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a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=bi6dqmuHe4P4UrxVR6um:22 a=fTW__CHxibyLmBMfj2wP:22 a=mhuot2Qyt4ZrMN8WR7QA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzIwMDA5MSBTYWx0ZWRfX8fB154NwwnaW aGPubL5UIiS0aLV5afp9eN3sZYrpxykPNZ3BLvWjS3JTaTGEw9h8Qxc3soSHM5lhTtBQm+GAd9T b7jO4DHx01umrodvvTHoR6drmSlrc69b9F0zjI24mUVR8cOD5ArH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-20_01,2026-07-17_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 spamscore=0 clxscore=1015 adultscore=0 phishscore=0 priorityscore=1501 impostorscore=0 malwarescore=0 bulkscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607200091 On 7/20/26 15:53, Ido Schimmel wrote: > CAUTION: This email comes from a non Wind River email account! > Do not click links or open attachments unless you recognize the sender and know the content is safe. > > On Mon, Jul 13, 2026 at 11:14:35PM +0800, Yun Zhou wrote: >> 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. > > erspan_xmit() (unlike gre_tap_xmit()) is performing non-atomic > __clear_bit() on shared tunnel flags and KCSAN will probably flag it. > > Eric had a patch [1] that changes erspan_xmit() to use a private copy of > these flags. I think it's better to wait for Eric's patch to be merged > before setting lltx. > > Eric, can you please submit v2 of your patch to net? > > Also, doesn't ip6erspan suffer from the same problem? Please try to > reproduce and fix. > Yes, ip6erspan has the same problem. I will fix it in v3. Thanks, Yun