Re: [Bug] [Reiser4] [XEN] PV crash on PV shutdown

[Edward Shishkin <edward.shishkin@gmail.com>]

Hello.

This is incorrect disk space reservation by some process.
What is the "3.15.0-rc3-Miner-dirty"? It could happen that
reiser4 stuff was applied incorrectly...

Thanks,
Edward.


On 05/11/2014 02:42 AM, m@thieu.so wrote:
> Hi, I got a crash when I shutdown a XEN PV guest.
>
> This Funtoo guest is freshly installed and the bug is easy to reproduce.
>  * I have lot of Reiser4 partition on bare metal with the same kernel, 
> no problem
>  * After 3-4 times crashing it, running fsck return no corruption.
>
> to reproduce :
>  - create a Xen PV with a Reiser4 /
>  - issue the command : poweroff
>
> tanith xen # xl create -c metro.pv
> Parsing config from metro.pv
> [    0.000000] Initializing cgroup subsys cpuset
> [    0.000000] Initializing cgroup subsys cpu
> [    0.000000] Linux version 3.15.0-rc3-Miner-dirty (root@tanith) (gcc 
> version 4.7.3 (Gentoo 4.7.3-r1 p1.4, pie-0.5.5) ) #3 SMP PREEMPT Tue 
> Apr 29 22:46:14 CDT 2014
> [    0.000000] Command line: console=hvc0 root=/dev/xvda2
> [    0.000000] KERNEL supported cpus:
> [    0.000000]   AMD AuthenticAMD
> [    0.000000] ACPI in unprivileged domain disabled
> [    0.000000] e820: BIOS-provided physical RAM map:
> [    0.000000] Xen: [mem 0x0000000000000000-0x000000000009ffff] usable
> [    0.000000] Xen: [mem 0x00000000000a0000-0x00000000000fffff] reserved
> [    0.000000] Xen: [mem 0x0000000000100000-0x000000007fffffff] usable
> [    0.000000] NX (Execute Disable) protection: active
> [    0.000000] MPS support code is not built-in.
> [    0.000000] Using acpi=off or acpi=noirq or pci=noacpi may have 
> problem
> [    0.000000] DMI not present or invalid.
> [    0.000000] e820: last_pfn = 0x80000 max_arch_pfn = 0x400000000
> [    0.000000] Scanning 1 areas for low memory corruption
> [    0.000000] init_memory_mapping: [mem 0x00000000-0x000fffff]
> [    0.000000] init_memory_mapping: [mem 0x7fe00000-0x7fffffff]
> [    0.000000] init_memory_mapping: [mem 0x7c000000-0x7fdfffff]
> [    0.000000] init_memory_mapping: [mem 0x00100000-0x7bffffff]
> [    0.000000] NUMA turned off
> [    0.000000] Faking a node at [mem 
> 0x0000000000000000-0x000000007fffffff]
> [    0.000000] Initmem setup node 0 [mem 0x00000000-0x7fffffff]
> [    0.000000]   NODE_DATA [mem 0x7fc0e000-0x7fc18fff]
> [    0.000000] Zone ranges:
> [    0.000000]   DMA      [mem 0x00001000-0x00ffffff]
> [    0.000000]   DMA32    [mem 0x01000000-0xffffffff]
> [    0.000000]   Normal   empty
> [    0.000000] Movable zone start for each node
> [    0.000000] Early memory node ranges
> [    0.000000]   node   0: [mem 0x00001000-0x0009ffff]
> [    0.000000]   node   0: [mem 0x00100000-0x7fffffff]
> [    0.000000] smpboot: Allowing 2 CPUs, 0 hotplug CPUs
> [    0.000000] No local APIC present
> [    0.000000] APIC: disable apic facility
> [    0.000000] APIC: switched to apic NOOP
> [    0.000000] e820: [mem 0x80000000-0xffffffff] available for PCI 
> devices
> [    0.000000] Booting paravirtualized kernel on Xen
> [    0.000000] Xen version: 4.4.0 (preserve-AD)
> [    0.000000] setup_percpu: NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:2 
> nr_node_ids:1
> [    0.000000] PERCPU: Embedded 28 pages/cpu @ffff88007d000000 s83392 
> r8192 d23104 u1048576
> [    0.000000] Built 1 zonelists in Node order, mobility grouping on.  
> Total pages: 515978
> [    0.000000] Policy zone: DMA32
> [    0.000000] Kernel command line: console=hvc0 root=/dev/xvda2
> [    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
> [    0.000000] xsave: enabled xstate_bv 0x7, cntxt size 0x340
> [    0.000000] Memory: 2040644K/2096764K available (5843K kernel code, 
> 589K rwdata, 2168K rodata, 908K init, 2788K bss, 56120K reserved)
> [    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
> [    0.000000] Preemptible hierarchical RCU implementation.
> [    0.000000]  RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=2.
> [    0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, 
> nr_cpu_ids=2
> [    0.000000] NR_IRQS:4352 nr_irqs:288 16 3.15.0-rc3-Miner-dirty
> [    0.000000] xen:events: Using FIFO-based ABI
> [    0.000000] Console: colour dummy device 80x25
> [    0.000000] console [tty0] enabled
> [    0.000000] console [hvc0] enabled
> [    0.000000] installing Xen timer for CPU 0
> [    0.000000] tsc: Detected 3114.152 MHz processor
> [    0.000000] tsc: Marking TSC unstable due to TSCs unsynchronized
> [    0.001000] Calibrating delay loop (skipped), value calculated 
> using timer frequency.. 6228.30 BogoMIPS (lpj=3114152)
> [    0.001000] pid_max: default: 32768 minimum: 301
> [    0.001000] Security Framework initialized
> [    0.001000] Dentry cache hash table entries: 262144 (order: 9, 
> 2097152 bytes)
> [    0.001000] Inode-cache hash table entries: 131072 (order: 8, 
> 1048576 bytes)
> [    0.001205] Mount-cache hash table entries: 4096 (order: 3, 32768 
> bytes)
> [    0.001219] Mountpoint-cache hash table entries: 4096 (order: 3, 
> 32768 bytes)
> [    0.001429] Initializing cgroup subsys freezer
> [    0.001436] Initializing cgroup subsys net_cls
> [    0.001441] Initializing cgroup subsys blkio
> [    0.001488] CPU: Physical Processor ID: 0
> [    0.001493] CPU: Processor Core ID: 5
> [    0.001499] Last level iTLB entries: 4KB 512, 2MB 1024, 4MB 512
> [    0.001499] Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 512, 
> 1GB 0
> [    0.001499] tlb_flushall_shift: 6
> [    0.019675] cpu 0 spinlock event irq 17
> [    0.019982] Performance Events: Fam15h core perfctr,
> [    0.019989] no APIC, boot with the "lapic" boot parameter to 
> force-enable it.
> [    0.019995] no hardware sampling interrupt available.
> [    0.020000] Broken PMU hardware detected, using software events only.
> [    0.020000] Failed to access perfctr msr (MSR c0010201 is 
> ffffaf1b0426)
> [    0.026049] NMI watchdog: disabled (cpu0): hardware events not enabled
> [    0.028084] installing Xen timer for CPU 1
> [    0.028110] cpu 1 spinlock event irq 24
> [    0.028221] SMP alternatives: switching to SMP code
> [    0.045855] x86: Booted up 1 node, 2 CPUs
> [    0.045915] devtmpfs: initialized
> [    0.046076] kworker/u4:0 (21) used greatest stack depth: 6608 bytes 
> left
> [    0.046157] xor: automatically using best checksumming function:
> [    0.055307]    avx       :  6088.000 MB/sec
> [    0.055355] NET: Registered protocol family 16
> [    0.055367] xen:grant_table: Grant tables using version 1 layout
> [    0.055383] Grant table initialized
> [    0.056116] kworker/u4:1 (27) used greatest stack depth: 6504 bytes 
> left
> [    0.056116] kworker/u4:1 (28) used greatest stack depth: 5976 bytes 
> left
> [    0.056243] PCI: setting up Xen PCI frontend stub
> [    0.061325] kworker/u4:1 (60) used greatest stack depth: 5544 bytes 
> left
> [    0.074099] raid6: sse2x1    4992 MB/s
> [    0.091161] raid6: sse2x2    9789 MB/s
> [    0.108221] raid6: sse2x4   11984 MB/s
> [    0.108226] raid6: using algorithm sse2x4 (11984 MB/s)
> [    0.108231] raid6: using ssse3x2 recovery algorithm
> [    0.109001] ACPI: Interpreter disabled.
> [    0.109008] xen:balloon: Initialising balloon driver
> [    0.112059] xen_balloon: Initialising balloon driver
> [    0.113051] vgaarb: loaded
> [    0.113103] SCSI subsystem initialized
> [    0.113172] usbcore: registered new interface driver usbfs
> [    0.113191] usbcore: registered new interface driver hub
> [    0.113220] usbcore: registered new device driver usb
> [    0.113220] PCI: System does not support PCI
> [    0.113220] PCI: System does not support PCI
> [    0.113220] NetLabel: Initializing
> [    0.113220] NetLabel:  domain hash size = 128
> [    0.113220] NetLabel:  protocols = UNLABELED CIPSOv4
> [    0.113220] NetLabel:  unlabeled traffic allowed by default
> [    0.113236] Switched to clocksource xen
> [    0.116033] pnp: PnP ACPI: disabled
> [    0.118721] NET: Registered protocol family 2
> [    0.118847] TCP established hash table entries: 16384 (order: 5, 
> 131072 bytes)
> [    0.118918] TCP bind hash table entries: 16384 (order: 6, 262144 
> bytes)
> [    0.118968] TCP: Hash tables configured (established 16384 bind 16384)
> [    0.118998] TCP: reno registered
> [    0.119009] UDP hash table entries: 1024 (order: 3, 32768 bytes)
> [    0.119026] UDP-Lite hash table entries: 1024 (order: 3, 32768 bytes)
> [    0.119152] platform rtc_cmos: registered platform RTC device (no 
> PNP device found)
> [    0.119240] Scanning for low memory corruption every 60 seconds
> [    0.119358] futex hash table entries: 512 (order: 3, 32768 bytes)
> [    0.119377] audit: initializing netlink subsys (disabled)
> [    0.119390] audit: type=2000 audit(1399767930.035:1): initialized
> [    0.129194] HugeTLB registered 2 MB page size, pre-allocated 0 pages
> [    0.194964] VFS: Disk quotas dquot_6.5.2
> [    0.195013] Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
> [    0.195042] Loading Reiser4. See www.namesys.com for a description 
> of Reiser4.
> [    0.195284] msgmni has been set to 3985
> [    0.195549] Block layer SCSI generic (bsg) driver version 0.4 
> loaded (major 253)
> [    0.195559] io scheduler noop registered
> [    0.195566] io scheduler deadline registered
> [    0.195607] io scheduler cfq registered (default)
> [    0.195934] crc32: CRC_LE_BITS = 64, CRC_BE BITS = 64
> [    0.195941] crc32: self tests passed, processed 225944 bytes in 
> 156546 nsec
> [    0.196094] crc32c: CRC_LE_BITS = 64
> [    0.196100] crc32c: self tests passed, processed 225944 bytes in 
> 68927 nsec
> [    0.414245] crc32_combine: 8373 self tests passed
> [    0.638942] crc32c_combine: 8373 self tests passed
> [    0.639166] xen:xen_evtchn: Event-channel device installed
> [    0.639642] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
> [    0.640072] Linux agpgart interface v0.103
> [    0.641081] loop: module loaded
> [    0.692213] xen_netfront: Initialising Xen virtual ethernet driver
> [    0.720369] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
> [    0.720382] ehci-pci: EHCI PCI platform driver
> [    0.720408] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
> [    0.720419] ohci-pci: OHCI PCI platform driver
> [    0.720496] i8042: PNP: No PS/2 controller found. Probing ports 
> directly.
> [    0.809787] blkfront: xvda: flush diskcache: enabled; persistent 
> grants: enabled; indirect descriptors: enabled;
> [    0.834386]  xvda: xvda1 xvda2
> [    0.848344] blkfront: xvdb: flush diskcache: enabled; persistent 
> grants: enabled; indirect descriptors: enabled;
> [    0.866357]  xvdb: unknown partition table
> [    1.734641] i8042: No controller found
> [    1.734812] mousedev: PS/2 mouse device common for all mice
> [    1.795015] rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0
> [    1.795094] rtc_cmos: probe of rtc_cmos failed with error -38
> [    1.795169] hidraw: raw HID events driver (C) Jiri Kosina
> [    1.795244] usbcore: registered new interface driver usbhid
> [    1.795253] usbhid: USB HID core driver
> [    1.795307] TCP: cubic registered
> [    1.795485] registered taskstats version 1
> [    1.796024] Btrfs loaded
> [    1.796137] console [netcon0] enabled
> [    1.796144] netconsole: network logging started
> [    1.813668] reiser4: xvda2: found disk format 4.0.0.
> [    2.172849] random: nonblocking pool is initialized
> [    4.519997] VFS: Mounted root (reiser4 filesystem) on device 202:2.
> [    4.521323] Freeing unused kernel memory: 908K (ffffffff81a95000 - 
> ffffffff81b78000)
> Broadcast message from root@localhost (hvc0) (Sat May 10 19:29:08 2014):
> The system is going down for system halt NOW!
> INIT: Switching to runlevel: 0
> INIT: Sending processes the TERM signal
> localhost ~ #  * Stopping local
>  [ ok ]
>  * Saving random seed ...
>  [ ok ]
>  * Deactivating additional swap space ...
>  [ ok ]
>  * Stopping sshd ...
>  [ ok ]
>  * Unmounting network filesystems ...
>  [ ok ]
>  * Shutting down network interface lo ...
>  [ ok ]
>  * Network interface eth0 down ...
>  [ ok ]
>  * Unmounting loop devices
>  * Unmounting filesystems
>  *   Unmounting /boot ...
>  [ ok ]
>  * Deactivating swap devices ...
>  [ ok ]
>  * Stopping udevd daemon ...
>  [ ok ]
>  * udev: Device tarball disabled, skipping ...
>  [ ok ]
>  * Terminating remaining processes ...
>  [ ok ]
>  * Killing remaining processes ...
>  [ ok ]
>  * Saving dependency cache ...
>  [ ok ]
>  * Remounting remaining filesystems read-only ...
>  *   Remounting / read only ...
>  [ ok ]
>  [ ok ]
> [   43.548966] ------------[ cut here ]------------
> [   43.548999] kernel BUG at fs/reiser4/block_alloc.c:151!
> [   43.549019] invalid opcode: 0000 [#1] PREEMPT SMP
> [   43.549049] Modules linked in: ipv6 processor thermal_sys 
> crct10dif_pclmul crct10dif_common crc32_pclmul crc32c_intel 
> ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper 
> ablk_helper cryptd microcode unix
> [   43.549067] CPU: 1 PID: 20 Comm: kworker/u4:1 Not tainted 
> 3.15.0-rc3-Miner-dirty #3
> [   43.549067] Workqueue: writeback bdi_writeback_workfn (flush-202:0)
> [   43.549067] task: ffff88007cfc0fe0 ti: ffff88007c41e000 task.ti: 
> ffff88007c41e000
> [   43.549067] RIP: e030:[<ffffffff811e09b4>] [<ffffffff811e09b4>] 
> sub_from_ctx_grabbed.isra.10+0x14/0x20
> [   43.549067] RSP: e02b:ffff88007c41f808  EFLAGS: 00010297
> [   43.549067] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 
> 0000000000002624
> [   43.549067] RDX: 0000000000000001 RSI: 0000000000000001 RDI: 
> ffff88007c47afb0
> [   43.549067] RBP: ffff88007c41f808 R08: 00000000000b5f17 R09: 
> 0000000000000187
> [   43.549067] R10: 0000000000000000 R11: 00000000000061d8 R12: 
> ffff88007c41f898
> [   43.549067] R13: 0000000000000014 R14: ffff88007c47af00 R15: 
> 0000000000000000
> [   43.549067] FS:  00007f609a147700(0000) GS:ffff88007d100000(0000) 
> knlGS:0000000000000000
> [   43.549067] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
> [   43.549067] CR2: 00007f6099c57330 CR3: 000000007b531000 CR4: 
> 0000000000040660
> [   43.549067] Stack:
> [   43.549067]  ffff88007c41f868 ffffffff811e1448 ffff88007c47af00 
> ffff88007c41f890
> [   43.549067]  0000000000000001 ffff88007c43f000 ffff88007c41f868 
> ffff88007c9f7380
> [   43.549067]  ffff88007b629d90 0000000000000000 ffff88007c41f9b8 
> 0000000000000000
> [   43.549067] Call Trace:
> [   43.549067]  [<ffffffff811e1448>] reiser4_alloc_blocks+0xc8/0x280
> [   43.549067]  [<ffffffff811e697f>] allocate_znode_update+0x7f/0x280
> [   43.549067]  [<ffffffff815a95b6>] ? _raw_spin_lock+0x16/0x60
> [   43.549067]  [<ffffffff811d6220>] ? jload_gfp+0x40/0x1c0
> [   43.549067]  [<ffffffff811e6bfa>] allocate_znode+0x7a/0x1c0
> [   43.549067]  [<ffffffff811e8e46>] jnode_flush.constprop.35+0x806/0x9e0
> [   43.549067]  [<ffffffff811e920e>] flush_current_atom+0x1ee/0x3e0
> [   43.549067]  [<ffffffff811e4751>] flush_some_atom+0x111/0x520
> [   43.549067]  [<ffffffff811f3e97>] reiser4_writeout+0xb7/0x1a0
> [   43.549067]  [<ffffffff811f071c>] reiser4_writeback_inodes+0x9c/0x140
> [   43.549067]  [<ffffffff813a35eb>] ? xen_send_IPI_one+0x2b/0x60
> [   43.549067]  [<ffffffff81187a3c>] writeback_sb_inodes+0x9c/0xc0
> [   43.549067]  [<ffffffff81187aff>] __writeback_inodes_wb+0x9f/0xe0
> [   43.549067]  [<ffffffff81187d4b>] wb_writeback+0x20b/0x320
> [   43.549067]  [<ffffffff81187f9a>] bdi_writeback_workfn+0x13a/0x480
> [   43.549067]  [<ffffffff8132f737>] ? debug_smp_processor_id+0x17/0x20
> [   43.549067]  [<ffffffff815a5a18>] ? __schedule+0x2f8/0x760
> [   43.549067]  [<ffffffff8106a258>] process_one_work+0x178/0x460
> [   43.549067]  [<ffffffff8106a9a8>] worker_thread+0x128/0x3a0
> [   43.549067]  [<ffffffff8106a880>] ? rescuer_thread+0x300/0x300
> [   43.549067]  [<ffffffff810717c4>] kthread+0xc4/0xe0
> [   43.549067]  [<ffffffff815a0000>] ? __first_node+0x12/0x1d
> [   43.549067]  [<ffffffff81071700>] ? flush_kthread_worker+0x80/0x80
> [   43.549067]  [<ffffffff815b118c>] ret_from_fork+0x7c/0xb0
> [   43.549067]  [<ffffffff81071700>] ? flush_kthread_worker+0x80/0x80
> [   43.549067] Code: 74 0b 89 f6 5d 48 29 b7 78 01 00 00 c3 0f 0b 0f 
> 1f 84 00 00 00 00 00 48 8b 07 55 48 89 e5 48 39 f0 72 08 48 29 f0 5d 
> 48 89 07 c3 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 54 4c 
> 63 e6
> [   43.549067] RIP  [<ffffffff811e09b4>] 
> sub_from_ctx_grabbed.isra.10+0x14/0x20
> [   43.549067]  RSP <ffff88007c41f808>
> [   43.550576] ---[ end trace c20d37e211566022 ]---
> [   43.550687] BUG: unable to handle kernel paging request at 
> ffffffffffffffd8
> [   43.550722] IP: [<ffffffff8107196c>] kthread_data+0xc/0x20
> [   43.550759] PGD 1a12067 PUD 1a14067 PMD 0
> [   43.550795] Oops: 0000 [#2] PREEMPT SMP
> [   43.550822] Modules linked in: ipv6 processor thermal_sys 
> crct10dif_pclmul crct10dif_common crc32_pclmul crc32c_intel 
> ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper 
> ablk_helper cryptd microcode unix
> [   43.550920] CPU: 1 PID: 20 Comm: kworker/u4:1 Tainted: G D       
> 3.15.0-rc3-Miner-dirty #3
> [   43.550972] task: ffff88007cfc0fe0 ti: ffff88007c41e000 task.ti: 
> ffff88007c41e000
> [   43.550993] RIP: e030:[<ffffffff8107196c>] [<ffffffff8107196c>] 
> kthread_data+0xc/0x20
> [   43.551532] RSP: e02b:ffff88007c41f4a0  EFLAGS: 00010092
> [   43.551532] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 
> 0000000000000008
> [   43.551532] RDX: 0000000000000002 RSI: 0000000000000001 RDI: 
> ffff88007cfc0fe0
> [   43.551532] RBP: ffff88007c41f4b8 R08: 0000000000000001 R09: 
> 000000000000013a
> [   43.551532] R10: 0000000000000000 R11: 0000000000000000 R12: 
> ffff88007d113900
> [   43.551532] R13: 0000000000000001 R14: 0000000000000001 R15: 
> ffff88007cfc0fe0
> [   43.551532] FS:  00007f609a147700(0000) GS:ffff88007d100000(0000) 
> knlGS:0000000000000000
> [   43.551532] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
> [   43.551532] CR2: 0000000000000028 CR3: 000000007b531000 CR4: 
> 0000000000040660
> [   43.551532] Stack:
> [   43.551532]  ffffffff8106b450 ffff88007c41f4b8 ffff88007cfc1418 
> ffff88007c41f538
> [   43.551532]  ffffffff815a5ba0 ffff88007c41f4e8 0000000000000000 
> ffff88007cfc0fe0
> [   43.551532]  0000000000013900 ffff88007c41ffd8 0000000000013900 
> ffff88007b494660
> [   43.551532] Call Trace:
> [   43.551532]  [<ffffffff8106b450>] ? wq_worker_sleeping+0x10/0xa0
> [   43.551532]  [<ffffffff815a5ba0>] __schedule+0x480/0x760
> [   43.551532]  [<ffffffff815a5f04>] schedule+0x24/0x80
> [   43.551532]  [<ffffffff81051e82>] do_exit+0x742/0xb20
> [   43.551532]  [<ffffffff8100c532>] ? check_events+0x12/0x20
> [   43.551532]  [<ffffffff815aa938>] oops_end+0x98/0x140
> [   43.551532]  [<ffffffff81018ea6>] die+0x46/0x80
> [   43.551532]  [<ffffffff815aa1fb>] do_trap+0x5b/0x180
> [   43.551532]  [<ffffffff81015f97>] do_invalid_op+0x97/0xa0
> [   43.551532]  [<ffffffff811e09b4>] ? 
> sub_from_ctx_grabbed.isra.10+0x14/0x20
> [   43.551532]  [<ffffffff8121aeef>] ? 
> bitmap_alloc_forward.constprop.15+0x8f/0xe0
> [   43.551532]  [<ffffffff815b25eb>] invalid_op+0x1b/0x20
> [   43.551532]  [<ffffffff811e09b4>] ? 
> sub_from_ctx_grabbed.isra.10+0x14/0x20
> [   43.551532]  [<ffffffff815a8fb6>] ? _raw_spin_unlock+0x16/0x60
> [   43.551532]  [<ffffffff811e1448>] reiser4_alloc_blocks+0xc8/0x280
> [   43.551532]  [<ffffffff811e697f>] allocate_znode_update+0x7f/0x280
> [   43.551532]  [<ffffffff815a95b6>] ? _raw_spin_lock+0x16/0x60
> [   43.551532]  [<ffffffff811d6220>] ? jload_gfp+0x40/0x1c0
> [   43.551532]  [<ffffffff811e6bfa>] allocate_znode+0x7a/0x1c0
> [   43.551532]  [<ffffffff811e8e46>] jnode_flush.constprop.35+0x806/0x9e0
> [   43.551532]  [<ffffffff811e920e>] flush_current_atom+0x1ee/0x3e0
> [   43.551532]  [<ffffffff811e4751>] flush_some_atom+0x111/0x520
> [   43.551532]  [<ffffffff811f3e97>] reiser4_writeout+0xb7/0x1a0
> [   43.551532]  [<ffffffff811f071c>] reiser4_writeback_inodes+0x9c/0x140
> [   43.551532]  [<ffffffff813a35eb>] ? xen_send_IPI_one+0x2b/0x60
> [   43.551532]  [<ffffffff81187a3c>] writeback_sb_inodes+0x9c/0xc0
> [   43.551532]  [<ffffffff81187aff>] __writeback_inodes_wb+0x9f/0xe0
> [   43.551532]  [<ffffffff81187d4b>] wb_writeback+0x20b/0x320
> [   43.551532]  [<ffffffff81187f9a>] bdi_writeback_workfn+0x13a/0x480
> [   43.551532]  [<ffffffff8132f737>] ? debug_smp_processor_id+0x17/0x20
> [   43.551532]  [<ffffffff815a5a18>] ? __schedule+0x2f8/0x760
> [   43.551532]  [<ffffffff8106a258>] process_one_work+0x178/0x460
> [   43.551532]  [<ffffffff8106a9a8>] worker_thread+0x128/0x3a0
> [   43.551532]  [<ffffffff8106a880>] ? rescuer_thread+0x300/0x300
> [   43.551532]  [<ffffffff810717c4>] kthread+0xc4/0xe0
> [   43.551532]  [<ffffffff815a0000>] ? __first_node+0x12/0x1d
> [   43.551532]  [<ffffffff81071700>] ? flush_kthread_worker+0x80/0x80
> [   43.551532]  [<ffffffff815b118c>] ret_from_fork+0x7c/0xb0
> [   43.551532]  [<ffffffff81071700>] ? flush_kthread_worker+0x80/0x80
> [   43.551532] Code: 90 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 
> 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 48 8b 87 e0 03 00 00 55 
> 48 89 e5 5d <48> 8b 40 d8 c3 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 
> 00 55
> [   43.551532] RIP  [<ffffffff8107196c>] kthread_data+0xc/0x20
> [   43.551532]  RSP <ffff88007c41f4a0>
> [   43.551532] CR2: ffffffffffffffd8
> [   43.551532] ---[ end trace c20d37e211566023 ]---
> [   43.551532] Fixing recursive fault but reboot is needed!
> [   43.551532] BUG: scheduling while atomic: kworker/u4:1/20/0x00000004
> [   43.551532] Modules linked in: ipv6 processor thermal_sys 
> crct10dif_pclmul crct10dif_common crc32_pclmul crc32c_intel 
> ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper 
> ablk_helper cryptd microcode unix
> [   43.551532] Preemption disabled at:[<ffffffff815aa938>] 
> oops_end+0x98/0x140
> [   43.551532]
> [   43.551532] CPU: 1 PID: 20 Comm: kworker/u4:1 Tainted: G D       
> 3.15.0-rc3-Miner-dirty #3
> [   43.551532]  ffff88007d113900 ffff88007c41f088 ffffffff815a3a26 
> 0000000000000005
> [   43.551532]  0000000000000009 ffff88007c41f098 ffffffff815a04bf 
> ffff88007c41f118
> [   43.551532]  ffffffff815a5e4a ffff88007c41f3f8 0000000000000000 
> ffff88007cfc0fe0
> [   43.551532] Call Trace:
> [   43.551532]  [<ffffffff815a3a26>] dump_stack+0x4f/0x7c
> [   43.551532]  [<ffffffff815a04bf>] __schedule_bug+0x9a/0xa8
> [   43.551532]  [<ffffffff815a5e4a>] __schedule+0x72a/0x760
> [   43.551532]  [<ffffffff815a5f04>] schedule+0x24/0x80
> [   43.551532]  [<ffffffff8105219e>] do_exit+0xa5e/0xb20
> [   43.551532]  [<ffffffff815a0711>] ? printk+0x48/0x4a
> [   43.551532]  [<ffffffff81097119>] ? kmsg_dump+0xb9/0xe0
> [   43.551532]  [<ffffffff815aa938>] oops_end+0x98/0x140
> [   43.551532]  [<ffffffff8159fbf2>] no_context+0x28c/0x2b7
> [   43.551532]  [<ffffffff8100b3a9>] ? xen_pud_val+0x9/0x20
> [   43.551532]  [<ffffffff8159fdd8>] __bad_area_nosemaphore+0x1bb/0x1da
> [   43.551532]  [<ffffffff8159fe05>] bad_area_nosemaphore+0xe/0x10
> [   43.551532]  [<ffffffff815ace60>] __do_page_fault+0x3a0/0x4a0
> [   43.551532]  [<ffffffff8107cb65>] ? check_preempt_curr+0x85/0xa0
> [   43.551532]  [<ffffffff8107cb98>] ? ttwu_do_wakeup+0x18/0x100
> [   43.551532]  [<ffffffff815a94c8>] ? 
> _raw_spin_unlock_irqrestore+0x28/0x80
> [   43.551532]  [<ffffffff8107ffd5>] ? try_to_wake_up+0x1b5/0x280
> [   43.551532]  [<ffffffff81322eea>] ? vsnprintf+0x3ca/0x560
> [   43.551532]  [<ffffffff815acf82>] do_page_fault+0x22/0x40
> [   43.551532]  [<ffffffff815a9dd5>] page_fault+0x25/0x30
> [   43.551532]  [<ffffffff8107196c>] ? kthread_data+0xc/0x20
> [   43.551532]  [<ffffffff8106b450>] ? wq_worker_sleeping+0x10/0xa0
> [   43.551532]  [<ffffffff815a5ba0>] __schedule+0x480/0x760
> [   43.551532]  [<ffffffff815a5f04>] schedule+0x24/0x80
> [   43.551532]  [<ffffffff81051e82>] do_exit+0x742/0xb20
> [   43.551532]  [<ffffffff8100c532>] ? check_events+0x12/0x20
> [   43.551532]  [<ffffffff815aa938>] oops_end+0x98/0x140
> [   43.551532]  [<ffffffff81018ea6>] die+0x46/0x80
> [   43.551532]  [<ffffffff815aa1fb>] do_trap+0x5b/0x180
> [   43.551532]  [<ffffffff81015f97>] do_invalid_op+0x97/0xa0
> [   43.551532]  [<ffffffff811e09b4>] ? 
> sub_from_ctx_grabbed.isra.10+0x14/0x20
> [   43.551532]  [<ffffffff8121aeef>] ? 
> bitmap_alloc_forward.constprop.15+0x8f/0xe0
> [   43.551532]  [<ffffffff815b25eb>] invalid_op+0x1b/0x20
> [   43.551532]  [<ffffffff811e09b4>] ? 
> sub_from_ctx_grabbed.isra.10+0x14/0x20
> [   43.551532]  [<ffffffff815a8fb6>] ? _raw_spin_unlock+0x16/0x60
> [   43.551532]  [<ffffffff811e1448>] reiser4_alloc_blocks+0xc8/0x280
> [   43.551532]  [<ffffffff811e697f>] allocate_znode_update+0x7f/0x280
> [   43.551532]  [<ffffffff815a95b6>] ? _raw_spin_lock+0x16/0x60
> [   43.551532]  [<ffffffff811d6220>] ? jload_gfp+0x40/0x1c0
> [   43.551532]  [<ffffffff811e6bfa>] allocate_znode+0x7a/0x1c0
> [   43.551532]  [<ffffffff811e8e46>] jnode_flush.constprop.35+0x806/0x9e0
> [   43.551532]  [<ffffffff811e920e>] flush_current_atom+0x1ee/0x3e0
> [   43.551532]  [<ffffffff811e4751>] flush_some_atom+0x111/0x520
> [   43.551532]  [<ffffffff811f3e97>] reiser4_writeout+0xb7/0x1a0
> [   43.551532]  [<ffffffff811f071c>] reiser4_writeback_inodes+0x9c/0x140
> [   43.551532]  [<ffffffff813a35eb>] ? xen_send_IPI_one+0x2b/0x60
> [   43.551532]  [<ffffffff81187a3c>] writeback_sb_inodes+0x9c/0xc0
> [   43.551532]  [<ffffffff81187aff>] __writeback_inodes_wb+0x9f/0xe0
> [   43.551532]  [<ffffffff81187d4b>] wb_writeback+0x20b/0x320
> [   43.551532]  [<ffffffff81187f9a>] bdi_writeback_workfn+0x13a/0x480
> [   43.551532]  [<ffffffff8132f737>] ? debug_smp_processor_id+0x17/0x20
> [   43.551532]  [<ffffffff815a5a18>] ? __schedule+0x2f8/0x760
> [   43.551532]  [<ffffffff8106a258>] process_one_work+0x178/0x460
> [   43.551532]  [<ffffffff8106a9a8>] worker_thread+0x128/0x3a0
> [   43.551532]  [<ffffffff8106a880>] ? rescuer_thread+0x300/0x300
> [   43.551532]  [<ffffffff810717c4>] kthread+0xc4/0xe0
> [   43.551532]  [<ffffffff815a0000>] ? __first_node+0x12/0x1d
> [   43.551532]  [<ffffffff81071700>] ? flush_kthread_worker+0x80/0x80
> [   43.551532]  [<ffffffff815b118c>] ret_from_fork+0x7c/0xb0
> [   43.551532]  [<ffffffff81071700>] ? flush_kthread_worker+0x80/0x80
> tanith xen # fsck.reiser4 /dev/mapper/XenVolG-metro2 --fix
> *******************************************************************
> This is an EXPERIMENTAL version of fsck.reiser4. Read README first.
> *******************************************************************
>
> Fscking the /dev/mapper/XenVolG-metro2 block device.
> Will fix minor corruptions of the Reiser4 SuperBlock.
> Will fix minor corruptions of the Reiser4 FileSystem.
> Continue?
> (Yes/No): Yes
> ***** fsck.reiser4 started at Sat May 10 19:30:46 2014
> Reiser4 fs was detected on /dev/mapper/XenVolG-metro2.
> Master super block (16):
> magic:          ReIsEr4
> blksize:        4096
> format:         0x0 (format40)
> uuid:           83dd3b1c-1a24-4420-9c83-3fbd2748ad9d
> label:          <none>
>
> Format super block (17):
> plugin:         format40
> description:    Disk-format plugin.
> version:        0
> magic:          ReIsEr40FoRmAt
> mkfs id:        0x605ab6a1
> flushes:        0
> blocks:         10477312
> free blocks:    9934667
> root block:     184145
> tail policy:    0x2 (smart)
> next oid:       0x43a76
> file count:     208559
> tree height:    4
> key policy:     LARGE
>
>
> CHECKING THE STORAGE TREE
>         Read nodes 78712
>         Nodes left in the tree 78712
>                 Leaves of them 77684, Twigs of them 1012
>         Time interval: Sat May 10 19:30:50 2014 - Sat May 10 19:31:08 
> 2014
> CHECKING EXTENT REGIONS.
>         Read twigs 1012
>         Time interval: Sat May 10 19:31:08 2014 - Sat May 10 19:31:08 
> 2014
> CHECKING THE SEMANTIC TREE
>         Found 209015 objects (some could be encountered more then once).
>         Time interval: Sat May 10 19:31:08 2014 - Sat May 10 19:31:11 
> 2014
> ***** fsck.reiser4 finished at Sat May 10 19:31:11 2014
> Closing fs...done
>
> FS is consistent.
>
> tanith xen #
>
>
> -- 
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