Date: Fri, 7 Apr 2023 13:11:00 -0700 From: Mark Millard <marklmi@yahoo.com> To: John F Carr <jfc@mit.edu> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@FreeBSD.org>, Current FreeBSD <freebsd-current@freebsd.org> Subject: Re: Another VFP-in-kernel problem on armv8 Message-ID: <B31B2E5B-C21C-4A22-AE46-F1B0432DFBF7@yahoo.com> In-Reply-To: <911B8107-4FAC-4180-97D0-49B44212B788@mit.edu> References: <911B8107-4FAC-4180-97D0-49B44212B788@mit.edu>
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On Apr 7, 2023, at 06:06, John F Carr <jfc@mit.edu> wrote:
> I upgraded from mid-February CURRENT (5dc00f00b747) to yesterday =
(f02879f19925) and my system panics during boot with
>=20
> panic: VFP exception in the kernel
>=20
> Most likely this panic is while trying to import the root ZFS pool. =
The crash is at the first vector instruction in zfs_sha256_block_neon =
(in zfs.ko):
>=20
> f9284: 4cdf7020 ld1 { v0.16b }, [x1], #16
>=20
> This instruction is implemented on my CPU (Cortex A-57), confirmed by =
running it in user mode.
>=20
> I don't see any obviously related changes in ZFS since the last =
working kernel. What's going on recently with VFP in the kernel?
I've a simpler reproducer context based on just official
materials:
Downloaded and dd'd an 2023-Apr-06 snapshot image and
powered up a small aarch64 board with it:
. . .
FreeBSD 14.0-CURRENT #0 main-n262010-f21faa67ab6b: Thu Apr 6 11:49:31 =
UTC 2023
=
root@releng1.nyi.freebsd.org:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC =
arm64
FreeBSD clang version 15.0.7 (https://github.com/llvm/llvm-project.git =
llvmorg-15.0.7-0-g8dfdcc7b7bf6)
. . .
So: A just-UFS boot context. Then login and try "zpool import"
without having any zfs media present, just the UFS boot media:
Login: root
Password:
Apr 6 13:00:28 generic login[1443]: ROOT LOGIN (root) ON ttyu0
FreeBSD 14.0-CURRENT #0 main-n262010-f21faa67ab6b: Thu Apr 6 11:49:31 =
UTC 2023 =
root@releng1.nyi.freebsd.org:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC
Welcome to FreeBSD!
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Documents installed with the system are in the =
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directory, or can be installed later with: pkg install en-freebsd-doc
For other languages, replace "en" with a language code like de or fr.
Show the version of FreeBSD installed: freebsd-version ; uname -a
Please include that output and any error messages when posting =
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Introduction to manual pages: man man
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To change this login announcement, see motd(5).
root@generic:~ # zpool import
x0: ffff0000f0fa9168 (ucom_cons_softc + efbf1bb8)
x1: ffff0000ff900000 ($d.1 + afa318)
x2: ffff0000ff900400 ($d.1 + afa718)
x3: ffff0000fec1b0a4 (sha_incremental + 0)
x4: 0
x5: 100000
x6: 8e16db93
x7: 0
x8: ffff0000feb06168 (tf_sha256_neon + 0)
x9: ffff0000fea931fb ($d.1 + b)
x10: ffff0000feb045f4 (SHA2Update + f4)
x11: 29
x12: 1
x13: 0
x14: 0
x15: 2
x16: ffff0000feaf7500 ($d.0 + 0)
x17: ffff000000476cf0 (nanouptime + 0)
x18: ffff0000f0fa9000 (ucom_cons_softc + efbf1a50)
x19: ffff0000f0fa9168 (ucom_cons_softc + efbf1bb8)
x20: 400
x21: ffff0000ff900000 ($d.1 + afa318)
x22: ffff0000f0fa9198 (ucom_cons_softc + efbf1be8)
x23: 0
x24: 0
x25: 0
x26: ffff0000fed2df70 (sha256_neon_impl + 0)
x27: 203
x28: 31
x29: ffff0000f0fa9040 (ucom_cons_softc + efbf1a90)
sp: ffff0000f0fa9000
lr: ffff0000feb04668 (SHA2Update + 168)
elr: ffff0000feaf8684 (zfs_sha256_block_neon + 14)
spsr: 20000045
esr: 000000001fe00000
panic: VFP exception in the kernel
cpuid =3D 3
time =3D 1680786034
KDB: stack backtrace:
db_trace_self() at db_trace_self
db_trace_self_wrapper() at db_trace_self_wrapper+0x30
vpanic() at vpanic+0x13c
panic() at panic+0x44
do_el1h_sync() at do_el1h_sync+0x210
handle_el1h_sync() at handle_el1h_sync+0x10
--- exception, esr 0xffff0000f0fa9198
(null)() at 0x400
KDB: enter: panic
[ thread pid 1446 tid 100101 ]
Stopped at kdb_enter+0x44: undefined f905c27f
db>=20
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
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