Buildresult: powerpc-next-rand/powerpc-randconfig+ppc64le/powerpc-gcc5 built on Jul 20 2018, 01:57

kisskb

Revisions | Branches | Compilers | Configs | Build Results | Build Failures |

Status:	OK
Date/Time:	Jul 20 2018, 01:57
Duration:	0:01:57.251456
Builder:	ka3
Revision:	powerpc/mm: Don't report PUDs as memory leaks when using kmemleak (`2bc2026269beb0d7923317f5a4a28ce4d5bbc94c)`
Target:	powerpc-next-rand/powerpc-randconfig+ppc64le/powerpc-gcc5
Branch:	powerpc-next-rand
Compiler:	powerpc-gcc5 (powerpc64le-linux-gcc (GCC) 5.2.0)
Config:	randconfig+ppc64le (download)
Log:	Download original Possible warnings (3) WARNING: vmlinux.o(.text+0x295c): Section mismatch in reference from the variable __boot_from_prom to the function .init.text:prom_init() WARNING: vmlinux.o(.text+0x2b38): Section mismatch in reference from the variable start_here_multiplatform to the function .init.text:early_setup() WARNING: vmlinux.o(.text+0x2b6c): Section mismatch in reference from the variable start_here_common to the function .init.text:start_kernel() Full Log # git rev-parse -q --verify 2bc2026269beb0d7923317f5a4a28ce4d5bbc94c^{commit} 2bc2026269beb0d7923317f5a4a28ce4d5bbc94c already have revision, skipping fetch # git checkout -q -f -B kisskb 2bc2026269beb0d7923317f5a4a28ce4d5bbc94c # git clean -qxdf # < git log -1 # commit 2bc2026269beb0d7923317f5a4a28ce4d5bbc94c # Author: Michael Ellerman <mpe@ellerman.id.au> # Date: Thu Jul 19 23:36:10 2018 +1000 # # powerpc/mm: Don't report PUDs as memory leaks when using kmemleak # # Paul Menzel reported that kmemleak was producing reports such as: # # unreferenced object 0xc0000000f8b80000 (size 16384): # comm "init", pid 1, jiffies 4294937416 (age 312.240s) # hex dump (first 32 bytes): # 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ # 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ # backtrace: # [<00000000d997deb7>] __pud_alloc+0x80/0x190 # [<0000000087f2e8a3>] move_page_tables+0xbac/0xdc0 # [<00000000091e51c2>] shift_arg_pages+0xc0/0x210 # [<00000000ab88670c>] setup_arg_pages+0x22c/0x2a0 # [<0000000060871529>] load_elf_binary+0x41c/0x1648 # [<00000000ecd9d2d4>] search_binary_handler.part.11+0xbc/0x280 # [<0000000034e0cdd7>] __do_execve_file.isra.13+0x73c/0x940 # [<000000005f953a6e>] sys_execve+0x58/0x70 # [<000000009700a858>] system_call+0x5c/0x70 # # Indicating that a PUD was being leaked. # # However what's really happening is that kmemleak is not able to # recognise the references from the PGD to the PUD, because they are not # fully qualified pointers. # # We can confirm that in xmon, eg: # # Find the task struct for pid 1 "init": # 0:mon> P # task_struct ->thread.ksp PID PPID S P CMD # c0000001fe7c0000 c0000001fe803960 1 0 S 13 systemd # # Dump virtual address 0 to find the PGD: # 0:mon> dv 0 c0000001fe7c0000 # pgd @ 0xc0000000f8b01000 # # Dump the memory of the PGD: # 0:mon> d c0000000f8b01000 # c0000000f8b01000 00000000f8b90000 0000000000000000 \|................\| # c0000000f8b01010 0000000000000000 0000000000000000 \|................\| # c0000000f8b01020 0000000000000000 0000000000000000 \|................\| # c0000000f8b01030 0000000000000000 00000000f8b80000 \|................\| # ^^^^^^^^^^^^^^^^ # # There we can see the reference to our supposedly leaked PUD. But # because it's missing the leading 0xc, kmemleak won't recognise it. # # We can confirm it's still in use by translating an address that is # mapped via it: # 0:mon> dv 7fff94000000 c0000001fe7c0000 # pgd @ 0xc0000000f8b01000 # pgdp @ 0xc0000000f8b01038 = 0x00000000f8b80000 <-- # pudp @ 0xc0000000f8b81ff8 = 0x00000000037c4000 # pmdp @ 0xc0000000037c5ca0 = 0x00000000fbd89000 # ptep @ 0xc0000000fbd89000 = 0xc0800001d5ce0386 # Maps physical address = 0x00000001d5ce0000 # Flags = Accessed Dirty Read Write # # The fix is fairly simple. We need to tell kmemleak to ignore PUD # allocations and never report them as leaks. We can also tell it not to # scan the PGD, because it will never find pointers in there. However it # will still notice if we allocate a PGD and then leak it. # # Reported-by: Paul Menzel <pmenzel@molgen.mpg.de> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /opt/cross/kisskb/gcc-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux-gcc --version # < git log --format=%s --max-count=1 2bc2026269beb0d7923317f5a4a28ce4d5bbc94c # < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next-rand_randconfig+ppc64le_ppc64le CROSS_COMPILE=/opt/cross/kisskb/gcc-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux- randconfig KCONFIG_SEED=0x922DBABC # Added to kconfig CONFIG_STANDALONE=y # Added to kconfig CONFIG_BUILD_DOCSRC=n # Added to kconfig CONFIG_MODULE_SIG=n # Added to kconfig CONFIG_CPU_BIG_ENDIAN=n # Added to kconfig CONFIG_CPU_LITTLE_ENDIAN=y # Added to kconfig CONFIG_PPC64=y # Added to kconfig CONFIG_PPC_DISABLE_WERROR=y # Added to kconfig CONFIG_SECTION_MISMATCH_WARN_ONLY=y # Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y # Added to kconfig CONFIG_LD_HEAD_STUB_CATCH=y # Added to kconfig # Added to kconfig # yes \n \| make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next-rand_randconfig+ppc64le_ppc64le CROSS_COMPILE=/opt/cross/kisskb/gcc-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux- oldconfig yes: standard output: Broken pipe yes: write error # make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next-rand_randconfig+ppc64le_ppc64le CROSS_COMPILE=/opt/cross/kisskb/gcc-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux- /kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter. /kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter. WARNING: vmlinux.o(.text+0x295c): Section mismatch in reference from the variable __boot_from_prom to the function .init.text:prom_init() The function __boot_from_prom() references the function __init prom_init(). This is often because __boot_from_prom lacks a __init annotation or the annotation of prom_init is wrong. WARNING: vmlinux.o(.text+0x2b38): Section mismatch in reference from the variable start_here_multiplatform to the function .init.text:early_setup() The function start_here_multiplatform() references the function __init early_setup(). This is often because start_here_multiplatform lacks a __init annotation or the annotation of early_setup is wrong. WARNING: vmlinux.o(.text+0x2b6c): Section mismatch in reference from the variable start_here_common to the function .init.text:start_kernel() The function start_here_common() references the function __init start_kernel(). This is often because start_here_common lacks a __init annotation or the annotation of start_kernel is wrong. Completed OK # rm -rf /kisskb/build/powerpc-next-rand_randconfig+ppc64le_ppc64le # Build took: 0:01:57.251456

© Michael Ellerman 2006-2018.