With Arnd's script [1] help, I found some bugfixes in Spreadtrum 4.14 product kernel, but missing in v4.14.141:
25a09ce79639 ppp: mppe: Revert "ppp: mppe: Add softdep to arc4" 47d3d7fdb10a ip6: fix skb leak in ip6frag_expire_frag_queue() 5b9cea15a3de serial: sprd: Modify the baud rate calculation formula 513e1073d52e locking/lockdep: Add debug_locks check in __lock_downgrade() 957063c92473 pinctrl: sprd: Use define directive for sprd_pinconf_params values 87a2b65fc855 power: supply: sysfs: ratelimit property read error message
[1] https://lore.kernel.org/lkml/20190322154425.3852517-19-arnd@arndb.de/T/
Changes from v1: - Drop 2 unnecessary patches (patch 1 and patch 4) from v1 patch set. - Add upstream commit id in change log for each stable patch.
David Lechner (1): power: supply: sysfs: ratelimit property read error message
Eric Biggers (1): ppp: mppe: Revert "ppp: mppe: Add softdep to arc4"
Eric Dumazet (1): ip6: fix skb leak in ip6frag_expire_frag_queue()
Lanqing Liu (1): serial: sprd: Modify the baud rate calculation formula
Nathan Chancellor (1): pinctrl: sprd: Use define directive for sprd_pinconf_params values
Waiman Long (1): locking/lockdep: Add debug_locks check in __lock_downgrade()
drivers/net/ppp/ppp_mppe.c | 1 - drivers/pinctrl/sprd/pinctrl-sprd.c | 6 ++---- drivers/power/supply/power_supply_sysfs.c | 3 ++- drivers/tty/serial/sprd_serial.c | 2 +- include/net/ipv6_frag.h | 1 - kernel/locking/lockdep.c | 3 +++ 6 files changed, 8 insertions(+), 8 deletions(-)