================================================ WARNING: lock held when returning to user space! 5.6.0-rc2-next-20200224-syzkaller #0 Not tainted ------------------------------------------------ syz-executor184/10029 is leaving the kernel with locks still held! 1 lock held by syz-executor184/10029: #0: ffff88809987c418 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2903 [inline] #0: ffff88809987c418 (sb_writers#3){.+.+}, at: ovl_write_iter+0xcc1/0x1090 fs/overlayfs/file.c:348