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    SubjectRe: [syzbot] BUG: corrupted list in netif_napi_add
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    Jakub Kicinski <kuba@kernel.org> writes:

    > On Mon, 18 Oct 2021 17:04:19 +0300 Vlad Buslov wrote:
    >> We got a use-after-free with very similar trace [0] during nightly
    >> regression. The issue happens when ip link up/down state is flipped
    >> several times in loop and doesn't reproduce for me manually. The fact
    >> that it didn't reproduce for me after running test ten times suggests
    >> that it is either very hard to reproduce or that it is a result of some
    >> interaction between several tests in our suite.
    >>
    >> [0]:
    >>
    >> [ 3187.779569] mlx5_core 0000:08:00.0 enp8s0f0: Link up
    >> [ 3187.890694] ==================================================================
    >> [ 3187.892518] BUG: KASAN: use-after-free in __list_add_valid+0xc3/0xf0
    >> [ 3187.894132] Read of size 8 at addr ffff8881150b3fb8 by task ip/119618
    >
    > Hm, not sure how similar it is. This one looks like channel was freed
    > without deleting NAPI. Do you have list debug enabled?

    Well, the other report[0] also kinda looks like the NAPI thread keeps
    running after it should have been disabled, so maybe they are in fact
    related?

    -Toke

    [0] https://lore.kernel.org/r/000000000000c1524005cdeacc5f@google.com

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