Comment 14 for bug 1955655

As a complement of information, here are the messages pertaining to the TLB during the log :

$ grep -i tlb swiotlb_crash.out
[ 0.003802] software IO TLB: SWIOTLB bounce buffer size adjusted to 1024MB
[ 0.037784] kvm-guest: KVM setup pv remote TLB flush
[ 0.040674] software IO TLB: Cannot allocate buffer
[ 0.229918] Last level iTLB entries: 4KB 512, 2MB 255, 4MB 127
[ 0.230877] Last level dTLB entries: 4KB 512, 2MB 255, 4MB 127, 1GB 0
[ 0.322941] HugeTLB registered 1.00 GiB page size, pre-allocated 0 pages
[ 0.324641] HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages
[ 0.799064] PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
[ 0.800761] software IO TLB: No low mem
[ 1.251773] Kernel panic - not syncing: Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer
[ 1.258821] swiotlb_tbl_map_single.cold+0x57/0x7c
[ 1.259750] swiotlb_map+0x61/0x240
[ 1.289795] ---[ end Kernel panic - not syncing: Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer ]---