Buildresult: linus/um-allmodconfig/um-x86_64-gcc12 built on Sep 3, 03:09

kisskb

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Status:	OK
Date/Time:	Sep 3, 03:09
Duration:	0:19:22.239031
Builder:	ka7
Revision:	mm/pagewalk: fix bootstopping regression from extra pte_unmap() (`ee40d543e97d23d3392d8fb1ec9972eb4e9c7611)`
Target:	linus/um-allmodconfig/um-x86_64-gcc12
Branch:	linus
Compiler:	um-x86_64-gcc12 (x86_64-linux-gcc.br_real (Buildroot 2021.11-4428-g6b6741b) 12.2.0 / GNU ld (GNU Binutils) 2.39)
Config:	allmodconfig (download)
Log:	Download original Possible warnings (4) .config:13843:warning: override: reassigning to symbol GCC_PLUGIN_LATENT_ENTROPY .config:13847:warning: override: reassigning to symbol UML_NET_ETHERTAP .config:13849:warning: override: reassigning to symbol UML_NET_SLIP .config:13854:warning: override: reassigning to symbol UML_NET_SLIRP Full Log # git rev-parse -q --verify ee40d543e97d23d3392d8fb1ec9972eb4e9c7611^{commit} ee40d543e97d23d3392d8fb1ec9972eb4e9c7611 already have revision, skipping fetch # git checkout -q -f -B kisskb ee40d543e97d23d3392d8fb1ec9972eb4e9c7611 # git clean -qxdf # < git log -1 # commit ee40d543e97d23d3392d8fb1ec9972eb4e9c7611 # Author: Hugh Dickins <hughd@google.com> # Date: Sat Sep 2 08:29:30 2023 -0700 # # mm/pagewalk: fix bootstopping regression from extra pte_unmap() # # Mikhail reports early-6.6-based Fedora Rawhide not booting: "rcu_preempt # detected expedited stalls", minutes wait, and then hung_task splat while # kworker trying to synchronize_rcu_expedited(). Nothing logged to disk. # # He bisected to my 6.6 a349d72fd9ef ("mm/pgtable: add rcu_read_lock() and # rcu_read_unlock()s"): but the one to blame is my 6.5 commit to fix the # espfix "bad pmd" warnings when booting x86_64 with CONFIG_EFI_PGT_DUMP=y. # # Gaah, that added an "addr >= TASK_SIZE" check to avoid pte_offset_map(), # but failed to add the equivalent check when choosing to pte_unmap(). # # It's not a problem on 6.5 (for different reasons, it's harmless on both # 64-bit and 32-bit), but becomes a bootstopper on 6.6 with the unbalanced # rcu_read_unlock() - RCU has a WARN_ON_ONCE for that, but it would have # scrolled off Mikhail's console too quickly. # # Reported-by: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com> # Closes: https://lore.kernel.org/linux-mm/CABXGCsNi8Tiv5zUPNXr6UJw6qV1VdaBEfGqEAMkkXE3QPvZuAQ@mail.gmail.com/ # Fixes: 8b1cb4a2e819 ("mm/pagewalk: fix EFI_PGT_DUMP of espfix area") # Fixes: a349d72fd9ef ("mm/pgtable: add rcu_read_lock() and rcu_read_unlock()s") # Signed-off-by: Hugh Dickins <hughd@google.com> # Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux-gcc --version # < /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux-ld --version # < git log --format=%s --max-count=1 ee40d543e97d23d3392d8fb1ec9972eb4e9c7611 # make -s -j 32 ARCH=um O=/kisskb/build/linus_allmodconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 allmodconfig # Added to kconfig CONFIG_STANDALONE=y # Added to kconfig CONFIG_KCOV=n # Added to kconfig CONFIG_GCC_PLUGINS=n # Added to kconfig CONFIG_GCC_PLUGIN_CYC_COMPLEXITY=n # Added to kconfig CONFIG_GCC_PLUGIN_SANCOV=n # Added to kconfig CONFIG_GCC_PLUGIN_LATENT_ENTROPY=n # Added to kconfig CONFIG_GCC_PLUGIN_STRUCTLEAK=n # Added to kconfig CONFIG_GCC_PLUGIN_RANDSTRUCT=n # Added to kconfig CONFIG_UML_NET=n # Added to kconfig CONFIG_UML_NET_ETHERTAP=n # Added to kconfig CONFIG_UML_NET_TUNTAP=n # Added to kconfig CONFIG_UML_NET_SLIP=n # Added to kconfig CONFIG_UML_NET_DAEMON=n # Added to kconfig CONFIG_UML_NET_VDE=n # Added to kconfig CONFIG_UML_NET_MCAST=n # Added to kconfig CONFIG_UML_NET_PCAP=n # Added to kconfig CONFIG_UML_NET_SLIRP=n # Added to kconfig CONFIG_GCOV_KERNEL=n # Added to kconfig CONFIG_DEBUG_INFO_BTF=n # Added to kconfig CONFIG_BPF_PRELOAD=n # Added to kconfig CONFIG_SPI_STM32_QSPI=n # < make -s -j 32 ARCH=um O=/kisskb/build/linus_allmodconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 help # make -s -j 32 ARCH=um O=/kisskb/build/linus_allmodconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 olddefconfig .config:13843:warning: override: reassigning to symbol GCC_PLUGIN_LATENT_ENTROPY .config:13847:warning: override: reassigning to symbol UML_NET_ETHERTAP .config:13849:warning: override: reassigning to symbol UML_NET_SLIP .config:13854:warning: override: reassigning to symbol UML_NET_SLIRP # make -s -j 32 ARCH=um O=/kisskb/build/linus_allmodconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 LINK linux Completed OK # rm -rf /kisskb/build/linus_allmodconfig_um-x86_64-gcc12 # Build took: 0:19:22.239031

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