Re: [musl] loongarch64 atomics not working?

[lixing <lixing@loongson.cn>]

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@entry=0,
>>      ts=ts@entry=0x7ffffffefb60) at src/time/clock_gettime.c:67
>> #3  0x000000012003830c in gettimeofday (tv=tv@entry=0x7ffffffefba0,
>>      tz=tz@entry=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