Does anyone here use a ryzen ?  I got a 1300X recently, and building
current rustc - and using that to build firefox - seems to work
fine.  BUT - I had not bothered to run the rustc testsuite because
it takes so long.

But those initial builds of rustc were to install it in /opt -
seemed good enough, so I decided to install it in /usr and to see
how the test results looked.  Disaster.

Every time I run the tests, within a couple of minutes I get two
traps for invalid opcodes, followed a few minutes later by two
segfaults (noted by reading syslog, the tests seem to continue as
normal).  But if I leave the tests running, about 20 to 30 minutes
later (before the end of the tests, according to what got written
to the log) the machine reboots.  These are all that got logged the
first time, nothingrelated to the reboot.

Apr  6 06:37:48 origin kernel: [ 3695.201558] traps: backtrace.stage[17714] 
trap invalid opcode ip:7f1e76696498 sp:7ffc6848af80 error:0 in[7f1e7663c000+155000]
Apr  6 06:37:48 origin kernel: [ 3695.231521] traps: backtrace.stage[17720] 
trap invalid opcode ip:7f76e0ff0498 sp:7ffc2bf46850 error:0 in[7f76e0f96000+155000]
Apr  6 06:41:17 origin kernel: [ 3903.999612] segfault-no-out[31250]: segfault 
at 0 ip 0000555aa6cd0b69 sp 00007ffeb0d96fa0 error 6 in 
Apr  6 06:41:23 origin kernel: [ 3910.633482] signal-exit-sta[32055]: segfault 
at 1 ip 000055afe3b44efc sp 00007fffc985f660 error 6 in 
Apr  6 06:41:26 origin kernel: [ 3913.231883] traps: simd-target-fea[32330] 
trap invalid opcode ip:55b72481e89c sp:7fff97757750 error:0 in 

Now that I know it will reboot, I've spend some hours trying to work
around this (I'm assuming it uses opcodes not valid on Ryzen, but
for somiething which is only exercised by the testsuite) - failed
completely - and eventually raised an issue.

However, I've now looked at rustc-1.22.1 and that too gets the same
two traps.  so, I'm thinking that I should put a big warning in the
book to not run the tests on a Ryzen.

But confirmation that the tests segfault on somebody else's ryzen
would be conclusive, which is why I'm asking: has anyone already run
the rustc tests on a ryzen ?  If not, is anybody willing to give it
a go on a ryzen ?  Waiting for it to reboot is not required, just
keep an eye on the system log or journal and stop the tests if the
segfaults occur.

My machine otherwise seems stable (I replaced the nvidia graphics
card with a low-nd radeon because nouveau frequently locked up X,
since then it has seemed fine apart from this.  And no, I'm not
overclocking, the CPU seems to run cool (maximum I've seen was low
50s degrees).

In my seventh decade astride this planet, and as my own cells degrade,
there are some things I cannot do now: skydiving, marathon running,
calculus. I couldn't do them in my 20s either, so no big loss.
            -- Derek Smalls, formerly of Spinal Tap
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