================================================ WARNING: lock held when returning to user space! 5.5.0-rc7-syzkaller #0 Not tainted ------------------------------------------------ syz-executor.3/8445 is leaving the kernel with locks still held! 1 lock held by syz-executor.3/8445: #0: ffff888099162428 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2897 [inline] #0: ffff888099162428 (sb_writers#3){.+.+}, at: ovl_write_iter+0x859/0x10d0 fs/overlayfs/file.c:345 overlayfs: filesystem on './file0' not supported as upperdir