call-to-call prioity mechanism

[David Lee]

Hi,

When running syz-manager, and viewing the status on webpage, there are tables like "Priorities for syscall_a", and there are different priority values under the prio column for other syscalls. Does the prio column represent the value of the next syscall to be chosen after the syscall_a? Also, how is the priority value determined? Thanks.

[Aleksandr Nogikh]

Hi,

On Wed, Oct 8, 2025 at 9:48 AM David Lee <sayni...@gmail.com> wrote:
>
> Hi,
>
> When running syz-manager, and viewing the status on webpage, there are tables like "Priorities for syscall_a", and there are different priority values under the prio column for other syscalls. Does the prio column represent the value of the next syscall to be chosen after the syscall_a?

Yes, kind of. The higher the number associated with syscall B, the
greater the chance of it being chosen after syscall A.

> Also, how is the priority value determined? Thanks.

You can find the corresponding logic in this file:
https://github.com/google/syzkaller/blob/master/prog/prio.go

--
Aleksandr