An Artful SRU request for these commits was already submitted in bug
1706247. I'm working on backporting them to Xenial(4.4 based), but have
had some issues with build failures. There are some prereq commits that
are also needed for 4.4 kernels. I'll see what the extent of these
prereqs are and post an update.
If there are too many prereqs for Xenial, we may have to have this
issues address in Xenial via the HWE kernels, but I'm investigating.
** Changed in: linux (Ubuntu)
Status: Triaged => In Progress
** Also affects: linux (Ubuntu Zesty)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Xenial)
Status: New => In Progress
** Changed in: linux (Ubuntu Zesty)
Status: New => In Progress
** Changed in: linux (Ubuntu Xenial)
Importance: Undecided => High
** Changed in: linux (Ubuntu Zesty)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1724120
Title:
Ubuntu 16.04.3 - call traces occurs when memory-hotplug test is run
with 16Gb hugepages configured
Status in The Ubuntu-power-systems project:
Triaged
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Xenial:
In Progress
Status in linux source package in Zesty:
In Progress
Bug description:
Issue:
Call traces occurs when memory-hotplug script is run with 16Gb
hugepages configured.
Environment:
ppc64le PowerVM Lpar
root@ltctuleta-lp1:~# uname -r
4.4.0-34-generic
root@ltctuleta-lp1:~# cat /proc/meminfo | grep -i huge
AnonHugePages: 0 kB
HugePages_Total: 2
HugePages_Free: 2
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 16777216 kB
root@ltctuleta-lp1:~# free -h
total used free shared buff/cache
available
Mem: 85G 32G 52G 16M 193M
52G
Swap: 43G 0B 43G
Steps to reproduce:
1 - Download kernel source and enter to the directory-
tools/testing/selftests/memory-hotplug/
2 - Run mem-on-off-test.sh script in it.
System gives call traces like:
offline_memory_expect_success 639: unexpected fail
online-offline 668
[ 57.552964] Unable to handle kernel paging request for data at address
0x00000028
[ 57.552977] Faulting instruction address: 0xc00000000029bc04
[ 57.552987] Oops: Kernel access of bad area, sig: 11 [#1]
[ 57.552992] SMP NR_CPUS=2048 NUMA pSeries
[ 57.553002] Modules linked in: btrfs xor raid6_pq pseries_rng sunrpc
autofs4 ses enclosure nouveau bnx2x i2c_algo_bit ttm drm_kms_helper syscopyarea
sysfillrect sysimgblt fb_sys_fops drm vxlan ip6_udp_tunnel ipr udp_tunnel
rtc_generic mdio libcrc32c
[ 57.553050] CPU: 44 PID: 6518 Comm: mem-on-off-test Not tainted
4.4.0-34-generic #53-Ubuntu
[ 57.553059] task: c00000072773c8e0 ti: c000000727780000 task.ti:
c000000727780000
[ 57.553067] NIP: c00000000029bc04 LR: c00000000029bbdc CTR:
c0000000001107f0
[ 57.553076] REGS: c000000727783770 TRAP: 0300 Not tainted
(4.4.0-34-generic)
[ 57.553083] MSR: 8000000100009033 <SF,EE,ME,IR,DR,RI,LE> CR: 24242882
XER: 00000002
[ 57.553104] CFAR: c000000000008468 DAR: 0000000000000028 DSISR: 40000000
SOFTE: 1
GPR00: c00000000029bbdc c0000007277839f0 c0000000015b5d00 0000000000000000
GPR04: 000000000029d000 0000000000000800 0000000000000000 f00000000a000001
GPR08: f00000000a700020 0000000000000008 c00000000185e270 c000000e7e000050
GPR12: 0000000000002200 c00000000e6ea200 000000000029d000 0000000022000000
GPR16: 1000000000000000 c0000000015e2200 000000000a700000 0000000000000000
GPR20: 0000000000010000 0000000000000100 0000000000000200 c0000000015f16d0
GPR24: c000000001876510 0000000000000000 0000000000000001 c000000001872a00
GPR28: 000000000029d000 f000000000000000 f00000000a700000 000000000029c000
[ 57.553211] NIP [c00000000029bc04] dissolve_free_huge_pages+0x154/0x220
[ 57.553219] LR [c00000000029bbdc] dissolve_free_huge_pages+0x12c/0x220
[ 57.553226] Call Trace:
[ 57.553231] [c0000007277839f0] [c00000000029bbdc]
dissolve_free_huge_pages+0x12c/0x220 (unreliable)
[ 57.553244] [c000000727783a80] [c0000000002dcbc8]
__offline_pages.constprop.6+0x3f8/0x900
[ 57.553254] [c000000727783bd0] [c0000000006fbb38]
memory_subsys_offline+0xa8/0x110
[ 57.553265] [c000000727783c00] [c0000000006d6424]
device_offline+0x104/0x140
[ 57.553274] [c000000727783c40] [c0000000006fba80]
store_mem_state+0x180/0x190
[ 57.553283] [c000000727783c80] [c0000000006d1e58] dev_attr_store+0x68/0xa0
[ 57.553293] [c000000727783cc0] [c000000000398110] sysfs_kf_write+0x80/0xb0
[ 57.553302] [c000000727783d00] [c000000000397028]
kernfs_fop_write+0x188/0x200
[ 57.553312] [c000000727783d50] [c0000000002e190c] __vfs_write+0x6c/0xe0
[ 57.553321] [c000000727783d90] [c0000000002e2640] vfs_write+0xc0/0x230
[ 57.553329] [c000000727783de0] [c0000000002e367c] SyS_write+0x6c/0x110
[ 57.553339] [c000000727783e30] [c000000000009204] system_call+0x38/0xb4
[ 57.553346] Instruction dump:
[ 57.553351] 7e831836 4bfff991 e91e0028 e8fe0020 7d32e82a f9070008 f8e80000
fabe0020
[ 57.553366] fade0028 79294620 79291764 7d234a14 <e9030028> 3908ffff
f9030028 81091458
[ 57.553383] ---[ end trace 617f7bdd75bcfc10 ]---
[ 57.557133]
Segmentation fault
The following commit IDs were built into a 4.10.0-37-generic #41 test
kernel and verified to fix the problem:
a525108cf1cc14651602d678da38fa627a76a724
e1073d1e7920946ac4776a619cc40668b9e1401b
40692eb5eea209c2dd55857f44b4e1d7206e91d6
e24a1307ba1f99fc62a0bd61d5e87fcfb6d5503d
79cc38ded1e1ac86e69c90f604efadd50b0b3762
4ae279c2c96ab38a78b954d218790a8f6db714e5
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