Buildresult: powerpc-fixes/mpc86xx_defconfig/powerpc-gcc5 built on May 5 2022, 00:31

kisskb

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Status:	OK
Date/Time:	May 5 2022, 00:31
Duration:	0:02:00.782777
Builder:	blade46
Revision:	powerpc/vdso: Fix incorrect CFI in gettimeofday.S (`6d65028eb67dbb7627651adfc460d64196d38bd8)`
Target:	powerpc-fixes/mpc86xx_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:	mpc86xx_defconfig (download)
Log:	Download original Possible warnings (8) arch/powerpc/boot/dts/fsl/mvme7100.dts:135.22-137.4: Warning (pci_bridge): /pcie@f1008000: missing ranges for PCI bridge (or not a bridge) arch/powerpc/boot/dts/fsl/mpc8641si-post.dtsi:102.9-116.4: Warning (pci_bridge): /pcie@f1008000/pcie@0: missing ranges for PCI bridge (or not a bridge) arch/powerpc/boot/dts/fsl/mvme7100.dts:139.22-141.4: Warning (pci_bridge): /pcie@f1009000: missing ranges for PCI bridge (or not a bridge) arch/powerpc/boot/dts/fsl/mpc8641si-post.dtsi:129.9-143.4: Warning (pci_bridge): /pcie@f1009000/pcie@0: missing ranges for PCI bridge (or not a bridge) arch/powerpc/boot/dts/fsl/mvme7100.dtb: Warning (unit_address_format): Failed prerequisite 'pci_bridge' arch/powerpc/boot/dts/fsl/mvme7100.dtb: Warning (pci_device_reg): Failed prerequisite 'pci_bridge' arch/powerpc/boot/dts/fsl/mvme7100.dtb: Warning (pci_device_bus_num): Failed prerequisite 'pci_bridge' arch/powerpc/boot/dts/fsl/mvme7100.dts:30.11-32.6: Warning (i2c_bus_reg): /soc@f1000000/i2c@3000/rtc@68: missing or empty reg property Full Log # git rev-parse -q --verify 6d65028eb67dbb7627651adfc460d64196d38bd8^{commit} 6d65028eb67dbb7627651adfc460d64196d38bd8 already have revision, skipping fetch # git checkout -q -f -B kisskb 6d65028eb67dbb7627651adfc460d64196d38bd8 # git clean -qxdf # < git log -1 # commit 6d65028eb67dbb7627651adfc460d64196d38bd8 # Author: Michael Ellerman <mpe@ellerman.id.au> # Date: Mon May 2 22:50:10 2022 +1000 # # powerpc/vdso: Fix incorrect CFI in gettimeofday.S # # As reported by Alan, the CFI (Call Frame Information) in the VDSO time # routines is incorrect since commit ce7d8056e38b ("powerpc/vdso: Prepare # for switching VDSO to generic C implementation."). # # DWARF has a concept called the CFA (Canonical Frame Address), which on # powerpc is calculated as an offset from the stack pointer (r1). That # means when the stack pointer is changed there must be a corresponding # CFI directive to update the calculation of the CFA. # # The current code is missing those directives for the changes to r1, # which prevents gdb from being able to generate a backtrace from inside # VDSO functions, eg: # # Breakpoint 1, 0x00007ffff7f804dc in __kernel_clock_gettime () # (gdb) bt # #0 0x00007ffff7f804dc in __kernel_clock_gettime () # #1 0x00007ffff7d8872c in clock_gettime@@GLIBC_2.17 () from /lib64/libc.so.6 # #2 0x00007fffffffd960 in ?? () # #3 0x00007ffff7d8872c in clock_gettime@@GLIBC_2.17 () from /lib64/libc.so.6 # Backtrace stopped: frame did not save the PC # # Alan helpfully describes some rules for correctly maintaining the CFI information: # # 1) Every adjustment to the current frame address reg (ie. r1) must be # described, and exactly at the instruction where r1 changes. Why? # Because stack unwinding might want to access previous frames. # # 2) If a function changes LR or any non-volatile register, the save # location for those regs must be given. The CFI can be at any # instruction after the saves up to the point that the reg is # changed. # (Exception: LR save should be described before a bl. not after) # # 3) If asychronous unwind info is needed then restores of LR and # non-volatile regs must also be described. The CFI can be at any # instruction after the reg is restored up to the point where the # save location is (potentially) trashed. # # Fix the inability to backtrace by adding CFI directives describing the # changes to r1, ie. satisfying rule 1. # # Also change the information for LR to point to the copy saved on the # stack, not the value in r0 that will be overwritten by the function # call. # # Finally, add CFI directives describing the save/restore of r2. # # With the fix gdb can correctly back trace and navigate up and down the stack: # # Breakpoint 1, 0x00007ffff7f804dc in __kernel_clock_gettime () # (gdb) bt # #0 0x00007ffff7f804dc in __kernel_clock_gettime () # #1 0x00007ffff7d8872c in clock_gettime@@GLIBC_2.17 () from /lib64/libc.so.6 # #2 0x0000000100015b60 in gettime () # #3 0x000000010000c8bc in print_long_format () # #4 0x000000010000d180 in print_current_files () # #5 0x00000001000054ac in main () # (gdb) up # #1 0x00007ffff7d8872c in clock_gettime@@GLIBC_2.17 () from /lib64/libc.so.6 # (gdb) # #2 0x0000000100015b60 in gettime () # (gdb) # #3 0x000000010000c8bc in print_long_format () # (gdb) # #4 0x000000010000d180 in print_current_files () # (gdb) # #5 0x00000001000054ac in main () # (gdb) # Initial frame selected; you cannot go up. # (gdb) down # #4 0x000000010000d180 in print_current_files () # (gdb) # #3 0x000000010000c8bc in print_long_format () # (gdb) # #2 0x0000000100015b60 in gettime () # (gdb) # #1 0x00007ffff7d8872c in clock_gettime@@GLIBC_2.17 () from /lib64/libc.so.6 # (gdb) # #0 0x00007ffff7f804dc in __kernel_clock_gettime () # (gdb) # # Fixes: ce7d8056e38b ("powerpc/vdso: Prepare for switching VDSO to generic C implementation.") # Cc: stable@vger.kernel.org # v5.11+ # Reported-by: Alan Modra <amodra@gmail.com> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org> # Link: https://lore.kernel.org/r/20220502125010.1319370-1-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 6d65028eb67dbb7627651adfc460d64196d38bd8 # < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc86xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- mpc86xx_defconfig # < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc86xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc86xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc86xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- /kisskb/src/arch/powerpc/boot/dts/fsl/mvme7100.dts:135.22-137.4: Warning (pci_bridge): /pcie@f1008000: missing ranges for PCI bridge (or not a bridge) also defined at /kisskb/src/arch/powerpc/boot/dts/fsl/mpc8641si-post.dtsi:92.7-117.3 /kisskb/src/arch/powerpc/boot/dts/fsl/mpc8641si-post.dtsi:102.9-116.4: Warning (pci_bridge): /pcie@f1008000/pcie@0: missing ranges for PCI bridge (or not a bridge) /kisskb/src/arch/powerpc/boot/dts/fsl/mvme7100.dts:139.22-141.4: Warning (pci_bridge): /pcie@f1009000: missing ranges for PCI bridge (or not a bridge) also defined at /kisskb/src/arch/powerpc/boot/dts/fsl/mpc8641si-post.dtsi:119.7-144.3 /kisskb/src/arch/powerpc/boot/dts/fsl/mpc8641si-post.dtsi:129.9-143.4: Warning (pci_bridge): /pcie@f1009000/pcie@0: missing ranges for PCI bridge (or not a bridge) arch/powerpc/boot/dts/fsl/mvme7100.dtb: Warning (unit_address_format): Failed prerequisite 'pci_bridge' arch/powerpc/boot/dts/fsl/mvme7100.dtb: Warning (pci_device_reg): Failed prerequisite 'pci_bridge' arch/powerpc/boot/dts/fsl/mvme7100.dtb: Warning (pci_device_bus_num): Failed prerequisite 'pci_bridge' /kisskb/src/arch/powerpc/boot/dts/fsl/mvme7100.dts:30.11-32.6: Warning (i2c_bus_reg): /soc@f1000000/i2c@3000/rtc@68: missing or empty reg property Completed OK # rm -rf /kisskb/build/powerpc-fixes_mpc86xx_defconfig_powerpc-gcc5 # Build took: 0:02:00.782777

© Michael Ellerman 2006-2018.