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WARNING: lock held when returning to user space!
6.11.0-rc4-syzkaller #0 Not tainted
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syz.0.15/3318 is leaving the kernel with locks still held!
1 lock held by syz.0.15/3318:
 #0: ffffffff83f22c38 (rtnl_mutex){+.+.}-{3:3}, at: ethnl_act_cable_test+0x74/0x170 net/ethtool/cabletest.c:74