# git rev-parse -q --verify ae085d7f9365de7da27ab5c0d16b12d51ea7fca9^{commit}
ae085d7f9365de7da27ab5c0d16b12d51ea7fca9
already have revision, skipping fetch
# git checkout -q -f -B kisskb ae085d7f9365de7da27ab5c0d16b12d51ea7fca9
# git clean -qxdf
# < git log -1
# commit ae085d7f9365de7da27ab5c0d16b12d51ea7fca9
# Author: Muchun Song <songmuchun@bytedance.com>
# Date:   Sun Mar 27 13:18:52 2022 +0800
# 
#     mm: kfence: fix missing objcg housekeeping for SLAB
#     
#     The objcg is not cleared and put for kfence object when it is freed,
#     which could lead to memory leak for struct obj_cgroup and wrong
#     statistics of NR_SLAB_RECLAIMABLE_B or NR_SLAB_UNRECLAIMABLE_B.
#     
#     Since the last freed object's objcg is not cleared,
#     mem_cgroup_from_obj() could return the wrong memcg when this kfence
#     object, which is not charged to any objcgs, is reallocated to other
#     users.
#     
#     A real word issue [1] is caused by this bug.
#     
#     Link: https://lore.kernel.org/all/000000000000cabcb505dae9e577@google.com/ [1]
#     Reported-by: syzbot+f8c45ccc7d5d45fc5965@syzkaller.appspotmail.com
#     Fixes: d3fb45f370d9 ("mm, kfence: insert KFENCE hooks for SLAB")
#     Signed-off-by: Muchun Song <songmuchun@bytedance.com>
#     Cc: Dmitry Vyukov <dvyukov@google.com>
#     Cc: Marco Elver <elver@google.com>
#     Cc: Andrew Morton <akpm@linux-foundation.org>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 ae085d7f9365de7da27ab5c0d16b12d51ea7fca9
# < make -s -j 120 ARCH=powerpc O=/kisskb/build/linus_ppc44x_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ppc44x_defconfig
# < make -s -j 120 ARCH=powerpc O=/kisskb/build/linus_ppc44x_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 120 ARCH=powerpc O=/kisskb/build/linus_ppc44x_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 120 ARCH=powerpc O=/kisskb/build/linus_ppc44x_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/linus_ppc44x_defconfig_powerpc-gcc5
# Build took: 0:00:26.528359