maintainer-feedback requested: [Bug 206664] lang/ruby21: miniruby gets bus error on arm that requires alignment (SCTLR bit[1]==1); build fails
bugzilla-noreply at freebsd.org
bugzilla-noreply at freebsd.org
Wed Jan 27 07:54:43 UTC 2016
Mark Millard <markmi at dsl-only.net> has reassigned Bugzilla Automation
<bugzilla at FreeBSD.org>'s request for maintainer-feedback to ruby at FreeBSD.org:
Bug 206664: lang/ruby21: miniruby gets bus error on arm that requires alignment
(SCTLR bit[1]==1); build fails
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206664
--- Description ---
To show the Bus Error details I show running the miniruby that the build had
produced directly under gdb:
# gdb /usr/obj/portswork/usr/ports/lang/ruby21/work/ruby-2.1.8/miniruby
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 "armv6-marcel-freebsd"...
(gdb) run
Starting program:
/usr/obj/portswork/usr/ports/lang/ruby21/work/ruby-2.1.8/miniruby
[New LWP 100182]
[New Thread 20810000 (LWP 100182/miniruby)]
Program received signal SIGBUS, Bus error.
[Switching to Thread 20810000 (LWP 100182/miniruby)]
0x00223ae4 in $a.107 () at compile.c:1610
1610 *ci = *base_ci;
(gdb) info threads
[New Thread 20810300 (LWP 100247/miniruby)]
3 Thread 20810300 (LWP 100247/miniruby) 0x204e891c in _poll () from
/lib/libc.so.7
* 2 Thread 20810000 (LWP 100182/miniruby) 0x00223ae4 in $a.107 () at
compile.c:1610
(gdb) bt
#0 0x00223ae4 in $a.107 () at compile.c:1610
#1 0x00223680 in $a.105 () at compile.c:1529
(gdb) x/30i 0x00223ad0
0x223ad0 <$a.107+748>: add r0, r1, r0, lsl #6
0x223ad4 <$a.107+752>: str r0, [sp, #72]
0x223ad8 <$a.107+756>: ldr r1, [sp, #76]
0x223adc <$a.107+760>: add r2, r0, #48 ; 0x30
0x223ae0 <$a.107+764>: add r3, r1, #48 ; 0x30
0x223ae4 <$a.107+768>: vld1.64 {d16-d17}, [r3]
0x223ae8 <$a.107+772>: vst1.64 {d16-d17}, [r2]
0x223aec <$a.107+776>: add r2, r0, #32 ; 0x20
0x223af0 <$a.107+780>: add r3, r1, #32 ; 0x20
0x223af4 <$a.107+784>: vld1.64 {d16-d17}, [r3]
0x223af8 <$a.107+788>: vst1.64 {d16-d17}, [r2]
0x223afc <$a.107+792>: vld1.64 {d16-d17}, [r1]!
0x223b00 <$a.107+796>: vst1.64 {d16-d17}, [r0]!
0x223b04 <$a.107+800>: vld1.64 {d16-d17}, [r1]
0x223b08 <$a.107+804>: vst1.64 {d16-d17}, [r0]
0x223b0c <$a.107+808>: ldr r0, [sp, #76]
0x223b10 <$a.107+812>: ldr r0, [r0, #56]
0x223b14 <$a.107+816>: ldr r1, [r11, #-8]
0x223b18 <$a.107+820>: ldr r1, [r1, #76]
0x223b1c <$a.107+824>: cmp r0, r1
0x223b20 <$a.107+828>: blt 0x223b48 <$a.107+868>
0x223b24 <$a.107+832>: b 0x223b28 <$a.107+836>
0x223b28 <$a.107+836>: ldr r0, [sp, #76]
0x223b2c <$a.107+840>: ldr r1, [r0, #44]
0x223b30 <$a.107+844>: ldr r0, [r11, #-8]
0x223b34 <$a.107+848>: ldr r2, [r0, #76]
0x223b38 <$a.107+852>: ldr r0, [pc, #1000] ; 0x223f28 <$d.108+4>
0x223b3c <$a.107+856>: add r0, pc, r0
0x223b40 <$a.107+860>: mov lr, pc
0x223b44 <$a.107+864>: b 0x79f48 <rb_bug>
(gdb) info registers
r0 0x20829280 545428096
r1 0x2094e62c 546629164
r2 0x208292b0 545428144
r3 0x2094e65c 546629212
r4 0x1 1
r5 0x0 0
r6 0xbfbfe32c -1077943508
r7 0xbfbf9718 -1077962984
r8 0x20922600 546448896
r9 0x20922828 546449448
r10 0x20922720 546449184
r11 0xbfbf95c0 -1077963328
r12 0x29 41
sp 0xbfbf94f8 -1077963528
lr 0x223680 2242176
pc 0x223ae4 2243300
fps 0x0 0
cpsr 0x80000010 -2147483632
The "vld1.64 {d16-d17}, [r3]" require 8 byte alignment for an armv7-a with
SCTLR bit[1]==1 but r3=0x2094e65c does not meet that criteria.
The original failure notices were:
linking miniruby
--- .rbconfig.time ---
--- encdb.h ---
generating encdb.h
./miniruby: [BUG] Bus Error at 0x2094e65c
ruby 2.1.8p440 (2015-12-16 revision 53160) [armv6-freebsd11]
-- Control frame information -----------------------------------------------
c:0001 p:0000 s:0002 E:0015c4 TOP [FINISH]
-- Other runtime information -----------------------------------------------
* Loaded script: ./miniruby
* Loaded features:
0 enumerator.so
[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html
--- .rbconfig.time ---
./miniruby: [BUG] Bus Error at 0x2094e65c
ruby 2.1.8p440 (2015-12-16 revision 53160) [armv6-freebsd11]
-- Control frame information -----------------------------------------------
c:0001 p:0000 s:0002 E:0015c4 TOP [FINISH]
-- Other runtime information -----------------------------------------------
* Loaded script: ./miniruby
* Loaded features:
0 enumerator.so
[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html
But the .core files produced do not show the original Bus Error(s) so I showed
the run above instead.
Of note is that I'm working on a RPI2B and everything from
buildworld/buildkernel to ports in my build activities are targeting the
armv7-a/cortex-a7 that an RPI2B has, not a more generic armv6. Also I'm using
projects/clang380-import because clang++ 3.7.1 Bus Errors during most C++
compiles. 3.8.0 has a bunch of alignment fixes in it to allow use with SCTLR
Bit[1]==1 (and on sparc's that require alignment).
As for the details of targeting armv7-a and cortex-a7, I show some of the
checking output that shows the command's arguments for such:
checking whether we are using the GNU C compiler... yes
checking whether /usr/bin/clang -target armv6--freebsd11.0-gnueabi
-march=armv7-a -mcpu=cortex-a7 -mfloat-abi=softfp -mno-unaligned-access accepts
-g... yes
checking for /usr/bin/clang -target armv6--freebsd11.0-gnueabi -march=armv7-a
-mcpu=cortex-a7 -mfloat-abi=softfp -mno-unaligned-access option to accept ISO
C89... none needed
checking whether we are using the GNU C++ compiler... yes
checking whether /usr/bin/clang++ -target armv6--freebsd11.0-gnueabi
-march=armv7-a -mcpu=cortex-a7 -mfloat-abi=softfp -mno-unaligned-access accepts
-g... yes
checking how to run the C preprocessor... /usr/bin/clang-cpp -target
armv6--freebsd11.0-gnueabi -march=armv7-a -mcpu=cortex-a7 -mfloat-abi=softfp
-mno-unaligned-access
My /usr/ports is at -r407323 on the RPI2B as I'm doing this activity.
Note: I was not directly trying to use ruby. I was just trying to do a ports
based install of portupgrade (that in turn depends on ruby).
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