** Changed in: qemu
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1906193
Title:
riscv32 user mode emulation: fork return values broken
Status in QEMU:
A fix has been merged into master.
** Changed in: qemu
Status: Confirmed => Fix Committed
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Title:
riscv32 user mode emulation: fork retu
Done (took a while to figure out how...)
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Title:
riscv32 user mode emulation: fork return values broken
Status in QEMU:
Confirmed
Bug descri
Can you add a Tested-by: tag to the patch?
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Title:
riscv32 user mode emulation: fork return values broken
Status in QEMU:
Confirmed
Bug desc
Just as a general remark, while this specific problem seems to be
solved, there may still be issues surrounding waitid().
(With this patch applied, in a rather complex environment I see bash
processes hanging in an infinite loop, with waitid involved. I am
working on isolating the problem and prov
** Changed in: qemu
Status: New => Confirmed
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Title:
riscv32 user mode emulation: fork return values broken
Status in QEMU:
Confirmed
Great! Thanks for testing that.
Do you mind supplying a Tested-by tag that I can apply to the patch?
Alistair
On Mon, Dec 21, 2020 at 5:36 AM Andreas K. Hüttel
<1906...@bugs.launchpad.net> wrote:
>
> After applying this patch on top of qemu-5.2.0, I can confirm that it
> fixes the problem.
>
> T
After applying this patch on top of qemu-5.2.0, I can confirm that it
fixes the problem.
Thank you!!
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Title:
riscv32 user mode emulation: fork
Thanks a lot! Will test and post the result on monday when I'm back
home.
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Title:
riscv32 user mode emulation: fork return values broken
Status
I have sent a patch, you can see it here:
https://patchwork.ozlabs.org/project/qemu-devel/list/?series=221381
It seems like QEMU's waitid implementation has a bug with handling the
status.
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Here's qemu's own strace log:
farino ~ # /usr/bin/qemu-riscv32 -strace /chroot/riscv-ilp32/tmp/wait-test-short
10123 brk(NULL) = 0x00073000
10123 brk(0x00073880) = 0x00073880
10123 uname(0x407ffed8) = 0
10123 readlinkat(AT_FDCWD,"/proc/self/exe",0x407feff0,4096) = 39
10123 brk(0x00094880) = 0x0009
Here's the (abbreviated) output of strace'ing qemu:
farino ~ # strace -f /usr/bin/qemu-riscv32
/chroot/riscv-ilp32/tmp/wait-test-short
execve("/usr/bin/qemu-riscv32", ["/usr/bin/qemu-riscv32",
"/chroot/riscv-ilp32/tmp/wait-tes"...], 0x7ffd95fb1330 /* 40 vars */) = 0
[...]
[pid 16569] uname({sy
I can confirm that the same binary works fine with qemu system
emulation:
(riscv-ilp32 qemu) (none) /tmp # ./wait-test-short
(riscv-ilp32 qemu) (none) /tmp #
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This is the (statically linked) binary resulting from the source; with
it the problem can be demonstrated "standalone", without any other rv32
libraries or a complete chroot, just running the binary with qemu-
riscv32.
Generated with
(riscv-ilp32 chroot) farino /tmp # gcc -static -o wait-test-sho
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