Vlastimil Babka wrote on 8/15/2019 7:32 AM:
Does the issue still happen with rc4? Could you apply the 3 attached
patches (work in progress), configure-enable CONFIG_DEBUG_PAGEALLOC and
CONFIG_PAGE_OWNER and boot kernel with debug_pagealloc=on page_owner=on
parameters? That should print stacktraces of allocation and first
freeing (assuming this is a double free).
Unfortunately -rc4 does not find any my SATA disks due to some
misunderstanding between AHCI driver and HPT642L adapter (there is no
device 07:00.1, HPT is single-function device at 07:00.0):
[ 18.003015] scsi host6: ahci
[ 18.006605] DMAR: DRHD: handling fault status reg 2
[ 18.006619] DMAR: [DMA Write] Request device [07:00.1] fault addr
fffe0000 [fault reason 02] Present bit in context entry is clear
[ 18.076616] DMAR: DRHD: handling fault status reg 102
[ 18.085910] DMAR: [DMA Write] Request device [07:00.1] fault addr
fffa0000 [fault reason 02] Present bit in context entry is clear
[ 18.100989] DMAR: DRHD: handling fault status reg 202
[ 18.110985] DMAR: [DMA Write] Request device [07:00.1] fault addr
fffe0000 [fault reason 02] Present bit in context entry is clear
With iommu=off disks are visible, but USB keyboard (and other USB
devices) does not work:
[ 18.174802] ehci-pci 0000:00:1a.0: swiotlb buffer is full (sz: 8
bytes), total 0 (slots), used 0 (slots)
[ 18.174804] ehci-pci 0000:00:1a.0: overflow 0x0000000ffdc75ae8+8 of
DMA mask ffffffff bus mask 0
[ 18.174815] WARNING: CPU: 2 PID: 508 at kernel/dma/direct.c:35
report_addr+0x2e/0x50
[ 18.174816] Modules linked in:
[ 18.174818] CPU: 2 PID: 508 Comm: kworker/2:1 Tainted: G
T 5.3.0-rc4-64-00058-gd717b092e0b2 #77
[ 18.174819] Hardware name: Dell Inc. Precision T3610/09M8Y8, BIOS A16
02/05/2018
[ 18.174822] Workqueue: usb_hub_wq hub_event
I'll try to find -rc4 configuration that has enabled debugging and can boot.
Petr
