Date: Sat, 26 Nov 2016 23:42:37 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 214862] clang 3.9.0 vs. TARGET_ARCH=powerpc: fsck_ufs and "df -m" are example failures: __floatdidf gets SIGSEGV's in both of them Message-ID: <bug-214862-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214862 Bug ID: 214862 Summary: clang 3.9.0 vs. TARGET_ARCH=powerpc: fsck_ufs and "df -m" are example failures: __floatdidf gets SIGSEGV's in both of them Product: Base System Version: CURRENT Hardware: powerpc OS: Any Status: New Severity: Affects Only Me Priority: --- Component: bin Assignee: freebsd-bugs@FreeBSD.org Reporter: markmi@dsl-only.net [This is largely extracted from a list report that I made.] I updated to head -r309197 (with a work around for -r309144 breaking the build). This was on amd64, then used it to try to cross buildworld using clang 3.9.0 for TARGET_ARCH=powerpc . The build completed. (I've been using clang 3.8.0 this way for a long time.) [The kernel here was cross built via gcc 4.2.1, as has been my normal procedure. The kernel still has my "red zone for signal delivery" hack that was a workaround for clang 3.8.0 stack-handling ABI violations.] Booting, however, had problems because of fsck_ufs getting signal 11 and ended up initially in single user mode. Exiting single user did finish the boot. But "df -m" core dumps. (I've not explored much else.) Turns out that both fsck_ufs and "df -m" fail in the same routine for a SIGSEGV: __floatdidf The details. . . First the boot and fsck_ufs: Copyright (c) 1992-2016 The FreeBSD Project. Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 The Regents of the University of California. All rights reserved. FreeBSD is a registered trademark of The FreeBSD Foundation. FreeBSD 12.0-CURRENT #9 r309179M: Sat Nov 26 12:53:11 PST 2016 markmi@FreeBSDx64:/usr/obj/powerpcvtsc_clang_gcc421_kernel/powerpc.powerpc/usr/src/sys/GENERICvtsc-NODBG powerpc gcc version 4.2.1 20070831 patched [FreeBSD] cpu0: IBM PowerPC 970MP revision 1.1, 18446744071914.91 MHz cpu0: Features dc000000<PPC32,PPC64,ALTIVEC,FPU,MMU> cpu0: HID0 1511081<DEEPNAP,NAP,DPM,NHR,TBEN,ENATTN> real memory = 2118565888 (2020 MB) avail memory = 2014863360 (1921 MB) FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs . . . Trying to mount root from ufs:/dev/ufs/FBSDG4Srootfs [rw,noatime]... . . . pid 53 (fsck_ufs), uid 0: exited on signal 11 Manually running fsck later gets a segmentation fault core file in /var/crash/ and I used this too see a point of failure (__floatdidf): # fsck / ** /dev/ufs/FBSDG4Srootfs (NO WRITE) ** Last Mounted on / ** Root file system ** Phase 1 - Check Blocks and Sizes INCORRECT BLOCK COUNT I=11538459 (8 should be 0) CORRECT? no ** Phase 2 - Check Pathnames ** Phase 3 - Check Connectivity ** Phase 4 - Check Reference Counts LINK COUNT FILE I=10016041 OWNER=operator MODE=100400 SIZE=4096 MTIME=Nov 26 14:44 2016 COUNT 2 SHOULD BE 1 ADJUST? no LINK COUNT FILE I=10016049 OWNER=operator MODE=100400 SIZE=4096 MTIME=Nov 26 14:55 2016 COUNT 2 SHOULD BE 1 ADJUST? no LINK COUNT FILE I=10016089 OWNER=operator MODE=100400 SIZE=4096 MTIME=Nov 26 15:00 2016 COUNT 2 SHOULD BE 1 ADJUST? no UNREF FILE I=11538459 OWNER=root MODE=100600 SIZE=0 MTIME=Nov 26 15:11 2016 RECONNECT? no CLEAR? no ** Phase 5 - Check Cyl groups FREE BLK COUNT(S) WRONG IN SUPERBLK SALVAGE? no SUMMARY INFORMATION BAD SALVAGE? no BLK(S) MISSING IN BIT MAPS SALVAGE? no fsck: /dev/ufs/FBSDG4Srootfs: Segmentation fault # gdb fsck_ufs /var/crash/fsck_ufs.1129.core GNU gdb 6.1.1 [FreeBSD] Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "powerpc-marcel-freebsd"... Core was generated by `fsck_ufs /dev/ufs/FBSDG4Srootfs'. Program terminated with signal 11, Segmentation fault. Reading symbols from /lib/libufs.so.6...Reading symbols from /usr/lib/debug//lib/libufs.so.6.debug...done. done. Loaded symbols for /lib/libufs.so.6 Reading symbols from /lib/libc.so.7...Reading symbols from /usr/lib/debug//lib/libc.so.7.debug...done. done. Loaded symbols for /lib/libc.so.7 Reading symbols from /libexec/ld-elf.so.1...Reading symbols from /usr/lib/debug//libexec/ld-elf.so.1.debug...done. done. Loaded symbols for /libexec/ld-elf.so.1 #0 0x0181b024 in __floatdidf () (gdb) bt #0 0x0181b024 in __floatdidf () #1 0x0180a8e0 in main (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/sbin/fsck_ffs/main.c:519 #2 0x01801664 in _start () #3 0x418303a0 in .text () at /usr/src/libexec/rtld-elf/powerpc/rtld_start.S:112 main.c's line 519 is part of: printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n", (uintmax_t)n_ffree, (uintmax_t)n_bfree, n_ffree * 100.0 / sblock.fs_dsize); As for "df -m" --it failed in __floatdidf as well: # gdb df /var/crash/df.1056.core GNU gdb 6.1.1 [FreeBSD] Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "powerpc-marcel-freebsd"... Core was generated by `df -m'. Program terminated with signal 11, Segmentation fault. Reading symbols from /lib/libxo.so.0...Reading symbols from /usr/lib/debug//lib/libxo.so.0.debug...done. done. Loaded symbols for /lib/libxo.so.0 Reading symbols from /lib/libutil.so.9...Reading symbols from /usr/lib/debug//lib/libutil.so.9.debug...done. done. Loaded symbols for /lib/libutil.so.9 Reading symbols from /lib/libc.so.7...Reading symbols from /usr/lib/debug//lib/libc.so.7.debug...done. done. Loaded symbols for /lib/libc.so.7 Reading symbols from /libexec/ld-elf.so.1...Reading symbols from /usr/lib/debug//libexec/ld-elf.so.1.debug...done. done. Loaded symbols for /libexec/ld-elf.so.1 #0 0x01802a18 in __floatdidf () (gdb) bt #0 0x01802a18 in __floatdidf () #1 0x01802538 in prtstat (sfsp=0x41e24000, mwp=0xffffd930) at /usr/src/bin/df/df.c:503 #2 0x01801df0 in main (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/bin/df/df.c:308 #3 0x01800cdc in _start () #4 0x418153a0 in .text () at /usr/src/libexec/rtld-elf/powerpc/rtld_start.S:112 df.c's line 503 was part of: xo_emit(" {:used-percent/%5.0f}{U:%%}", availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0); Context details: # head ~/sys_typescripts/typescript_make_powerpcvtsc_nodebug_clang_bootstrap_world-amd64-host-2016-11-26:11:38:36 Script started on Sat Nov 26 11:38:36 2016 Command: env __MAKE_CONF=/root/src.configs/make.conf SRCCONF=/dev/null SRC_ENV_CONF=/root/src.configs/src.conf.powerpc-clang-bootstrap.amd64-host WITH_META_MODE=yes MAKEOBJDIRPREFIX=/usr/obj/powerpcvtsc_clang_world make -j 5 buildworld --- buildworld --- . . . # more ~/src.configs/src.conf.powerpc-clang-bootstrap.amd64-host TO_TYPE=powerpc # KERNCONF=GENERICvtsc-NODBG TARGET=${TO_TYPE} .if ${.MAKE.LEVEL} == 0 TARGET_ARCH=${TO_TYPE} .export TARGET_ARCH .endif # WITH_CROSS_COMPILER= WITHOUT_SYSTEM_COMPILER= # WITH_LIBCPLUSPLUS= WITH_BINUTILS_BOOTSTRAP= WITH_CLANG_BOOTSTRAP= WITH_CLANG= WITH_CLANG_IS_CC= WITH_CLANG_FULL= WITH_CLANG_EXTRAS= # lldb requires missing atomic 8-byte operations for powerpc (non-64) WITHOUT_LLDB= # WITH_BOOT= WITHOUT_LIB32= # WITHOUT_ELFTOOLCHAIN_BOOTSTRAP= WITHOUT_GCC_BOOTSTRAP= WITHOUT_GCC= WITHOUT_GCC_IS_CC= WITHOUT_GNUCXX= # NO_WERROR= #WERROR= MALLOC_PRODUCTION= # WITH_DEBUG_FILES= # more ~/src.configs/make.conf CFLAGS.gcc+= -v -- You are receiving this mail because: You are the assignee for the bug.
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