This issue can be reproduce with 4.15.0-90 / 4.15.0-88
[ 94.916925] BUG: non-zero pgtables_bytes on freeing mm: 16384
[ 94.917898] BUG: non-zero pgtables_bytes on freeing mm: 16384
[ 95.810214] LTP: starting hugeshmctl01 (hugeshmctl01 -i 5)
[ 96.815430] report_user_fault: 41 callbacks suppressed
[ 96.815431] User process fault: interruption code 003b ilc:2 in
hugeshmctl01[2aa2fc80000+25000]
[ 96.815444] Failing address: 0000020000000000 TEID: 0000020000000400
[ 96.815445] Fault in primary space mode while using user ASCE.
[ 96.815448] AS:000000079c0441c7 R3:0000000000000024
[ 96.815452] CPU: 0 PID: 3288 Comm: hugeshmctl01 Tainted: P O
4.15.0-90-generic #91-Ubuntu
[ 96.815453] Hardware name: IBM 2964 N63 400 (LPAR)
[ 96.815455] User PSW : 000000009f0ad0ae 000000000332f726
[ 96.815456] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:2 PM:0
RI:0 EA:3
[ 96.815458] User GPRS: 0000000000000000 000002aa00000002 0000000000000000
0000000000000004
[ 96.815459] 000002aa2fc86602 000003ff9421ecf8 0000000000000000
0000000000000000
[ 96.815460] 000003ff00000002 000002aa00000000 000002aa00000000
0000020000000000
[ 96.815460] 000003ff94426000 000002aa2fc9b300 000002aa2fc86602
000003fff1cfe5e8
[ 96.815469] User Code: 000002aa2fc86640: e31010000012 lt
%r1,0(%r1)
000002aa2fc86646: a7840038 brc
8,000002aa2fc866b6
#000002aa2fc8664a: c4b80001061b lgrl
%r11,000002aa2fca7280
>000002aa2fc86650: 50a0b000 st
%r10,0(%r11)
000002aa2fc86654: a7690001 lghi %r6,1
000002aa2fc86658: a7590000 lghi %r5,0
000002aa2fc8665c: a7490000 lghi %r4,0
000002aa2fc86660: a739008d lghi %r3,141
[ 96.815480] Last Breaking-Event-Address:
[ 96.815484] [<000002aa2fc86602>] 0x2aa2fc86602
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https://bugs.launchpad.net/bugs/1866196
Title:
hugeshmctl01 from hugetlb in ubuntu_ltp failed on B
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