[Bug 224080] ZFS: "arc_dnlc_evicts_thr" + "arc_reclaim_thread" - high CPU load during poudriere build...

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224080

Mark Millard <markmi at dsl-only.net> changed:

           What    |Removed                     |Added
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                 CC|                            |markmi at dsl-only.net

--- Comment #37 from Mark Millard <markmi at dsl-only.net> ---
There is also the rpi2 and UFS tied list submittals against
-r326347 causing booting to hang, starting with:

https://lists.freebsd.org/pipermail/freebsd-hackers/2017-December/051939.html

and ending with:

https://lists.freebsd.org/pipermail/freebsd-hackers/2017-December/051947.html

There are tied to boot hangs with the kernel
thread (100001) involving:

. . .
uma_zcreate() at uma_zcreate+0x10c
         pc = 0xc052b024  lr = 0xc050cc90 (ffs_mount+0x80)
         sp = 0xd42a5858  fp = 0xd42a5980
         r4 = 0xd7844000  r5 = 0x00000000
         r6 = 0x00000003  r7 = 0xc09a99c0
         r8 = 0x00000000  r9 = 0xd429f000
        r10 = 0xd828c400
ffs_mount() at ffs_mount+0x80
         pc = 0xc050cc90  lr = 0xc032e1d4 (vfs_donmount+0xeec)
         sp = 0xd42a5988  fp = 0xd42a5b38
         r4 = 0xffffffff  r5 = 0xd74ec120
         r6 = 0xd429f000  r7 = 0x00000000
         r8 = 0x00000000  r9 = 0xc425acd0
        r10 = 0xd828c400
. . .

and the uma thread involving:

. . .
uma_reclaim_locked() at uma_reclaim_locked+0x200
         pc = 0xc052d9f8  lr = 0xc052de70 (uma_reclaim_worker+0x4c)
         sp = 0xd87dadf0  fp = 0xd87dae20
         r4 = 0xc09a9c68  r5 = 0xc4242d80
         r6 = 0xc06df86e  r7 = 0x00000000
         r8 = 0x00000100  r9 = 0xc09b3d08
        r10 = 0xc09a9c7c
uma_reclaim_worker() at uma_reclaim_worker+0x4c
         pc = 0xc052de70  lr = 0xc0230f10 (fork_exit+0xa0)
         sp = 0xd87dae28  fp = 0xd87dae40
         r4 = 0xd7ad8740  r5 = 0xd70ce000
         r6 = 0xc052de24  r7 = 0x00000000
         r8 = 0xd87dae48  r9 = 0xd7ada3a0
        r10 = 0xc0824e8c
. . .

(extracted from the last of those messages).

bisect activity was used to isolate -r326347
as the version the problem started in.

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