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Date: Tue, 12 Mar 2024 16:31:12 +0800
From: lixing <lixing@...ngson.cn>
To: musl@...ts.openwall.com
Subject: Re: loongarch64 atomics not working?
在 2024/3/12 上午10:06, Hongliang Wang 写道:
>
>
> 在 2024/3/12 上午8:51, Rich Felker 写道:
>> There's been a report of mksh hanging on loongarch64, at least under
>> qemu, apparently hanging in a_cas_p:
>>
>> (gdb) run
>> Starting program: /mksh
>> ^C
>> Program received signal SIGINT, Interrupt.
>> a_cas_p (p=0x120054288 <vdso_func>, t=0x12003b970 <cgt_init>,
>> s=0x7fffffffc34c)
>> at ./src/internal/atomic.h:94
>> warning: 94 ./src/internal/atomic.h: No such file or directory
>> (gdb) bt
>> #0 a_cas_p (p=0x120054288 <vdso_func>, t=0x12003b970 <cgt_init>,
>> s=0x7fffffffc34c) at ./src/internal/atomic.h:94
>> #1 cgt_init (clk=0, ts=0x7ffffffefb60) at src/time/clock_gettime.c:51
>> #2 0x000000012003ba4c in __clock_gettime (clk=clk@...ry=0,
>> ts=ts@...ry=0x7ffffffefb60) at src/time/clock_gettime.c:67
>> #3 0x000000012003830c in gettimeofday (tv=tv@...ry=0x7ffffffefba0,
>> tz=tz@...ry=0x0) at src/time/gettimeofday.c:9
>> #4 0x000000012002f098 in change_winsz () at var.c:1718
>> #5 0x0000000120000348 in main_init (lp=<synthetic pointer>,
>> sp=<synthetic pointer>, argv=0x7ffffffefd18, argc=1) at main.c:369
>> #6 main (argc=<optimized out>, argv=<optimized out>) at main.c:738
>>
>> This is very basic usage, just the vdso clock_gettime init code trying
>> to replace a pointer atomically. Is it working on real hardware? I'm
>> trying to figure out if this is a qemu bug, or if the asm or the asm
>> argument constraints are wrong in musl's
>> arch/loongarch64/atomic_arch.h.
>>
>> Rich
>>
>
> We will test it on real hardware to confirm if it can work as soon as
> possible.
>
> Regards,
> Hongliang Wang
Hi, Rich
We've tested static and dynamic build mksh with commit id
cbb8a0196aab53165a35339fd91ade599d184f both works ok.
We compiled qemu 8.2.2 with the following configuration:
./configure --prefix=/usr --target-list=loongarch64-linux-user
--disable-werror --static --disable-docs
then run with qemu-loongarch64 ./mksh without hang.
Thanks,
XingLi
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