vmap allocation for size 8192 failed

[charlie_arya]

Hi,

I am running a test application to test the writes/reads to spi based fram on PowerPC MPC8313E based board. I am writing 128K data and reading it back and comparing it. This is done in a while(1) loop. What I observe is that after 650 iterations, the system hangs. When i ran dmesg command i found this:

vmap allocation for size 8192 failed: use vmalloc=<size> to increase size.
Unable to handle kernel paging request for data at address 0x00000000
Faulting instruction address: 0xc027fe4c
Oops: Kernel access of bad area, sig: 11 [#1]
PREEMPT PXM468k
Modules linked in:
NIP: c027fe4c LR: c027fe40 CTR: c021a1cc
REGS: cf9d7e60 TRAP: 0300 Not tainted (2.6.29.2pxm468kcore)
MSR: 00009032 <EE,ME,IR,DR> CR: 24042082 XER: 20000000
DAR: 00000000, DSISR: 20000000
TASK = cf84db20[906] 'e0007000.spi' THREAD: cf9d6000
GPR00: c027fe40 cf9d7f10 cf84db20 00000000 c0659520 cdca9c20 c021ac6c fffffff9
GPR08: c04839e8 c0480000 00000000 00000002 24042082 100eb240 0ffc7fc0 0fd5bf39
GPR16: 00000004 00000024 00000000 00000377 00000001 cf9d6034 cf20d764 cf20d720
GPR24: 00000200 cf9d6000 00000000 cf20d800 00000000 00000001 ccc05e1c ccc05e48
Call Trace:
[cf9d7f10] [c027fe40] 0xc027fe40 (unreliable)
[cf9d7f20] [c0280670] 0xc0280670
[cf9d7f60] [c0035d18] 0xc0035d18
[cf9d7f90] [c0036544] 0xc0036544
[cf9d7fd0] [c003b028] 0xc003b028
[cf9d7ff0] [c0012110] 0xc0012110
Instruction dump:
7c0004ac 914b0020 7c0004ac 900b0020 7d200124 4bd964cd 38800004 38630c08
4bd94925 3d20c049 90697198 3d20c048 <80030000> 5400003c 9009f374 90030000
---[ end trace 26b7d30f34dd75e6 ]---


What this error means and how to remove this error?

[charlie_arya]

Also, I am not allocating memory at every iteration. I have defined 3 arrays of 128Kb each globally and using same array in a while loop.

When I see cat /proc/meminfo before and after running the command, I see following difference and can't think why this is there.

Before

VmallocTotal: 737256 kB
VmallocUsed: 66196 kB
VmallocChunk: 670692 kB


After

VmallocTotal: 737256 kB
VmallocUsed: 401588 kB
VmallocChunk: 8 kB