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    SubjectRe: [PATCH] mapletree-vs-khugepaged
    Date
    * Sven Schnelle <svens@linux.ibm.com> [220513 10:46]:
    > Heiko Carstens <hca@linux.ibm.com> writes:
    >
    > > On Thu, Apr 28, 2022 at 10:20:40AM -0700, Guenter Roeck wrote:
    > >> On Wed, Apr 27, 2022 at 03:10:45PM -0700, Andrew Morton wrote:
    > >> > Fix mapletree for patch series "Make khugepaged collapse readonly FS THP
    > >> > more consistent", v3.
    > >> >
    > >> > Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
    > >> > Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    > >>
    > >> This patch causes all my sparc64 boot tests to fail. Bisect and crash logs
    > >> attached.
    > >>
    > >> Guenter
    > >>

    ....

    > >
    > > FWIW, same on s390 - linux-next is completely broken. Note: I didn't
    > > bisect, but given that the call trace, and even the failing address
    > > match, I'm quite confident it is the same reason.
    > >
    > > Unable to handle kernel pointer dereference in virtual kernel address space
    > > Failing address: 0e00000000000000 TEID: 0e00000000000803
    > > Fault in home space mode while using kernel ASCE.
    > > AS:00000000bac44007 R3:00000001ffff0007 S:00000001fffef800 P:000000000000003d
    > > Oops: 0038 ilc:3 [#1] SMP
    > > CPU: 3 PID: 79757 Comm: pt_upgrade_race Tainted: G E K 5.18.0-20220428.rc4.git500.bdc61aad77fa.300.fc35.s390x+next #1
    > > Hardware name: IBM 2964 NC9 702 (z/VM 6.4.0)
    > > Krnl PSW : 0704c00180000000 00000000b912c9a2 (mmap_region+0x1a2/0x8a8)
    > > R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3
    > > Krnl GPRS: 0000000000000000 0e00000000000000 0000000000000000 0000000000000000
    > > ffffffffffffffff 000000000000000f 00000380016b3d98 0000080000100000
    > > 000000008364c100 0000080000000000 0000000000100077 0e00000000000000
    > > 00000000909da100 00000380016b3c58 00000000b912c982 00000380016b3b40
    > > Krnl Code: 00000000b912c992: a774002c brc 7,00000000b912c9ea
    > > 00000000b912c996: ecb80225007c cgij %r11,0,8,00000000b912cde0
    > > #00000000b912c99c: e310f0f80004 lg %r1,248(%r15)
    > > >00000000b912c9a2: e37010000020 cg %r7,0(%r1)
    > > 00000000b912c9a8: a784010b brc 8,00000000b912cbbe
    > > 00000000b912c9ac: e310f0e80004 lg %r1,232(%r15)
    > > 00000000b912c9b2: ec180013007c cgij %r1,0,8,00000000b912c9d8
    > > 00000000b912c9b8: e310f0e80004 lg %r1,232(%r15)
    > > Call Trace:
    > > [<00000000b912c9a2>] mmap_region+0x1a2/0x8a8
    > > ([<00000000b912c982>] mmap_region+0x182/0x8a8)
    > > [<00000000b912d492>] do_mmap+0x3ea/0x4c8
    > > [<00000000b90fb9cc>] vm_mmap_pgoff+0xd4/0x170
    > > [<00000000b9129c9a>] ksys_mmap_pgoff+0x62/0x238
    > > [<00000000b912a034>] __s390x_sys_old_mmap+0x74/0x98
    > > [<00000000b9a78ff8>] __do_syscall+0x1d8/0x200
    > > [<00000000b9a872a2>] system_call+0x82/0xb0
    > > Last Breaking-Event-Address:
    > > [<00000000b9b9e678>] __s390_indirect_jump_r14+0x0/0xc
    > > Kernel panic - not syncing: Fatal exception: panic_on_oops
    >
    > Starting today we're still seeing the same crash with linux-next from
    > (next-20220513):
    >
    > [ 211.937897] CPU: 7 PID: 535 Comm: pt_upgrade Not tainted 5.18.0-rc6-11648-g76535d42eb53-dirty #732
    > [ 211.937902] Unable to handle kernel pointer dereference in virtual kernel address space
    > [ 211.937903] Hardware name: IBM 3906 M04 704 (z/VM 7.1.0)
    > [ 211.937906] Failing address: 0e00000000000000 TEID: 0e00000000000803
    > [ 211.937909] Krnl PSW : 0704c00180000000 0000001ca52f06d6
    > [ 211.937910] Fault in home space mode while using kernel ASCE.
    > [ 211.937917] AS:0000001ca6e24007 R3:0000001fffff0007 S:0000001ffffef800 P:000000000000003d
    > [ 211.937914] (mmap_region+0x19e/0x848)
    > [ 211.937929] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3
    > [ 211.937939] Krnl GPRS: 0000000000000000 0e00000000000000 0000000000000000 0000000000000000
    > [ 211.937942] ffffffff00000f0f ffffffffffffffff 0e00000000000000 0000040000001000
    > [ 211.937945] 0000000083551900 0000040000000000 00000000000000fb 000003800070fc58
    > [ 211.937947] 000000008f490000 0000000000000000 0000001ca52f06b6 000003800070fb48
    > [ 211.937959] Krnl Code: 0000001ca52f06c6: a7740021 brc 7,0000001ca52f0708
    > [ 211.937959] 0000001ca52f06ca: ec6801b3007c cgij %r6,0,8,0000001ca52f0a30
    > [ 211.937959] #0000001ca52f06d0: e310f0f80004 lg %r1,248(%r15)
    > [ 211.937959] >0000001ca52f06d6: e37010000020 cg %r7,0(%r1)
    > [ 211.937959] 0000001ca52f06dc: a78400ea brc 8,0000001ca52f08b0
    > [ 211.937959] 0000001ca52f06e0: e310f0f00004 lg %r1,240(%r15)
    > [ 211.937959] 0000001ca52f06e6: ec180008007c cgij %r1,0,8,0000001ca52f06f6
    > [ 211.937959] 0000001ca52f06ec: e39010080020 cg %r9,8(%r1)
    > [ 211.937973] Call Trace:
    > [ 211.937975] [<0000001ca52f06d6>] mmap_region+0x19e/0x848
    > [ 211.937978] ([<0000001ca52f06b6>] mmap_region+0x17e/0x848)
    > [ 211.937981] [<0000001ca52f116a>] do_mmap+0x3ea/0x4c8
    > [ 211.937983] [<0000001ca52bed12>] vm_mmap_pgoff+0xda/0x178
    > [ 211.937987] [<0000001ca52ed5ea>] ksys_mmap_pgoff+0x62/0x238
    > [ 211.937989] [<0000001ca52ed992>] __s390x_sys_old_mmap+0x7a/0xa0
    > [ 211.937993] [<0000001ca5c4ef5c>] __do_syscall+0x1d4/0x200
    > [ 211.937999] [<0000001ca5c5d572>] system_call+0x82/0xb0
    > [ 211.938002] Last Breaking-Event-Address:
    > [ 211.938003] [<0000001ca5888616>] mas_prev+0xb6/0xc0
    > [ 211.938010] Oops: 0038 ilc:3 [#2]
    > [ 211.938011] Kernel panic - not syncing: Fatal exception: panic_on_oops
    > [ 211.938012] SMP
    > [ 211.938014] Modules linked in:
    > 07: HCPGIR450W CP entered; disabled wait PSW 00020001 80000000 0000001C
    > A50679A6
    >
    > IS that issue supposed to be fixed? git bisect pointed me to
    >
    > # bad: [76535d42eb53485775a8c54ea85725812b75543f] Merge branch
    > 'mm-everything' of
    > git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
    >
    > which isn't really helpful.
    >
    > Anything we could help with debugging this?

    I tested the maple tree on top of the s390 as it was the same crash and
    it was okay. I haven't tested the mm-everything branch though. Can you
    test mm-unstable?

    I'll continue setting up a sparc VM for testing here and test
    mm-everything on that and the s390

    Thanks,
    Liam
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