Buildresult: powerpc-next/m68k-defconfig/m68k-gcc8 built on Jul 20 2018, 00:41

kisskb

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Status:	OK
Date/Time:	Jul 20 2018, 00:41
Duration:	0:04:19.770744
Builder:	ka1
Revision:	powerpc/mm: Don't report PUDs as memory leaks when using kmemleak (`2bc2026269beb0d7923317f5a4a28ce4d5bbc94c)`
Target:	powerpc-next/m68k-defconfig/m68k-gcc8
Branch:	powerpc-next
Compiler:	m68k-gcc8 (m68k-linux-gcc (GCC) 4.6.3)
Config:	defconfig (download)
Log:	Download original Possible warnings (30) <stdin>:1239:2: warning: #warning syscall seccomp not implemented [-Wcpp] <stdin>:1317:2: warning: #warning syscall pkey_mprotect not implemented [-Wcpp] <stdin>:1320:2: warning: #warning syscall pkey_alloc not implemented [-Wcpp] <stdin>:1323:2: warning: #warning syscall pkey_free not implemented [-Wcpp] <stdin>:1332:2: warning: #warning syscall io_pgetevents not implemented [-Wcpp] <stdin>:1335:2: warning: #warning syscall rseq not implemented [-Wcpp] arch/m68k/mvme147/config.c:152:2: warning: #warning check me! [-Wcpp] arch/m68k/mvme16x/config.c:399:2: warning: #warning check me! [-Wcpp] ipc/shm.c:1648:59: warning: 'file' may be used uninitialized in this function [-Wuninitialized] lib/mpi/mpicoder.c:336:12: warning: 'buff' may be used uninitialized in this function [-Wuninitialized] kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] lib/rhashtable.c:269:2: warning: 'next' may be used uninitialized in this function [-Wuninitialized] drivers/net/macsec.c:1926:2: warning: 'assoc_num' may be used uninitialized in this function [-Wuninitialized] drivers/net/macsec.c:1926:2: warning: 'rx_sc' may be used uninitialized in this function [-Wuninitialized] drivers/net/macsec.c:2003:2: warning: 'assoc_num' may be used uninitialized in this function [-Wuninitialized] drivers/net/macsec.c:2003:2: warning: 'tx_sc' may be used uninitialized in this function [-Wuninitialized] drivers/net/macsec.c:2068:5: warning: 'assoc_num' may be used uninitialized in this function [-Wuninitialized] drivers/net/macsec.c:2068:24: warning: 'tx_sc' may be used uninitialized in this function [-Wuninitialized] drivers/net/macsec.c:2069:21: warning: 'secy' may be used uninitialized in this function [-Wuninitialized] drivers/net/tun.c:1835:30: warning: 'copylen' may be used uninitialized in this function [-Wuninitialized] drivers/net/tun.c:1545:31: warning: 'linear' may be used uninitialized in this function [-Wuninitialized] kernel/acct.c:177:2: warning: value computed is not used [-Wunused-value] include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] fs/udf/unicode.c:132:8: warning: 'c' may be used uninitialized in this function [-Wuninitialized] fs/ocfs2/file.c:2386:3: warning: value computed is not used [-Wunused-value] fs/posix_acl.c:147:3: warning: value computed is not used [-Wunused-value] net/core/gen_stats.c:149:19: warning: 'seq' may be used uninitialized in this function [-Wuninitialized] net/core/flow_dissector.c:789:7: warning: 'vlan' may be used uninitialized in this function [-Wuninitialized] net/core/dev.c:3161:15: warning: 'tail' may be used uninitialized in this function [-Wuninitialized] include/net/sock.h:1863:19: warning: 'sk' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify 2bc2026269beb0d7923317f5a4a28ce4d5bbc94c^{commit} # git fetch -q -n -f git://gitlab.ozlabs.ibm.com/linuxppc/linux.git next-test # git rev-parse -q --verify 2bc2026269beb0d7923317f5a4a28ce4d5bbc94c^{commit} 2bc2026269beb0d7923317f5a4a28ce4d5bbc94c # 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-4.6.3-nolibc/m68k-linux/bin/m68k-linux-gcc --version # < git log --format=%s --max-count=1 2bc2026269beb0d7923317f5a4a28ce4d5bbc94c # < make -s -j 48 ARCH=m68k O=/kisskb/build/powerpc-next_m68k-defconfig_m68k CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/m68k-linux/bin/m68k-linux- defconfig # make -s -j 48 ARCH=m68k O=/kisskb/build/powerpc-next_m68k-defconfig_m68k CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/m68k-linux/bin/m68k-linux- /kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter. <stdin>:1239:2: warning: #warning syscall seccomp not implemented [-Wcpp] <stdin>:1317:2: warning: #warning syscall pkey_mprotect not implemented [-Wcpp] <stdin>:1320:2: warning: #warning syscall pkey_alloc not implemented [-Wcpp] <stdin>:1323:2: warning: #warning syscall pkey_free not implemented [-Wcpp] <stdin>:1332:2: warning: #warning syscall io_pgetevents not implemented [-Wcpp] <stdin>:1335:2: warning: #warning syscall rseq not implemented [-Wcpp] /kisskb/src/arch/m68k/mvme147/config.c: In function 'mvme147_hwclk': /kisskb/src/arch/m68k/mvme147/config.c:152:2: warning: #warning check me! [-Wcpp] /kisskb/src/arch/m68k/mvme16x/config.c: In function 'mvme16x_hwclk': /kisskb/src/arch/m68k/mvme16x/config.c:399:2: warning: #warning check me! [-Wcpp] /kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter. /kisskb/src/ipc/shm.c: In function 'ksys_shmdt': /kisskb/src/ipc/shm.c:1648:59: warning: 'file' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/lib/mpi/mpicoder.c: In function 'mpi_read_raw_from_sgl': /kisskb/src/lib/mpi/mpicoder.c:336:12: warning: 'buff' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/lib/rhashtable.c: In function 'rht_deferred_worker': /kisskb/src/lib/rhashtable.c:269:2: warning: 'next' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/lib/rhashtable.c:234:28: note: 'next' was declared here /kisskb/src/drivers/net/macsec.c: In function 'macsec_del_rxsa': /kisskb/src/drivers/net/macsec.c:1926:2: warning: 'assoc_num' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/net/macsec.c:1926:2: warning: 'rx_sc' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/net/macsec.c: In function 'macsec_del_txsa': /kisskb/src/drivers/net/macsec.c:2003:2: warning: 'assoc_num' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/net/macsec.c:2003:2: warning: 'tx_sc' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/net/macsec.c: In function 'macsec_upd_txsa': /kisskb/src/drivers/net/macsec.c:2068:5: warning: 'assoc_num' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/net/macsec.c:2068:24: warning: 'tx_sc' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/net/macsec.c:2069:21: warning: 'secy' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/net/tun.c: In function 'tun_get_user': /kisskb/src/drivers/net/tun.c:1835:30: warning: 'copylen' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/net/tun.c:1545:31: warning: 'linear' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/net/tun.c:1745:46: note: 'linear' was declared here /kisskb/src/kernel/acct.c: In function 'acct_pin_kill': /kisskb/src/kernel/acct.c:177:2: warning: value computed is not used [-Wunused-value] /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/fs/udf/unicode.c: In function 'udf_name_conv_char': /kisskb/src/fs/udf/unicode.c:132:8: warning: 'c' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/ocfs2/file.c: In function 'ocfs2_file_write_iter': /kisskb/src/fs/ocfs2/file.c:2386:3: warning: value computed is not used [-Wunused-value] /kisskb/src/fs/posix_acl.c: In function 'get_acl': /kisskb/src/fs/posix_acl.c:147:3: warning: value computed is not used [-Wunused-value] /kisskb/src/net/core/gen_stats.c: In function '__gnet_stats_copy_basic': /kisskb/src/net/core/gen_stats.c:149:19: warning: 'seq' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/net/core/flow_dissector.c: In function '__skb_flow_dissect': /kisskb/src/net/core/flow_dissector.c:789:7: warning: 'vlan' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/net/core/dev.c: In function 'validate_xmit_skb_list': /kisskb/src/net/core/dev.c:3161:15: warning: 'tail' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/net/sctp/output.c: In function 'sctp_packet_config': /kisskb/src/include/net/sock.h:1863:19: warning: 'sk' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/net/sctp/output.c:94:15: note: 'sk' was declared here Completed OK # rm -rf /kisskb/build/powerpc-next_m68k-defconfig_m68k # Build took: 0:04:19.770744

© Michael Ellerman 2006-2018.