Re: [PATCH v3 1/2] dma-contiguous: Abstract dma_{alloc,free}_contiguous()

[Nathan Chancellor <natechancellor@gmail.com>]

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Hi Nicolin,

On Thu, May 23, 2019 at 09:06:32PM -0700, Nicolin Chen wrote:
> Both dma_alloc_from_contiguous() and dma_release_from_contiguous()
> are very simply implemented, but requiring callers to pass certain
> parameters like count and align, and taking a boolean parameter to
> check __GFP_NOWARN in the allocation flags. So every function call
> duplicates similar work:
>   /* A piece of example */
>   unsigned long order = get_order(size);
>   size_t count = size >> PAGE_SHIFT;
>   page = dma_alloc_from_contiguous(dev, count, order, gfp & __GFP_NOWARN);
>   [...]
>   dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT);
> 
> Additionally, as CMA can be used only in the context which permits
> sleeping, most of callers do a gfpflags_allow_blocking() check and
> a corresponding fallback allocation of normal pages upon any false
> result:
>   /* A piece of example */
>   if (gfpflags_allow_blocking(flag))
>       page = dma_alloc_from_contiguous();
>   if (!page)
>       page = alloc_pages();
>   [...]
>   if (!dma_release_from_contiguous(dev, page, count))
>       __free_pages(page, get_order(size));
> 
> So this patch simplifies those function calls by abstracting these
> operations into the two new functions: dma_{alloc,free}_contiguous.
> 
> As some callers of dma_{alloc,release}_from_contiguous() might be
> complicated, this patch just implements these two new functions to
> kernel/dma/direct.c only as an initial step.
> 
> Suggested-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
> ---

This commit is causing boot failures in QEMU on x86_64 defconfig:

https://travis-ci.com/ClangBuiltLinux/continuous-integration/jobs/203825363

Attached is a bisect log and a boot log with GCC (just to show it is not
a compiler thing).

My QEMU command line is:

qemu-system-x86_64 -m 512m \
                   -drive file=images/x86_64/rootfs.ext4,format=raw,if=ide \
                   -append 'console=ttyS0 root=/dev/sda' \
                   -nographic \
                   -kernel arch/x86_64/boot/bzImage

and the rootfs is available here:

https://github.com/ClangBuiltLinux/continuous-integration/raw/master/images/x86_64/rootfs.ext4

I haven't seen a report on this yet so apologize if there is already a
fix in the works. Let me know if you need anythnig from me.

Cheers,
Nathan

[-- Attachment #2: bisect.log --]
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git bisect start
# good: [9fb67d643f6f1892a08ee3a04ea54022d1060bb0] Merge tag 'pinctrl-v5.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
git bisect good 9fb67d643f6f1892a08ee3a04ea54022d1060bb0
# bad: [9a15d2e3fd03e38a6ee7d7bc34d28bb7340f05f2] Add linux-next specific files for 20190529
git bisect bad 9a15d2e3fd03e38a6ee7d7bc34d28bb7340f05f2
# bad: [eb756b9cce06b6c30b478a7ead67ddc0aa52b421] Merge remote-tracking branch 'crypto/master'
git bisect bad eb756b9cce06b6c30b478a7ead67ddc0aa52b421
# bad: [ffd5fc17ee0cd5f90258a8d4e0b87af913943f72] Merge remote-tracking branch 'xtensa/xtensa-for-next'
git bisect bad ffd5fc17ee0cd5f90258a8d4e0b87af913943f72
# bad: [df846fa0031f0e11dbfd5dd7c959cb45b3c0b3e2] Merge remote-tracking branch 'actions/for-next'
git bisect bad df846fa0031f0e11dbfd5dd7c959cb45b3c0b3e2
# good: [673e28ea2b579adcec369cd7f7295142a6b7e017] Merge remote-tracking branch 'usb.current/usb-linus'
git bisect good 673e28ea2b579adcec369cd7f7295142a6b7e017
# good: [d4f1f6efe84b20ff5f3a4874c580c2bee6cba68a] Merge remote-tracking branch 'kvms390-fixes/master'
git bisect good d4f1f6efe84b20ff5f3a4874c580c2bee6cba68a
# bad: [d0756fb0025937a5ed866d27f4452c66b066c089] Merge remote-tracking branch 'dma-mapping/for-next'
git bisect bad d0756fb0025937a5ed866d27f4452c66b066c089
# good: [49af21d0007414838a27eb4ade21277350e8ef1d] Merge remote-tracking branch 'drm-misc-fixes/for-linux-next-fixes'
git bisect good 49af21d0007414838a27eb4ade21277350e8ef1d
# good: [8680aa5a58abfe6087a3d8248c02232d3e05dc80] iommu/dma: Don't remap CMA unnecessarily
git bisect good 8680aa5a58abfe6087a3d8248c02232d3e05dc80
# good: [efd9f10b70689fdeacadc95b6e0ea6dc311fa64f] iommu/dma: Refactor iommu_dma_mmap
git bisect good efd9f10b70689fdeacadc95b6e0ea6dc311fa64f
# good: [b5f75a3639ff3b547e4eee7671e4321a429747a6] arm64: switch copyright boilerplace to SPDX in dma-mapping.c
git bisect good b5f75a3639ff3b547e4eee7671e4321a429747a6
# bad: [fdaeec198ada8c48bff03c85fab542e5b241f5bc] dma-contiguous: add dma_{alloc,free}_contiguous() helpers
git bisect bad fdaeec198ada8c48bff03c85fab542e5b241f5bc
# good: [a84cc69eb53715d37242a21ada398b0d8cd316fc] arm64: trim includes in dma-mapping.c
git bisect good a84cc69eb53715d37242a21ada398b0d8cd316fc
# first bad commit: [fdaeec198ada8c48bff03c85fab542e5b241f5bc] dma-contiguous: add dma_{alloc,free}_contiguous() helpers

[-- Attachment #3: boot.log --]
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^[c^[[?7l^[[2J^[[0mSeaBIOS (version 1.12.0-20181126_142135-anatol)


iPXE (http://ipxe.org) 00:03.0 C980 PCI2.10 PnP PMM+1FF92110+1FEF2110 C980
Press Ctrl-B to configure iPXE (PCI 00:03.0)...\r                                                                               


Booting from ROM..^[c^[[?7l^[[2J^[[0m.\r[    0.000000] Linux version 5.2.0-rc2-next-20190529 (nathan@archlinux-epyc) (gcc version 8.3.0 (GCC)) #1 SMP Wed May 29 11:26:28 MST 2019
[    0.000000] Command line: root=/dev/sda console=ttyS0 
[    0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
[    0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
[    0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
[    0.000000] x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
[    0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format.
[    0.000000] BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000001ffdffff] usable
[    0.000000] BIOS-e820: [mem 0x000000001ffe0000-0x000000001fffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] SMBIOS 2.8 present.
[    0.000000] DMI: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-20181126_142135-anatol 04/01/2014
[    0.000000] tsc: Fast TSC calibration using PIT
[    0.000000] tsc: Detected 1999.996 MHz processor
[    0.001281] last_pfn = 0x1ffe0 max_arch_pfn = 0x400000000
[    0.001327] x86/PAT: Configuration [0-7]: WB  WC  UC- UC  WB  WP  UC- WT  
[    0.003614] found SMP MP-table at [mem 0x000f5cc0-0x000f5ccf]
[    0.003654] check: Scanning 1 areas for low memory corruption
[    0.003674] Using GB pages for direct mapping
[    0.003756] ACPI: Early table checksum verification disabled
[    0.003788] ACPI: RSDP 0x00000000000F5AF0 000014 (v00 BOCHS )
[    0.003793] ACPI: RSDT 0x000000001FFE156F 000030 (v01 BOCHS  BXPCRSDT 00000001 BXPC 00000001)
[    0.003798] ACPI: FACP 0x000000001FFE144B 000074 (v01 BOCHS  BXPCFACP 00000001 BXPC 00000001)
[    0.003802] ACPI: DSDT 0x000000001FFE0040 00140B (v01 BOCHS  BXPCDSDT 00000001 BXPC 00000001)
[    0.003804] ACPI: FACS 0x000000001FFE0000 000040
[    0.003806] ACPI: APIC 0x000000001FFE14BF 000078 (v01 BOCHS  BXPCAPIC 00000001 BXPC 00000001)
[    0.003808] ACPI: HPET 0x000000001FFE1537 000038 (v01 BOCHS  BXPCHPET 00000001 BXPC 00000001)
[    0.004087] No NUMA configuration found
[    0.004088] Faking a node at [mem 0x0000000000000000-0x000000001ffdffff]
[    0.004091] NODE_DATA(0) allocated [mem 0x1ffdc000-0x1ffdffff]
[    0.004328] Zone ranges:
[    0.004330]   DMA      [mem 0x0000000000001000-0x0000000000ffffff]
[    0.004331]   DMA32    [mem 0x0000000001000000-0x000000001ffdffff]
[    0.004332]   Normal   empty
[    0.004332] Movable zone start for each node
[    0.004333] Early memory node ranges
[    0.004334]   node   0: [mem 0x0000000000001000-0x000000000009efff]
[    0.004335]   node   0: [mem 0x0000000000100000-0x000000001ffdffff]
[    0.004612] Zeroed struct page in unavailable ranges: 98 pages
[    0.004613] Initmem setup node 0 [mem 0x0000000000001000-0x000000001ffdffff]
[    0.006924] ACPI: PM-Timer IO Port: 0x608
[    0.006930] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
[    0.006958] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
[    0.006960] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
[    0.006961] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
[    0.006962] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
[    0.006963] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
[    0.006964] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
[    0.006967] Using ACPI (MADT) for SMP configuration information
[    0.006968] ACPI: HPET id: 0x8086a201 base: 0xfed00000
[    0.006974] smpboot: Allowing 1 CPUs, 0 hotplug CPUs
[    0.006982] PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
[    0.006983] PM: Registered nosave memory: [mem 0x0009f000-0x0009ffff]
[    0.006983] PM: Registered nosave memory: [mem 0x000a0000-0x000effff]
[    0.006984] PM: Registered nosave memory: [mem 0x000f0000-0x000fffff]
[    0.006986] [mem 0x20000000-0xfeffbfff] available for PCI devices
[    0.006989] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns
[    0.100715] setup_percpu: NR_CPUS:64 nr_cpumask_bits:64 nr_cpu_ids:1 nr_node_ids:1
[    0.101067] percpu: Embedded 51 pages/cpu s170968 r8192 d29736 u2097152
[    0.101083] node[0] zonelist: 0:DMA32 0:DMA 
[    0.101086] Built 1 zonelists, mobility grouping on.  Total pages: 128873
[    0.101087] Policy zone: DMA32
[    0.101089] Kernel command line: root=/dev/sda console=ttyS0 
[    0.102238] Memory: 486332K/523768K available (14340K kernel code, 1311K rwdata, 3128K rodata, 1308K init, 1276K bss, 37436K reserved, 0K cma-reserved)
[    0.102591] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.102930] rcu: Hierarchical RCU implementation.
[    0.102931] rcu: 	RCU event tracing is enabled.
[    0.102932] rcu: 	RCU restricting CPUs from NR_CPUS=64 to nr_cpu_ids=1.
[    0.102933] rcu: RCU calculated value of scheduler-enlistment delay is 100 jiffies.
[    0.102934] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
[    0.103054] NR_IRQS: 4352, nr_irqs: 256, preallocated irqs: 16
[    0.103367] random: get_random_bytes called from start_kernel+0x2c4/0x498 with crng_init=0
[    0.110098] Console: colour VGA+ 80x25
[    0.176180] printk: console [ttyS0] enabled
[    0.176728] ACPI: Core revision 20190509
[    0.177463] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604467 ns
[    0.178714] APIC: Switch to symmetric I/O mode setup
[    0.180399] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[    0.185697] clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x39a8554e05d, max_idle_ns: 881590540420 ns
[    0.187046] Calibrating delay loop (skipped), value calculated using timer frequency.. 3999.99 BogoMIPS (lpj=1999996)
[    0.188046] pid_max: default: 32768 minimum: 301
[    0.189060] LSM: Security Framework initializing
[    0.189653] SELinux:  Initializing.
[    0.190054] *** VALIDATE SELinux ***
[    0.190556] Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
[    0.191100] Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
[    0.192058] Mount-cache hash table entries: 1024 (order: 1, 8192 bytes)
[    0.193047] Mountpoint-cache hash table entries: 1024 (order: 1, 8192 bytes)
[    0.194137] *** VALIDATE proc ***
[    0.195066] *** VALIDATE cgroup1 ***
[    0.195530] *** VALIDATE cgroup2 ***
[    0.196165] Last level iTLB entries: 4KB 512, 2MB 255, 4MB 127
[    0.197046] Last level dTLB entries: 4KB 512, 2MB 255, 4MB 127, 1GB 0
[    0.197853] Spectre V2 : Mitigation: Full AMD retpoline
[    0.198045] Spectre V2 : Spectre v2 / SpectreRSB mitigation: Filling RSB on context switch
[    0.199046] Spectre V2 : mitigation: Enabling conditional Indirect Branch Prediction Barrier
[    0.200046] Speculative Store Bypass: Mitigation: Speculative Store Bypass disabled via prctl and seccomp
[    0.205525] Freeing SMP alternatives memory: 40K
[    0.206148] smpboot: CPU0: AMD EPYC 7401P 24-Core Processor (family: 0x17, model: 0x1, stepping: 0x2)
[    0.207115] Performance Events: Fam17h core perfctr, AMD PMU driver.
[    0.207932] ... version:                0
[    0.208047] ... bit width:              48
[    0.208573] ... generic registers:      6
[    0.209047] ... value mask:             0000ffffffffffff
[    0.209714] ... max period:             00007fffffffffff
[    0.210046] ... fixed-purpose events:   0
[    0.210556] ... event mask:             000000000000003f
[    0.211077] rcu: Hierarchical SRCU implementation.
[    0.211716] Decoding supported only on Scalable MCA processors.
[    0.212065] smp: Bringing up secondary CPUs ...
[    0.212640] smp: Brought up 1 node, 1 CPU
[    0.213047] smpboot: Max logical packages: 1
[    0.213588] smpboot: Total of 1 processors activated (3999.99 BogoMIPS)
[    0.214176] devtmpfs: initialized
[    0.214753] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275000 ns
[    0.215050] futex hash table entries: 256 (order: 2, 16384 bytes)
[    0.215897] PM: RTC time: 18:27:49, date: 2019-05-29
[    0.216386] NET: Registered protocol family 16
[    0.217012] audit: initializing netlink subsys (disabled)
[    0.217253] cpuidle: using governor menu
[    0.218179] ACPI: bus type PCI registered
[    0.218756] PCI: Using configuration type 1 for base access
[    0.219047] PCI: Using configuration type 1 for extended access
[    0.220053] audit: type=2000 audit(1559154469.038:1): state=initialized audit_enabled=0 res=1
[    0.222328] HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages
[    0.223111] cryptomgr_test (20) used greatest stack depth: 15520 bytes left
[    0.224013] kworker/u2:0 (22) used greatest stack depth: 14664 bytes left
[    0.224111] kworker/u2:0 (26) used greatest stack depth: 14216 bytes left
[    0.225711] ACPI: Added _OSI(Module Device)
[    0.226051] ACPI: Added _OSI(Processor Device)
[    0.226618] ACPI: Added _OSI(3.0 _SCP Extensions)
[    0.227047] ACPI: Added _OSI(Processor Aggregator Device)
[    0.227737] ACPI: Added _OSI(Linux-Dell-Video)
[    0.228071] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
[    0.228741] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
[    0.229545] ACPI: 1 ACPI AML tables successfully acquired and loaded
[    0.231171] ACPI: Interpreter enabled
[    0.231666] ACPI: (supports S0 S3 S4 S5)
[    0.232048] ACPI: Using IOAPIC for interrupt routing
[    0.232683] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug
[    0.233119] ACPI: Enabled 2 GPEs in block 00 to 0F
[    0.235370] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
[    0.236052] acpi PNP0A03:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI HPX-Type3]
[    0.237078] PCI host bridge to bus 0000:00
[    0.237602] pci_bus 0000:00: root bus resource [io  0x0000-0x0cf7 window]
[    0.238048] pci_bus 0000:00: root bus resource [io  0x0d00-0xffff window]
[    0.238942] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window]
[    0.239048] pci_bus 0000:00: root bus resource [mem 0x20000000-0xfebfffff window]
[    0.240014] pci_bus 0000:00: root bus resource [mem 0x100000000-0x17fffffff window]
[    0.240047] pci_bus 0000:00: root bus resource [bus 00-ff]
[    0.240789] pci 0000:00:00.0: [8086:1237] type 00 class 0x060000
[    0.241446] pci 0000:00:01.0: [8086:7000] type 00 class 0x060100
[    0.242459] pci 0000:00:01.1: [8086:7010] type 00 class 0x010180
[    0.244902] pci 0000:00:01.1: reg 0x20: [io  0xc040-0xc04f]
[    0.245838] pci 0000:00:01.1: legacy IDE quirk: reg 0x10: [io  0x01f0-0x01f7]
[    0.246049] pci 0000:00:01.1: legacy IDE quirk: reg 0x14: [io  0x03f6]
[    0.246897] pci 0000:00:01.1: legacy IDE quirk: reg 0x18: [io  0x0170-0x0177]
[    0.247047] pci 0000:00:01.1: legacy IDE quirk: reg 0x1c: [io  0x0376]
[    0.248021] pci 0000:00:01.3: [8086:7113] type 00 class 0x068000
[    0.248360] pci 0000:00:01.3: quirk: [io  0x0600-0x063f] claimed by PIIX4 ACPI
[    0.249053] pci 0000:00:01.3: quirk: [io  0x0700-0x070f] claimed by PIIX4 SMB
[    0.250137] pci 0000:00:02.0: [1234:1111] type 00 class 0x030000
[    0.252059] pci 0000:00:02.0: reg 0x10: [mem 0xfd000000-0xfdffffff pref]
[    0.256072] pci 0000:00:02.0: reg 0x18: [mem 0xfebf0000-0xfebf0fff]
[    0.263058] pci 0000:00:02.0: reg 0x30: [mem 0xfebe0000-0xfebeffff pref]
[    0.264378] pci 0000:00:03.0: [8086:100e] type 00 class 0x020000
[    0.266050] pci 0000:00:03.0: reg 0x10: [mem 0xfebc0000-0xfebdffff]
[    0.268049] pci 0000:00:03.0: reg 0x14: [io  0xc000-0xc03f]
[    0.274058] pci 0000:00:03.0: reg 0x30: [mem 0xfeb80000-0xfebbffff pref]
[    0.276310] ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11)
[    0.277301] ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11)
[    0.278248] ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11)
[    0.279247] ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11)
[    0.280166] ACPI: PCI Interrupt Link [LNKS] (IRQs *9)
[    0.281410] pci 0000:00:02.0: vgaarb: setting as boot VGA device
[    0.282044] pci 0000:00:02.0: vgaarb: VGA device added: decodes=io+mem,owns=io+mem,locks=none
[    0.282056] pci 0000:00:02.0: vgaarb: bridge control possible
[    0.283054] vgaarb: loaded
[    0.284164] SCSI subsystem initialized
[    0.285174] ACPI: bus type USB registered
[    0.286088] usbcore: registered new interface driver usbfs
[    0.287074] usbcore: registered new interface driver hub
[    0.288087] usbcore: registered new device driver usb
[    0.289088] pps_core: LinuxPPS API ver. 1 registered
[    0.290054] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[    0.291064] PTP clock support registered
[    0.292127] EDAC MC: Ver: 3.0.0
[    0.293326] Advanced Linux Sound Architecture Driver Initialized.
[    0.294072] PCI: Using ACPI for IRQ routing
[    0.295369] NetLabel: Initializing
[    0.296052] NetLabel:  domain hash size = 128
[    0.297050] NetLabel:  protocols = UNLABELED CIPSOv4 CALIPSO
[    0.298079] NetLabel:  unlabeled traffic allowed by default
[    0.299200] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
[    0.300053] hpet0: 3 comparators, 64-bit 100.000000 MHz counter
[    0.306070] clocksource: Switched to clocksource tsc-early
[    0.379516] VFS: Disk quotas dquot_6.6.0
[    0.380072] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[    0.380975] *** VALIDATE hugetlbfs ***
[    0.381470] pnp: PnP ACPI init
[    0.382179] pnp: PnP ACPI: found 6 devices
[    0.388273] clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns
[    0.389427] pci_bus 0000:00: resource 4 [io  0x0000-0x0cf7 window]
[    0.390251] pci_bus 0000:00: resource 5 [io  0x0d00-0xffff window]
[    0.391054] pci_bus 0000:00: resource 6 [mem 0x000a0000-0x000bffff window]
[    0.391914] pci_bus 0000:00: resource 7 [mem 0x20000000-0xfebfffff window]
[    0.392777] pci_bus 0000:00: resource 8 [mem 0x100000000-0x17fffffff window]
[    0.393680] NET: Registered protocol family 2
[    0.394330] tcp_listen_portaddr_hash hash table entries: 256 (order: 0, 4096 bytes)
[    0.395302] TCP established hash table entries: 4096 (order: 3, 32768 bytes)
[    0.396246] TCP bind hash table entries: 4096 (order: 4, 65536 bytes)
[    0.397089] TCP: Hash tables configured (established 4096 bind 4096)
[    0.397884] UDP hash table entries: 256 (order: 1, 8192 bytes)
[    0.398624] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[    0.399421] NET: Registered protocol family 1
[    0.400031] RPC: Registered named UNIX socket transport module.
[    0.400773] RPC: Registered udp transport module.
[    0.401367] RPC: Registered tcp transport module.
[    0.401958] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.402824] pci 0000:00:01.0: PIIX3: Enabling Passive Release
[    0.403549] pci 0000:00:00.0: Limiting direct PCI/PCI transfers
[    0.404288] pci 0000:00:01.0: Activating ISA DMA hang workarounds
[    0.405080] pci 0000:00:02.0: Video device with shadowed ROM at [mem 0x000c0000-0x000dffff]
[    0.406129] PCI: CLS 0 bytes, default 64
[    0.406744] check: Scanning for low memory corruption every 60 seconds
[    0.407727] Initialise system trusted keyrings
[    0.408320] workingset: timestamp_bits=56 max_order=17 bucket_order=0
[    0.410320] NFS: Registering the id_resolver key type
[    0.410953] Key type id_resolver registered
[    0.411481] Key type id_legacy registered
[    0.412107] Key type asymmetric registered
[    0.412623] Asymmetric key parser 'x509' registered
[    0.413235] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 251)
[    0.414152] io scheduler mq-deadline registered
[    0.414715] io scheduler kyber registered
[    0.415305] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
[    0.416234] ACPI: Power Button [PWRF]
[    0.416819] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    0.440750] 00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[    0.441978] Non-volatile memory driver v1.3
[    0.442575] Linux agpgart interface v0.103
[    0.444240] loop: module loaded
[    0.444948] ata_piix 0000:00:01.1: failed to start port 0 (errno=-12)
[    0.445938] ata_piix: probe of 0000:00:01.1 failed with error -12
[    0.446748] e100: Intel(R) PRO/100 Network Driver, 3.5.24-k2-NAPI
[    0.447504] e100: Copyright(c) 1999-2006 Intel Corporation
[    0.448196] e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI
[    0.449116] e1000: Copyright (c) 1999-2006 Intel Corporation.
[    0.462026] PCI Interrupt Link [LNKC] enabled at IRQ 11
[    0.764450] e1000 0000:00:03.0 eth0: (PCI:33MHz:32-bit) 52:54:00:12:34:56
[    0.765305] e1000 0000:00:03.0 eth0: Intel(R) PRO/1000 Network Connection
[    0.766192] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
[    0.766955] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[    0.767732] sky2: driver version 1.30
[    0.768275] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    0.769128] ehci-pci: EHCI PCI platform driver
[    0.769710] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    0.770503] ohci-pci: OHCI PCI platform driver
[    0.771081] uhci_hcd: USB Universal Host Controller Interface driver
[    0.771910] usbcore: registered new interface driver usblp
[    0.772628] usbcore: registered new interface driver usb-storage
[    0.773424] i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12
[    0.775080] serio: i8042 KBD port at 0x60,0x64 irq 1
[    0.775729] serio: i8042 AUX port at 0x60,0x64 irq 12
[    0.776961] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input1
[    0.779751] rtc_cmos 00:00: RTC can wake from S4
[    0.780682] rtc_cmos 00:00: registered as rtc0
[    0.781298] rtc_cmos 00:00: alarms up to one day, y3k, 114 bytes nvram, hpet irqs
[    0.782350] device-mapper: ioctl: 4.40.0-ioctl (2019-01-18) initialised: dm-devel@redhat.com
[    0.783478] hidraw: raw HID events driver (C) Jiri Kosina
[    0.784247] usbcore: registered new interface driver usbhid
[    0.784940] usbhid: USB HID core driver
[    0.785877] Initializing XFRM netlink socket
[    0.786497] NET: Registered protocol family 10
[    0.787219] Segment Routing with IPv6
[    0.787713] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
[    0.788537] NET: Registered protocol family 17
[    0.789122] Key type dns_resolver registered
[    0.789708] mce: Using 10 MCE banks
[    0.790165] sched_clock: Marking stable (714371390, 75773427)->(925568491, -135423674)
[    0.791221] registered taskstats version 1
[    0.791733] Loading compiled-in X.509 certificates
[    0.792509] PM:   Magic number: 3:11:495
[    0.793015] printk: console [netcon0] enabled
[    0.793565] netconsole: network logging started
[    0.794166] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[    0.795403] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[    0.796230] ALSA device list:
[    0.796679]   No soundcards found.
[    0.797386] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[    0.798530] cfg80211: failed to load regulatory.db
[    1.380351] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input3
[    1.383202] md: Waiting for all devices to be available before autodetect
[    1.385280] md: If you don't use raid, use raid=noautodetect
[    1.387215] md: Autodetecting RAID arrays.
[    1.388498] md: autorun ...
[    1.389381] md: ... autorun DONE.
[    1.390461] VFS: Cannot open root device "sda" or unknown-block(0,0): error -6
[    1.392649] Please append a correct "root=" boot option; here are the available partitions:
[    1.395141] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[    1.397600] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.2.0-rc2-next-20190529 #1
[    1.399793] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-20181126_142135-anatol 04/01/2014
[    1.402816] Call Trace:
[    1.403577]  dump_stack+0x46/0x60
[    1.404586]  panic+0xf6/0x2b7
[    1.405512]  mount_block_root+0x191/0x23b
[    1.406724]  ? do_early_param+0x89/0x89
[    1.407881]  mount_root+0x10a/0x128
[    1.408952]  prepare_namespace+0x130/0x166
[    1.410195]  kernel_init_freeable+0x1df/0x1ea
[    1.411501]  ? rest_init+0x9a/0x9a
[    1.412533]  kernel_init+0x5/0xf6
[    1.413536]  ret_from_fork+0x22/0x40
[    1.417612] Kernel Offset: 0x800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[    1.420749] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---

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