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    SubjectRe: mlockall(MCL_CURRENT) blocking infinitely
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    Date
    On Fri, 2019-10-25 at 15:27 +0200, Michal Hocko wrote:
    > On Fri 25-10-19 15:10:39, Robert Stupp wrote:
    > [...]
    > > cat /proc/$(pidof test)/smaps
    >
    > Nothing really unusual that would jump at me except for
    > > 7f8be90ed000-7f8be9265000 r-xp 00025000 103:02
    > > 44307431 /lib/x86_64-linux-gnu/libc-2.30.so
    > > Size: 1504 kB
    > > KernelPageSize: 4 kB
    > > MMUPageSize: 4 kB
    > > Rss: 832 kB
    > > Pss: 5 kB
    > > Shared_Clean: 832 kB
    > > Shared_Dirty: 0 kB
    > > Private_Clean: 0 kB
    > > Private_Dirty: 0 kB
    > > Referenced: 832 kB
    > > Anonymous: 0 kB
    > > LazyFree: 0 kB
    > > AnonHugePages: 0 kB
    > > ShmemPmdMapped: 0 kB
    > > Shared_Hugetlb: 0 kB
    > > Private_Hugetlb: 0 kB
    > > Swap: 0 kB
    > > SwapPss: 0 kB
    > > Locked: 5 kB
    >
    > Huh, 5kB, is this really the case or some copy&paste error?
    > How can we end up with !pagesize multiple here?
    >
    > > THPeligible: 0
    > > VmFlags: rd ex mr mw me lo sd

    mlockall() seems to lock everything though, it just never returns.

    Pretty sure that it's not a copy&paste error. Got a couple more runs
    that have an "odd size" - this time with 3kB...
    All "Locked" values seem to be okay - except that one. And it's always
    odd for the same one (the one with `Size: 1504 kB`).
    It's not always odd (3 kB or 5 kB) though - sometimes it says 4 kB.
    Seems it's a little breadcrumb?


    560429953000-560429954000 r--p 00000000 103:02
    49172550 /home/snazy/devel/misc/zzz/test
    Size: 4 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 4 kB
    Pss: 4 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 4 kB
    Private_Dirty: 0 kB
    Referenced: 4 kB
    Anonymous: 0 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 4 kB
    THPeligible: 0
    VmFlags: rd mr mw me dw lo sd
    560429954000-560429955000 r-xp 00001000 103:02
    49172550 /home/snazy/devel/misc/zzz/test
    Size: 4 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 4 kB
    Pss: 4 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 4 kB
    Private_Dirty: 0 kB
    Referenced: 4 kB
    Anonymous: 0 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 4 kB
    THPeligible: 0
    VmFlags: rd ex mr mw me dw lo sd
    560429955000-560429956000 r--p 00002000 103:02
    49172550 /home/snazy/devel/misc/zzz/test
    Size: 4 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 4 kB
    Pss: 4 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 4 kB
    Private_Dirty: 0 kB
    Referenced: 4 kB
    Anonymous: 0 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 4 kB
    THPeligible: 0
    VmFlags: rd mr mw me dw lo sd
    560429956000-560429957000 r--p 00002000 103:02
    49172550 /home/snazy/devel/misc/zzz/test
    Size: 4 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 4 kB
    Pss: 4 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 4 kB
    Referenced: 4 kB
    Anonymous: 4 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 4 kB
    THPeligible: 0
    VmFlags: rd mr mw me dw lo ac sd
    560429957000-560429958000 rw-p 00003000 103:02
    49172550 /home/snazy/devel/misc/zzz/test
    Size: 4 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 4 kB
    Pss: 4 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 4 kB
    Referenced: 4 kB
    Anonymous: 4 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 4 kB
    THPeligible: 0
    VmFlags: rd wr mr mw me dw lo ac sd
    5604299e7000-560429a08000 rw-p 00000000 00:00
    0 [heap]
    Size: 132 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 132 kB
    Pss: 132 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 132 kB
    Referenced: 132 kB
    Anonymous: 132 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 132 kB
    THPeligible: 0
    VmFlags: rd wr mr mw me lo ac sd
    7f243057c000-7f24305a1000 r--p 00000000 103:02
    44307431 /lib/x86_64-linux-gnu/libc-2.30.so
    Size: 148 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 144 kB
    Pss: 0 kB
    Shared_Clean: 144 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 0 kB
    Referenced: 144 kB
    Anonymous: 0 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 0 kB
    THPeligible: 0
    VmFlags: rd mr mw me lo sd
    7f24305a1000-7f2430719000 r-xp 00025000 103:02
    44307431 /lib/x86_64-linux-gnu/libc-2.30.so
    Size: 1504 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 816 kB
    Pss: 3 kB
    Shared_Clean: 816 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 0 kB
    Referenced: 816 kB
    Anonymous: 0 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 3 kB
    THPeligible: 0
    VmFlags: rd ex mr mw me lo sd
    7f2430719000-7f2430763000 r--p 0019d000 103:02
    44307431 /lib/x86_64-linux-gnu/libc-2.30.so
    Size: 296 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 128 kB
    Pss: 0 kB
    Shared_Clean: 128 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 0 kB
    Referenced: 128 kB
    Anonymous: 0 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 0 kB
    THPeligible: 0
    VmFlags: rd mr mw me lo sd
    7f2430763000-7f2430766000 r--p 001e6000 103:02
    44307431 /lib/x86_64-linux-gnu/libc-2.30.so
    Size: 12 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 12 kB
    Pss: 12 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 12 kB
    Referenced: 12 kB
    Anonymous: 12 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 12 kB
    THPeligible: 0
    VmFlags: rd mr mw me lo ac sd
    7f2430766000-7f2430769000 rw-p 001e9000 103:02
    44307431 /lib/x86_64-linux-gnu/libc-2.30.so
    Size: 12 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 12 kB
    Pss: 12 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 12 kB
    Referenced: 12 kB
    Anonymous: 12 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 12 kB
    THPeligible: 0
    VmFlags: rd wr mr mw me lo ac sd
    7f2430769000-7f243076f000 rw-p 00000000 00:00 0
    Size: 24 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 24 kB
    Pss: 24 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 24 kB
    Referenced: 24 kB
    Anonymous: 24 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 24 kB
    THPeligible: 0
    VmFlags: rd wr mr mw me lo ac sd
    7f243079a000-7f243079b000 r--p 00000000 103:02
    44302414 /lib/x86_64-linux-gnu/ld-2.30.so
    Size: 4 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 4 kB
    Pss: 0 kB
    Shared_Clean: 4 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 0 kB
    Referenced: 4 kB
    Anonymous: 0 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 0 kB
    THPeligible: 0
    VmFlags: rd mr mw me dw lo sd
    7f243079b000-7f24307bd000 r-xp 00001000 103:02
    44302414 /lib/x86_64-linux-gnu/ld-2.30.so
    Size: 136 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 136 kB
    Pss: 0 kB
    Shared_Clean: 136 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 0 kB
    Referenced: 136 kB
    Anonymous: 0 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 0 kB
    THPeligible: 0
    VmFlags: rd ex mr mw me dw lo sd
    7f24307bd000-7f24307c5000 r--p 00023000 103:02
    44302414 /lib/x86_64-linux-gnu/ld-2.30.so
    Size: 32 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 32 kB
    Pss: 0 kB
    Shared_Clean: 32 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 0 kB
    Referenced: 32 kB
    Anonymous: 0 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 0 kB
    THPeligible: 0
    VmFlags: rd mr mw me dw lo sd
    7f24307c6000-7f24307c7000 r--p 0002b000 103:02
    44302414 /lib/x86_64-linux-gnu/ld-2.30.so
    Size: 4 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 4 kB
    Pss: 4 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 4 kB
    Referenced: 4 kB
    Anonymous: 4 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 4 kB
    THPeligible: 0
    VmFlags: rd mr mw me dw lo ac sd
    7f24307c7000-7f24307c8000 rw-p 0002c000 103:02
    44302414 /lib/x86_64-linux-gnu/ld-2.30.so
    Size: 4 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 4 kB
    Pss: 4 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 4 kB
    Referenced: 4 kB
    Anonymous: 4 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 4 kB
    THPeligible: 0
    VmFlags: rd wr mr mw me dw lo ac sd
    7f24307c8000-7f24307c9000 rw-p 00000000 00:00 0
    Size: 4 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 4 kB
    Pss: 4 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 4 kB
    Referenced: 4 kB
    Anonymous: 4 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 4 kB
    THPeligible: 0
    VmFlags: rd wr mr mw me lo ac sd
    7ffe7d4d0000-7ffe7d4f2000 rw-p 00000000 00:00
    0 [stack]
    Size: 136 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 20 kB
    Pss: 20 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 20 kB
    Referenced: 20 kB
    Anonymous: 20 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 20 kB
    THPeligible: 0
    VmFlags: rd wr mr mw me gd lo ac
    7ffe7d502000-7ffe7d505000 r--p 00000000 00:00
    0 [vvar]
    Size: 12 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 0 kB
    Pss: 0 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 0 kB
    Referenced: 0 kB
    Anonymous: 0 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 0 kB
    THPeligible: 0
    VmFlags: rd mr pf io de dd sd
    7ffe7d505000-7ffe7d506000 r-xp 00000000 00:00
    0 [vdso]
    Size: 4 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 4 kB
    Pss: 0 kB
    Shared_Clean: 4 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 0 kB
    Referenced: 4 kB
    Anonymous: 0 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 0 kB
    THPeligible: 0
    VmFlags: rd ex mr mw me de sd
    ffffffffff600000-ffffffffff601000 --xp 00000000 00:00
    0 [vsyscall]
    Size: 4 kB
    KernelPageSize: 4 kB
    MMUPageSize: 4 kB
    Rss: 0 kB
    Pss: 0 kB
    Shared_Clean: 0 kB
    Shared_Dirty: 0 kB
    Private_Clean: 0 kB
    Private_Dirty: 0 kB
    Referenced: 0 kB
    Anonymous: 0 kB
    LazyFree: 0 kB
    AnonHugePages: 0 kB
    ShmemPmdMapped: 0 kB
    Shared_Hugetlb: 0 kB
    Private_Hugetlb: 0 kB
    Swap: 0 kB
    SwapPss: 0 kB
    Locked: 0 kB
    THPeligible: 0
    VmFlags: ex


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