phenomenon
The following message appears kernel: pcie04: Card not present on Slot
Investigation process
Which PCIE slot confirmation
lspci -vvvv -s 0000: ac: 00.0 to see what the PCI bus:
To see what equipment it hang down
On the node unusual to see:
/Users/xiaqichao/Library/Caches/BaiduMacHi/Share/images/b0bff8dbfaf54bae1d5888444832e5a7.png
In normal terms with what type of node it mounted equipment
/Users/xiaqichao/Library/Caches/BaiduMacHi/Share/images/ed70cd61114a6c6bba0130617084db6d.png
Make sure it is what equipment
lspci -vvvv -s of: 00.0
You can see this is NVME controller, it is clearly linked to a piece of NVME disk. Later by normal, abnormal node output compare mount / fdisk -l, confirming the abnormality is indeed less a disk node.
to sum up
When we encounter kernel PCIE abnormality information, requires a combination PCIE topology, to target specific PCIE card device, confirm its type, and then confirmed by the command system.