Public bug reported:

As seen in http://paste.ubuntu.com/16058192/ -- going to retry to see if
it goes away.

##### Testing race detector
ok      runtime/race    3.802s
ok      flag    1.058s
ok      os/exec 2.035s
==25469==ERROR: ThreadSanitizer failed to allocate 0x2718000 (40992768) bytes 
at address 1fe628e1f8080 (errno: 12)
unexpected fault address 0x0
fatal error: fault
[signal 0x7 code=0x80 addr=0x0 pc=0x7f98a342e0d5]

goroutine 1 [running, locked to thread]:
runtime.throw(0x0, 0x7f98a3258d38)
        /«PKGBUILDDIR»/src/runtime/panic.go:547 +0x90 fp=0x7ffc46ccb750 
sp=0x7ffc46ccb738

goroutine 17 [syscall, locked to thread]:
2016/04/26 00:31:09 Failed: exit status 1
runtime.goexit()
        /«PKGBUILDDIR»/src/runtime/asm_amd64.s:1998 +0x1 fp=0xc82003afb8 
sp=0xc82003afb0
exit status 2
FAIL    _/«PKGBUILDDIR»/misc/cgo/test   0.013s
2016/04/26 00:31:09 Failed: exit status 1
==24614==ERROR: ThreadSanitizer failed to allocate 0x26e8000 (40796160) bytes 
at address 1fe9c207ec080 (errno: 12)
unexpected fault address 0x0
fatal error: fault
[signal 0x7 code=0x80 addr=0x0 pc=0x7fa707e96075]

goroutine 1 [running, locked to thread]:
runtime.throw(0x0, 0x7fa707d6a308)
        /«PKGBUILDDIR»/src/runtime/panic.go:547 +0x90 fp=0x7ffe326f32a0 
sp=0x7ffe326f3288

goroutine 17 [syscall, locked to thread]:
runtime.goexit()
        /«PKGBUILDDIR»/src/runtime/asm_amd64.s:1998 +0x1
FAIL    flag    0.054s
==24786==ERROR: ThreadSanitizer failed to allocate 0x2720000 (41025536) bytes 
at address 1fe78376bc080 (errno: 12)
unexpected fault address 0x0
fatal error: fault
[signal 0x7 code=0x80 addr=0x0 pc=0x7f9e0d849205]

goroutine 1 [running, locked to thread]:
runtime.throw(0x0, 0x7f9e0d499f18)
        /«PKGBUILDDIR»/src/runtime/panic.go:547 +0x90 fp=0x7ffd50a49a00 
sp=0x7ffd50a499e8

goroutine 17 [syscall, locked to thread]:
runtime.goexit()
        /«PKGBUILDDIR»/src/runtime/asm_amd64.s:1998 +0x1
FAIL    os/exec 0.015s

** Affects: golang-1.6 (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  As seen in http://paste.ubuntu.com/16058192/ -- going to retry to see if
  it goes away.
+ 
+ ##### Testing race detector
+ ok    runtime/race    3.802s
+ ok    flag    1.058s
+ ok    os/exec 2.035s
+ ==25469==ERROR: ThreadSanitizer failed to allocate 0x2718000 (40992768) bytes 
at address 1fe628e1f8080 (errno: 12)
+ unexpected fault address 0x0
+ fatal error: fault
+ [signal 0x7 code=0x80 addr=0x0 pc=0x7f98a342e0d5]
+ 
+ goroutine 1 [running, locked to thread]:
+ runtime.throw(0x0, 0x7f98a3258d38)
+       /«PKGBUILDDIR»/src/runtime/panic.go:547 +0x90 fp=0x7ffc46ccb750 
sp=0x7ffc46ccb738
+ 
+ goroutine 17 [syscall, locked to thread]:
+ 2016/04/26 00:31:09 Failed: exit status 1
+ runtime.goexit()
+       /«PKGBUILDDIR»/src/runtime/asm_amd64.s:1998 +0x1 fp=0xc82003afb8 
sp=0xc82003afb0
+ exit status 2
+ FAIL  _/«PKGBUILDDIR»/misc/cgo/test   0.013s
+ 2016/04/26 00:31:09 Failed: exit status 1
+ ==24614==ERROR: ThreadSanitizer failed to allocate 0x26e8000 (40796160) bytes 
at address 1fe9c207ec080 (errno: 12)
+ unexpected fault address 0x0
+ fatal error: fault
+ [signal 0x7 code=0x80 addr=0x0 pc=0x7fa707e96075]
+ 
+ goroutine 1 [running, locked to thread]:
+ runtime.throw(0x0, 0x7fa707d6a308)
+       /«PKGBUILDDIR»/src/runtime/panic.go:547 +0x90 fp=0x7ffe326f32a0 
sp=0x7ffe326f3288
+ 
+ goroutine 17 [syscall, locked to thread]:
+ runtime.goexit()
+       /«PKGBUILDDIR»/src/runtime/asm_amd64.s:1998 +0x1
+ FAIL  flag    0.054s
+ ==24786==ERROR: ThreadSanitizer failed to allocate 0x2720000 (41025536) bytes 
at address 1fe78376bc080 (errno: 12)
+ unexpected fault address 0x0
+ fatal error: fault
+ [signal 0x7 code=0x80 addr=0x0 pc=0x7f9e0d849205]
+ 
+ goroutine 1 [running, locked to thread]:
+ runtime.throw(0x0, 0x7f9e0d499f18)
+       /«PKGBUILDDIR»/src/runtime/panic.go:547 +0x90 fp=0x7ffd50a49a00 
sp=0x7ffd50a499e8
+ 
+ goroutine 17 [syscall, locked to thread]:
+ runtime.goexit()
+       /«PKGBUILDDIR»/src/runtime/asm_amd64.s:1998 +0x1
+ FAIL  os/exec 0.015s

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https://bugs.launchpad.net/bugs/1574916

Title:
  go test -race os/exec fails

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