On Wed, Aug 23, 2017 at 04:14:24AM +1000, Stephen Rothwell wrote:

Hi all,
=20
On Wed, 23 Aug 2017 04:11:17 +1000 Stephen Rothwell <sfr@canb.auug.org.au=
wrote:

quoted

This tree fails to boot on my qemu test.  2 boot logs attached.
=20
Paul, Nick, is this the same/similar to the other RCU/lockup bug you
are chasing.  This is the first time I have seen this failure.
=20
This qemu boot is in full emulation mode if I add --enable-kvm to the
qemu command, it does not fail to boot.  (the test just boots and then =

shuts down)

=20
Boot logs attached this time.

That does not look good!

Given that the hard lockup happened during timer lock acquisition, I
have to ask if you built with lockdep...

							Thanx, Paul

--=20
Cheers,
Stephen Rothwell

spawn qemu-system-ppc64 -M pseries -m 2G -vga none -nographic -kernel /ho=

me/sfr/next/powerpc_pseries_le_defconfig/vmlinux -initrd ./ppc64le-rootfs.c=
pio.gz

=20
=20
SLOF=1B[0m=1B[?25l ******************************************************=

****************

=1B[1mQEMU Starting
=1B[0m Build Date =3D Jan  3 2017 22:22:01
 FW Version =3D buildd@ release 20161019
 Press "s" to enter Open Firmware.
=20
=1B[0m=1B[?25hC0000C0100C0120C0140C0200C0201C0220C0240C0260C02E0C0300C032=

0C0340C0360C0370C0380C0371C0372C0373C0374C03F0C0400C0480C04C0C04D0C0500Popu=
lating /vdevice methods

Populating /vdevice/vty@71000000
Populating /vdevice/nvram@71000001
Populating /vdevice/l-lan@71000002
Populating /vdevice/v-scsi@71000003
       SCSI: Looking for devices
          8200000000000000 CD-ROM   : "QEMU     QEMU CD-ROM      2.5+"
C0580C05A0Populating /pci@800000020000000
C0600C0640C0690C06A0C06A8C06B0C06B8C06C0C06E0C0700C0800C0880No NVRAM comm=

on partition, re-initializing...

C0890C08A0C08A8C08B0Scanning USB=20
C08C0C08D0Using default console: /vdevice/vty@71000000
C08E0C08E8Detected RAM kernel at 400000 (1071618 bytes) C08FF    =20
  Welcome to Open Firmware
=20
  Copyright (c) 2004, 2011 IBM Corporation All rights reserved.
  This program and the accompanying materials are made available
  under the terms of the BSD License available at
  http://www.opensource.org/licenses/bsd-license.php
=20
Booting from memory...
OF stdout device is: /vdevice/vty@71000000
Preparing to boot Linux version 4.13.0-rc6 (sfr@colugo-sfr) (gcc version =

5.2.1 20151008 (GCC)) #2 SMP Tue Aug 22 18:19:21 AEST 2017

Detected machine type: 0000000000000101
command line:=20
Max number of cores passed to firmware: 2048 (NR_CPUS =3D 2048)
Calling ibm,client-architecture-support... done
memory layout at init:
  memory_limit : 0000000000000000 (16 MB aligned)
  alloc_bottom : 0000000001490000
  alloc_top    : 0000000030000000
  alloc_top_hi : 0000000080000000
  rmo_top      : 0000000030000000
  ram_top      : 0000000080000000
instantiating rtas at 0x000000002fff0000... done
prom_hold_cpus: skipped
copying OF device tree...
Building dt strings...
Building dt structure...
Device tree strings 0x00000000016a0000 -> 0x00000000016a09df
Device tree struct  0x00000000016b0000 -> 0x00000000016c0000
Quiescing Open Firmware ...
Booting Linux via __start() @ 0x0000000000400000 ...
Page sizes from device-tree:
base_shift=3D12: shift=3D12, sllp=3D0x0000, avpnm=3D0x00000000, tlbiel=3D=

1, penc=3D0

base_shift=3D12: shift=3D16, sllp=3D0x0000, avpnm=3D0x00000000, tlbiel=3D=

1, penc=3D7

base_shift=3D12: shift=3D24, sllp=3D0x0000, avpnm=3D0x00000000, tlbiel=3D=

1, penc=3D56

base_shift=3D16: shift=3D16, sllp=3D0x0110, avpnm=3D0x00000000, tlbiel=3D=

1, penc=3D1

base_shift=3D16: shift=3D24, sllp=3D0x0110, avpnm=3D0x00000000, tlbiel=3D=

1, penc=3D8

base_shift=3D24: shift=3D24, sllp=3D0x0100, avpnm=3D0x00000001, tlbiel=3D=

0, penc=3D0

base_shift=3D34: shift=3D34, sllp=3D0x0120, avpnm=3D0x000007ff, tlbiel=3D=

0, penc=3D3

Using 1TB segments
Initializing hash mmu with SLB
Linux version 4.13.0-rc6 (sfr@colugo-sfr) (gcc version 5.2.1 20151008 (GC=

C)) #2 SMP Tue Aug 22 18:19:21 AEST 2017

Found initrd at 0xc000000001490000:0xc00000000165d70b
Using pSeries machine description
bootconsole [udbg0] enabled
Partition configured for 1 cpus.
CPU maps initialized for 1 thread per core
 -> smp_release_cpus()
spinning_secondaries =3D 0
 <- smp_release_cpus()
-----------------------------------------------------
ppc64_pft_size    =3D 0x18
phys_mem_size     =3D 0x80000000
dcache_bsize      =3D 0x80
icache_bsize      =3D 0x80
cpu_features      =3D 0x077c7a6c18500249
  possible        =3D 0x5fffffff18500649
  always          =3D 0x0000000018100040
cpu_user_features =3D 0xdc0065c2 0xae000000
mmu_features      =3D 0x7c006001
firmware_features =3D 0x00000001405a445f
htab_hash_mask    =3D 0x1ffff
-----------------------------------------------------
numa:   NODE_DATA [mem 0x7ffe2300-0x7ffebfff]
PCI host bridge /pci@800000020000000  ranges:
  IO 0x0000200000000000..0x000020000000ffff -> 0x0000000000000000
 MEM 0x0000200080000000..0x00002000ffffffff -> 0x0000000080000000=20
 MEM 0x0000210000000000..0x000021ffffffffff -> 0x0000210000000000=20
PPC64 nvram contains 65536 bytes
Zone ranges:
  DMA      [mem 0x0000000000000000-0x000000007fffffff]
  DMA32    empty
  Normal   empty
Movable zone start for each node
Early memory node ranges
  node   0: [mem 0x0000000000000000-0x000000007fffffff]
Initmem setup node 0 [mem 0x0000000000000000-0x000000007fffffff]
percpu: Embedded 3 pages/cpu @c00000007fe00000 s158616 r0 d37992 u1048576
Built 1 zonelists, mobility grouping on.  Total pages: 32736
Policy zone: DMA
Kernel command line:=20
PID hash table entries: 4096 (order: -1, 32768 bytes)
Memory: 2060800K/2097152K available (10112K kernel code, 1600K rwdata, 27=

52K rodata, 896K init, 1413K bss, 36352K reserved, 0K cma-reserved)

SLUB: HWalign=3D128, Order=3D0-3, MinObjects=3D0, CPUs=3D1, Nodes=3D1
Hierarchical RCU implementation.
	RCU event tracing is enabled.
	RCU restricting CPUs from NR_CPUS=3D2048 to nr_cpu_ids=3D1.
RCU: Adjusting geometry for rcu_fanout_leaf=3D16, nr_cpu_ids=3D1
NR_IRQS: 512, nr_irqs: 512, preallocated irqs: 16
clocksource: timebase: mask: 0xffffffffffffffff max_cycles: 0x761537d007,=

 max_idle_ns: 440795202126 ns

clocksource: timebase mult[1f40000] shift[24] registered
Console: colour dummy device 80x25
console [hvc0] enabled
console [hvc0] enabled
bootconsole [udbg0] disabled
bootconsole [udbg0] disabled
pid_max: default: 32768 minimum: 301
Dentry cache hash table entries: 262144 (order: 5, 2097152 bytes)
Inode-cache hash table entries: 131072 (order: 4, 1048576 bytes)
Mount-cache hash table entries: 8192 (order: 0, 65536 bytes)
Mountpoint-cache hash table entries: 8192 (order: 0, 65536 bytes)
EEH: pSeries platform initialized
POWER8 performance monitor hardware support registered
Hierarchical SRCU implementation.
smp: Bringing up secondary CPUs ...
smp: Brought up 1 node, 1 CPU
numa: Node 0 CPUs: 0
devtmpfs: initialized
random: get_random_u32 called from bucket_table_alloc+0x144/0x380 with cr=

ng_init=3D0

clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_n=

s: 19112604462750000 ns

futex hash table entries: 256 (order: -1, 32768 bytes)
NET: Registered protocol family 16
EEH: No capable adapters found
cpuidle: using governor menu
kworker/u2:1 (27) used greatest stack depth: 13872 bytes left
kworker/u2:1 (28) used greatest stack depth: 13584 bytes left
random: fast init done
kworker/u2:0 (17) used greatest stack depth: 12352 bytes left
pstore: using zlib compression
pstore: Registered nvram as persistent store backend
Linux ppc64le
#2 SMP Tue Aug 2PCI: Probing PCI hardware
PCI host bridge to bus 0000:00
pci_bus 0000:00: root bus resource [io  0x10000-0x1ffff] (bus address [0x=

0000-0xffff])

pci_bus 0000:00: root bus resource [mem 0x200080000000-0x2000ffffffff] (b=

us address [0x80000000-0xffffffff])

pci_bus 0000:00: root bus resource [mem 0x210000000000-0x21ffffffffff]
pci_bus 0000:00: root bus resource [bus 00-ff]
IOMMU table initialized, virtual merging enabled
HugeTLB registered 16.0 MiB page size, pre-allocated 0 pages
HugeTLB registered 16.0 GiB page size, pre-allocated 0 pages
vgaarb: loaded
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
pps_core: LinuxPPS API ver. 1 registered
pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <gio=

metti@linux.it>

PTP clock support registered
clocksource: Switched to clocksource timebase
NET: Registered protocol family 2
TCP established hash table entries: 16384 (order: 1, 131072 bytes)
TCP bind hash table entries: 16384 (order: 2, 262144 bytes)
TCP: Hash tables configured (established 16384 bind 16384)
UDP hash table entries: 2048 (order: 0, 65536 bytes)
UDP-Lite hash table entries: 2048 (order: 0, 65536 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
Trying to unpack rootfs image as initramfs...
Freeing initrd memory: 1792K
audit: initializing netlink subsys (disabled)
audit: type=3D2000 audit(1503390342.630:1): state=3Dinitialized audit_ena=

bled=3D0 res=3D1

workingset: timestamp_bits=3D38 max_order=3D15 bucket_order=3D0
NFS: Registering the id_resolver key type
Key type id_resolver registered
Key type id_legacy registered
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250)
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
io scheduler mq-deadline registered
io scheduler kyber registered
Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
brd: module loaded
loop: module loaded
ipr: IBM Power RAID SCSI Device Driver version: 2.6.4 (March 14, 2017)
ibmvscsi 71000003: SRP_VERSION: 16.a
ibmvscsi 71000003: Maximum ID: 64 Maximum LUN: 32 Maximum Channel: 3
scsi host0: IBM POWER Virtual SCSI Adapter 1.5.9
ibmvscsi 71000003: partner initialization complete
ibmvscsi 71000003: host srp version: 16.a, host partition qemu (0), OS 2,=

 max io 2097152

ibmvscsi 71000003: sent SRP login
ibmvscsi 71000003: SRP_LOGIN succeeded
scsi 0:0:2:0: CD-ROM            QEMU     QEMU CD-ROM      2.5+ PQ: 0 ANSI=

: 5

sr 0:0:2:0: [sr0] scsi3-mmc drive: 16x/50x cd/rw xa/form2 cdda tray
cdrom: Uniform CD-ROM driver Revision: 3.20
sr 0:0:2:0: Attached scsi generic sg0 type 5
libphy: Fixed MDIO Bus: probed
e100: Intel(R) PRO/100 Network Driver, 3.5.24-k2-NAPI
e100: Copyright(c) 1999-2006 Intel Corporation
e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI
e1000: Copyright (c) 1999-2006 Intel Corporation.
e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
ehci-pci: EHCI PCI platform driver
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
ohci-pci: OHCI PCI platform driver
rtc-generic rtc-generic: rtc core: registered rtc-generic as rtc0
IR NEC protocol handler initialized
IR RC5(x/sz) protocol handler initialized
IR RC6 protocol handler initialized
IR JVC protocol handler initialized
IR Sony protocol handler initialized
IR SANYO protocol handler initialized
IR Sharp protocol handler initialized
IR MCE Keyboard/mouse protocol handler initialized
IR XMP protocol handler initialized
device-mapper: uevent: version 1.0.3
device-mapper: ioctl: 4.36.0-ioctl (2017-06-09) initialised: dm-devel@red=

hat.com

usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
ipip: IPv4 and MPLS over IPv4 tunneling driver
NET: Registered protocol family 17
Key type dns_resolver registered
registered taskstats version 1
console [netcon0] enabled
netconsole: network logging started
rtc-generic rtc-generic: setting system clock to 2017-08-22 08:25:43 UTC =

(1503390343)

Freeing unused kernel memory: 896K
This architecture does not have kernel memory protection.
INFO: rcu_sched self-detected stall on CPU
	0-...: (2100 ticks this GP) idle=3D026/140000000000001/0 softirq=3D1069/=

1069 fqs=3D0=20

	 (t=3D2100 jiffies g=3D-66 c=3D-67 q=3D17)
rcu_sched kthread starved for 2100 jiffies! g18446744073709551550 c184467=

44073709551549 f0x0 RCU_GP_WAIT_FQS(3) ->state=3D0x0 ->cpu=3D0

rcu_sched       R  running task    14192     8      2 0x00000800
Call Trace:
[c00000007e65f8d0] [c00000007e65f900] 0xc00000007e65f900 (unreliable)
[c00000007e65faa0] [c00000000001b678] __switch_to+0x298/0x460
[c00000007e65fb00] [c0000000009d5524] __schedule+0x3e4/0xab0
[c00000007e65fbe0] [c0000000009d5c30] schedule+0x40/0xb0
[c00000007e65fc10] [c0000000009da4bc] schedule_timeout+0x1fc/0x440
[c00000007e65fcf0] [c0000000001754ac] rcu_gp_kthread+0x60c/0x1090
[c00000007e65fdc0] [c000000000112a10] kthread+0x160/0x1a0
[c00000007e65fe30] [c00000000000bae0] ret_from_kernel_thread+0x5c/0x7c
NMI backtrace for cpu 0
CPU: 0 PID: 7 Comm: ksoftirqd/0 Not tainted 4.13.0-rc6 #2
Call Trace:
[c00000007e65b0e0] [c0000000009bbfa0] dump_stack+0xb0/0xf0 (unreliable)
[c00000007e65b120] [c0000000009c4cb8] nmi_cpu_backtrace+0x208/0x210
[c00000007e65b1b0] [c0000000009c4ea0] nmi_trigger_cpumask_backtrace+0x1e0=

/0x220

[c00000007e65b240] [c00000000002d100] arch_trigger_cpumask_backtrace+0x20=

/0x40

0=20

GPR04: 0000000000000001 000000007f0b0000 000000055f52d5ae 000000000000000=

0=20

GPR08: c00000000fd40000 0000000000400000 0000000000400000 000000000000000=

0=20

GPR12: 0000000028000222 c00000000fd40000=20
NIP [c00000000000ad4c] .L1=0242+0x0/0x4
LR [c000000000015ae4] arch_local_irq_restore+0x74/0x90
Call Trace:
[c00000007e65b940] [98a11310c2925282] 0x98a11310c2925282 (unreliable)
[c00000007e65b960] [c00000000002c688] wd_smp_clear_cpu_pending+0x168/0x380
[c00000007e65b9f0] [c00000000002d188] watchdog_timer_interrupt+0x68/0x370
[c00000007e65ba90] [c00000000002d528] wd_timer_fn+0x38/0x60
[c00000007e65bac0] [c00000000017de28] call_timer_fn+0x58/0x1c0
[c00000007e65bb50] [c00000000017e100] expire_timers+0x140/0x1e0
[c00000007e65bbc0] [c00000000017e268] run_timer_softirq+0xc8/0x230
[c00000007e65bc50] [c0000000009dc7f0] __do_softirq+0x170/0x3e4
[c00000007e65bd40] [c0000000000eef9c] run_ksoftirqd+0x3c/0xb0
[c00000007e65bd60] [c000000000118500] smpboot_thread_fn+0x290/0x2a0
[c00000007e65bdc0] [c000000000112a10] kthread+0x160/0x1a0
[c00000007e65be30] [c00000000000bae0] ret_from_kernel_thread+0x5c/0x7c
Instruction dump:
7d200026 618c8000 2c030900 4182e348 2c030500 4182dda0 2c030a00 4182ffc0=

=20

60000000 60000000 60000000 60000000 <4e800020> 7c781b78 48000331 48000349=

=20

timeout waiting for login
=20
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 BAD BAD BAD BAD BAD BAD BAD BAD BAD BAD=20
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

spawn qemu-system-ppc64 -M pseries -m 2G -vga none -nographic -kernel /ho=

me/sfr/next/powerpc_pseries_le_defconfig/vmlinux -initrd ./ppc64le-rootfs.c=
pio.gz

=20
=20
SLOF=1B[0m=1B[?25l ******************************************************=

****************

=1B[1mQEMU Starting
=1B[0m Build Date =3D Jan  3 2017 22:22:01
 FW Version =3D buildd@ release 20161019
 Press "s" to enter Open Firmware.
=20
=1B[0m=1B[?25hC0000C0100C0120C0140C0200C0201C0220C0240C0260C02E0C0300C032=

0C0340C0360C0370C0380C0371C0372C0373C0374C03F0C0400C0480C04C0C04D0C0500Popu=
lating /vdevice methods

Populating /vdevice/vty@71000000
Populating /vdevice/nvram@71000001
Populating /vdevice/l-lan@71000002
Populating /vdevice/v-scsi@71000003
       SCSI: Looking for devices
          8200000000000000 CD-ROM   : "QEMU     QEMU CD-ROM      2.5+"
C0580C05A0Populating /pci@800000020000000
C0600C0640C0690C06A0C06A8C06B0C06B8C06C0C06E0C0700C0800C0880No NVRAM comm=

on partition, re-initializing...

C0890C08A0C08A8C08B0Scanning USB=20
C08C0C08D0Using default console: /vdevice/vty@71000000
C08E0C08E8Detected RAM kernel at 400000 (1071618 bytes) C08FF    =20
  Welcome to Open Firmware
=20
  Copyright (c) 2004, 2011 IBM Corporation All rights reserved.
  This program and the accompanying materials are made available
  under the terms of the BSD License available at
  http://www.opensource.org/licenses/bsd-license.php
=20
Booting from memory...
OF stdout device is: /vdevice/vty@71000000
Preparing to boot Linux version 4.13.0-rc6 (sfr@colugo-sfr) (gcc version =

5.2.1 20151008 (GCC)) #2 SMP Tue Aug 22 18:19:21 AEST 2017

Detected machine type: 0000000000000101
command line:=20
Max number of cores passed to firmware: 2048 (NR_CPUS =3D 2048)
Calling ibm,client-architecture-support... done
memory layout at init:
  memory_limit : 0000000000000000 (16 MB aligned)
  alloc_bottom : 0000000001490000
  alloc_top    : 0000000030000000
  alloc_top_hi : 0000000080000000
  rmo_top      : 0000000030000000
  ram_top      : 0000000080000000
instantiating rtas at 0x000000002fff0000... done
prom_hold_cpus: skipped
copying OF device tree...
Building dt strings...
Building dt structure...
Device tree strings 0x00000000016a0000 -> 0x00000000016a09df
Device tree struct  0x00000000016b0000 -> 0x00000000016c0000
Quiescing Open Firmware ...
Booting Linux via __start() @ 0x0000000000400000 ...
Page sizes from device-tree:
base_shift=3D12: shift=3D12, sllp=3D0x0000, avpnm=3D0x00000000, tlbiel=3D=

1, penc=3D0

base_shift=3D12: shift=3D16, sllp=3D0x0000, avpnm=3D0x00000000, tlbiel=3D=

1, penc=3D7

base_shift=3D12: shift=3D24, sllp=3D0x0000, avpnm=3D0x00000000, tlbiel=3D=

1, penc=3D56

base_shift=3D16: shift=3D16, sllp=3D0x0110, avpnm=3D0x00000000, tlbiel=3D=

1, penc=3D1

base_shift=3D16: shift=3D24, sllp=3D0x0110, avpnm=3D0x00000000, tlbiel=3D=

1, penc=3D8

base_shift=3D24: shift=3D24, sllp=3D0x0100, avpnm=3D0x00000001, tlbiel=3D=

0, penc=3D0

base_shift=3D34: shift=3D34, sllp=3D0x0120, avpnm=3D0x000007ff, tlbiel=3D=

0, penc=3D3

Using 1TB segments
Initializing hash mmu with SLB
Linux version 4.13.0-rc6 (sfr@colugo-sfr) (gcc version 5.2.1 20151008 (GC=

C)) #2 SMP Tue Aug 22 18:19:21 AEST 2017

Found initrd at 0xc000000001490000:0xc00000000165d70b
Using pSeries machine description
bootconsole [udbg0] enabled
Partition configured for 1 cpus.
CPU maps initialized for 1 thread per core
 -> smp_release_cpus()
spinning_secondaries =3D 0
 <- smp_release_cpus()
-----------------------------------------------------
ppc64_pft_size    =3D 0x18
phys_mem_size     =3D 0x80000000
dcache_bsize      =3D 0x80
icache_bsize      =3D 0x80
cpu_features      =3D 0x077c7a6c18500249
  possible        =3D 0x5fffffff18500649
  always          =3D 0x0000000018100040
cpu_user_features =3D 0xdc0065c2 0xae000000
mmu_features      =3D 0x7c006001
firmware_features =3D 0x00000001405a445f
htab_hash_mask    =3D 0x1ffff
-----------------------------------------------------
numa:   NODE_DATA [mem 0x7ffe2300-0x7ffebfff]
PCI host bridge /pci@800000020000000  ranges:
  IO 0x0000200000000000..0x000020000000ffff -> 0x0000000000000000
 MEM 0x0000200080000000..0x00002000ffffffff -> 0x0000000080000000=20
 MEM 0x0000210000000000..0x000021ffffffffff -> 0x0000210000000000=20
PPC64 nvram contains 65536 bytes
Zone ranges:
  DMA      [mem 0x0000000000000000-0x000000007fffffff]
  DMA32    empty
  Normal   empty
Movable zone start for each node
Early memory node ranges
  node   0: [mem 0x0000000000000000-0x000000007fffffff]
Initmem setup node 0 [mem 0x0000000000000000-0x000000007fffffff]
percpu: Embedded 3 pages/cpu @c00000007fe00000 s158616 r0 d37992 u1048576
Built 1 zonelists, mobility grouping on.  Total pages: 32736
Policy zone: DMA
Kernel command line:=20
PID hash table entries: 4096 (order: -1, 32768 bytes)
Memory: 2060800K/2097152K available (10112K kernel code, 1600K rwdata, 27=

52K rodata, 896K init, 1413K bss, 36352K reserved, 0K cma-reserved)

SLUB: HWalign=3D128, Order=3D0-3, MinObjects=3D0, CPUs=3D1, Nodes=3D1
Hierarchical RCU implementation.
	RCU event tracing is enabled.
	RCU restricting CPUs from NR_CPUS=3D2048 to nr_cpu_ids=3D1.
RCU: Adjusting geometry for rcu_fanout_leaf=3D16, nr_cpu_ids=3D1
NR_IRQS: 512, nr_irqs: 512, preallocated irqs: 16
clocksource: timebase: mask: 0xffffffffffffffff max_cycles: 0x761537d007,=

 max_idle_ns: 440795202126 ns

clocksource: timebase mult[1f40000] shift[24] registered
Console: colour dummy device 80x25
console [hvc0] enabled
console [hvc0] enabled
bootconsole [udbg0] disabled
bootconsole [udbg0] disabled
pid_max: default: 32768 minimum: 301
Dentry cache hash table entries: 262144 (order: 5, 2097152 bytes)
Inode-cache hash table entries: 131072 (order: 4, 1048576 bytes)
Mount-cache hash table entries: 8192 (order: 0, 65536 bytes)
Mountpoint-cache hash table entries: 8192 (order: 0, 65536 bytes)
EEH: pSeries platform initialized
POWER8 performance monitor hardware support registered
Hierarchical SRCU implementation.
smp: Bringing up secondary CPUs ...
smp: Brought up 1 node, 1 CPU
numa: Node 0 CPUs: 0
devtmpfs: initialized
random: get_random_u32 called from bucket_table_alloc+0x144/0x380 with cr=

ng_init=3D0

clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_n=

s: 19112604462750000 ns

futex hash table entries: 256 (order: -1, 32768 bytes)
NET: Registered protocol family 16
EEH: No capable adapters found
cpuidle: using governor menu
kworker/u2:1 (27) used greatest stack depth: 13872 bytes left
kworker/u2:1 (28) used greatest stack depth: 13584 bytes left
random: fast init done
kworker/u2:0 (17) used greatest stack depth: 12192 bytes left
pstore: using zlib compression
pstore: Registered nvram as persistent store backend
Linux ppc64le
#2 SMP Tue Aug 2PCI: Probing PCI hardware
PCI host bridge to bus 0000:00
pci_bus 0000:00: root bus resource [io  0x10000-0x1ffff] (bus address [0x=

0000-0xffff])

pci_bus 0000:00: root bus resource [mem 0x200080000000-0x2000ffffffff] (b=

us address [0x80000000-0xffffffff])

pci_bus 0000:00: root bus resource [mem 0x210000000000-0x21ffffffffff]
pci_bus 0000:00: root bus resource [bus 00-ff]
IOMMU table initialized, virtual merging enabled
HugeTLB registered 16.0 MiB page size, pre-allocated 0 pages
HugeTLB registered 16.0 GiB page size, pre-allocated 0 pages
vgaarb: loaded
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
pps_core: LinuxPPS API ver. 1 registered
pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <gio=

metti@linux.it>

PTP clock support registered
clocksource: Switched to clocksource timebase
Watchdog CPU:0 Hard LOCKUP
Modules linked in:
CPU: 0 PID: 7 Comm: ksoftirqd/0 Not tainted 4.13.0-rc6 #2
task: c00000007e62e100 task.stack: c00000007e658000
NIP: c00000000017bb68 LR: c00000000017bb68 CTR: c000000000106330
REGS: c00000003ffefd80 TRAP: 0900   Not tainted  (4.13.0-rc6)
MSR: 8000000002009033 <SF,VEC,EE,ME,IR,DR,RI,LE>
  CR: 24000802  XER: 00000000
CFAR: c0000000009dbc34 SOFTE: 0=20
GPR00: c00000000017bb68 c00000007e65b9b0 c000000000ea5a00 000000000000000=

0=20

GPR04: c00000007e65ba30 c00000007e160000 8000000000000000 c00000007e65bbe=

8=20

GPR08: 0000000000000004 0000000000000000 0000000080000000 c00000007fe0fea=

8=20

GPR12: c000000000106330 c00000000fd40000 c0000000001128b8 c00000007e15018=

0=20

GPR16: 0000000000000100 0000000004208040 c00000007e658000 000000000000000=

0=20

GPR20: c000000000d74f00 c000000000ed3b00 00000000ffff8af5 000000000000000=

a=20

GPR24: c000000000d74f00 c000000000d5fe80 c000000000eddbf8 c00000007e65ba3=

0=20

GPR28: c000000000d5ee00 c00000007e160048 c00000007fe0fe80 000000007fc8000=

0=20

NIP [c00000000017bb68] lock_timer_base+0x98/0xf0
LR [c00000000017bb68] lock_timer_base+0x98/0xf0
Call Trace:
[c00000007e65b9b0] [c00000000017bb68] lock_timer_base+0x98/0xf0 (unreliab=

le)

[c00000007e65ba10] [c00000000017ed9c] mod_timer+0x2fc/0x350
[c00000007e65ba80] [c000000000106468] idle_worker_timeout+0x138/0x190
[c00000007e65bac0] [c00000000017de28] call_timer_fn+0x58/0x1c0
[c00000007e65bb50] [c00000000017e100] expire_timers+0x140/0x1e0
[c00000007e65bbc0] [c00000000017e348] run_timer_softirq+0x1a8/0x230
[c00000007e65bc50] [c0000000009dc7f0] __do_softirq+0x170/0x3e4
[c00000007e65bd40] [c0000000000eef9c] run_ksoftirqd+0x3c/0xb0
[c00000007e65bd60] [c000000000118500] smpboot_thread_fn+0x290/0x2a0
[c00000007e65bdc0] [c000000000112a10] kthread+0x160/0x1a0
[c00000007e65be30] [c00000000000bae0] ret_from_kernel_thread+0x5c/0x7c
Instruction dump:
7be91ae8 4082ffec 7d5a482a 7be96fe3 7fdc5214 893e0025 2f890000 419e000c=

=20

41820008 7fcaca14 7fc3f378 48860065 <60000000> f87b0000 7c641b78 7fc3f378=

=20

INFO: rcu_sched self-detected stall on CPU
	0-...: (2100 ticks this GP) idle=3D002/140000000000001/0 softirq=3D183/1=

83 fqs=3D0=20

	 (t=3D2100 jiffies g=3D-278 c=3D-279 q=3D136)
rcu_sched kthread starved for 2100 jiffies! g18446744073709551338 c184467=

44073709551337 f0x0 RCU_GP_WAIT_FQS(3) ->state=3D0x0 ->cpu=3D0

rcu_sched       R  running task    13216     8      2 0x00000800
Call Trace:
[c00000007e65f8d0] [c00000007e65fbd0] 0xc00000007e65fbd0 (unreliable)
[c00000007e65faa0] [c00000000001b678] __switch_to+0x298/0x460
[c00000007e65fb00] [c0000000009d5524] __schedule+0x3e4/0xab0
[c00000007e65fbe0] [c0000000009d5c30] schedule+0x40/0xb0
[c00000007e65fc10] [c0000000009da4bc] schedule_timeout+0x1fc/0x440
[c00000007e65fcf0] [c0000000001754ac] rcu_gp_kthread+0x60c/0x1090
[c00000007e65fdc0] [c000000000112a10] kthread+0x160/0x1a0
[c00000007e65fe30] [c00000000000bae0] ret_from_kernel_thread+0x5c/0x7c
NMI backtrace for cpu 0
CPU: 0 PID: 7 Comm: ksoftirqd/0 Not tainted 4.13.0-rc6 #2
Call Trace:
[c00000007e65b200] [c0000000009bbfa0] dump_stack+0xb0/0xf0 (unreliable)
[c00000007e65b240] [c0000000009c4cb8] nmi_cpu_backtrace+0x208/0x210
[c00000007e65b2d0] [c0000000009c4ea0] nmi_trigger_cpumask_backtrace+0x1e0=

/0x220

[c00000007e65b360] [c00000000002d100] arch_trigger_cpumask_backtrace+0x20=

/0x40

0=20

GPR04: 0000000000000001 c00000007e160000 8000000000000000 000000000000000=

0=20

GPR08: c00000000fd40000 0000000000000012 0000000000000000 c00000007fe0fea=

8=20

GPR12: c000000000106330 c00000000fd40000=20
NIP [c00000000000ad4c] .L1=0242+0x0/0x4
LR [c000000000015ae4] arch_local_irq_restore+0x74/0x90
Call Trace:
[c00000007e65bb30] [c000000000d74f00] irq_stat+0x0/0x80 (unreliable)
[c00000007e65bb50] [c00000000017e0ec] expire_timers+0x12c/0x1e0
[c00000007e65bbc0] [c00000000017e348] run_timer_softirq+0x1a8/0x230
[c00000007e65bc50] [c0000000009dc7f0] __do_softirq+0x170/0x3e4
[c00000007e65bd40] [c0000000000eef9c] run_ksoftirqd+0x3c/0xb0
[c00000007e65bd60] [c000000000118500] smpboot_thread_fn+0x290/0x2a0
[c00000007e65bdc0] [c000000000112a10] kthread+0x160/0x1a0
[c00000007e65be30] [c00000000000bae0] ret_from_kernel_thread+0x5c/0x7c
Instruction dump:
7d200026 618c8000 2c030900 4182e348 2c030500 4182dda0 2c030a00 4182ffc0=

=20

60000000 60000000 60000000 60000000 <4e800020> 7c781b78 48000331 48000349=

=20

timeout waiting for login
=20
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 BAD BAD BAD BAD BAD BAD BAD BAD BAD BAD=20
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!