The culprit for the 256 33 page allocations (that causes the fragmentation mentioned in comment #8) is the hisi_sas_v3_hw driver:
[ 21.220867] Call trace: [ 21.223301] dump_backtrace+0x0/0x1b0 [ 21.226948] show_stack+0x24/0x30 [ 21.230251] dump_stack+0x90/0xb4 [ 21.233554] cma_alloc+0x3f4/0x430 [ 21.236942] dma_alloc_from_contiguous+0x70/0x80 [ 21.241544] __dma_direct_alloc_pages+0x14c/0x228 [ 21.246234] dma_direct_alloc_pages+0x48/0xc0 [ 21.250576] dma_direct_alloc+0x50/0x80 [ 21.254397] dma_alloc_attrs+0x94/0x128 [ 21.258218] dmam_alloc_attrs+0x68/0xb8 [ 21.262043] hisi_sas_alloc+0x360/0x538 [hisi_sas_main] [ 21.267257] hisi_sas_shost_alloc_pci+0xfc/0x170 [hisi_sas_v3_hw] [ 21.273337] hisi_sas_v3_probe+0xd8/0x360 [hisi_sas_v3_hw] [ 21.278810] local_pci_probe+0x44/0xa8 [ 21.282544] work_for_cpu_fn+0x20/0x30 [ 21.286279] process_one_work+0x1f0/0x430 [ 21.290274] worker_thread+0x248/0x488 [ 21.294009] kthread+0x134/0x138 [ 21.297223] ret_from_fork+0x10/0x18 I wonder if it'd be possible to adjust this allocation somehow. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1823753 Title: arm64: cma_alloc errors at boot Status in linux package in Ubuntu: Confirmed Bug description: On some arm64 systems[*] we are seeing a spew of messages on the console: [ 19.534097] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12 [ 19.534109] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12 [ 19.534113] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12 [ 19.534126] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12 [ 19.534130] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12 [ 19.534142] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12 [ 19.534146] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12 [ 19.534157] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12 [ 19.534161] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12 [ 19.534173] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12 [ 19.534177] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12 This appears to be non-fatal - impacted systems all eventually boot. But, at least in the case of the HP m400, it slows down boot enough that MAAS' default timeout will expire before completing deployment. [*] Observed on a HiSilicon D06 w/ SMMU disabled in the BIOS, as well as an HP m400 (APM X-Gene) cartridge - although, not on another one that - in theory - should be identical. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1823753/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
