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Hi All, <br>
<br>
I am running LTP to test cpuset test cases. I have created new command file after copying 2 commands from runltp.
<br>
<br>
cpuset_load_balance cpuset_load_balance_test.sh <br>
cpuset_base_ops cpuset_base_ops_testset.sh <br>
<br>
with above sequence, crash is happening <br>
<br>
[10546.587463] Workqueue: cgroup_destroy css_killed_work_fn <br>
[10546.592762] pstate: 80400009 (Nzcv daif +PAN -UAO) <br>
[10546.597550] pc : build_sched_domains+0x244/0xb48 <br>
[10546.602154] lr : build_sched_domains+0x228/0xb48 <br>
[10546.606757] sp : ffff000031fc3b70 <br>
[10546.610059] x29: ffff000031fc3b70 x28: ffff00001157d730 <br>
[10546.615357] x27: ffff0000115a7000 x26: ffff00001118d000 <br>
[10546.620655] x25: 00000000000000e0 x24: 0000000000000000 <br>
[10546.625953] x23: ffff00001118dc80 x22: ffff00001157d730 <br>
[10546.631251] x21: ffff80bf54723940 x20: ffff80bded3aef00 <br>
[10546.636549] x19: ffff00001157f1e4 x18: 0000000000000000 <br>
[10546.641848] x17: 0000000000000000 x16: 0000000000000000 <br>
.546 <br>
kernel:Internal error: Oops: 96000007 [#1] SMP <br>
[10546.661905] x13: 00000000ffffffff x12: ffffffff00000000 <br>
[10546.667203] x11: 0000000000000000 x10: 0000000000000000 <br>
[10546.672501] x9 : 0000000000000000 x8 : ffff80bded45c000 <br>
[10546.677799] x7 : 0000000000000000 x6 : 000000000000003f <br>
[10546.683097] x5 : 0000000000000040 x4 : 0000000000000000 <br>
[10546.688395] x3 : 0000000000000000 x2 : 0000000000000000 <br>
[10546.693693] x1 : ffff00001118dc80 x0 : 00000000ffffffff <br>
[10546.698991] Call trace: <br>
[10546.701426] build_sched_domains+0x244/0xb48 <br>
[10546.705684] partition_sched_domains+0x1dc/0x2dc <br>
[10546.710300] rebuild_sched_domains_locked+0x64/0xa8 <br>
[10546.715166] update_flag+0x174/0x190 <br>
[10546.718729] cpuset_css_offline+0xb0/0xc8 <br>
[10546.722725] css_killed_work_fn+0x54/0x118 <br>
[10546.726811] process_one_work+0x1b4/0x3d8 <br>
[10546.730807] worker_thread+0x4c/0x420 <br>
[10546.734463] kthread+0x108/0x138 <br>
[10546.737685] ret_from_fork+0x10/0x18 <br>
[10546.741249] Code: aa0003e1 12800000 f862dac2 aa0103f7 (f8616855) <br>
[10546.747330] ---[ end trace c4f1497fb4a860c8 ]--- <br>
<br>
<br>
Strangely, If I run sequence [1] or [2] no crash is happening <br>
[1] <br>
cpuset_load_balance cpuset_load_balance_test.sh <br>
cpuset_load_balance cpuset_load_balance_test.sh <br>
<br>
[2] <br>
cpuset_load_balance cpuset_load_balance_test.sh <br>
cpuset_sched_domains cpuset_sched_domains_test.sh <br>
cpuset_hotplug cpuset_hotplug_test.sh <br>
<br>
What I can infer that the cpuset_load_balance, cpuset_sched_domains, cpuset_hotplug are usig cpuset_set(). While cpuset_base_ops doesnt use cpuset_set().
<br>
Also, combination of cpuset_load_balance with any cpuset tests <b class="moz-txt-star">
<span class="moz-txt-tag">*</span>not<span class="moz-txt-tag">*</span></b> using cpuset_set() causing above type of crash.
<br>
<br>
I have seen this crash on Linux 5.09 and 5.4.rc0 kernel. <br>
<br>
<br>
Any clue will help me in moving forward. <br>
<br>
<br>
<a class="moz-txt-link-freetext" href="https://github.com/linux-test-project/ltp.git">https://github.com/linux-test-project/ltp.git</a>
<br>
top commit: <br>
commit ff3c9780438040ab955fdf4167ffae4e612a311d (HEAD -> master, origin/master, origin/HEAD)
<br>
Author: Petr Vorel <a class="moz-txt-link-rfc2396E" href="mailto:pvorel@suse.cz">
<pvorel@suse.cz></a> <br>
Date: Wed Oct 2 12:51:04 2019 +0200 <br>
<br>
lib: Replace GPL verbose text by SPDX license identifier <br>
<br>
from library sources for new API. <br>
<br>
Signed-off-by: Petr Vorel <a class="moz-txt-link-rfc2396E" href="mailto:pvorel@suse.cz">
<pvorel@suse.cz></a> <br>
<br>
--prabhakar <br>
<br>
<br>
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