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[Bug runtime/17126] New: tracepoints.exp testcase causing stalls/hang on ppc64


https://sourceware.org/bugzilla/show_bug.cgi?id=17126

            Bug ID: 17126
           Summary: tracepoints.exp testcase causing stalls/hang on ppc64
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com
            Target: ppc64

When I run the tracepoints.exp testcase on RHEL7 ppc64 (3.10.0-123.el7.ppc64),
the testcase never finishes and can't be interrupted. The console output
reports several processor stalls:

====
[  517.597905] stap_1fc11586ceeef8b8c42a1c32930268cd_4_3498: module
verification failed: signature and/or required key missing - tainting kernel
[  577.656336] INFO: rcu_sched detected stalls on CPUs/tasks: { 0} (detected by
17, t=6003 jiffies, g=614, c=613, q=0)
[  577.656360] Task dump for CPU 0:
[  577.656364] swapper/0       R  running task        0     0      0 0x00000000
[  577.656372] Call Trace:
[  577.656378] [c000000001273820] [0000007e43fbfed6] 0x7e43fbfed6 (unreliable)
[  577.656389] [c0000000012739f0] [c000000001273aa0]
init_thread_union+0x3aa0/0x4000
[  577.656396] [c000000001273a80] [c000000001273b10]
init_thread_union+0x3b10/0x4000
[  637.676283] INFO: rcu_sched detected stalls on CPUs/tasks: { 7 12 13 16}
(detected by 17, t=6002 jiffies, g=615, c=614, q=0)
[  637.676306] Task dump for CPU 7:
[  637.676311] swapper/7       R  running task        0     0      1 0x00000804
[  637.676318] Call Trace:
[  637.676323] [c0000003ccbc3870] [0000006d368b1ce6] 0x6d368b1ce6 (unreliable)
[  637.676331] [c0000003ccbc3a40] [0000000000000c00] 0xc00
[  637.676336] Task dump for CPU 12:
[  637.676340] swapper/12      R  running task        0     0      1 0x00000800
[  637.676347] Call Trace:
[  637.676351] [c0000003ccbd7870] [000000592709e938] 0x592709e938 (unreliable)
[  637.676359] [c0000003ccbd7a40] [0000000000000c00] 0xc00
[  637.676364] Task dump for CPU 13:
[  637.676367] swapper/13      R  running task        0     0      1 0x00000800
[  637.676374] Call Trace:
[  637.676379] [c0000003ccbdb870] [c00000000011b63c]
.find_busiest_group+0x2ec/0x930 (unreliable)
[  637.676387] [c0000003ccbdba40] [0000000000000c00] 0xc00
[  637.676392] Task dump for CPU 16:
[  637.676395] stapio          R  running task        0  3498   3497 0x00008084
[  637.676402] Call Trace:
[  637.676406] [c0000003c43ab540] [c0000003d3ec3d00] 0xc0000003d3ec3d00
(unreliable)
[  637.676415] [c0000003c43ab710] [c000000000c50380] decrementers+0x0/0x100
[  817.746133] INFO: rcu_sched detected stalls on CPUs/tasks: { 7 12 13 16}
(detected by 17, t=24008 jiffies, g=615, c=614, q=0)
[  817.746157] Task dump for CPU 7:
[  817.746161] swapper/7       R  running task        0     0      1 0x00000804
[  817.746169] Call Trace:
[  817.746174] [c0000003ccbc3870] [0000006d368b1ce6] 0x6d368b1ce6 (unreliable)
[  817.746182] [c0000003ccbc3a40] [0000000000000c00] 0xc00
[  817.746187] Task dump for CPU 12:
[  817.746191] swapper/12      R  running task        0     0      1 0x00000800
[  817.746197] Call Trace:
[  817.746201] [c0000003ccbd7870] [000000592709e938] 0x592709e938 (unreliable)
[  817.746209] [c0000003ccbd7a40] [0000000000000c00] 0xc00
[  817.746214] Task dump for CPU 13:
[  817.746217] swapper/13      R  running task        0     0      1 0x00000800
[  817.746224] Call Trace:
[  817.746229] [c0000003ccbdb870] [c00000000011b63c]
.find_busiest_group+0x2ec/0x930 (unreliable)
[  817.746237] [c0000003ccbdba40] [0000000000000c00] 0xc00
[  817.746242] Task dump for CPU 16:
[  817.746245] stapio          R  running task        0  3498   3497 0x00008084
[  817.746252] Call Trace:
[  817.746256] [c0000003c43ab540] [c0000003d3ec3d00] 0xc0000003d3ec3d00
(unreliable)
[  817.746264] [c0000003c43ab710] [c000000000c50380] decrementers+0x0/0x100
[  997.785985] INFO: rcu_sched detected stalls on CPUs/tasks: { 7 12 13 16}
(detected by 15, t=42013 jiffies, g=615, c=614, q=0)
[  997.786018] Task dump for CPU 7:
[  997.786024] swapper/7       R  running task        0     0      1 0x00000804
[  997.786034] Call Trace:
[  997.786043] [c0000003ccbc3870] [0000006d368b1ce6] 0x6d368b1ce6 (unreliable)
[  997.786053] [c0000003ccbc3a40] [0000000000000c00] 0xc00
[  997.786060] Task dump for CPU 12:
[  997.786065] swapper/12      R  running task        0     0      1 0x00000800
[  997.786074] Call Trace:
[  997.786079] [c0000003ccbd7870] [000000592709e938] 0x592709e938 (unreliable)
[  997.786089] [c0000003ccbd7a40] [0000000000000c00] 0xc00
[  997.786095] Task dump for CPU 13:
[  997.786100] swapper/13      R  running task        0     0      1 0x00000804
[  997.786109] Call Trace:
[  997.786117] [c0000003ccbdb870] [c00000000011b63c]
.find_busiest_group+0x2ec/0x930 (unreliable)
[  997.786130] [c0000003ccbdba40] [0000000000000c00] 0xc00
[  997.786137] Task dump for CPU 16:
[  997.786141] stapio          R  running task        0  3498   3497 0x00008084
[  997.786150] Call Trace:
[  997.786155] [c0000003c43ab540] [c0000003d3ec3d00] 0xc0000003d3ec3d00
(unreliable)
[  997.786166] [c0000003c43ab710] [c000000000c50380] decrementers+0x0/0x100
[ 1177.835828] INFO: rcu_sched detected stalls on CPUs/tasks: { 7 12 13 16}
(detected by 17, t=60018 jiffies, g=615, c=614, q=0)
[ 1177.835853] Task dump for CPU 7:
[ 1177.835857] swapper/7       R  running task        0     0      1 0x00000804
[ 1177.835865] Call Trace:
[ 1177.835870] [c0000003ccbc3870] [0000006d368b1ce6] 0x6d368b1ce6 (unreliable)
[ 1177.835878] [c0000003ccbc3a40] [0000000000000c00] 0xc00
[ 1177.835883] Task dump for CPU 12:
[ 1177.835887] swapper/12      R  running task        0     0      1 0x00000800
[ 1177.835893] Call Trace:
[ 1177.835897] [c0000003ccbd7870] [000000592709e938] 0x592709e938 (unreliable)
[ 1177.835905] [c0000003ccbd7a40] [0000000000000c00] 0xc00
[ 1177.835909] Task dump for CPU 13:
[ 1177.835913] swapper/13      R  running task        0     0      1 0x00000804
[ 1177.835919] Call Trace:
[ 1177.835924] [c0000003ccbdb870] [c00000000011b63c]
.find_busiest_group+0x2ec/0x930 (unreliable)
[ 1177.835932] [c0000003ccbdba40] [0000000000000c00] 0xc00
[ 1177.835937] Task dump for CPU 16:
[ 1177.835941] stapio          R  running task        0  3498   3497 0x00008084
[ 1177.835947] Call Trace:
[ 1177.835951] [c0000003c43ab540] [c0000003d3ec3d00] 0xc0000003d3ec3d00
(unreliable)
[ 1177.835959] [c0000003c43ab710] [c000000000c50380] decrementers+0x0/0x100
[ 1357.905677] INFO: rcu_sched detected stalls on CPUs/tasks: { 7 12 13 16}
(detected by 17, t=78024 jiffies, g=615, c=614, q=0)
[ 1357.905702] Task dump for CPU 7:
[ 1357.905706] swapper/7       R  running task        0     0      1 0x00000804
[ 1357.905713] Call Trace:
[ 1357.905718] [c0000003ccbc3870] [0000006d368b1ce6] 0x6d368b1ce6 (unreliable)
[ 1357.905726] [c0000003ccbc3a40] [0000000000000c00] 0xc00
[ 1357.905732] Task dump for CPU 12:
[ 1357.905735] swapper/12      R  running task        0     0      1 0x00000800
[ 1357.905742] Call Trace:
[ 1357.905746] [c0000003ccbd7870] [000000592709e938] 0x592709e938 (unreliable)
[ 1357.905753] [c0000003ccbd7a40] [0000000000000c00] 0xc00
[ 1357.905758] Task dump for CPU 13:
[ 1357.905762] swapper/13      R  running task        0     0      1 0x00000804
[ 1357.905768] Call Trace:
[ 1357.905773] [c0000003ccbdb870] [c00000000011b63c]
.find_busiest_group+0x2ec/0x930 (unreliable)
[ 1357.905781] [c0000003ccbdba40] [0000000000000c00] 0xc00
[ 1357.905786] Task dump for CPU 16:
[ 1357.905790] stapio          R  running task        0  3498   3497 0x00008084
[ 1357.905796] Call Trace:
[ 1357.905800] [c0000003c43ab540] [c0000003d3ec3d00] 0xc0000003d3ec3d00
(unreliable)
[ 1357.905808] [c0000003c43ab710] [c000000000c50380] decrementers+0x0/0x100
[ 1538.005524] INFO: rcu_sched detected stalls on CPUs/tasks: { 7 12 13 16}
(detected by 17, t=96034 jiffies, g=615, c=614, q=0)
[ 1538.005548] Task dump for CPU 7:
[ 1538.005553] swapper/7       R  running task        0     0      1 0x00000804
[ 1538.005560] Call Trace:
[ 1538.005565] [c0000003ccbc3870] [0000006d368b1ce6] 0x6d368b1ce6 (unreliable)
[ 1538.005573] [c0000003ccbc3a40] [0000000000000c00] 0xc00
[ 1538.005578] Task dump for CPU 12:
[ 1538.005582] swapper/12      R  running task        0     0      1 0x00000800
[ 1538.005589] Call Trace:
[ 1538.005592] [c0000003ccbd7870] [000000592709e938] 0x592709e938 (unreliable)
[ 1538.005600] [c0000003ccbd7a40] [0000000000000c00] 0xc00
[ 1538.005605] Task dump for CPU 13:
[ 1538.005608] swapper/13      R  running task        0     0      1 0x00000804
[ 1538.005615] Call Trace:
[ 1538.005620] [c0000003ccbdb870] [c00000000011b63c]
.find_busiest_group+0x2ec/0x930 (unreliable)
[ 1538.005628] [c0000003ccbdba40] [0000000000000c00] 0xc00
[ 1538.005633] Task dump for CPU 16:
[ 1538.005636] stapio          R  running task        0  3498      1 0x00008084
[ 1538.005643] Call Trace:
[ 1538.005647] [c0000003c43ab540] [c0000003d3ec3d00] 0xc0000003d3ec3d00
(unreliable)
[ 1538.005655] [c0000003c43ab710] [c000000000c50380] decrementers+0x0/0x100
====

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