cmd/compile: illegal Instruction on POWER8 with go 1.13 #38909
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I also ran it on a POWER8 server with a slightly different CPU and it executed. 0 user@redacted /tmp # ./bt-test_linux_ppc64 whats going on! 0 user@redacted /tmp # uname -a Linux redacted 3.10.0-327.10.1.el7.ppc64 #1 SMP Sat Jan 23 04:57:27 EST 2016 ppc64 ppc64 ppc64 GNU/Linux 0 user@redacted /tmp # cat /etc/redhat-release Red Hat Enterprise Linux Server release 7.2 (Maipo) 0 user@redacted /tmp # lscpu Architecture: ppc64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Big Endian CPU(s): 8 On-line CPU(s) list: 0-7 Thread(s) per core: 8 Core(s) per socket: 1 Socket(s): 1 NUMA node(s): 2 Model: IBM,8284-22A L1d cache: 64K L1i cache: 32K NUMA node0 CPU(s): 0-7 NUMA node2 CPU(s): 0 user@redacted /tmp # |
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@laboger |
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@randall77 @laboger in my reproductions it seems to be related to the CPU model. but maybe also kernel version. For instance this rhel6 box with the same CPU model as my working rhel7 example does not work [user@redacted ~]# lscpu Architecture: ppc64 Byte Order: Big Endian CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 4 Core(s) per socket: 1 Socket(s): 1 NUMA node(s): 1 Model: IBM,8284-22A L1d cache: 64K L1i cache: 32K NUMA node0 CPU(s): 0-3 [user@redacted ~]# uname -a Linux redacted 2.6.32-573.18.1.el6.ppc64 #1 SMP Wed Jan 6 11:15:06 EST 2016 ppc64 ppc64 ppc64 GNU/Linux |
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This does not fail for me on the linux/ppc64 systems I have. I even tried doing a cross compile with latest go1.13 and moving it over to a power8 and it worked fine. I am not familiar with the model you are using and don't have access to such a system. Can you use gdb to find the bad instruction? |
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The model you display in your go env output is: |
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What RHEL 6 do you have on your 8284-22A? It should be at least RHEL 6.5 or RHEL 7 according to this https://www.ibm.com/support/knowledgecenter/linuxonibm/liaam/liaamdistros.html#liaamdistros__supportedpower8. |
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@laboger [user@rhel6-ppc64-01 tmp]# lscpu Architecture: ppc64 Byte Order: Big Endian CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 4 Core(s) per socket: 1 Socket(s): 1 NUMA node(s): 1 Model: IBM,8284-22A L1d cache: 64K L1i cache: 32K NUMA node0 CPU(s): 0-3 [user@rhel6-ppc64-01 tmp]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 6.7 (Santiago) with go 1.13 (gdb) run Starting program: /tmp/bt-test_linux_ppc64 Program received signal SIGILL, Illegal instruction. 0x000000000004995c in runtime.check () at /usr/local/go/src/runtime/runtime1.go:238 238 /usr/local/go/src/runtime/runtime1.go: No such file or directory. in /usr/local/go/src/runtime/runtime1.go (gdb) x/i $pc => 0x4995c : lbarx r31,0,r5 (gdb) and go 1.14 (gdb) run Starting program: /tmp/bt-test_linux_ppc64 Program received signal SIGILL, Illegal instruction. 0x000000000005007c in runtime.check () at /usr/local/go/src/runtime/runtime1.go:238 238 /usr/local/go/src/runtime/runtime1.go: No such file or directory. in /usr/local/go/src/runtime/runtime1.go (gdb) x/i $pc => 0x5007c : lbarx r31,0,r5 (gdb) |
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Can you provide the full output when it gets the SIGILL (not using gdb)? |
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Or in gdb after you hit the SIGILL: |
[user@rhel6-ppc64-01 tmp]# ./bt-test_linux_ppc64 Illegal instruction [user@rhel6-ppc64-01 tmp]# gdb ./bt-test_linux_ppc64 GNU gdb (GDB) Red Hat Enterprise Linux (7.2-83.el6) Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "ppc64-redhat-linux-gnu". For bug reporting instructions, please see: ... Reading symbols from /tmp/bt-test_linux_ppc64...done. warning: Missing auto-load scripts referenced in section .debug_gdb_scripts of file /tmp/bt-test_linux_ppc64 Use `info auto-load python [REGEXP]' to list them. (gdb) run Starting program: /tmp/bt-test_linux_ppc64 Program received signal SIGILL, Illegal instruction. 0x000000000004995c in runtime.check () at /usr/local/go/src/runtime/runtime1.go:238 238 /usr/local/go/src/runtime/runtime1.go: No such file or directory. in /usr/local/go/src/runtime/runtime1.go (gdb) p $_siginfo.si_code Attempt to extract a component of a value that is not a structure. (gdb) |
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Can you display /proc/cpuinfo on your RHEL6. |
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The suspicion is that your RHEL6.7 kernel is set up to run in power7 compat mode. Also run: |
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yup, that looks like it's it. Sorry for wasting your time, but thank you for your help! [user@rhel6-ppc64-01 ~]# cat /proc/cpuinfo processor : 0 cpu : POWER7 (architected), altivec supported clock : 3891.000000MHz revision : 2.1 (pvr 004b 0201) processor : 1 cpu : POWER7 (architected), altivec supported clock : 3891.000000MHz revision : 2.1 (pvr 004b 0201) processor : 2 cpu : POWER7 (architected), altivec supported clock : 3891.000000MHz revision : 2.1 (pvr 004b 0201) processor : 3 cpu : POWER7 (architected), altivec supported clock : 3891.000000MHz revision : 2.1 (pvr 004b 0201) timebase : 512000000 platform : pSeries model : IBM,8284-22A machine : CHRP IBM,8284-22A [user@rhel6-ppc64-01 ~]# LD_SHOW_AUXV=1 /bin/true | grep _PLATFORM AT_PLATFORM: power7 AT_BASE_PLATFORM:power8 |
What version of Go are you using (
go version)?Does this issue reproduce with the latest release?
Yes, it occurs when built with go 1.14 as well.
What operating system and processor architecture are you using (
go env)?go envOutputWhat did you do?
I built a minimal go binary on macOS Catalina cross-compiling to linux-ppc64 using https://github.com/trdyer/go-test-ppc64
My test platforms are: linux/amd64 solaris/amd64 darwin/amd64 linux/s390x aix/ppc64 linux/ppc64 linux/ppc64le
I scp'd the binary to the remote rhel7/ppc64 server and executed the program.
What did you expect to see?
The output should have said "whats going on!"
What did you see instead?
Illegal Instruction
As far as I can tell this is a POWER8 CPU that should be supported.
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