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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id x18-20020aa79ad2000000b0056bfd387c97sm3069430pfp.39.2022.10.28.09.41.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Oct 2022 09:41:38 -0700 (PDT) Date: Fri, 28 Oct 2022 09:41:37 -0700 From: Kees Cook To: "Sudip Mukherjee (Codethink)" Cc: Peter Zijlstra , Dave Hansen , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Andy Lutomirski , linux-kernel@vger.kernel.org, linux-next@vger.kernel.org Subject: Re: boot failure of linux-next due to 1248fb6a8201 ("x86/mm: Randomize per-cpu entry area") Message-ID: <202210280940.D7A7330@keescook> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-next@vger.kernel.org On Fri, Oct 28, 2022 at 02:29:14PM +0100, Sudip Mukherjee (Codethink) wrote: > Hi All, > > Our qemu boots were failing since next-20221024, and a git bisect of > next-20221028 showed the bad commit as 1248fb6a8201 ("x86/mm: Randomize per-cpu entry area") > > After reverting the commit I could boot qemu again with next-20221028. > > This is my config: > > make defconfig > make kvm_guest.config > scripts/config -e KCOV -e KCOV_INSTRUMENT_ALL -e KCOV_ENABLE_COMPARISONS -e DEBUG_FS -e DEBUG_KMEMLEAK -e DEBUG_INFO -e KALLSYMS -e KALLSYMS_ALL -e NAMESPACES -e UTS_NS -e IPC_NS -e PID_NS -e NET_NS -e CGROUP_PIDS -e MEMCG -e USER_NS -e CONFIGFS_FS -e SECURITYFS -e KASAN -e KASAN_INLINE -e FAULT_INJECTION -e FAULT_INJECTION_DEBUG_FS -e FAULT_INJECTION_USERCOPY -e FAILSLAB -e FAIL_PAGE_ALLOC -e FAIL_MAKE_REQUEST -e FAIL_IO_TIMEOUT -e FAIL_FUTEX -e LOCKDEP -e PROVE_LOCKING -e DEBUG_ATOMIC_SLEEP -e PROVE_RCU -e DEBUG_VM -e REFCOUNT_FULL -e FORTIFY_SOURCE -e HARDENED_USERCOPY -e LOCKUP_DETECTOR -e SOFTLOCKUP_DETECTOR -e HARDLOCKUP_DETECTOR -e BOOTPARAM_HARDLOCKUP_PANIC -e DETECT_HUNG_TASK -e WQ_WATCHDOG -e USB_GADGET -e USB_RAW_GADGET -e TUN -e KCSAN -d RANDOMIZE_BASE -e MAC80211_HWSIM -e IEEE802154 -e MAC802154 -e IEEE802154_DRIVERS -e IEEE802154_HWSIM -e BT -e BT_HCIVHCI > echo "CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=140" >> .config > echo "CONFIG_RCU_CPU_STALL_TIMEOUT=100" >> .config > > I will be happy to test any patch or provide any extra log if needed. > Though I am not sure how I will collect extra logs (if needed) as there > was no output from qemu. I see KASAN in your config, does this fix it? https://lore.kernel.org/lkml/166693938482.29415.7034851115705424459.tip-bot2@tip-bot2/ -- Kees Cook