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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.=