linux-kernel - [next-20170609] Oops while running CPU off-on (cpuset.c/cpuset_can

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Date:   Mon, 12 Jun 2017 16:53:42 +0530
From:   Abdul Haleem <abdhalee@...ux.vnet.ibm.com>
To:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Cc:     Tejun Heo <tj@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        mpe <mpe@...erman.id.au>, sachinp <sachinp@...ux.vnet.ibm.com>,
        ego <ego@...ux.vnet.ibm.com>
Subject: [next-20170609] Oops while running CPU off-on
 (cpuset.c/cpuset_can_attach)

Hi,

linux-next kernel crashed while running CPU offline and online.

Machine: Power 8 LPAR
Kernel : 4.12.0-rc4-next-20170609
gcc : version 5.2.1
config: attached
testcase: CPU off/on

for i in $(seq 100);do 
    for j in $(seq 0 15);do 
        echo 0 >  /sys/devices/system/cpu/cpu$j/online
        sleep 5
        echo 1 > /sys/devices/system/cpu/cpu$j/online
    done
done

kernel trace:
--------------
Unable to handle kernel paging request for data at address 0x00000960
Faulting instruction address: 0xc0000000001d6868
Oops: Kernel access of bad area, sig: 11 [#1]
SMP NR_CPUS=2048
NUMA
pSeries
Modules linked in: dlci mpls_router af_key 8021q garp mrp nfc af_alg
caif_socket caif pn_pep phonet fcrypt pcbc rxrpc hidp hid cmtp
kernelcapi bnep rfcomm bluetooth ecdh_generic can_bcm can_raw can pptp
gre l2tp_ppp l2tp_netlink l2tp_core ip6_udp_tunnel udp_tunnel pppoe
pppox irda xfrm_user xfrm_algo nfnetlink scsi_transport_iscsi dn_rtmsg
llc2 dccp_ipv6 atm appletalk ipx p8023 p8022 psnap sctp dccp_ipv4 dccp
xt_addrtype xt_conntrack ipt_MASQUERADE nf_nat_masquerade_ipv4
iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 iptable_filter
ip_tables x_tables nf_nat nf_conntrack bridge stp llc dm_thin_pool
dm_persistent_data dm_bio_prison dm_bufio libcrc32c rtc_generic
vmx_crypto pseries_rng autofs4
CPU: 14 PID: 16947 Comm: kworker/14:0 Tainted: G        W
4.12.0-rc4-next-20170609 #2
Workqueue: events cpuset_hotplug_workfn
task: c00000000ca60580 task.stack: c00000000c728000
NIP: c0000000001d6868 LR: c0000000001d6858 CTR: c0000000001d6810
REGS: c00000000c72b720 TRAP: 0300   Tainted: G        W
(4.12.0-rc4-next-20170609)
MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE>
  CR: 44722422  XER: 20000000  
CFAR: c000000000008710 DAR: 0000000000000960 DSISR: 40000000 SOFTE: 1 
GPR00: c0000000001d6858 c00000000c72b9a0 c000000001536e00
0000000000000000 
GPR04: c00000000c72b9c0 0000000000000000 c00000000c72bad0
c000000766367678 
GPR08: c000000766366d10 c00000000c72b958 c000000001736e00
0000000000000000 
GPR12: c0000000001d6810 c00000000e749300 c000000000123ef8
c000000775af4180 
GPR16: 0000000000000000 0000000000000000 c00000075480e9c0
c00000075480e9e0 
GPR20: c00000075480e8c0 0000000000000001 0000000000000000
c00000000c72ba20 
GPR24: c00000000c72baa0 c00000000c72bac0 c000000001407248
c00000000c72ba20 
GPR28: c00000000141fc80 c00000000c72bac0 c00000000c6bc790
0000000000000000 
NIP [c0000000001d6868] cpuset_can_attach+0x58/0x1b0
LR [c0000000001d6858] cpuset_can_attach+0x48/0x1b0
Call Trace:
[c00000000c72b9a0] [c0000000001d6858] cpuset_can_attach+0x48/0x1b0
(unreliable)
[c00000000c72ba00] [c0000000001cbe80] cgroup_migrate_execute+0xb0/0x450
[c00000000c72ba80] [c0000000001d3754] cgroup_transfer_tasks+0x1c4/0x360
[c00000000c72bba0] [c0000000001d923c] cpuset_hotplug_workfn+0x86c/0xa20
[c00000000c72bca0] [c00000000011aa44] process_one_work+0x1e4/0x580
[c00000000c72bd30] [c00000000011ae78] worker_thread+0x98/0x5c0
[c00000000c72bdc0] [c000000000124058] kthread+0x168/0x1b0
[c00000000c72be30] [c00000000000b2e8] ret_from_kernel_thread+0x5c/0x74
Instruction dump:
f821ffa1 7c7d1b78 60000000 60000000 38810020 7fa3eb78 3f42ffed 4bff4c25 
60000000 3b5a0448 3d420020 eb610020 <e9230960> 7f43d378 e9290000
f92af200 
---[ end trace dcaaf98fb36d9e64 ]---



-- 
Regard's

Abdul Haleem
IBM Linux Technology Centre



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