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Date:      Thu, 14 Dec 2017 04:49:41 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-fs@FreeBSD.org
Subject:   [Bug 224080] ZFS: "arc_dnlc_evicts_thr" + "arc_reclaim_thread" - high CPU load during poudriere build...
Message-ID:  <bug-224080-3630-htPvRjB2Yj@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-224080-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-224080-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224080

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

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

--- Comment #37 from Mark Millard <markmi@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.ht=
ml

and ending with:

https://lists.freebsd.org/pipermail/freebsd-hackers/2017-December/051947.ht=
ml

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

. . .
uma_zcreate() at uma_zcreate+0x10c
         pc =3D 0xc052b024  lr =3D 0xc050cc90 (ffs_mount+0x80)
         sp =3D 0xd42a5858  fp =3D 0xd42a5980
         r4 =3D 0xd7844000  r5 =3D 0x00000000
         r6 =3D 0x00000003  r7 =3D 0xc09a99c0
         r8 =3D 0x00000000  r9 =3D 0xd429f000
        r10 =3D 0xd828c400
ffs_mount() at ffs_mount+0x80
         pc =3D 0xc050cc90  lr =3D 0xc032e1d4 (vfs_donmount+0xeec)
         sp =3D 0xd42a5988  fp =3D 0xd42a5b38
         r4 =3D 0xffffffff  r5 =3D 0xd74ec120
         r6 =3D 0xd429f000  r7 =3D 0x00000000
         r8 =3D 0x00000000  r9 =3D 0xc425acd0
        r10 =3D 0xd828c400
. . .

and the uma thread involving:

. . .
uma_reclaim_locked() at uma_reclaim_locked+0x200
         pc =3D 0xc052d9f8  lr =3D 0xc052de70 (uma_reclaim_worker+0x4c)
         sp =3D 0xd87dadf0  fp =3D 0xd87dae20
         r4 =3D 0xc09a9c68  r5 =3D 0xc4242d80
         r6 =3D 0xc06df86e  r7 =3D 0x00000000
         r8 =3D 0x00000100  r9 =3D 0xc09b3d08
        r10 =3D 0xc09a9c7c
uma_reclaim_worker() at uma_reclaim_worker+0x4c
         pc =3D 0xc052de70  lr =3D 0xc0230f10 (fork_exit+0xa0)
         sp =3D 0xd87dae28  fp =3D 0xd87dae40
         r4 =3D 0xd7ad8740  r5 =3D 0xd70ce000
         r6 =3D 0xc052de24  r7 =3D 0x00000000
         r8 =3D 0xd87dae48  r9 =3D 0xd7ada3a0
        r10 =3D 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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