2.6.34-rc3 : Badness at lib/dma-debug.c:820 during ibmvscsi init

[Sachin Sant]

2.6.34-rc3 boot on a power5 box produces this badness message
during ibmvscsi initialization.

ibmvscsi 30000003: Client reserve enabled
ibmvscsi 30000003: sent SRP login
ibmvscsi 30000003: SRP_LOGIN succeeded
ibmvscsi 30000003: DMA-API: device driver frees DMA memory with wrong function [device address=0x0000000000011520] [size=36 bytes] [mapped as scather-gather] [unmapped as single]
------------[ cut here ]------------
Badness at lib/dma-debug.c:820
NIP: c00000000039bd24 LR: c00000000039bd20 CTR: c0000000000704a4
REGS: c00000000f69f6f0 TRAP: 0700   Tainted: G        W   (2.6.34-rc3)
MSR: 8000000000029032 <EE,ME,CE,IR,DR>  CR: 48000082  XER: 00000004
TASK = c00000000125cc70[0] 'swapper' THREAD: c000000001324000 CPU: 0
GPR00: c00000000039bd20 c00000000f69f970 c000000001322e38 00000000000000b6
GPR04: 0000000000000001 c0000000000c1ea8 0000000000000000 0000000000000002
GPR08: 0000000000000000 c00000000125cc70 0000000000000f66 0000000000000001
GPR12: 0000000000000002 c00000000f669000 0000000000d47940 0000000001c00000
GPR16: ffffffffffffffff 0000000002673148 00000000018ff984 0000000000000006
GPR20: 0000000000000000 c000000000c7bb80 0000000000000000 0000000000000000
GPR24: 0000000000000001 c000000001de6b00 0000000000000001 c000000001de6f80
GPR28: c000000109c696b0 c00000000f69fa90 c0000000012acab0 c00000000f69f970
NIP [c00000000039bd24] .check_unmap+0x3e0/0x784
LR [c00000000039bd20] .check_unmap+0x3dc/0x784
Call Trace:
[c00000000f69f970] [c00000000039bd20] .check_unmap+0x3dc/0x784 (unreliable)
[c00000000f69fa20] [c00000000039c3dc] .debug_dma_unmap_page+0x98/0xc8
[c00000000f69fb60] [d000000001dd63f4] .unmap_cmd_data+0xd0/0x11c [ibmvscsic]
[c00000000f69fc00] [d000000001dd8878] .handle_cmd_rsp+0xe0/0x154 [ibmvscsic]
[c00000000f69fca0] [d000000001dd7694] .ibmvscsi_handle_crq+0x44c/0x500 [ibmvscsic]
[c00000000f69fd40] [d000000001ddaca4] .rpavscsi_task+0x50/0xd8 [ibmvscsic]
[c00000000f69fdf0] [c0000000000c9e84] .tasklet_action+0x108/0x1d4
[c00000000f69fea0] [c0000000000cb778] .__do_softirq+0x168/0x2b8
[c00000000f69ff90] [c0000000000337b0] .call_do_softirq+0x14/0x24
[c000000001327840] [c000000000010664] .do_softirq+0xa0/0x104
[c0000000013278e0] [c0000000000cb0e4] .irq_exit+0x70/0xd0
[c000000001327960] [c00000000000fee4] .do_IRQ+0x214/0x2d8
[c000000001327a20] [c000000000004d28] hardware_interrupt_entry+0x28/0x2c
--- Exception: 501 at .raw_local_irq_restore+0xc0/0xdc
    LR = .cpu_idle+0x12c/0x1d0
[c000000001327d10] [c000000001290a28] mv88e6131_switch_driver+0x8da0/0x35588 (unreliable)
[c000000001327db0] [c000000000017e14] .cpu_idle+0x12c/0x1d0
[c000000001327e50] [c00000000000a71c] .rest_init+0xe8/0x10c
[c000000001327ee0] [c000000000a12e38] .start_kernel+0x4ec/0x510
[c000000001327f90] [c000000000008c64] .start_here_common+0x2c/0x48
Instruction dump:
e81c001a e93d001a e97e8030 78001f24 79291f24 e87e80c0 e8dd0028 e8fd0030
7d0b002a 7d2b482a 48393a49 60000000 <0fe00000> 480000b8 2f800003 409e00f4
Mapped at:
 [<c00000000039c76c>] .debug_dma_map_sg+0xa0/0x220
 [<c0000000005085c4>] .scsi_dma_map+0x120/0x164
 [<d000000001dd8a6c>] .ibmvscsi_queuecommand+0x180/0x5d0 [ibmvscsic]
 [<c0000000004fd9b4>] .scsi_dispatch_cmd+0x21c/0x2cc
 [<c000000000506058>] .scsi_request_fn+0x3cc/0x57c
scsi 0:0:1:0: Direct-Access     AIX      VDASD            0001 PQ: 0 ANSI: 3

I first observed this with latest Fedora builds, and then tried the
same config with rc3 kernel.

Have attached the .config

Thanks
-Sachin


-- 

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
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