[Bug runtime/31500] stapio exited with irqs disabled

["wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31500

William Cohen <wcohen at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |wcohen at redhat dot com

--- Comment #1 from William Cohen <wcohen at redhat dot com> ---
This being encountered in during a regular "make installcheck"? Or are multiple
runs requireed to trigger this?

Is this running inside a guest VM or bare hardware?

How many cores does the machine running the tests have?

Does the problem go away when the number of available cores is reduced (or even
limited to 1)?

I wonder if the "stapio[188000] exited with irqs disabled" is causing the
"workqueue: drain_vmap_area_work hogged CPU for ..." messages.

It would also be good to fully understand the following in the dmesg output. 
What is CR2 (and CR3/CR4 etc.) referring to:

[16452.767193] CR2: ffffffffa64a65c0
[16452.769368] ---[ end trace 0000000000000000 ]---
[16452.771499] RIP: 0010:arch_adjust_kprobe_addr+0x41/0xe0
[16452.773611] Code: 48 89 d3 48 ba 00 00 00 00 00 fc ff df 48 83 ec 08 0f b6
0c 11 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 85 00 00 00 <8b> 55 00
81 fa 66 0f 1f 00 74 4f 81 e2 ff ff ff fe b9 0c f0 e1 05
[16452.777850] RSP: 0018:ffffc90002027960 EFLAGS: 00010246
[16452.779941] RAX: 0000000000000001 RBX: ffffc90002027a58 RCX:
0000000000000000
[16452.782014] RDX: 0000000000000003 RSI: 0000000000000000 RDI:
ffffffffa64a65c0
[16452.784058] RBP: ffffffffa64a65c0 R08: fffffbfff4858cff R09:
0000000000000000
[16452.786089] R10: 0000000000000000 R11: 0000000000000001 R12:
1ffff92000404f31
[16452.788180] R13: ffffffffc10ca498 R14: 0000000000000000 R15:
ffffffffc20ada98
[16452.790166] FS:  00007f1eaa74a180(0000) GS:ffff888115400000(0000)
knlGS:0000000000000000
[16452.792138] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[16452.794077] CR2: ffffffffa64a65c0 CR3: 000000010e99e005 CR4:
0000000000370ef0
[16452.796007] DR0: 0000000000404010 DR1: 0000000000000000 DR2:
0000000000000000
[16452.797910] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000600
[16452.799774] note: stapio[188000] exited with irqs disabled

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