Re: Host panic in bpf verifier when loading bpf prog in 5.10 stable kernel

[Aaron Lu <ziqianlu@bytedance.com>]

On Mon, Jun 23, 2025 at 10:17:15AM +0200, Greg Kroah-Hartman wrote:
> On Mon, Jun 16, 2025 at 03:06:17PM +0800, Aaron Lu wrote:
> > Ping?
> > 
> > On Thu, Jun 05, 2025 at 03:09:21PM +0800, Aaron Lu wrote:
> > > Hello,
> > > 
> > > Wei reported when loading his bpf prog in 5.10.200 kernel, host would
> > > panic, this didn't happen in 5.10.135 kernel. Test on latest v5.10.238
> > > still has this panic.
> > 
> > If a fix is not easy for these stable kernels, I think we should revert
> > this commit? Because for whatever bpf progs, the bpf verifier should not
> > panic the kernel.
> > 
> > Regarding revert, per my test, the following four commits in linux-5.10.y
> > branch have to be reverted and after that, the kernel does not panic
> > anymore:
> > commit 2474ec58b96d("bpf: allow precision tracking for programs with subprogs")
> > commit 7ca3e7459f4a("bpf: stop setting precise in current state")
> > commit 1952a4d5e4cf("bpf: aggressively forget precise markings during
> > state checkpointing")
> > commit 4af2d9ddb7e7("selftests/bpf: make test_align selftest more
> > robust")
> 
> Can you send the reverts for this, so that you get credit for finding
> and fixing this issue, and you can put the correct wording in the commit
> messages for why they need to be reverted?

No problem, thanks for the info.

I have sent them:
https://lore.kernel.org/stable/20250623115403.299-1-ziqianlu@bytedance.com/