Re: Data corruption in kernel 5.1+ with iSER attached ramdisk

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi,

Another datapoint.

I enabled "isert_debug" tracing and re-ran the test. Here is a small
snippet of the debug data. FWIW, the "length of 76" in the "lkey
mismatch" is a pattern that repeats quite often during the exchange.


Dec 03 03:41:12 host-2 kernel: isert: isert_recv_done: DMA:
0x10a6457000, iSCSI opcode: 0x01, ITT: 0x00000023, flags: 0x81 dlen: 0
Dec 03 03:41:12 host-2 kernel: isert: isert_recv_done: ISER ISCSI_CTRL PDU
Dec 03 03:41:12 host-2 kernel: isert: __isert_create_send_desc:
tx_desc 000000009bbe54ca lkey mismatch, fixing
Dec 03 03:41:12 host-2 kernel: isert: isert_init_tx_hdrs: Setup
tx_sg[0].addr: 0x4ce45010 length: 76 lkey: 0x80480
Dec 03 03:41:12 host-2 kernel: isert: isert_put_response: Posting SCSI Response
Dec 03 03:41:12 host-2 kernel: isert: isert_send_done: Cmd 00000000238f9047
Dec 03 03:41:12 host-2 kernel: isert: isert_unmap_tx_desc: unmap
single for tx_desc->dma_addr
Dec 03 03:41:12 host-2 kernel: isert: isert_put_cmd: Cmd 00000000238f9047
Dec 03 03:41:12 host-2 kernel: isert: isert_recv_done: DMA:
0x10a645a000, iSCSI opcode: 0x01, ITT: 0x00000024, flags: 0xa1 dlen:
512
Dec 03 03:41:12 host-2 kernel: isert: isert_recv_done: ISER ISCSI_CTRL PDU
Dec 03 03:41:12 host-2 kernel: isert: isert_handle_scsi_cmd: Transfer
Immediate imm_data_len: 512
Dec 03 03:41:12 host-2 kernel: isert: __isert_create_send_desc:
tx_desc 000000004b902cb9 lkey mismatch, fixing
Dec 03 03:41:12 host-2 kernel: isert: isert_init_tx_hdrs: Setup
tx_sg[0].addr: 0x4ce55b70 length: 76 lkey: 0x80480
Dec 03 03:41:12 host-2 kernel: isert: isert_put_response: Posting SCSI Response
Dec 03 03:41:12 host-2 kernel: isert: isert_send_done: Cmd 0000000069929548
Dec 03 03:41:12 host-2 kernel: isert: isert_unmap_tx_desc: unmap
single for tx_desc->dma_addr
Dec 03 03:41:12 host-2 kernel: isert: isert_put_cmd: Cmd 0000000069929548
Dec 03 03:41:12 host-2 kernel: isert: isert_recv_done: DMA:
0x10a645d000, iSCSI opcode: 0x01, ITT: 0x00000025, flags: 0x81 dlen: 0
Dec 03 03:41:12 host-2 kernel: isert: isert_recv_done: ISER ISCSI_CTRL PDU
Dec 03 03:41:12 host-2 kernel: isert: __isert_create_send_desc:
tx_desc 000000006d694fe9 lkey mismatch, fixing
Dec 03 03:41:12 host-2 kernel: isert: isert_init_tx_hdrs: Setup
tx_sg[0].addr: 0x4ce56140 length: 76 lkey: 0x80480
Dec 03 03:41:12 host-2 kernel: isert: isert_put_response: Posting SCSI Response
Dec 03 03:41:12 host-2 kernel: isert: isert_send_done: Cmd 00000000a666ae3c
Dec 03 03:41:12 host-2 kernel: isert: isert_unmap_tx_desc: unmap
single for tx_desc->dma_addr
Dec 03 03:41:12 host-2 kernel: isert: isert_put_cmd: Cmd 00000000a666ae3c
Dec 03 03:41:12 host-2 kernel: isert: isert_recv_done: DMA:
0x10a6460000, iSCSI opcode: 0x01, ITT: 0x00000026, flags: 0x81 dlen: 0
Dec 03 03:41:12 host-2 kernel: isert: isert_recv_done: ISER ISCSI_CTRL PDU
Dec 03 03:41:12 host-2 kernel: isert: __isert_create_send_desc:
tx_desc 00000000dd22ea75 lkey mismatch, fixing
Dec 03 03:41:12 host-2 kernel: isert: isert_init_tx_hdrs: Setup
tx_sg[0].addr: 0x4ce5e6f0 length: 76 lkey: 0x80480
Dec 03 03:41:12 host-2 kernel: isert: isert_put_response: Posting SCSI Response
Dec 03 03:41:12 host-2 kernel: isert: isert_send_done: Cmd 000000009b63dcb0
Dec 03 03:41:12 host-2 kernel: isert: isert_unmap_tx_desc: unmap
single for tx_desc->dma_addr
Dec 03 03:41:12 host-2 kernel: isert: isert_put_cmd: Cmd 000000009b63dcb0
Dec 03 03:41:12 host-2 kernel: isert: isert_recv_done: DMA:
0x10a6463000, iSCSI opcode: 0x01, ITT: 0x00000027, flags: 0xc1 dlen: 0
Dec 03 03:41:12 host-2 kernel: isert: isert_recv_done: ISER_RSV:
read_stag: 0x4000009a read_va: 0xac29e6800
Dec 03 03:41:12 host-2 kernel: isert: isert_recv_done: ISER ISCSI_CTRL PDU
Dec 03 03:41:12 host-2 kernel: isert: isert_put_datain: Cmd:
00000000fe3d39bf RDMA_WRITE data_length: 32
Dec 03 03:41:12 host-2 kernel: isert: __isert_create_send_desc:
tx_desc 00000000f5f10cf7 lkey mismatch, fixing
Dec 03 03:41:12 host-2 kernel: isert: isert_init_tx_hdrs: Setup
tx_sg[0].addr: 0x4ce56710 length: 76 lkey: 0x80480
Dec 03 03:41:12 host-2 kernel: isert: isert_put_datain: Cmd:
00000000fe3d39bf posted RDMA_WRITE for iSER Data READ rc: 0
Dec 03 03:41:12 host-2 kernel: isert: isert_send_done: Cmd 00000000fe3d39bf
Dec 03 03:41:12 host-2 kernel: isert: isert_unmap_tx_desc: unmap
single for tx_desc->dma_addr
Dec 03 03:41:12 host-2 kernel: isert: isert_put_cmd: Cmd 00000000fe3d39bf

[snip]

I could post the whole isert debug log somewhere if you'd like?

Thanks,
Steve

On Mon, Dec 2, 2019 at 10:26 PM Stephen Rust <srust@xxxxxxxxxxxxxxx> wrote:
>
> > oops, it should have been (arg4 & 511) != 0.
>
> Yep, there they are:
>
> # /usr/share/bcc/tools/trace -K 'bio_add_page ((arg4 & 511) != 0) "%d
> %d", arg3, arg4'
> PID     TID     COMM            FUNC             -
> 7411    7411    kworker/31:1H   bio_add_page     512 76
>         bio_add_page+0x1 [kernel]
>         sbc_execute_rw+0x28 [kernel]
>         __target_execute_cmd+0x2e [kernel]
>         target_execute_cmd+0x1c1 [kernel]
>         iscsit_execute_cmd+0x1e7 [kernel]
>         iscsit_sequence_cmd+0xdc [kernel]
>         isert_recv_done+0x780 [kernel]
>         __ib_process_cq+0x78 [kernel]
>         ib_cq_poll_work+0x29 [kernel]
>         process_one_work+0x179 [kernel]
>         worker_thread+0x4f [kernel]
>         kthread+0x105 [kernel]
>         ret_from_fork+0x1f [kernel]
>
> 7753    7753    kworker/26:1H   bio_add_page     4096 76
>         bio_add_page+0x1 [kernel]
>         sbc_execute_rw+0x28 [kernel]
>         __target_execute_cmd+0x2e [kernel]
>         target_execute_cmd+0x1c1 [kernel]
>         iscsit_execute_cmd+0x1e7 [kernel]
>         iscsit_sequence_cmd+0xdc [kernel]
>         isert_recv_done+0x780 [kernel]
>         __ib_process_cq+0x78 [kernel]
>         ib_cq_poll_work+0x29 [kernel]
>         process_one_work+0x179 [kernel]
>         worker_thread+0x4f [kernel]
>         kthread+0x105 [kernel]
>         ret_from_fork+0x1f [kernel]



[Index of Archives]     [Linux RAID]     [Linux SCSI]     [Linux ATA RAID]     [IDE]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Device Mapper]

  Powered by Linux