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SubjectProblems with rcutorture on ppc64le: allmodconfig(2) and other failures
Dear Linux folks,


On an IBM S822LC SL822 (ppc64le) with Ubuntu 21.04, I tried to torture
the RCU. allmodconfig(2) failed though.

```
$ git describe
v5.16-10660-g0c947b893d69
$ tools/testing/selftests/rcutorture/bin/torture.sh --duration 10
--- tools/testing/selftests/rcutorture/bin/torture.sh --duration 10
--- Results directory: 2022.01.17-18.44.36-torture
--- allmodconfig: Start Mon Jan 17 06:44:36 PM CET 2022
--- rcutorture: Start Mon Jan 17 06:45:02 PM CET 2022
--- rcutorture-kasan: Start Mon Jan 17 07:07:41 PM CET 2022
--- locktorture: Start Mon Jan 17 07:33:38 PM CET 2022
--- locktorture-kasan: Start Mon Jan 17 07:37:05 PM CET 2022
--- scftorture: Start Mon Jan 17 07:40:54 PM CET 2022
--- scftorture-kasan: Start Mon Jan 17 07:43:31 PM CET 2022
--- refscale-rcu: Start Mon Jan 17 07:46:34 PM CET 2022
--- refscale-rcu-kasan: Start Mon Jan 17 07:49:08 PM CET 2022
--- refscale-srcu: Start Mon Jan 17 07:52:05 PM CET 2022
--- refscale-srcu-kasan: Start Mon Jan 17 07:54:39 PM CET 2022
--- refscale-rcu-tasks: Start Mon Jan 17 07:57:35 PM CET 2022
--- refscale-rcu-tasks-kasan: Start Mon Jan 17 08:00:10 PM CET 2022
--- refscale-rcu-trace: Start Mon Jan 17 08:03:06 PM CET 2022
--- refscale-rcu-trace-kasan: Start Mon Jan 17 08:05:40 PM CET 2022
--- refscale-refcnt: Start Mon Jan 17 08:08:40 PM CET 2022
--- refscale-refcnt-kasan: Start Mon Jan 17 08:11:15 PM CET 2022
--- refscale-rwlock: Start Mon Jan 17 08:14:14 PM CET 2022
--- refscale-rwlock-kasan: Start Mon Jan 17 08:16:48 PM CET 2022
--- refscale-rwsem: Start Mon Jan 17 08:19:45 PM CET 2022
--- refscale-rwsem-kasan: Start Mon Jan 17 08:22:18 PM CET 2022
--- refscale-lock: Start Mon Jan 17 08:25:17 PM CET 2022
--- refscale-lock-kasan: Start Mon Jan 17 08:27:53 PM CET 2022
--- refscale-lock-irq: Start Mon Jan 17 08:30:58 PM CET 2022
--- refscale-lock-irq-kasan: Start Mon Jan 17 08:33:42 PM CET 2022
--- refscale-acqrel: Start Mon Jan 17 08:36:58 PM CET 2022
--- refscale-acqrel-kasan: Start Mon Jan 17 08:39:33 PM CET 2022
--- refscale-clock: Start Mon Jan 17 08:42:33 PM CET 2022
--- refscale-clock-kasan: Start Mon Jan 17 08:45:08 PM CET 2022
--- rcuscale-rcu: Start Mon Jan 17 08:48:06 PM CET 2022
--- rcuscale-rcu-kasan: Start Mon Jan 17 08:49:25 PM CET 2022
--- rcuscale-srcu: Start Mon Jan 17 08:50:56 PM CET 2022
--- rcuscale-srcu-kasan: Start Mon Jan 17 08:52:14 PM CET 2022
--- rcuscale-srcud: Start Mon Jan 17 08:53:43 PM CET 2022
--- rcuscale-srcud-kasan: Start Mon Jan 17 08:55:01 PM CET 2022
--- rcuscale-tasks: Start Mon Jan 17 08:56:31 PM CET 2022
--- rcuscale-tasks-kasan: Start Mon Jan 17 08:57:48 PM CET 2022
--- rcuscale-tasks-tracing: Start Mon Jan 17 08:59:17 PM CET 2022
--- rcuscale-tasks-tracing-kasan: Start Mon Jan 17 09:00:35 PM CET 2022
--- rcuscale-kvfree: Start Mon Jan 17 09:02:05 PM CET 2022
--- rcuscale-kvfree-kasan: Start Mon Jan 17 09:03:23 PM CET 2022
--- clocksourcewd-1: Start Mon Jan 17 09:04:52 PM CET 2022
--- clocksourcewd-1-kasan: Start Mon Jan 17 09:06:11 PM CET 2022
--- clocksourcewd-2: Start Mon Jan 17 09:07:42 PM CET 2022
--- clocksourcewd-2-kasan: Start Mon Jan 17 09:08:59 PM CET 2022
--- tools/testing/selftests/rcutorture/bin/torture.sh --duration 10
--- Done Mon Jan 17 09:10:29 PM CET 2022
SUCCESSES:
rcutorture(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcutorture
rcutorture-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcutorture-kasan
locktorture(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-locktorture
locktorture-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-locktorture-kasan
scftorture(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-scftorture
scftorture-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-scftorture-kasan
refscale-rcu(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-rcu
refscale-rcu-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-rcu-kasan
refscale-srcu(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-srcu
refscale-srcu-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-srcu-kasan
refscale-rcu-tasks(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-rcu-tasks
refscale-rcu-tasks-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-rcu-tasks-kasan
refscale-rcu-trace(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-rcu-trace
refscale-rcu-trace-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-rcu-trace-kasan
refscale-refcnt(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-refcnt
refscale-refcnt-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-refcnt-kasan
refscale-rwlock(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-rwlock
refscale-rwlock-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-rwlock-kasan
refscale-rwsem(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-rwsem
refscale-rwsem-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-rwsem-kasan
refscale-lock(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-lock
refscale-lock-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-lock-kasan
refscale-lock-irq(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-lock-irq
refscale-lock-irq-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-lock-irq-kasan
refscale-acqrel(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-acqrel
refscale-acqrel-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-acqrel-kasan
refscale-clock(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-clock
refscale-clock-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-refscale-clock-kasan
rcuscale-rcu(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcuscale-rcu
rcuscale-rcu-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcuscale-rcu-kasan
rcuscale-srcu(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcuscale-srcu
rcuscale-srcu-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcuscale-srcu-kasan
rcuscale-srcud(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcuscale-srcud
rcuscale-srcud-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcuscale-srcud-kasan
rcuscale-tasks(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcuscale-tasks
rcuscale-tasks-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcuscale-tasks-kasan
rcuscale-tasks-tracing(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcuscale-tasks-tracing
rcuscale-tasks-tracing-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcuscale-tasks-tracing-kasan
rcuscale-kvfree(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcuscale-kvfree
rcuscale-kvfree-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcuscale-kvfree-kasan
clocksourcewd-1(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-clocksourcewd-1
clocksourcewd-1-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-clocksourcewd-1-kasan
clocksourcewd-2(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-clocksourcewd-2
clocksourcewd-2-kasan(0)
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-clocksourcewd-2-kasan
FAILURES:
allmodconfig(2)
tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/allmodconfig
Started at Mon Jan 17 06:44:36 PM CET 2022, ended at Mon Jan 17 09:10:29
PM CET 2022, duration 2:25:53.
Summary: Successes: 44 Failures: 1.
Size before compressing 0 files: 86M Mon Jan 17 09:10:29 PM CET 2022
Waiting for final batch 1 of 22 compressions Mon Jan 17 09:10:29 PM CET 2022
Size after compressing 0 files: 86M Mon Jan 17 09:10:29 PM CET 2022
Total duration 2:25:53.
```

Here is an excerpt from `Make.out` [1]:

```
CC [M] sound/isa/ad1848/ad1848.o
CC security/keys/encrypted-keys/ecryptfs_format.o
In file included from <command-line>:
././include/linux/kconfig.h:5:10: fatal error: generated/autoconf.h: No
such file or directory
5 | #include <generated/autoconf.h>
| ^~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
CC [M] fs/reiserfs/inode.o
In file included from <command-line>:
././include/linux/kconfig.h:5:10: fatal error: generated/autoconf.h: No
such file or directory
5 | #include <generated/autoconf.h>
| ^~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
In file included from <command-line>:
././include/linux/kconfig.h:5:10: fatal error: generated/autoconf.h: No
such file or directory
5 | #include <generated/autoconf.h>
| ^~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[3]: *** [scripts/Makefile.build:288:
security/keys/encrypted-keys/ecryptfs_format.o] Error 1
make[3]: *** Waiting for unfinished jobs....
In file included from <command-line>:
././include/linux/kconfig.h:5:10: fatal error: generated/autoconf.h: No
such file or directory
5 | #include <generated/autoconf.h>
| ^~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
CC [M] sound/i2c/i2c.o
In file included from <command-line>:
././include/linux/kconfig.h:5:10: fatal error: generated/autoconf.h: No
such file or directory
5 | #include <generated/autoconf.h>
| ^~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
CC [M] fs/ext4/block_validity.o
make[3]: *** [scripts/Makefile.build:288: sound/isa/ad1848/ad1848.o] Error 1
make[2]: *** [scripts/Makefile.build:550: sound/isa/ad1848] Error 2
make[1]: *** [scripts/Makefile.build:550: sound/isa] Error 2
make[1]: *** Waiting for unfinished jobs....
```

I wonder why other builds seem to have worked. But checking the other
results, despite the output saying the runs were a success the Linux
kernel builds seem to have failed. For example [2]:

```
$ more
tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcutorture/log
tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration 7
--configs CFLIST --trust-make --bootargs
rcupdate.rcu_cpu_stall_suppress_at_boot=1 torture.disable_onoff_at_boot
rcupdate.rcu_task_stall_timeout=30000 --datestamp
2022.01.17-18.44.36-torture/results-rcutorture
----Start batch 1: Mon Jan 17 06:45:03 PM CET 2022
TREE03 16: Starting build. Mon Jan 17 06:45:03 PM CET 2022
[…]
TREE09 1: Build complete. Mon Jan 17 07:07:40 PM CET 2022
---- No kernel runs. Mon Jan 17 07:07:40 PM CET 2022
---- TREE03 16: Build/run results:
--- Mon Jan 17 06:45:03 PM CET 2022: Starting build, PID 3530842
:CONFIG_HYPERVISOR_GUEST=y: improperly set
:CONFIG_PARAVIRT=y: improperly set
Kernel build error
make[2]: *** No rule to make target
'arch/powerpc/kvm//dev/shm/linux/tools/testing/selftests/rcutorture/kvm_main.o',
needed by 'arch/powerpc/kvm/kvm.o'. Stop.
make[1]: *** [scripts/Makefile.build:550: arch/powerpc/kvm] Error 2
make: *** [Makefile:1840: arch/powerpc] Error 2
Run aborted.
Build failed, not running KVM, see
/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcutorture/TREE03.
[…]
ESC[031mBUG: ESC[mBuild failed

/dev/shm/linux/tools/testing/selftests/rcutorture/res/2022.01.17-18.44.36-torture/results-rcutorture/TREE09
--- Done at Mon Jan 17 07:07:41 PM CET 2022 (22:39.0) exitcode 0
```


Kind regards,

Paul


[1]: https://owww.molgen.mpg.de/~pmenzel/allmodconf-Make.out.txt
[2]: https://owww.molgen.mpg.de/~pmenzel/rcutorture-log.txt

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