[Bug 81861] Oops by mvsas v0.8.16: sas: ataX: end_device-Y:0:Z: dev error handler -> general protection fault, RIP: mvs_task_prep_ata+0x80/0x3a0

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https://bugzilla.kernel.org/show_bug.cgi?id=81861

--- Comment #9 from linux-ide@xxxxxxxxxxxxx ---
re: Thats not a sensible resolution, it can't be faulting on that line.

Another try using a newer version of package gdb-minimal (Ubuntu 7.7-0ubuntu3.2
from trusty-proposed) gives these identical results where address <+1838> maps
to line 471 in mvsas.c and that points to "(MVS_PHY_ID << TXQ_PHY_SHIFT) |".

# cat /sys/module/mvsas/sections/.init.text
0xffffffffa01c2000

(gdb) add-symbol-file
/usr/lib/debug/lib/modules/3.13.0-24-generic/kernel/drivers/scsi/mvsas/mvsas.ko
0xffffffffa01c2000
add symbol table from file
"/usr/lib/debug/lib/modules/3.13.0-24-generic/kernel/drivers/scsi/mvsas/mvsas.ko"
at
    .text_addr = 0xffffffffa01c2000

   0xffffffffa01c481e <+1838>:    mov    0x254(%rbx),%ecx

(gdb) list *0xffffffffa01c481e
0xffffffffa01c481e is in mvs_task_prep
(/build/buildd/linux-3.13.0/drivers/scsi/mvsas/mv_sas.c:471).
466        }
467        slot = &mvi->slot_info[tag];
468        slot->tx = mvi->tx_prod;
469        del_q = TXQ_MODE_I | tag |
470            (TXQ_CMD_STP << TXQ_CMD_SHIFT) |
471            (MVS_PHY_ID << TXQ_PHY_SHIFT) |
472            (mvi_dev->taskfileset << TXQ_SRS_SHIFT);
473        mvi->tx[mvi->tx_prod] = cpu_to_le32(del_q);
474
475        if (task->data_dir == DMA_FROM_DEVICE)

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