The driver may sleep while holding a RCU lock. The function call path (from bottom to top) in Linux-4.17 is:
[FUNC] down drivers/net/.../hinic/hinic_main.c, 775: down in hinic_get_stats64 net/core/dev.c, 8278: [FUNC_PTR]hinic_get_stats64 in dev_get_stats net/core/net-sysfs.c, 568: dev_get_stats in netstat_show net/core/net-sysfs.c, 565: _raw_read_lock in netstat_show Note that [FUNC_PTR] means a function pointer call. This bug is found by my static analysis tool (DSAC-2) and checked by my manual code review. I do not know how to correctly fix this bug, so I just report it. A possible way may be to replace up() and down() with spin_lock() and spin_unlock(). Best wishes, Jia-Ju Bai
