The driver may sleep under a write spin lock, and the function call path is: cachefiles_mark_object_active (acquire the lock by write_lock) cachefiles_printk_object kmalloc(GFP_NOIO) --> may sleep cachefiles_mark_object_buried (acquire the lock by write_lock) cachefiles_printk_object kmalloc(GFP_NOIO) --> may sleep To fix it, "GFP_NOIO" is replaced with "GFP_ATOMIC". Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxx> --- fs/cachefiles/namei.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c index 41df8a2..d0f76e7 100644 --- a/fs/cachefiles/namei.c +++ b/fs/cachefiles/namei.c @@ -83,7 +83,7 @@ static noinline void cachefiles_printk_object(struct cachefiles_object *object, { u8 *keybuf; - keybuf = kmalloc(CACHEFILES_KEYBUF_SIZE, GFP_NOIO); + keybuf = kmalloc(CACHEFILES_KEYBUF_SIZE, GFP_ATOMIC); if (object) __cachefiles_printk_object(object, "", keybuf); if (xobject) -- 1.7.9.5 -- Linux-cachefs mailing list Linux-cachefs@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cachefs