Re: [syzbot] Monthly bpf report (Jan 2024)

[Andrii Nakryiko]

On Tue, Jan 9, 2024 at 10:20 AM syzbot
<syzbot+listfa7dbe69051a666b7429@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello bpf maintainers/developers,
>
> This is a 31-day syzbot report for the bpf subsystem.
> All related reports/information can be found at:
> https://syzkaller.appspot.com/upstream/s/bpf
>
> During the period, 2 new issues were detected and 0 were fixed.
> In total, 15 issues are still open and 200 have been fixed so far.
>
> Some of the still happening issues:
>
> Ref Crashes Repro Title
> <1> 8166    Yes   possible deadlock in task_fork_fair
>                   https://syzkaller.appspot.com/bug?extid=1a93ee5d329e97cfbaff
> <2> 21      Yes   BUG: unable to handle kernel NULL pointer dereference in sk_msg_recvmsg
>                   https://syzkaller.appspot.com/bug?extid=84f695756ed0c4bb3aba
> <3> 19      Yes   WARNING in __mark_chain_precision (3)
>                   https://syzkaller.appspot.com/bug?extid=4d6330e14407721955eb

this was fixed a while ago in 482d548d ("bpf: handle fake register
spill to stack with BPF_ST_MEM instruction")

> <4> 3       Yes   INFO: rcu detected stall in sys_newfstatat (4)
>                   https://syzkaller.appspot.com/bug?extid=1c02a56102605204445c
> <5> 2       Yes   UBSAN: shift-out-of-bounds in adjust_reg_min_max_vals
>                   https://syzkaller.appspot.com/bug?extid=46700eea57ecc7f84776
> <6> 1       Yes   INFO: rcu detected stall in sys_unshare (9)
>                   https://syzkaller.appspot.com/bug?extid=872bccd9a68c6ba47718
>
> ---
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