            E    (4.11.0-rc1-autotest)
MSR: 8000000000029032 <SF,EE,ME,IR,DR,RI>
  CR: 24282022  XER: 20000000 
CFAR: c0000000008341c4 SOFTE: 0 
GPR00: c000000000108474 c0000001c2993400 c000000001025600 0000000000000026 
GPR04: 0000000000000000 0000000000000006 c0000000010c5600 c0000000010c5600 
GPR08: 0000000000000000 c000000000beebb0 00000000d2420000 c0000000008741c0 
GPR12: 0000000024282024 c00000000edc1800 0000000000000000 0000000000000001 
GPR16: c0000000d3026ed0 0000000000000000 000000000000ba7e 000000000000ba7e 
GPR20: ffffffffafb50401 0000000000000000 c000000000c06600 c000000000c06600 
GPR24: afb504000afb5041 c0000000d3026600 0000000000000040 0000000000000000 
GPR28: 0000000000000000 c0000000fc85b200 c0000000fcb16d40 c0000000fcb16c00 
NIP [c000000000108478] .update_blocked_averages+0xe78/0xfb0
LR [c000000000108474] .update_blocked_averages+0xe74/0xfb0
Call Trace:
[c0000001c2993400] [c000000000108474] .update_blocked_averages+0xe74/0xfb0 (unreliable)
[c0000001c2993520] [c000000000110c14] .rebalance_domains+0x74/0x330
[c0000001c2993610] [c0000000000c8d00] .__do_softirq+0x180/0x3f0
[c0000001c2993720] [c0000000000c9358] .irq_exit+0x108/0x120
[c0000001c2993790] [c00000000001f17c] .timer_interrupt+0x9c/0xd0
[c0000001c2993810] [c000000000009308] decrementer_common+0x158/0x160
--- interrupt: 901 at plpar_hcall_norets_trace+0x58/0x8c
    LR = plpar_hcall_norets_trace+0x34/0x8c
[c0000001c2993b70] [c0000000006a5cd4] .check_and_cede_processor+0x24/0x40
[c0000001c2993be0] [c0000000006a5f34] .dedicated_cede_loop+0x64/0x170
[c0000001c2993c70] [c0000000006a3954] .cpuidle_enter_state+0xc4/0x3b0
[c0000001c2993d20] [c00000000011b320] .call_cpuidle+0x40/0x70
[c0000001c2993d90] [c00000000011b6e0] .do_idle+0x2a0/0x310
[c0000001c2993e60] [c00000000011b97c] .cpu_startup_entry+0x2c/0x30
[c0000001c2993ee0] [c00000000003e6a8] .start_secondary+0x358/0x3a0
[c0000001c2993f90] [c00000000000b06c] start_secondary_prolog+0x10/0x14
Instruction dump:
60000000 60000000 3d42fff0 892addef 2f890000 40fef2a0 3c62ffa4 39000001 
3863de68 990addef 4872bd25 60000000 <0fe00000> 4bfff280 5540d97e 794a06e0 
---[ end trace f610c7e162cdd3b8 ]---
Unable to handle kernel paging request for data at address 0x2c23000041820054
Faulting instruction address: 0xc0000000001076e0
Oops: Kernel access of bad area, sig: 11 [#1]

-- 
Regard's

Abdul Haleem
IBM Linux Technology Centre