[Bug runtime/20820] another "soft lockup" BUG on RHEL7 ppc64

["dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20820

--- Comment #1 from David Smith <dsmith at redhat dot com> ---
Here a similar lockup BUG, but on the debug kernel (3.10.0-327.el7.ppc64.debug)
and running the testsuite in non-parallel mode:

====
Nov 16 10:23:47kernel: BUG: soft lockup - CPU#9 stuck for 23s! [stapio:24254]
Nov 16 10:23:47kernel: Modules linked in:
stap_7764bfaa23b11806ef1c60b256715ff_24254(OE) sg pseries_rng nfsd auth_rpcgss
nfs_acl lockd grace sunrpc ip_tables xfs libcrc32c sd_mod crc_t10dif
crct10dif_generic crct10dif_common ibmvscsi scsi_transport_srp ibmveth scsi_tgt
dm_mirror dm_region_hash dm_log dm_mod [last unloaded:
stap_1f80bbd166a09dc1edf99396614ca76_23951]
Nov 16 10:23:47kernel: irq event stamp: 0
Nov 16 10:23:47kernel: hardirqs last  enabled at (0): [<          (null)>]     
     (null)
Nov 16 10:23:47kernel: hardirqs last disabled at (0): [<c0000000000ce5dc>]
.copy_process.part.22+0x5dc/0x1040
Nov 16 10:23:47kernel: softirqs last  enabled at (0): [<c0000000000ce5dc>]
.copy_process.part.22+0x5dc/0x1040
Nov 16 10:23:47kernel: softirqs last disabled at (0): [<          (null)>]     
     (null)
Nov 16 10:23:47kernel: CPU: 9 PID: 24254 Comm: stapio Tainted: G           OE 
------------   3.10.0-327.el7.ppc64.debug #1
Nov 16 10:23:47kernel: task: c0000005ebe0ee70 ti: c0000005f0a80000 task.ti:
c0000005f0a80000
Nov 16 10:23:47kernel: NIP: d00000000aba4a78 LR: d00000000aba742c CTR:
c00000000053e540
Nov 16 10:23:47kernel: REGS: c0000005f0a83740 TRAP: 0901   Tainted: G          
OE  ------------    (3.10.0-327.el7.ppc64.debug)
Nov 16 10:23:47kernel: MSR: 8000000000009032 <SF,EE,ME,IR,DR,RI>  CR: 84004422 
XER: 00000007
Nov 16 10:23:47kernel: CFAR: d00000000aba7428 SOFTE: 1
                                                             GPR00:
d00000000aba742c c0000005f0a839c0 d00000000abba0f0 d00000000ce40000
                                                             GPR04:
000000000004c318 00000000000000e9 002db0ae77b1770f ffffffffc2b2ae35
                                                             GPR08:
000000000001ffff 0f670cfa7d56e501 c5ebf91ebfada51d 000000000fea18bf
                                                             GPR12:
c00000000053e540 c000000007b35100
Nov 16 10:23:47kernel: NIP [d00000000aba4a78] ._stp_map_set_ii+0xc8/0x180
[stap_7764bfaa23b11806ef1c60b256715ff_24254]
Nov 16 10:23:47kernel: LR [d00000000aba742c] .probe_2893+0xfc/0x1a60
[stap_7764bfaa23b11806ef1c60b256715ff_24254]
Nov 16 10:23:47kernel: Call Trace:
Nov 16 10:23:47kernel: [c0000005f0a839c0] [d00000000aba1048]
._new_map_create+0x58/0xf0 [stap_7764bfaa23b11806ef1c60b256715ff_24254]
(unreliable)
Nov 16 10:23:47kernel: [c0000005f0a83a50] [d00000000aba742c]
.probe_2893+0xfc/0x1a60 [stap_7764bfaa23b11806ef1c60b256715ff_24254]
Nov 16 10:23:47kernel: [c0000005f0a83b20] [d00000000aba9acc]
.enter_be_probe+0x1bc/0x360 [stap_7764bfaa23b11806ef1c60b256715ff_24254]
Nov 16 10:23:47kernel: [c0000005f0a83bc0] [d00000000abaaef8]
.systemtap_module_init+0xa18/0xaa0 [stap_7764bfaa23b11806ef1c60b256715ff_24254]
Nov 16 10:23:47kernel: [c0000005f0a83cd0] [d00000000abab52c]
._stp_ctl_write_cmd+0x5ac/0x7c0 [stap_7764bfaa23b11806ef1c60b256715ff_24254]
Nov 16 10:23:47kernel: [c0000005f0a83d80] [c00000000034cf6c]
.SyS_write+0x14c/0x400
Nov 16 10:23:47kernel: [c0000005f0a83e30] [c00000000000a188]
system_call+0x38/0xb4
Nov 16 10:23:47kernel: Instruction dump:
Nov 16 10:23:47kernel: 7d494a78 7d4941d6 8103005c 55499b7e 7d2a5278 7d2a39d6
5524843e 7c844a78
Nov 16 10:23:47kernel: 7c844038 78840020 3884000c 78841f24 <7d23202a> 7c832214
2fa90000 419e008c
====

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