================================================ WARNING: lock held when returning to user space! 5.5.0-rc6-syzkaller #0 Not tainted ------------------------------------------------ syz-executor.4/949 is leaving the kernel with locks still held! 1 lock held by syz-executor.4/949: #0: ffff8880602d0748 (&tfile->napi_mutex){+.+.}, at: tun_get_user+0x1604/0x3fc0 drivers/net/tun.c:1835