Re: [BUG] accel/tcg: cpu_exec_longjmp_cleanup: assertion failed: (cpu == current_cpu)

[Richard Henderson]

On 11/25/23 07:08, Petr Cvek wrote:
> ERROR:../accel/tcg/cpu-exec.c:546:cpu_exec_longjmp_cleanup: assertion failed: 
> (cpu == current_cpu)
> Bail out! ERROR:../accel/tcg/cpu-exec.c:546:cpu_exec_longjmp_cleanup: assertion 
> failed: (cpu == current_cpu)
> #
>
> The code fails either with or without -singlestep, the command line:
>
> /usr/bin/qemu-x86_64 -L /opt/x86_64 -strace -singlestep  /opt/x86_64/alarm.bin
>
> Source code of QEMU 8.1.1 was modified with patch "[PATCH] qemu/timer: Don't use 
> RDTSC on i486" [1],
> with added few ioctls (not relevant) and cpu_exec_longjmp_cleanup() now prints 
> current pointers of
> cpu and current_cpu (line "0x48874a != 0x3c69e10").


If you try this again with 8.2-rc2, you should not see an assertion failure.
You should see instead

QEMU internal SIGILL {code=ILLOPC, addr=0x12345678}

which I think more accurately summarizes the situation of attempting RDTSC on hardware 
that does not support it.



r~