Buildresult: powerpc-fixes/83xx/kmeter1_defconfig/powerpc-gcc5 built on Feb 16 2019, 22:22

kisskb

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Status:	OK
Date/Time:	Feb 16 2019, 22:22
Duration:	0:00:42.221827
Builder:	ka3
Revision:	powerpc/64s: Fix possible corruption on big endian due to pgd/pud_present() (`d9da4b51c27d706592a967c45c8525ed4e19bc6a)`
Target:	powerpc-fixes/83xx/kmeter1_defconfig/powerpc-gcc5
Branch:	powerpc-fixes
Compiler:	powerpc-gcc5 (powerpc64-linux-gcc (GCC) 5.5.0 / GNU ld (GNU Binutils) 2.29.1.20170915)
Config:	83xx/kmeter1_defconfig (download)
Log:	Download original No warnings found in log. Full Log # git rev-parse -q --verify d9da4b51c27d706592a967c45c8525ed4e19bc6a^{commit} d9da4b51c27d706592a967c45c8525ed4e19bc6a already have revision, skipping fetch # git checkout -q -f -B kisskb d9da4b51c27d706592a967c45c8525ed4e19bc6a # git clean -qxdf # < git log -1 # commit d9da4b51c27d706592a967c45c8525ed4e19bc6a # Author: Michael Ellerman <mpe@ellerman.id.au> # Date: Thu Feb 14 15:00:36 2019 +1100 # # powerpc/64s: Fix possible corruption on big endian due to pgd/pud_present() # # In v4.20 we changed our pgd/pud_present() to check for _PAGE_PRESENT # rather than just checking that the value is non-zero, e.g.: # # static inline int pgd_present(pgd_t pgd) # { # - return !pgd_none(pgd); # + return (pgd_raw(pgd) & cpu_to_be64(_PAGE_PRESENT)); # } # # Unfortunately this is broken on big endian, as the result of the # bitwise && is truncated to int, which is always zero because # _PAGE_PRESENT is 0x8000000000000000ul. This means pgd_present() and # pud_present() are always false at compile time, and the compiler # elides the subsequent code. # # Remarkably with that bug present we are still able to boot and run # with few noticeable effects. However under some work loads we are able # to trigger a warning in the ext4 code: # # WARNING: CPU: 11 PID: 29593 at fs/ext4/inode.c:3927 .ext4_set_page_dirty+0x70/0xb0 # CPU: 11 PID: 29593 Comm: debugedit Not tainted 4.20.0-rc1 #1 # ... # NIP .ext4_set_page_dirty+0x70/0xb0 # LR .set_page_dirty+0xa0/0x150 # Call Trace: # .set_page_dirty+0xa0/0x150 # .unmap_page_range+0xbf0/0xe10 # .unmap_vmas+0x84/0x130 # .unmap_region+0xe8/0x190 # .__do_munmap+0x2f0/0x510 # .__vm_munmap+0x80/0x110 # .__se_sys_munmap+0x14/0x30 # system_call+0x5c/0x70 # # The fix is simple, we need to convert the result of the bitwise && to # an int before returning it. # # Thanks to Erhard, Jan Kara and Aneesh for help with debugging. # # Fixes: da7ad366b497 ("powerpc/mm/book3s: Update pmd_present to look at _PAGE_PRESENT bit") # Cc: stable@vger.kernel.org # v4.20+ # Reported-by: Erhard F. <erhard_f@mailbox.org> # Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /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 d9da4b51c27d706592a967c45c8525ed4e19bc6a # < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_83xx_kmeter1_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- 83xx/kmeter1_defconfig # make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_83xx_kmeter1_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- INFO: Uncompressed kernel (size 0x4e4ef0) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x500000) Image Name: Linux-5.0.0-rc1-gd9da4b51c27d Created: Sat Feb 16 22:23:39 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2503289 Bytes = 2444.62 KiB = 2.39 MiB Load Address: 00000000 Entry Point: 00000000 Completed OK # rm -rf /kisskb/build/powerpc-fixes_83xx_kmeter1_defconfig_powerpc-gcc5 # Build took: 0:00:42.221827

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