Since this has been fixed/worked around on the go side (thanks for
following up with that!) I'm going to close this as "wontfix" on QEMU's
side. It would be nice to support clone() with non-standard flags but
since we can't do that while we still link with libc there's no way we
can do this without a massive (and massively painful!) redesign to
remove our libc dependency so that all of QEMU's linux-user code runs
bare on the kernel.
** Changed in: qemu
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1696353
Title:
golang binaries fail to start under linux-user
Status in QEMU:
Won't Fix
Bug description:
With current master golang binaries fail when run under linux-user,
for example:
[will@localhost qemu]$ ./arm-linux-user/qemu-arm glide
runtime: failed to create new OS thread (have 2 already; errno=22)
fatal error: newosproc
runtime stack:
runtime.throw(0x45f879, 0x9)
/usr/lib/golang/src/runtime/panic.go:566 +0x78
runtime.newosproc(0x1092c000, 0x1093bfe0)
/usr/lib/golang/src/runtime/os_linux.go:160 +0x1b0
runtime.newm(0x4ae1e8, 0x0)
/usr/lib/golang/src/runtime/proc.go:1572 +0x12c
runtime.main.func1()
/usr/lib/golang/src/runtime/proc.go:126 +0x24
runtime.systemstack(0x5ef900)
/usr/lib/golang/src/runtime/asm_arm.s:247 +0x80
runtime.mstart()
/usr/lib/golang/src/runtime/proc.go:1079
goroutine 1 [running]:
runtime.systemstack_switch()
/usr/lib/golang/src/runtime/asm_arm.s:192 +0x4 fp=0x109287ac
sp=0x109287a8
runtime.main()
/usr/lib/golang/src/runtime/proc.go:127 +0x5c fp=0x109287d4
sp=0x109287ac
runtime.goexit()
/usr/lib/golang/src/runtime/asm_arm.s:998 +0x4 fp=0x109287d4
sp=0x109287d4
The reason for this is that the golang runtime does not pass the
CLONE_SYSVMEM flag to clone so the clone flags checks fail:
https://github.com/golang/go/blob/master/src/runtime/os_linux.go#L155
The attached patch allows golang binaries to start under linux-user.
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