Hi Jakub, Thanks for following up. Sorry that I did not receive the previous reply. The latest version I tested is 5.19 (3d7cb6b04c3f) and we can reproduce the issue with the BPF PoC included. Since we modified Syzkaller, we do not have a Syzkaller reproducer. I will follow John's suggestion to test the latest kernel and bpf tree. I will follow up if the issue still reproduces. Thanks, Hsin-Wei On Fri, Feb 24, 2023 at 8:51 AM Jakub Sitnicki <jakub@xxxxxxxxxxxxxx> wrote: > > Hi, > > On Mon, Feb 20, 2023 at 07:39 AM -06, Hsin-Wei Hung wrote: > > I think my previous report got blocked since it contained HTML > > subparts so I am sending it again. Our bpf runtime fuzzer (a > > customized syzkaller) triggered a lockdep warning in the bpf subsystem > > indicating a potential deadlock. We are able to trigger this bug on > > v5.15.25 and v5.19. The following code is a BPF PoC, and the lockdep > > warning is attached at the end. > > Not sure if you've seen John's reply to the previous report: > > https://urldefense.com/v3/__https://lore.kernel.org/all/63dddcc92fc31_6bb15208e9@john.notmuch/__;!!CzAuKJ42GuquVTTmVmPViYEvSg!PU-LFxMnx4b-GmTXGI0hYjBiq8vkwrFrlf_b0N5uzy8do5kPFiNcuZJbby-19TtOH2rJoY9UwOvzFArd$ > > Are you also fuzzing any newer kernel versions? Or was v5.19 the latest? > > Did syzkaller find a reproducer? > > Thanks, > Jakub
