BUG: spinlock bad magic on CPU#0 on BeagleBone

[Bedia, Vaibhav]

Hi,

Current mainline on Beaglebone using the omap2plus_defconfig + 3 build fixes
is triggering a BUG()

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 3.7.0-01415-g55bc169 (a0393953 at psplinux063) (gcc version 4.5.3 20110311 (prerelease) (GCC) ) #1 SMP Wed Dec 19 13:40:13 IST 2012
[    0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] Machine: Generic AM33XX (Flattened Device Tree), model: TI AM335x BeagleBone
[    0.000000] Memory policy: ECC disabled, Data cache writeback
[    0.000000] On node 0 totalpages: 65280
[    0.000000] free_area_init_node: node 0, pgdat c07b3680, node_mem_map c0d11000
[    0.000000]   Normal zone: 512 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 64768 pages, LIFO batch:15
[    0.000000] AM335X ES1.0 (neon )
[    0.000000] PERCPU: Embedded 9 pages/cpu @c0f1a000 s12992 r8192 d15680 u36864
[    0.000000] pcpu-alloc: s12992 r8192 d15680 u36864 alloc=9*4096
[    0.000000] pcpu-alloc: [0] 0
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 64768
[    0.000000] Kernel command line: console=ttyO0,115200n8 mem=256M root=/dev/ram rw initrd=0x82000000,16MB ramdisk_size=65536 earlyprintk=serial
[    0.000000] PID hash table entries: 1024 (order: 0, 4096 bytes)
[    0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
[    0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
[    0.000000] __ex_table already sorted, skipping sort
[    0.000000] Memory: 255MB = 255MB total
[    0.000000] Memory: 229012k/229012k available, 33132k reserved, 0K highmem
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
[    0.000000]     vmalloc : 0xd0800000 - 0xff000000   ( 744 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)
[    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
[    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
[    0.000000]       .text : 0xc0008000 - 0xc06d3f3c   (6960 kB)
[    0.000000]       .init : 0xc06d4000 - 0xc07252c0   ( 325 kB)
[    0.000000]       .data : 0xc0726000 - 0xc07b6068   ( 577 kB)
[    0.000000]        .bss : 0xc07b608c - 0xc0d10af0   (5483 kB)
[    0.000000] Hierarchical RCU implementation.
[    0.000000]  RCU restricting CPUs from NR_CPUS=2 to nr_cpu_ids=1.
[    0.000000] NR_IRQS:16 nr_irqs:16 16
[    0.000000] IRQ: Found an INTC at 0xfa200000 (revision 5.0) with 128 interrupts
[    0.000000] Total of 128 interrupts on 1 active controller
[    0.000000] OMAP clockevent source: GPTIMER1 at 24000000 Hz
[    0.000000] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956ms
[    0.000000] OMAP clocksource: GPTIMER2 at 24000000 Hz
[    0.000000] Console: colour dummy device 80x30
[    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:     16384
[    0.000000] ... MAX_LOCKDEP_CHAINS:      32768
[    0.000000] ... CHAINHASH_SIZE:          16384
[    0.000000]  memory used by lock dependency info: 3695 kB
[    0.000000]  per task-struct memory footprint: 1152 bytes
[    0.001227] Calibrating delay loop... 364.48 BogoMIPS (lpj=1425408)
[    0.109084] pid_max: default: 32768 minimum: 301
[    0.109688] Security Framework initialized
[    0.109889] Mount-cache hash table entries: 512
[    0.112674] BUG: spinlock bad magic on CPU#0, swapper/0/0
[    0.112724]  lock: atomic64_lock+0x240/0x400, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
[    0.112782] [<c001af64>] (unwind_backtrace+0x0/0xf0) from [<c02c2010>] (do_raw_spin_lock+0x158/0x198)
[    0.112813] [<c02c2010>] (do_raw_spin_lock+0x158/0x198) from [<c04d89ec>] (_raw_spin_lock_irqsave+0x4c/0x58)
[    0.112844] [<c04d89ec>] (_raw_spin_lock_irqsave+0x4c/0x58) from [<c02cabf0>] (atomic64_add_return+0x30/0x5c)
[    0.112886] [<c02cabf0>] (atomic64_add_return+0x30/0x5c) from [<c0124564>] (alloc_mnt_ns.clone.14+0x44/0xac)
[    0.112914] [<c0124564>] (alloc_mnt_ns.clone.14+0x44/0xac) from [<c0124f4c>] (create_mnt_ns+0xc/0x54)
[    0.112951] [<c0124f4c>] (create_mnt_ns+0xc/0x54) from [<c06f31a4>] (mnt_init+0x120/0x1d4)
[    0.112978] [<c06f31a4>] (mnt_init+0x120/0x1d4) from [<c06f2d50>] (vfs_caches_init+0xe0/0x10c)
[    0.113005] [<c06f2d50>] (vfs_caches_init+0xe0/0x10c) from [<c06d4798>] (start_kernel+0x29c/0x300)
[    0.113029] [<c06d4798>] (start_kernel+0x29c/0x300) from [<80008078>] (0x80008078)
[    0.118290] CPU: Testing write buffer coherency: ok
[    0.118968] CPU0: thread -1, cpu 0, socket -1, mpidr 0
[    0.119053] Setting up static identity map for 0x804de2c8 - 0x804de338
[    0.120698] Brought up 1 CPUs
[...]

Regards,
Vaibhav