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! Release Notes, Errata: https://www.FreeBSD.org/releases/ Security Advisories: https://www.FreeBSD.org/security/ FreeBSD Handbook: https://www.FreeBSD.org/handbook/ FreeBSD FAQ: https://www.FreeBSD.org/faq/ Questions List: https://www.FreeBSD.org/lists/questions/ FreeBSD Forums: https://forums.FreeBSD.org/ Documents installed with the system are in the = /usr/local/share/doc/freebsd/ 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 = questions. Introduction to manual pages: man man FreeBSD directory layout: man hier 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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