On 7/9/26 16:16, Paolo Abeni wrote:

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On 7/9/26 8:56 AM, Yun Zhou wrote:

quoted

erspan_xmit() re-enters the network stack via ip_tunnel_xmit(), causing
nested acquisition of _xmit_lock on the underlay device while already
holding the ERSPAN device's _xmit_lock. Both are ARPHRD_ETHER and share
the same lockdep class, creating an ABBA deadlock:

   sch_direct_xmit [lock erspan] -> erspan_xmit -> ip_tunnel_xmit ->
   ip_output -> __dev_queue_xmit -> sch_direct_xmit [lock underlay]

Set dev->lltx = true so HARD_TX_LOCK() skips the spinlock for ERSPAN.
This is safe as erspan_xmit() has no shared mutable state: o_seqno is
atomic, stats use atomic_long_inc, and dst_cache is per-CPU. GRETAP,
the sibling device with identical xmit structure, already sets lltx.

Closes: https://syzkaller.appspot.com/bug?extid=9bda1b9fbb7fbdf9b62b
Reported-by: syzbot+9bda1b9fbb7fbdf9b62b@syzkaller.appspotmail.com
Fixes: 84e54fe0a5ea ("gre: introduce native tunnel support for ERSPAN")
Signed-off-by: Yun Zhou <redacted>

So this is actually a v2 of:

20260630183702.170798-2-hemendranaik@gmail.com/20260630183702.170798-2-hemendranaik@gmail.com/

right?

please have a look at:

https://elixir.bootlin.com/linux/v7.1/source/Documentation/process/maintainer-netdev.rst#L434

any kind of re-submission matters, no matter how trivial is the reason.

/P

I sincerely apologize for the duplicate patch submission. It was a minor 
oversight caused by a misconfigured Git in my new environment. However, 
it seems this email was sent to hemendranaik@gmail.com, right?

BR,
Yun