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From: Subrata Modak on 2 Aug 2010 07:00
Hi,

On boot, Badness at lib/dma-debug.c:902, Call Trace & Instruction Dump
are recorded at /var/log/messages:

================================================================
udev: starting version 151
ses 0:8:0:0: Attached Enclosure device
IBM eHEA ethernet device driver (Release EHEA_0105)
mlx4_core: Mellanox ConnectX core driver v0.01 (May 1, 2007)
mlx4_core: Initializing 0002:01:00.0
mlx4_core 0002:01:00.0: enabling device (0140 -> 0142)
ehea: eth0: Jumbo frames are enabled
ehea: eth0 -> logical port id #1
ehea: eth1: Jumbo frames are enabled
ehea: eth1 -> logical port id #2
mlx4_core 0002:01:00.0: Requested 17 vectors, but only 8 MSI-X vectors
available, trying again
mlx4_core 0002:01:00.0: DMA-API: device driver tries to sync DMA memory it has
not allocated [device address=0x0000000060f22000] [size=4096 bytes]
------------[ cut here ]------------
Badness at lib/dma-debug.c:902
NIP: c0000000003fdfa0 LR: c0000000003fdf9c CTR: 0000000000000001
REGS: c000000f35bfad00 TRAP: 0700 Not tainted (2.6.35)
MSR: 8000000000029032 <EE,ME,CE,IR,DR> CR: 48002482 XER: 20000010
TASK = c000000f35c08000[502] 'modprobe' THREAD: c000000f35bf8000 CPU: 8
GPR00: c0000000003fdf9c c000000f35bfaf80 c000000001464c48 0000000000000096
GPR04: 0000000000000001 c0000000000c19b0 0000000000000000 0000000000000002
GPR08: 0000000000000000 c000000f35c08000 00000000000043b3 0000000000000001
GPR12: 7669636520616464 c000000003fa5800 0000000000000000 0000000010016628
GPR16: c000000f32a02000 c000000f32402000 c000000f33604648 c000000f35bfb1c0
GPR20: c000000f38002120 0000000060f22000 0000000000000200 c000000001f4b000
GPR24: 0000000000000001 0000000000000001 c000000001f47900 c000000f35bfb0b0
GPR28: 0000000000000000 c000000f38002120 c0000000013eaea8 c000000f35bfaf80
NIP [c0000000003fdfa0] .check_sync+0x108/0x52c
LR [c0000000003fdf9c] .check_sync+0x104/0x52c
Call Trace:
[c000000f35bfaf80] [c0000000003fdf9c] .check_sync+0x104/0x52c (unreliable)
[c000000f35bfb040] [c0000000003fe8d4] .debug_dma_sync_single_for_cpu+0x58/0x70
[c000000f35bfb150] [d0000000082bdbdc] .mlx4_write_mtt+0x16c/0x290 [mlx4_core]
[c000000f35bfb250] [d0000000082b58c8] .mlx4_create_eq+0x368/0x5a4 [mlx4_core]
[c000000f35bfb350] [d0000000082b5d08] .mlx4_init_eq_table+0x204/0x52c
[mlx4_core]
[c000000f35bfb410] [d0000000082bb5d0] .mlx4_setup_hca+0x1e8/0x6b0 [mlx4_core]
[c000000f35bfb4f0] [d0000000082bc438] .__mlx4_init_one+0x7e8/0xab8 [mlx4_core]
[c000000f35bfb5b0] [d0000000082c2758] .mlx4_init_one+0x70/0x2708 [mlx4_core]
[c000000f35bfb650] [c00000000040afd0] .local_pci_probe+0x4c/0x68
[c000000f35bfb6e0] [c00000000040cb1c] .pci_device_probe+0xfc/0x148
[c000000f35bfb7a0] [c00000000051db68] .driver_probe_device+0x1a8/0x32c
[c000000f35bfb840] [c00000000051dda0] .__driver_attach+0xb4/0xfc
[c000000f35bfb8e0] [c00000000051cbc8] .bus_for_each_dev+0x98/0x108
[c000000f35bfb9a0] [c00000000051d720] .driver_attach+0x40/0x60
[c000000f35bfba30] [c00000000051c048] .bus_add_driver+0x190/0x380
[c000000f35bfbaf0] [c00000000051e310] .driver_register+0xe8/0x1ac
[c000000f35bfbba0] [c00000000040ce6c] .__pci_register_driver+0x88/0x138
[c000000f35bfbc40] [d0000000082c2618] .mlx4_init+0x88/0x100 [mlx4_core]
[c000000f35bfbcd0] [c00000000000a0f4] .do_one_initcall+0xb0/0x208
[c000000f35bfbd80] [c0000000001187e8] .SyS_init_module+0xe8/0x25c
[c000000f35bfbe30] [c000000000008df0] syscall_exit+0x0/0x40
Instruction dump:
48118b09 60000000 e8bd0050 7c641b78 2fa50000 409e0008 e8bd0010 e87e8078
e8fb0030 e8db0028 483ca985 60000000 <0fe00000> 480003b4 e93b0030 e81c0030
================================================================

Kindly note that a similar existing issue
(https://bugzilla.redhat.com/show_bug.cgi?id=579454),
Badness at lib/dma-debug.c:820
was reported here:
http://lists.ozlabs.org/pipermail/linuxppc-dev/2010-April/081541.html
and a fix for the same is also available at:
http://lists.ozlabs.org/pipermail/linuxppc-dev/2010-April/081545.html
and made into the kernel through:
commit a71fa1fc43a29133f13ae6ada1a389ca298c0934

However this pertains to:
Badness at lib/dma-debug.c:902

Regards--
Subrata

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