Re: net/tcp: warning in tcp_try_coalesce/skb_try_coalesce
From: Eric Dumazet <hidden>
Date: 2017-02-02 12:20:33
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On Thu, 2017-02-02 at 10:05 +0100, Dmitry Vyukov wrote:
On Tue, Jan 31, 2017 at 3:27 PM, 'Eric Dumazet' via syzkaller [off-list ref] wrote:quoted
On Tue, Jan 31, 2017 at 5:17 AM, Andrey Konovalov [off-list ref] wrote:quoted
Hi, I've got the following error report while running the syzkaller fuzzer. On commit 566cf877a1fcb6d6dc0126b076aad062054c2637 (4.10-rc6). The fuzzer hits this issue quite often, but I don't have a working reproducer. WARNING: CPU: 3 PID: 7091 at net/core/skbuff.c:4331 skb_try_coalesce+0x14b1/0x1f80 net/core/skbuff.c:4331 Kernel panic - not syncing: panic_on_warn set ......quoted
Have you tried the patch we added recently into net-next ? https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=158f323b9868b59967ad96957c4ca388161be321I've tried this patch, and it does _not_ help. I am currently on a2ca3d617944417e9dd5f09fc8a4549cda115f4f, and I applied the patch on top (had to do a little merging in af_netlink.c): https://gist.githubusercontent.com/dvyukov/b4fd206f7dde763b3113a4543c57e7bb/raw/784c5b1bcb06f2a22c55eb4c4f8f83d627cd1ab9/gistfile1.txt Still getting the same warning. But now I have a repro: https://gist.githubusercontent.com/dvyukov/88fdb6d93507b36f81377191b0694f9b/raw/81cc11e8b78b6bbc5cffc79b442ce998c49af226/gistfile1.txt
Interesting. This repro does not trigger the bug on net-next.