Re: mlockall(MCL_CURRENT) blocking infinitely

From: Robert Stupp
Date: Fri Oct 25 2019 - 09:45:59 EST

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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

Next message: Colin King: "[PATCH] media: zr364xx: remove redundant assigmnent to idx, clean up code"
Previous message: Johannes Weiner: "Re: [PATCH 5/8] mm: vmscan: replace shrink_node() loop with a retry jump"
In reply to: Michal Hocko: "Re: mlockall(MCL_CURRENT) blocking infinitely"
Next in thread: Michal Hocko: "Re: mlockall(MCL_CURRENT) blocking infinitely"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]