Re: linux-next: Tree for Jan 20 -- Kernel panic - Unable to mount root fs

Sabrina Dubroca
2015-01-20T16:56:55Z

Hello,

Today's linux-next doesn't boot on my qemu VM:

[ 1.248357] scsi 0:0:0:0: Direct-Access ATA QEMU HARDDISK 0 PQ: 0 ANSI: 5
[ 1.255899] sd 0:0:0:0: [sda] 8388608 512-byte logical blocks: (4.29 GB/4.00 GiB)
[ 1.258333] sd 0:0:0:0: [sda] Write Protect is off
[ 1.259475] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 1.268417] scsi 1:0:0:0: CD-ROM QEMU QEMU DVD-ROM 2.2. PQ: 0 ANSI: 5
[ 1.271673] sda: sda1
[ 1.281061] sd 0:0:0:0: [sda] Attached SCSI disk
[ 1.282320] VFS: Cannot open root device "sda1" or unknown-block(8,1): error -2
[ 1.283484] Please append a correct "root=" boot option; here are the available partitions:
[ 1.284748] 0100 4096 ram0 (driver?)
[ 1.285479] 0101 4096 ram1 (driver?)
[ 1.286218] 0102 4096 ram2 (driver?)
[ 1.286992] 0103 4096 ram3 (driver?)
[ 1.287741] 0104 4096 ram4 (driver?)
[ 1.288640] 0105 4096 ram5 (driver?)
[ 1.289394] 0106 4096 ram6 (driver?)
[ 1.290195] 0107 4096 ram7 (driver?)
[ 1.290962] 0108 4096 ram8 (driver?)
[ 1.291695] 0109 4096 ram9 (driver?)
[ 1.292404] 010a 4096 ram10 (driver?)
[ 1.293114] 010b 4096 ram11 (driver?)
[ 1.293922] 010c 4096 ram12 (driver?)
[ 1.294643] 010d 4096 ram13 (driver?)
[ 1.295401] 010e 4096 ram14 (driver?)
[ 1.296167] 010f 4096 ram15 (driver?)
[ 1.296975] 0800 4194304 sda driver: sd
[ 1.297697] 0801 4194272 sda1 00000000-01
[ 1.298418] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1)
[ 1.300034] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.19.0-rc5-next-20150120-dirty #410
[ 1.300039] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140617_173321-var-lib-archbuild-testing-x86_64-tobias 04/01/2014
[ 1.300039] ffffea0000001340 ffff88001f673dd8 ffffffff817e1197 000000000000004e
[ 1.300039] ffffffff81a6f2c8 ffff88001f673e58 ffffffff817dfd43 ffffffff81c9a860
[ 1.300039] ffff880000000010 ffff88001f673e68 ffff88001f673e08 ffff000031616473
[ 1.300039] Call Trace:
[ 1.300039] [<ffffffff817e1197>] dump_stack+0x4f/0x7b
[ 1.300039] [<ffffffff817dfd43>] panic+0xd2/0x217
[ 1.300039] [<ffffffff81efd58b>] mount_block_root+0x200/0x28d
[ 1.300039] [<ffffffff81efd78b>] mount_root+0x54/0x58
[ 1.300039] [<ffffffff81efd8f7>] prepare_namespace+0x168/0x1a1
[ 1.300039] [<ffffffff81efd2b1>] kernel_init_freeable+0x29d/0x2ad
[ 1.300039] [<ffffffff817d7440>] ? rest_init+0x140/0x140
[ 1.300039] [<ffffffff817d744e>] kernel_init+0xe/0xf0
[ 1.300039] [<ffffffff817eb87c>] ret_from_fork+0x7c/0xb0
[ 1.300039] [<ffffffff817d7440>] ? rest_init+0x140/0x140
[ 1.300039] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff)
[ 1.300039] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1)

I bisected it down to:

5dc5218840e1 fs: create proper filename objects using getname_kernel()

I reverted then reapplied each part of that patch. It works if I
leave out the hunk for do_path_lookup:

diff --git a/fs/namei.c b/fs/namei.c
index eeb3b83661f8..c3d21b79090e 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2001,9 +2001,15 @@ static int filename_lookup(int dfd, struct filename *name,
static int do_path_lookup(int dfd, const char *name,
unsigned int flags, struct nameidata *nd)
{
- struct filename filename = { .name = name };
+ int retval;
+ struct filename *filename;

- return filename_lookup(dfd, &filename, flags, nd);
+ filename = getname_kernel(name);
+ if (unlikely(IS_ERR(filename)))
+ return PTR_ERR(filename);
+ retval = filename_lookup(dfd, filename, flags, nd);
+ putname(filename);
+ return retval;
}

/* does lookup, returns the object with parent locked */

I don't know what other info you may need.
Full dmesg for the failed boot included below.

Thanks.

[ 0.000000] Initializing cgroup subsys cpuset
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Initializing cgroup subsys cpuacct
[ 0.000000] Linux version 3.19.0-rc5-next-20150120-dirty (zappy@kria) (gcc version 4.9.2 20141224 (prerelease) (GCC) ) #410 SMP PREEMPT Tue Jan 20 17:27:49 CET 2015
[ 0.000000] Command line: root=/dev/sda1 console=ttyS0
[ 0.000000] e820: 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] Hypervisor detected: KVM
[ 0.000000] AGP: No AGP bridge found
[ 0.000000] e820: last_pfn = 0x1ffe0 max_arch_pfn = 0x400000000
[ 0.000000] PAT configuration [0-7]: WB WC UC- UC WB WC UC- UC
[ 0.000000] found SMP MP-table at [mem 0x000f1010-0x000f101f] mapped at [ffff8800000f1010]
[ 0.000000] Scanning 1 areas for low memory corruption
[ 0.000000] init_memory_mapping: [mem 0x00000000-0x000fffff]
[ 0.000000] init_memory_mapping: [mem 0x1fc00000-0x1fdfffff]
[ 0.000000] init_memory_mapping: [mem 0x00100000-0x1fbfffff]
[ 0.000000] init_memory_mapping: [mem 0x1fe00000-0x1ffdffff]
[ 0.000000] ACPI: Early table checksum verification disabled
[ 0.000000] ACPI: RSDP 0x00000000000F0DD0 000014 (v00 BOCHS )
[ 0.000000] ACPI: RSDT 0x000000001FFE18BC 000034 (v01 BOCHS BXPCRSDT 00000001 BXPC 00000001)
[ 0.000000] ACPI: FACP 0x000000001FFE0E48 000074 (v01 BOCHS BXPCFACP 00000001 BXPC 00000001)
[ 0.000000] ACPI: DSDT 0x000000001FFE0040 000E08 (v01 BOCHS BXPCDSDT 00000001 BXPC 00000001)
[ 0.000000] ACPI: FACS 0x000000001FFE0000 000040
[ 0.000000] ACPI: SSDT 0x000000001FFE0EBC 000948 (v01 BOCHS BXPCSSDT 00000001 BXPC 00000001)
[ 0.000000] ACPI: APIC 0x000000001FFE1804 000080 (v01 BOCHS BXPCAPIC 00000001 BXPC 00000001)
[ 0.000000] ACPI: HPET 0x000000001FFE1884 000038 (v01 BOCHS BXPCHPET 00000001 BXPC 00000001)
[ 0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00
[ 0.000000] kvm-clock: cpu 0, msr 0:1ffdf001, primary cpu clock
[ 0.000000] Zone ranges:
[ 0.000000] DMA [mem 0x0000000000001000-0x0000000000ffffff]
[ 0.000000] DMA32 [mem 0x0000000001000000-0x000000001ffdffff]
[ 0.000000] Normal empty
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000001000-0x000000000009efff]
[ 0.000000] node 0: [mem 0x0000000000100000-0x000000001ffdffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x000000001ffdffff]
[ 0.000000] ACPI: PM-Timer IO Port: 0x608
[ 0.000000] ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
[ 0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
[ 0.000000] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
[ 0.000000] ACPI: IOAPIC (id[0x00] address[0xfec00000] gsi_base[0])
[ 0.000000] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
[ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
[ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
[ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
[ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
[ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
[ 0.000000] Using ACPI (MADT) for SMP configuration information
[ 0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000
[ 0.000000] smpboot: Allowing 2 CPUs, 0 hotplug CPUs
[ 0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
[ 0.000000] PM: Registered nosave memory: [mem 0x0009f000-0x0009ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000effff]
[ 0.000000] PM: Registered nosave memory: [mem 0x000f0000-0x000fffff]
[ 0.000000] e820: [mem 0x20000000-0xfeffbfff] available for PCI devices
[ 0.000000] Booting paravirtualized kernel on KVM
[ 0.000000] setup_percpu: NR_CPUS:16 nr_cpumask_bits:16 nr_cpu_ids:2 nr_node_ids:1
[ 0.000000] PERCPU: Embedded 480 pages/cpu @ffff88001f800000 s1927448 r8192 d30440 u2097152
[ 0.000000] KVM setup async PF for cpu 0
[ 0.000000] kvm-stealtime: cpu 0, msr 1f80d480
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 128873
[ 0.000000] Kernel command line: root=/dev/sda1 console=ttyS0
[ 0.000000] PID hash table entries: 2048 (order: 2, 16384 bytes)
[ 0.000000] Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
[ 0.000000] Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
[ 0.000000] xsave: enabled xstate_bv 0x7, cntxt size 0x340 using standard form
[ 0.000000] AGP: Checking aperture...
[ 0.000000] AGP: No AGP bridge found
[ 0.000000] Memory: 474712K/523768K available (8132K kernel code, 1165K rwdata, 3512K rodata, 3448K init, 17440K bss, 49056K reserved, 0K cma-reserved)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
[ 0.000000] Preemptible hierarchical RCU implementation.
[ 0.000000] RCU dyntick-idle grace-period acceleration is enabled.
[ 0.000000] RCU lockdep checking is enabled.
[ 0.000000] RCU restricting CPUs from NR_CPUS=16 to nr_cpu_ids=2.
[ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
[ 0.000000] Running RCU self tests
[ 0.000000] NR_IRQS:4352 nr_irqs:440 16
[ 0.000000] Console: colour VGA+ 80x25
[ 0.000000] console [ttyS0] enabled
[ 0.000000] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
[ 0.000000] ... MAX_LOCKDEP_SUBCLASSES: 8
[ 0.000000] ... MAX_LOCK_DEPTH: 48
[ 0.000000] ... MAX_LOCKDEP_KEYS: 8191
[ 0.000000] ... CLASSHASH_SIZE: 4096
[ 0.000000] ... MAX_LOCKDEP_ENTRIES: 32768
[ 0.000000] ... MAX_LOCKDEP_CHAINS: 65536
[ 0.000000] ... CHAINHASH_SIZE: 32768
[ 0.000000] memory used by lock dependency info: 8671 kB
[ 0.000000] per task-struct memory footprint: 2688 bytes
[ 0.000000] ------------------------
[ 0.000000] | Locking API testsuite:
[ 0.000000] ----------------------------------------------------------------------------
[ 0.000000] | spin |wlock |rlock |mutex | wsem | rsem |
[ 0.000000] --------------------------------------------------------------------------
[ 0.000000] A-A deadlock: ok | ok | ok | ok | ok | ok |
[ 0.000000] A-B-B-A deadlock: ok | ok | ok | ok | ok | ok |
[ 0.000000] A-B-B-C-C-A deadlock: ok | ok | ok | ok | ok | ok |
[ 0.000000] A-B-C-A-B-C deadlock: ok | ok | ok | ok | ok | ok |
[ 0.000000] A-B-B-C-C-D-D-A deadlock: ok | ok | ok | ok | ok | ok |
[ 0.000000] A-B-C-D-B-D-D-A deadlock: ok | ok | ok | ok | ok | ok |
[ 0.000000] A-B-C-D-B-C-D-A deadlock: ok | ok | ok | ok | ok | ok |
[ 0.000000] double unlock: ok | ok | ok | ok | ok | ok |
[ 0.000000] initialize held: ok | ok | ok | ok | ok | ok |
[ 0.000000] bad unlock order: ok | ok | ok | ok | ok | ok |
[ 0.000000] --------------------------------------------------------------------------
[ 0.000000] recursive read-lock: | ok | | ok |
[ 0.000000] recursive read-lock #2: | ok | | ok |
[ 0.000000] mixed read-write-lock: | ok | | ok |
[ 0.000000] mixed write-read-lock: | ok | | ok |
[ 0.000000] --------------------------------------------------------------------------
[ 0.000000] hard-irqs-on + irq-safe-A/12: ok | ok | ok |
[ 0.000000] soft-irqs-on + irq-safe-A/12: ok | ok | ok |
[ 0.000000] hard-irqs-on + irq-safe-A/21: ok | ok | ok |
[ 0.000000] soft-irqs-on + irq-safe-A/21: ok | ok | ok |
[ 0.000000] sirq-safe-A => hirqs-on/12: ok | ok | ok |
[ 0.000000] sirq-safe-A => hirqs-on/21: ok | ok | ok |
[ 0.000000] hard-safe-A + irqs-on/12: ok | ok | ok |
[ 0.000000] soft-safe-A + irqs-on/12: ok | ok | ok |
[ 0.000000] hard-safe-A + irqs-on/21: ok | ok | ok |
[ 0.000000] soft-safe-A + irqs-on/21: ok | ok | ok |
[ 0.000000] hard-safe-A + unsafe-B #1/123: ok | ok | ok |
[ 0.000000] soft-safe-A + unsafe-B #1/123: ok | ok | ok |
[ 0.000000] hard-safe-A + unsafe-B #1/132: ok | ok | ok |
[ 0.000000] soft-safe-A + unsafe-B #1/132: ok | ok | ok |
[ 0.000000] hard-safe-A + unsafe-B #1/213: ok | ok | ok |
[ 0.000000] soft-safe-A + unsafe-B #1/213: ok | ok | ok |
[ 0.000000] hard-safe-A + unsafe-B #1/231: ok | ok | ok |
[ 0.000000] soft-safe-A + unsafe-B #1/231: ok | ok | ok |
[ 0.000000] hard-safe-A + unsafe-B #1/312: ok | ok | ok |
[ 0.000000] soft-safe-A + unsafe-B #1/312: ok | ok | ok |
[ 0.000000] hard-safe-A + unsafe-B #1/321: ok | ok | ok |
[ 0.000000] soft-safe-A + unsafe-B #1/321: ok | ok | ok |
[ 0.000000] hard-safe-A + unsafe-B #2/123: ok | ok | ok |
[ 0.000000] soft-safe-A + unsafe-B #2/123: ok | ok | ok |
[ 0.000000] hard-safe-A + unsafe-B #2/132: ok | ok | ok |
[ 0.000000] soft-safe-A + unsafe-B #2/132: ok | ok | ok |
[ 0.000000] hard-safe-A + unsafe-B #2/213: ok | ok | ok |
[ 0.000000] soft-safe-A + unsafe-B #2/213: ok | ok | ok |
[ 0.000000] hard-safe-A + unsafe-B #2/231: ok | ok | ok |
[ 0.000000] soft-safe-A + unsafe-B #2/231: ok | ok | ok |
[ 0.000000] hard-safe-A + unsafe-B #2/312: ok | ok | ok |
[ 0.000000] soft-safe-A + unsafe-B #2/312: ok | ok | ok |
[ 0.000000] hard-safe-A + unsafe-B #2/321: ok | ok | ok |
[ 0.000000] soft-safe-A + unsafe-B #2/321: ok | ok | ok |
[ 0.000000] hard-irq lock-inversion/123: ok | ok | ok |
[ 0.000000] soft-irq lock-inversion/123: ok | ok | ok |
[ 0.000000] hard-irq lock-inversion/132: ok | ok | ok |
[ 0.000000] soft-irq lock-inversion/132: ok | ok | ok |
[ 0.000000] hard-irq lock-inversion/213: ok | ok | ok |
[ 0.000000] soft-irq lock-inversion/213: ok | ok | ok |
[ 0.000000] hard-irq lock-inversion/231: ok | ok | ok |
[ 0.000000] soft-irq lock-inversion/231: ok | ok | ok |
[ 0.000000] hard-irq lock-inversion/312: ok | ok | ok |
[ 0.000000] soft-irq lock-inversion/312: ok | ok | ok |
[ 0.000000] hard-irq lock-inversion/321: ok | ok | ok |
[ 0.000000] soft-irq lock-inversion/321: ok | ok | ok |
[ 0.000000] hard-irq read-recursion/123: ok |
[ 0.000000] soft-irq read-recursion/123: ok |
[ 0.000000] hard-irq read-recursion/132: ok |
[ 0.000000] soft-irq read-recursion/132: ok |
[ 0.000000] hard-irq read-recursion/213: ok |
[ 0.000000] soft-irq read-recursion/213: ok |
[ 0.000000] hard-irq read-recursion/231: ok |
[ 0.000000] soft-irq read-recursion/231: ok |
[ 0.000000] hard-irq read-recursion/312: ok |
[ 0.000000] soft-irq read-recursion/312: ok |
[ 0.000000] hard-irq read-recursion/321: ok |
[ 0.000000] soft-irq read-recursion/321: ok |
[ 0.000000] --------------------------------------------------------------------------
[ 0.000000] | Wound/wait tests |
[ 0.000000] ---------------------
[ 0.000000] ww api failures: ok | ok | ok |
[ 0.000000] ww contexts mixing: ok | ok |
[ 0.000000] finishing ww context: ok | ok | ok | ok |
[ 0.000000] locking mismatches: ok | ok | ok |
[ 0.000000] EDEADLK handling: ok | ok | ok | ok | ok | ok | ok | ok | ok | ok |
[ 0.000000] spinlock nest unlocked: ok |
[ 0.000000] -----------------------------------------------------
[ 0.000000] |block | try |context|
[ 0.000000] -----------------------------------------------------
[ 0.000000] context: ok | ok | ok |
[ 0.000000] try: ok | ok | ok |
[ 0.000000] block: ok | ok | ok |
[ 0.000000] spinlock: ok | ok | ok |
[ 0.000000] -------------------------------------------------------
[ 0.000000] Good, all 253 testcases passed! |
[ 0.000000] ---------------------------------
[ 0.000000] kmemleak: Kernel memory leak detector disabled
[ 0.000000] kmemleak: Early log buffer exceeded (2228), please increase DEBUG_KMEMLEAK_EARLY_LOG_SIZE
[ 0.000000] tsc: Detected 3303.292 MHz processor
[ 0.006666] Calibrating delay loop (skipped) preset value.. 6609.85 BogoMIPS (lpj=11010973)
[ 0.006666] pid_max: default: 32768 minimum: 301
[ 0.006666] ACPI: Core revision 20141107
[ 0.076988] ACPI: All ACPI Tables successfully acquired
[ 0.077988] Mount-cache hash table entries: 1024 (order: 1, 8192 bytes)
[ 0.078786] Mountpoint-cache hash table entries: 1024 (order: 1, 8192 bytes)
[ 0.081753] Initializing cgroup subsys blkio
[ 0.082252] Initializing cgroup subsys memory
[ 0.082840] Initializing cgroup subsys devices
[ 0.083373] Initializing cgroup subsys freezer
[ 0.083955] Initializing cgroup subsys net_cls
[ 0.084524] Initializing cgroup subsys net_prio
[ 0.085254] mce: CPU supports 10 MCE banks
[ 0.085914] Last level iTLB entries: 4KB 512, 2MB 8, 4MB 8
[ 0.086671] Last level dTLB entries: 4KB 512, 2MB 32, 4MB 32, 1GB 0
[ 0.087727] debug: unmapping init [mem 0xffffffff82083000-0xffffffff82089fff]
[ 0.092658] ftrace: allocating 27092 entries in 106 pages
[ 0.100719] Enabling x2apic
[ 0.101162] Enabled x2apic
[ 0.103341] Switched APIC routing to physical x2apic.
[ 0.105119] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[ 0.105825] smpboot: CPU0: Intel(R) Core(TM) i3-3225 CPU @ 3.30GHz (fam: 06, model: 3a, stepping: 09)
[ 0.107730] Performance Events: 16-deep LBR, IvyBridge events, Intel PMU driver.
[ 0.108868] ... version: 2
[ 0.109434] ... bit width: 48
[ 0.109999] ... generic registers: 4
[ 0.109999] ... value mask: 0000ffffffffffff
[ 0.110006] ... max period: 000000007fffffff
[ 0.110758] ... fixed-purpose events: 3
[ 0.111331] ... event mask: 000000070000000f
[ 0.112681] KVM setup paravirtual spinlock
[ 0.126895] NMI watchdog: disabled (cpu0): hardware events not enabled
[ 0.134087] x86: Booting SMP configuration:
[ 0.135065] .... node #0, CPUs: #1
[ 0.006666] kvm-clock: cpu 1, msr 0:1ffdf041, secondary cpu clock
[ 0.150115] x86: Booted up 1 node, 2 CPUs
[ 0.150112] KVM setup async PF for cpu 1
[ 0.150112] kvm-stealtime: cpu 1, msr 1fa0d480
[ 0.152395] smpboot: Total of 2 processors activated (13218.71 BogoMIPS)
[ 0.154047] devtmpfs: initialized
[ 0.167282] RTC time: 16:27:59, date: 01/20/15
[ 0.169276] NET: Registered protocol family 16
[ 0.183543] cpuidle: using governor ladder
[ 0.196768] cpuidle: using governor menu
[ 0.197725] ACPI: bus type PCI registered
[ 0.198468] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
[ 0.200852] PCI: Using configuration type 1 for base access
[ 0.247130] ACPI: Added _OSI(Module Device)
[ 0.247906] ACPI: Added _OSI(Processor Device)
[ 0.248731] ACPI: Added _OSI(3.0 _SCP Extensions)
[ 0.249602] ACPI: Added _OSI(Processor Aggregator Device)
[ 0.275585] ACPI: Interpreter enabled
[ 0.276227] ACPI Exception: AE_NOT_FOUND, While evaluating Sleep State [\_S1_] (20141107/hwxface-580)
[ 0.277693] ACPI Exception: AE_NOT_FOUND, While evaluating Sleep State [\_S2_] (20141107/hwxface-580)
[ 0.279576] ACPI: (supports S0 S3 S4 S5)
[ 0.280005] ACPI: Using IOAPIC for interrupt routing
[ 0.281178] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug
[ 0.386427] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
[ 0.386704] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI]
[ 0.388165] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM
[ 0.393142] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge.
[ 0.405309] acpiphp: Slot [3] registered
[ 0.406583] acpiphp: Slot [4] registered
[ 0.407098] acpiphp: Slot [5] registered
[ 0.408249] acpiphp: Slot [6] registered
[ 0.409410] acpiphp: Slot [7] registered
[ 0.410417] acpiphp: Slot [8] registered
[ 0.411558] acpiphp: Slot [9] registered
[ 0.412698] acpiphp: Slot [10] registered
[ 0.413745] acpiphp: Slot [11] registered
[ 0.415141] acpiphp: Slot [12] registered
[ 0.416305] acpiphp: Slot [13] registered
[ 0.417085] acpiphp: Slot [14] registered
[ 0.418259] acpiphp: Slot [15] registered
[ 0.419418] acpiphp: Slot [16] registered
[ 0.420418] acpiphp: Slot [17] registered
[ 0.421468] acpiphp: Slot [18] registered
[ 0.422624] acpiphp: Slot [19] registered
[ 0.423748] acpiphp: Slot [20] registered
[ 0.424912] acpiphp: Slot [21] registered
[ 0.426073] acpiphp: Slot [22] registered
[ 0.427086] acpiphp: Slot [23] registered
[ 0.428245] acpiphp: Slot [24] registered
[ 0.429403] acpiphp: Slot [25] registered
[ 0.430415] acpiphp: Slot [26] registered
[ 0.431719] acpiphp: Slot [27] registered
[ 0.432882] acpiphp: Slot [28] registered
[ 0.433747] acpiphp: Slot [29] registered
[ 0.434955] acpiphp: Slot [30] registered
[ 0.436114] acpiphp: Slot [31] registered
[ 0.436693] PCI host bridge to bus 0000:00
[ 0.437478] pci_bus 0000:00: root bus resource [bus 00-ff]
[ 0.438499] pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7]
[ 0.439658] pci_bus 0000:00: root bus resource [io 0x0d00-0xadff]
[ 0.440014] pci_bus 0000:00: root bus resource [io 0xae0f-0xaeff]
[ 0.441158] pci_bus 0000:00: root bus resource [io 0xaf20-0xafdf]
[ 0.442301] pci_bus 0000:00: root bus resource [io 0xafe4-0xffff]
[ 0.443348] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff]
[ 0.444606] pci_bus 0000:00: root bus resource [mem 0x20000000-0xfebfffff]
[ 0.455053] pci 0000:00:01.1: legacy IDE quirk: reg 0x10: [io 0x01f0-0x01f7]
[ 0.455944] pci 0000:00:01.1: legacy IDE quirk: reg 0x14: [io 0x03f6]
[ 0.456673] pci 0000:00:01.1: legacy IDE quirk: reg 0x18: [io 0x0170-0x0177]
[ 0.457478] pci 0000:00:01.1: legacy IDE quirk: reg 0x1c: [io 0x0376]
[ 0.461459] pci 0000:00:01.3: quirk: [io 0x0600-0x063f] claimed by PIIX4 ACPI
[ 0.462321] pci 0000:00:01.3: quirk: [io 0x0700-0x070f] claimed by PIIX4 SMB
[ 0.490885] ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11)
[ 0.493666] ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11)
[ 0.496381] ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11)
[ 0.498853] ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11)
[ 0.500340] ACPI: PCI Interrupt Link [LNKS] (IRQs *9)
[ 0.508149] ACPI: Enabled 16 GPEs in block 00 to 0F
[ 0.509804] vgaarb: setting as boot device: PCI:0000:00:02.0
[ 0.509804] vgaarb: device added: PCI:0000:00:02.0,decodes=io+mem,owns=io+mem,locks=none
[ 0.510019] vgaarb: loaded
[ 0.510540] vgaarb: bridge control possible 0000:00:02.0
[ 0.514298] SCSI subsystem initialized
[ 0.517646] PCI: Using ACPI for IRQ routing
[ 0.522170] HPET: 3 timers in total, 0 timers will be used for per-cpu timer
[ 0.523421] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
[ 0.524428] hpet0: 3 comparators, 64-bit 100.000000 MHz counter
[ 0.528794] Switched to clocksource kvm-clock
[ 0.669271] pnp: PnP ACPI init
[ 0.682044] pnp: PnP ACPI: found 6 devices
[ 0.727112] NET: Registered protocol family 2
[ 0.729045] TCP established hash table entries: 4096 (order: 3, 32768 bytes)
[ 0.730449] TCP bind hash table entries: 4096 (order: 6, 327680 bytes)
[ 0.731884] TCP: Hash tables configured (established 4096 bind 4096)
[ 0.733098] TCP: reno registered
[ 0.733505] UDP hash table entries: 256 (order: 3, 49152 bytes)
[ 0.734248] UDP-Lite hash table entries: 256 (order: 3, 49152 bytes)
[ 0.735538] NET: Registered protocol family 1
[ 0.737119] RPC: Registered named UNIX socket transport module.
[ 0.737885] RPC: Registered udp transport module.
[ 0.738466] RPC: Registered tcp transport module.
[ 0.739041] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.739833] pci 0000:00:00.0: Limiting direct PCI/PCI transfers
[ 0.740752] pci 0000:00:01.0: PIIX3: Enabling Passive Release
[ 0.741476] pci 0000:00:01.0: Activating ISA DMA hang workarounds
[ 0.745661] microcode: CPU0 sig=0x306a9, pf=0x1, revision=0x1
[ 0.746966] microcode: CPU1 sig=0x306a9, pf=0x1, revision=0x1
[ 0.748421] microcode: Microcode Update Driver: v2.00 <tigran@aivazian.fsnet.co.uk>, Peter Oruba
[ 0.749946] Scanning for low memory corruption every 60 seconds
[ 0.755101] futex hash table entries: 512 (order: 4, 65536 bytes)
[ 0.755925] Initialise system trusted keyring
[ 0.756742] audit: initializing netlink subsys (disabled)
[ 0.757523] audit: type=2000 audit(1421771279.698:1): initialized
[ 0.762111] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[ 0.846035] zpool: loaded
[ 0.846398] zbud: loaded
[ 0.854624] VFS: Disk quotas dquot_6.5.2
[ 0.855956] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[ 0.875173] NFS: Registering the id_resolver key type
[ 0.875857] Key type id_resolver registered
[ 0.876384] Key type id_legacy registered
[ 0.876923] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[ 0.877781] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
[ 0.884616] 9p: Installing v9fs 9p2000 file system support
[ 0.888951] Key type asymmetric registered
[ 0.889483] Asymmetric key parser 'x509' registered
[ 0.891038] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
[ 0.892203] io scheduler noop registered
[ 0.892684] io scheduler deadline registered
[ 0.894913] io scheduler cfq registered (default)
[ 0.897956] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
[ 0.899039] pciehp: PCI Express Hot Plug Controller Driver version: 0.4
[ 0.901991] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
[ 0.902956] ACPI: Power Button [PWRF]
[ 0.905511] GHES: HEST is not enabled!
[ 0.907089] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[ 0.932140] 00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[ 0.940679] Linux agpgart interface v0.103
[ 0.942041] [drm] Initialized drm 1.1.0 20060810
[ 0.946934] ram0: unknown partition table
[ 0.949760] ram1: unknown partition table
[ 0.952405] ram2: unknown partition table
[ 0.954952] ram3: unknown partition table
[ 0.957594] ram4: unknown partition table
[ 0.960184] ram5: unknown partition table
[ 0.962753] ram6: unknown partition table
[ 0.965365] ram7: unknown partition table
[ 0.967949] ram8: unknown partition table
[ 0.970591] ram9: unknown partition table
[ 0.973145] ram10: unknown partition table
[ 0.975696] ram11: unknown partition table
[ 0.978270] ram12: unknown partition table
[ 0.980850] ram13: unknown partition table
[ 0.983490] ram14: unknown partition table
[ 0.986062] ram15: unknown partition table
[ 0.987299] brd: module loaded
[ 1.012002] loop: module loaded
[ 1.015014] nbd: registered device at major 43
[ 1.053267] nullb0: unknown partition table
[ 1.056658] nullb1: unknown partition table
[ 1.059039] null: module loaded
[ 1.073543] scsi host0: ata_piix
[ 1.078934] scsi host1: ata_piix
[ 1.081142] ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xc040 irq 14
[ 1.082450] ata2: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xc048 irq 15
[ 1.085557] i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12
[ 1.088762] serio: i8042 KBD port at 0x60,0x64 irq 1
[ 1.090892] serio: i8042 AUX port at 0x60,0x64 irq 12
[ 1.095813] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input1
[ 1.100173] rtc_cmos 00:00: RTC can wake from S4
[ 1.104933] rtc_cmos 00:00: rtc core: registered rtc_cmos as rtc0
[ 1.106306] rtc_cmos 00:00: alarms up to one day, 114 bytes nvram, hpet irqs
[ 1.108350] piix4_smbus 0000:00:01.3: SMBus Host Controller at 0x700, revision 0
[ 1.110844] drop_monitor: Initializing network drop monitor service
[ 1.112385] TCP: cubic registered
[ 1.118817] NET: Registered protocol family 10
[ 1.124642] NET: Registered protocol family 17
[ 1.126381] bridge: automatic filtering via arp/ip/ip6tables has been deprecated. Update your scripts to load br_netfilter if you need this.
[ 1.128949] 8021q: 802.1Q VLAN Support v1.8
[ 1.129825] 9pnet: Installing 9P2000 support
[ 1.130815] Key type dns_resolver registered
[ 1.136875] Loading compiled-in X.509 certificates
[ 1.137907] registered taskstats version 1
[ 1.140583] Magic number: 15:95:490
[ 1.141050] acpi PNP0F13:00: hash matches
[ 1.141650] rtc_cmos 00:00: setting system clock to 2015-01-20 16:28:00 UTC (1421771280)
[ 1.143381] Warning: unable to open an initial console.
[ 1.237994] ata2.00: ATAPI: QEMU DVD-ROM, 2.2.0, max UDMA/100
[ 1.239917] ata1.00: ATA-7: QEMU HARDDISK, 2.2.0, max UDMA/100
[ 1.241219] ata1.00: 8388608 sectors, multi 16: LBA48
[ 1.243389] ata1.00: configured for MWDMA2
[ 1.245792] ata2.00: configured for MWDMA2
[ 1.248357] scsi 0:0:0:0: Direct-Access ATA QEMU HARDDISK 0 PQ: 0 ANSI: 5
[ 1.255899] sd 0:0:0:0: [sda] 8388608 512-byte logical blocks: (4.29 GB/4.00 GiB)
[ 1.258333] sd 0:0:0:0: [sda] Write Protect is off
[ 1.259475] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 1.268417] scsi 1:0:0:0: CD-ROM QEMU QEMU DVD-ROM 2.2. PQ: 0 ANSI: 5
[ 1.271673] sda: sda1
[ 1.281061] sd 0:0:0:0: [sda] Attached SCSI disk
[ 1.282320] VFS: Cannot open root device "sda1" or unknown-block(8,1): error -2
[ 1.283484] Please append a correct "root=" boot option; here are the available partitions:
[ 1.284748] 0100 4096 ram0 (driver?)
[ 1.285479] 0101 4096 ram1 (driver?)
[ 1.286218] 0102 4096 ram2 (driver?)
[ 1.286992] 0103 4096 ram3 (driver?)
[ 1.287741] 0104 4096 ram4 (driver?)
[ 1.288640] 0105 4096 ram5 (driver?)
[ 1.289394] 0106 4096 ram6 (driver?)
[ 1.290195] 0107 4096 ram7 (driver?)
[ 1.290962] 0108 4096 ram8 (driver?)
[ 1.291695] 0109 4096 ram9 (driver?)
[ 1.292404] 010a 4096 ram10 (driver?)
[ 1.293114] 010b 4096 ram11 (driver?)
[ 1.293922] 010c 4096 ram12 (driver?)
[ 1.294643] 010d 4096 ram13 (driver?)
[ 1.295401] 010e 4096 ram14 (driver?)
[ 1.296167] 010f 4096 ram15 (driver?)
[ 1.296975] 0800 4194304 sda driver: sd
[ 1.297697] 0801 4194272 sda1 00000000-01
[ 1.298418] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1)
[ 1.300034] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.19.0-rc5-next-20150120-dirty #410
[ 1.300039] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140617_173321-var-lib-archbuild-testing-x86_64-tobias 04/01/2014
[ 1.300039] ffffea0000001340 ffff88001f673dd8 ffffffff817e1197 000000000000004e
[ 1.300039] ffffffff81a6f2c8 ffff88001f673e58 ffffffff817dfd43 ffffffff81c9a860
[ 1.300039] ffff880000000010 ffff88001f673e68 ffff88001f673e08 ffff000031616473
[ 1.300039] Call Trace:
[ 1.300039] [<ffffffff817e1197>] dump_stack+0x4f/0x7b
[ 1.300039] [<ffffffff817dfd43>] panic+0xd2/0x217
[ 1.300039] [<ffffffff81efd58b>] mount_block_root+0x200/0x28d
[ 1.300039] [<ffffffff81efd78b>] mount_root+0x54/0x58
[ 1.300039] [<ffffffff81efd8f7>] prepare_namespace+0x168/0x1a1
[ 1.300039] [<ffffffff81efd2b1>] kernel_init_freeable+0x29d/0x2ad
[ 1.300039] [<ffffffff817d7440>] ? rest_init+0x140/0x140
[ 1.300039] [<ffffffff817d744e>] kernel_init+0xe/0xf0
[ 1.300039] [<ffffffff817eb87c>] ret_from_fork+0x7c/0xb0
[ 1.300039] [<ffffffff817d7440>] ? rest_init+0x140/0x140
[ 1.300039] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff)
[ 1.300039] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1)

--
Sabrina