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Tue, 17 Feb 2026 03:30:42 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 292959] spontaneous ufs errors inside vm Date: Tue, 17 Feb 2026 03:30:42 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 14.3-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: linimon@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: virtualization@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: assigned_to Message-ID: In-Reply-To: References: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Discussion List-Archive: https://lists.freebsd.org/archives/freebsd-virtualization List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-virtualization@freebsd.org Sender: owner-freebsd-virtualization@FreeBSD.org MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D292959 Mark Linimon changed: What |Removed |Added ---------------------------------------------------------------------------- Assignee|bugs@FreeBSD.org |virtualization@FreeBSD.org --=20 You are receiving this mail because: You are the assignee for the bug.= From nobody Thu Feb 19 15:20:40 2026 X-Original-To: virtualization@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4fGxsP0fB2z6RRWQ for ; 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Thu, 19 Feb 2026 15:20:40 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 61JFKebh026335 for ; Thu, 19 Feb 2026 15:20:40 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 61JFKexC026334 for virtualization@FreeBSD.org; Thu, 19 Feb 2026 15:20:40 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 285853] hv_hid: kernel built with -O0 panics in hv_hid_probe() Date: Thu, 19 Feb 2026 15:20:40 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 15.0-CURRENT X-Bugzilla-Keywords: crash X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: zlei@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: virtualization@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc Message-ID: In-Reply-To: References: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Discussion List-Archive: https://lists.freebsd.org/archives/freebsd-virtualization List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-virtualization@freebsd.org Sender: owner-freebsd-virtualization@FreeBSD.org MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D285853 Zhenlei Huang changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |zlei@FreeBSD.org --- Comment #2 from Zhenlei Huang --- (In reply to Lexi Winter from comment #0) > (kgdb) disass hv_hid_probe > Dump of assembler code for function hv_hid_probe: > 0xffffffff83d11000 <+0>: add %al,(%rax) > 0xffffffff83d11002 <+2>: add %al,(%rax) > 0xffffffff83d11004 <+4>: add %al,(%rax) > 0xffffffff83d11006 <+6>: add %al,(%rax) > 0xffffffff83d11008 <+8>: add %al,(%rax) > 0xffffffff83d1100a <+10>: add %al,(%rax) Those disassembly looks weird to me. In x86_64 ABI, the rax register is use= d to stash a return value. Typically a start of a function, say `hv_hid_probe()`= in this case, would like to save registers but not firstly operate on rax. The rax, > rax: ffffffff83d11000 rbx: 000019e97c87cf20 rbp: fffffe0092594790 is the address of the function hv_hid_probe(), but `add %al,(%rax)` want= s to write 1 byte to (%rax) which is absolutely wrong to me. On loading a module, the linker will set write protecting for .text section, hence you got > fault code =3D supervisor write data, protection violation which is a runtime exception. My local kernel config is almost identical with yours, ``` zlei@:~/freebsd-src-releng-15.0 % cat sys/amd64/conf/GENERIC-NOOPT # # GENERIC-NOOPT -- disable compiler optimize # include GENERIC ident GENERIC-NOOPT makeoptions COPTFLAGS=3D"-O0 -fno-strict-aliasing" options KSTACK_PAGES=3D20 ``` And the disassembly looks good to me, ``` zlei@:~ % objdump --disassemble-symbols=3Dhv_hid_probe /usr/obj/usr/home/zlei/freebsd-src-releng-15.0/amd64.amd64/sys/GENERIC-NOOP= T/modules/usr/home/zlei/freebsd-src-releng-15.0/sys/modules/hyperv/hid/hv_h= id.ko /usr/obj/usr/home/zlei/freebsd-src-releng-15.0/amd64.amd64/sys/GENERIC-NOOP= T/modules/usr/home/zlei/freebsd-src-releng-15.0/sys/modules/hyperv/hid/hv_h= id.ko: file format elf64-x86-64 Disassembly of section .text: 0000000000000000 : 0: 55 pushq %rbp 1: 48 89 e5 movq %rsp, %rbp 4: 41 57 pushq %r15 6: 41 56 pushq %r14 8: 53 pushq %rbx 9: 50 pushq %rax a: 48 89 fb movq %rdi, %rbx d: e8 00 00 00 00 callq 0x12 12: 48 89 c7 movq %rax, %rdi 15: 31 f6 xorl %esi, %esi 17: e8 00 00 00 00 callq 0x1c 1c: 41 be 06 00 00 00 movl $0x6, %r14d 22: 85 c0 testl %eax, %eax 24: 75 62 jne 0x88 26: 48 89 df movq %rbx, %rdi 29: e8 00 00 00 00 callq 0x2e 2e: 49 89 c7 movq %rax, %r15 31: 48 8b 08 movq (%rax), %rcx 34: 0f b6 15 00 00 00 00 movzbl (%rip), %edx # 0= x3b 3b: 48 8b 04 d1 movq (%rcx,%rdx,8), %rax 3f: 48 81 38 00 00 00 00 cmpq $0x0, (%rax) 46: 74 17 je 0x5f 48: 48 8d 34 d1 leaq (%rcx,%rdx,8), %rsi 4c: 48 8b b9 00 08 00 00 movq 0x800(%rcx), %rdi 53: 48 c7 c2 00 00 00 00 movq $0x0, %rdx 5a: e8 00 00 00 00 callq 0x5f 5f: 4c 89 ff movq %r15, %rdi 62: 48 89 de movq %rbx, %rsi 65: 48 c7 c2 00 00 00 00 movq $0x0, %rdx 6c: ff 50 08 callq *0x8(%rax) 6f: 85 c0 testl %eax, %eax 71: 75 15 jne 0x88 73: 48 89 df movq %rbx, %rdi 76: 48 c7 c6 00 00 00 00 movq $0x0, %rsi 7d: e8 00 00 00 00 callq 0x82 82: 41 be ec ff ff ff movl $0xffffffec, %r14d # i= mm =3D 0xFFFFFFEC 88: 44 89 f0 movl %r14d, %eax 8b: 48 83 c4 08 addq $0x8, %rsp 8f: 5b popq %rbx 90: 41 5e popq %r14 92: 41 5f popq %r15 94: 5d popq %rbp 95: c3 retq 96: 66 2e 0f 1f 84 00 00 00 00 00 nopw %cs:(%rax,%rax) ``` Can you please also check the disassembly of the module hv_hid.ko ? --=20 You are receiving this mail because: You are the assignee for the bug.= From nobody Thu Feb 19 15:40:02 2026 X-Original-To: virtualization@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4fGyHk53STz6RTGx for ; 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Thu, 19 Feb 2026 15:40:02 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 61JFe2wY055767 for ; Thu, 19 Feb 2026 15:40:02 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 61JFe2ON055766 for virtualization@FreeBSD.org; Thu, 19 Feb 2026 15:40:02 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 285853] hv_hid: kernel built with -O0 panics in hv_hid_probe() Date: Thu, 19 Feb 2026 15:40:02 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 15.0-CURRENT X-Bugzilla-Keywords: crash X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: zlei@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: virtualization@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc Message-ID: In-Reply-To: References: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Discussion List-Archive: https://lists.freebsd.org/archives/freebsd-virtualization List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-virtualization@freebsd.org Sender: owner-freebsd-virtualization@FreeBSD.org MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D285853 Zhenlei Huang changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |kib@FreeBSD.org --- Comment #3 from Zhenlei Huang --- (In reply to Lexi Winter from comment #0) Some interesting finding. In x86-64 `00 00` is disassembled to `add=20=20=20 %al,(%rax)`. So probably=20 > (kgdb) disass hv_hid_probe > Dump of assembler code for function hv_hid_probe: > 0xffffffff83d11000 <+0>: add %al,(%rax) > 0xffffffff83d11002 <+2>: add %al,(%rax) > 0xffffffff83d11004 <+4>: add %al,(%rax) > 0xffffffff83d11006 <+6>: add %al,(%rax) > 0xffffffff83d11008 <+8>: add %al,(%rax) > 0xffffffff83d1100a <+10>: add %al,(%rax) > 0xffffffff83d1100c <+12>: add %al,(%rax) > 0xffffffff83d1100e <+14>: (bad) > 0xffffffff83d1100f <+15>: loopne 0xffffffff83d11038 hints a block of the address 0xffffffff83d11000 is filled with zeroes ? Emm, is it possible the CPU instruction cache is not flushed on loading the hv_hid.ko module ?=20 CC Konstantin for better insights on that. --=20 You are receiving this mail because: You are the assignee for the bug.= From nobody Fri Feb 20 14:47:42 2026 X-Original-To: virtualization@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4fHY4v0T3pz6SS8Q for ; Fri, 20 Feb 2026 14:47:43 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R12" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4fHY4t6tJlz3Wnd for ; Fri, 20 Feb 2026 14:47:42 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) DKIM-Signature: v=1; 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Fri, 20 Feb 2026 14:47:42 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 61KElgN0040621 for ; Fri, 20 Feb 2026 14:47:42 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 61KElgW1040620 for virtualization@FreeBSD.org; Fri, 20 Feb 2026 14:47:42 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 291063] bhyve: Failed to emulate instruction sequence 8908f0091c244883c2044883c00441 Date: Fri, 20 Feb 2026 14:47:42 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: bhyve X-Bugzilla-Version: 14.3-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: emaste@freebsd.org X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: virtualization@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_status resolution Message-ID: In-Reply-To: References: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Discussion List-Archive: https://lists.freebsd.org/archives/freebsd-virtualization List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-virtualization@freebsd.org Sender: owner-freebsd-virtualization@FreeBSD.org MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D291063 Ed Maste changed: What |Removed |Added ---------------------------------------------------------------------------- Status|Closed |Open Resolution|Not Accepted |--- --- Comment #2 from Ed Maste --- Not yet resolved. It looks like there's no support for the lock prefix (0xF= 0). I had a quick look at Illumos and did not see it there, either. --=20 You are receiving this mail because: You are the assignee for the bug.= From nobody Sun Feb 22 01:44:30 2026 X-Original-To: virtualization@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4fJRcH0m3zz6Sgrg for ; Sun, 22 Feb 2026 01:44:31 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R12" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4fJRcH0Jl7z44Yt for ; Sun, 22 Feb 2026 01:44:31 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; 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Sun, 22 Feb 2026 01:44:30 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 61M1iUFK051954 for ; Sun, 22 Feb 2026 01:44:30 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 61M1iUcV051953 for virtualization@FreeBSD.org; Sun, 22 Feb 2026 01:44:30 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 285853] hv_hid: kernel built with -O0 panics in hv_hid_probe() Date: Sun, 22 Feb 2026 01:44:30 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 15.0-CURRENT X-Bugzilla-Keywords: crash X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: ivy@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: virtualization@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Discussion List-Archive: https://lists.freebsd.org/archives/freebsd-virtualization List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-virtualization@freebsd.org Sender: owner-freebsd-virtualization@FreeBSD.org MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D285853 --- Comment #4 from Lexi Winter --- i don't use Hyper-V anymore, but i'll see if i can find a way to test this = on main and see if the issue is still present.=20=20 to be clear, in my case the problem only occurred with -O0, a normal build wasn't affected. the backtrace of Titus looks a bit different since it does= n't reach hv_hid_probe() (unless this is an optimiser artefact). --=20 You are receiving this mail because: You are the assignee for the bug.= From nobody Sun Feb 22 21:00:26 2026 X-Original-To: virtualization@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4fJxG31mWqz6S2Gt for ; 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Sun, 22 Feb 2026 21:00:26 +0000 (UTC) (envelope-from bugzilla-noreply@FreeBSD.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 61ML0QSi026425 for ; Sun, 22 Feb 2026 21:00:26 GMT (envelope-from bugzilla-noreply@FreeBSD.org) Received: (from bugzilla@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 61ML0QVD026424 for virtualization@FreeBSD.org; Sun, 22 Feb 2026 21:00:26 GMT (envelope-from bugzilla-noreply@FreeBSD.org) Message-Id: <202602222100.61ML0QVD026424@kenobi.freebsd.org> X-Authentication-Warning: kenobi.freebsd.org: bugzilla set sender to bugzilla-noreply@FreeBSD.org using -f From: bugzilla-noreply@FreeBSD.org To: virtualization@FreeBSD.org Subject: Problem reports for virtualization@FreeBSD.org that need special attention Date: Sun, 22 Feb 2026 21:00:26 +0000 List-Id: Discussion List-Archive: https://lists.freebsd.org/archives/freebsd-virtualization List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-virtualization@freebsd.org Sender: owner-freebsd-virtualization@FreeBSD.org MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="17717940262.8285A.23780" Content-Transfer-Encoding: 7bit --17717940262.8285A.23780 Date: Sun, 22 Feb 2026 21:00:26 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" To view an individual PR, use: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=(Bug Id). The following is a listing of current problems submitted by FreeBSD users, which need special attention. These represent problem reports covering all versions including experimental development code and obsolete releases. Status | Bug Id | Description ------------+-----------+--------------------------------------------------- New | 289848 | Enable by default BHYVE_SNAPSHOT 1 problems total for which you should take action. --17717940262.8285A.23780 Date: Sun, 22 Feb 2026 21:00:26 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" 
The following is a listing of current problems submitted by FreeBSD users,
which need special attention. These represent problem reports covering
all versions including experimental development code and obsolete releases.

Status      |    Bug Id | Description
------------+-----------+---------------------------------------------------
New         |    289848 | Enable by default BHYVE_SNAPSHOT

1 problems total for which you should take action.
--17717940262.8285A.23780--