Date: Thu, 06 Aug 2026 18:04:21 +0000 From: bugzilla-noreply@freebsd.org To: ppc@FreeBSD.org Subject: [Bug 294369] powerpc64: panic in zfs_write() during buildworld Message-ID: <bug-294369-21-01LmQ3cLjN@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-294369-21@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294369 --- Comment #6 from commit-hook@FreeBSD.org --- A commit in branch stable/15 references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=310a5a993ac8ffba2edcdb8152688620c2f5e56f commit 310a5a993ac8ffba2edcdb8152688620c2f5e56f Author: Jessica Clarke <jrtc27@FreeBSD.org> AuthorDate: 2026-07-27 16:54:04 +0000 Commit: Jessica Clarke <jrtc27@FreeBSD.org> CommitDate: 2026-08-06 18:02:32 +0000 Merge commit 26bf39cdba0b from llvm-project (by Jessica Clarke): [ELF][PowerPC] Don't assume TOC pointer is valid in IPLT entries (#207555) Unlike normal PLT entries, IPLT entries can be called indirectly even when in PIEs/DSOs, and so there's no guarantee on what's in the TOC pointer register at that time. Therefore we must emit variants of the existing code that work without it, whether r12-relative (playing the same role as MIPS's $25) in the same number of instructions, or first retrieving PC in an i386-like manner, being careful not to clobber LR. On 32-bit PowerPC even direct calls to IPLT entries face the same issue, since we'd use the TOC base of the resolver, which may not be the same as the caller, even within the same object. Normal canonical PLTs still look broken on 64-bit PowerPC as they use the TOC pointer register too, and similarly on 32-bit PowerPC for PIEs. We should probably treat these cases the same as PIE on i386 (except including PDEs for 64-bit PowerPC), where it's an error due to the use of %ebx in PLT entries. Bump LLD_FREEBSD_VERSION for this fix as otherwise an existing system linker will be deemed new enough to use and produce broken kernels for TARGET=powerpc (regardless of TARGET_ARCH/MACHINE/MACHINE_ARCH) builds. PR: 294369 MFC after: 1 week (cherry picked from commit b68f2fe1932cbc9809245e2c5a2db2bc0944cc5d) contrib/llvm-project/lld/ELF/Arch/PPC.cpp | 13 +++--- contrib/llvm-project/lld/ELF/Arch/PPC64.cpp | 5 ++- contrib/llvm-project/lld/ELF/Thunks.cpp | 69 +++++++++++++++++++++-------- contrib/llvm-project/lld/ELF/Thunks.h | 9 ++-- lib/clang/include/lld/Common/Version.inc | 2 +- 5 files changed, 67 insertions(+), 31 deletions(-) -- You are receiving this mail because: You are on the CC list for the bug.home | help
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