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runtime: TestGcSys fails on linux/amd64 #28574

tmthrgd opened this Issue Nov 3, 2018 · 7 comments


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tmthrgd commented Nov 3, 2018

What version of Go are you using (go version)?

$ go version
go version devel +1645dfa23f Fri Nov 2 23:22:57 2018 +0000 linux/amd64

Does this issue reproduce with the latest release?

It reproduces at master.

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build842792331=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Tried to build go at master with ./all.bash.

What did you expect to see?

Test passing with:

ok  	runtime XX.XXXs

What did you see instead?

Test failed with:

--- FAIL: TestGcSys (0.05s)
    gc_test.go:33: expected "OK\n", but got "using too much memory: 70877184 bytes\n"
FAIL	runtime	18.959s

This is the same issue as #27636 and #27156, but for linux/amd64 under Fedora 29.


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agnivade commented Nov 3, 2018

I am unable to reproduce this. Does this happen to you consistently ?


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Contributor Author

tmthrgd commented Nov 3, 2018

@agnivade It's only happened once, and I don't seem to be able to reproduce it.


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bcmills commented Dec 3, 2018

I just caught one in a local all.bash run on my workstation. Not much to go on, though.

--- FAIL: TestGcSys (0.03s)
    gc_test.go:33: expected "OK\n", but got "using too much memory: 70813696 bytes\n"
FAIL    runtime 26.806s

@bcmills bcmills added the Testing label Dec 3, 2018


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timtadh commented Jan 18, 2019

I got this when running ./all.bash to build the tag go1.12beta2.

here is my /proc/cpuinfo and /proc/meminfo

It didn't happen again when I reran the tests.


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halturin commented Mar 15, 2019

just tried to build most recent version of golang 1.12.1 and got the same message

-- FAIL: TestGcSys (0.04s)
    gc_test.go:33: expected "OK\n", but got "using too much memory: 70813696 bytes\n"
FAIL	runtime	57.344s

with exit code "Failed: exit status 1"


processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 45
model name	: Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz
stepping	: 7
microcode	: 0x70b
cpu MHz		: 3201.971
cache size	: 12288 KB
physical id	: 0
siblings	: 12
core id		: 0
cpu cores	: 6
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm epb kaiser tpr_shadow vnmi flexpriority ept vpid xsaveopt dtherm ida arat pln pts
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf
bogomips	: 6403.94
clflush size	: 64
cache_alignment	: 64
address sizes	: 46 bits physical, 48 bits virtual
power management:


MemTotal:       32890440 kB
MemFree:         1538792 kB
MemAvailable:    8796444 kB
Buffers:          348696 kB
Cached:         10537972 kB
SwapCached:         2516 kB
Active:         26935560 kB
Inactive:        2275984 kB
Active(anon):   21444808 kB
Inactive(anon):  1328884 kB
Active(file):    5490752 kB
Inactive(file):   947100 kB
Unevictable:        2880 kB
Mlocked:            2880 kB
SwapTotal:       6680572 kB
SwapFree:        6624272 kB
Dirty:             21648 kB
Writeback:             0 kB
AnonPages:      18325548 kB
Mapped:          5656576 kB
Shmem:           4448828 kB
Slab:            1469644 kB
SReclaimable:    1285528 kB
SUnreclaim:       184116 kB
KernelStack:       35728 kB
PageTables:       168184 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    23125792 kB
Committed_AS:   43038324 kB
VmallocTotal:   34359738367 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:     1149916 kB
DirectMap2M:    23955456 kB
DirectMap1G:     8388608 kB

git log -1

commit 0380c9ad38843d523d9c9804fe300cb7edd7cd3c
Author: Andrew Bonventre <>
Date:   Thu Mar 14 14:15:58 2019 -0400

    [release-branch.go1.12] go1.12.1
    Change-Id: Id5f76204b8cd3fe67c21c5adfd3a4e456a8cad14
    Run-TryBot: Andrew Bonventre <>
    TryBot-Result: Gobot Gobot <>
    Reviewed-by: Katie Hockman <>
    Reviewed-by: Dmitri Shuralyov <>

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kmcfate commented Apr 12, 2019

Can we please just remove this test. Failing on 32bit platforms for me.


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bcmills commented Apr 12, 2019

@kmcfate, if you're observing a different (or consistent) failure mode on 32-bit platforms, please open a separate issue — it may be easier to diagnose and fix that failure mode than the intermittent amd64 one.

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