Buildresult: powerpc-fixes/85xx/sbc8548_defconfig/powerpc-gcc4.6 built on Feb 16 2019, 21:44

kisskb

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Status:	OK
Date/Time:	Feb 16 2019, 21:44
Duration:	0:00:20.056222
Builder:	ka4
Revision:	powerpc/64s: Fix possible corruption on big endian due to pgd/pud_present() (`d9da4b51c27d706592a967c45c8525ed4e19bc6a)`
Target:	powerpc-fixes/85xx/sbc8548_defconfig/powerpc-gcc4.6
Branch:	powerpc-fixes
Compiler:	powerpc-gcc4.6 (powerpc-linux-gcc (GCC) 4.6.3 / GNU ld (GNU Binutils) 2.22)
Config:	85xx/sbc8548_defconfig (download)
Log:	Download original Possible warnings (3) kernel/printk/printk.c:186:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] drivers/tty/serial/8250/8250_core.c:247:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized] 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/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version # < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version # < git log --format=%s --max-count=1 d9da4b51c27d706592a967c45c8525ed4e19bc6a # < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_85xx_sbc8548_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- 85xx/sbc8548_defconfig # make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_85xx_sbc8548_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:186:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/proc/inode.c: In function 'proc_reg_open': /kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/proc/inode.c:339:21: note: 'pdeo' was declared here /kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq': /kisskb/src/drivers/tty/serial/8250/8250_core.c:247:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/tty/serial/8250/8250_core.c:227:19: note: 'i' was declared here INFO: Uncompressed kernel (size 0x45fd74) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x500000) INFO: Uncompressed kernel (size 0x44f6ec) 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 21:44:24 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2193103 Bytes = 2141.70 KiB = 2.09 MiB Load Address: 00000000 Entry Point: 00000000 Image Name: Linux-5.0.0-rc1-gd9da4b51c27d Created: Sat Feb 16 21:44:24 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2223121 Bytes = 2171.02 KiB = 2.12 MiB Load Address: 00500000 Entry Point: 005002a8 Completed OK # rm -rf /kisskb/build/powerpc-fixes_85xx_sbc8548_defconfig_powerpc-gcc4.6 # Build took: 0:00:20.056222

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