From: Ma Wupeng <mawupeng1@xxxxxxxxxx> Our test find a WARN_ON in add_to_avail_list. During add_to_avail_list, avail_lists is already in swap_avail_heads, while lead to this WARN_ON. During swapoff, try_to_unuse fail to alloc memory due to memory limit and this lead the failure of swapoff and casing re-insert swap space back into swap_list. During _enable_swap_info, this swap device is added to avail list even this swap device if full. At the same time, one entry in this full swap device in released and try to add this device into avail list and found it is already in the avail list. This cause this WARN_ON. Ma Wupeng (2): swap: Cleanup duplicated WARN_ON in add_to_avail_list swap: Stop add to avail list is swap is full mm/swapfile.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) -- 2.25.1
