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X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: fbvI8minBtQx8nN39u+M48dFXl5Qjp2S/MfvaFo3Dp+JfNn5rrNqp/AQsuAWAKermlMTycWMp82vRbsUBh6xLUEwNCGH1i4Bm1R1NPqX2qg= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR10MB6126 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-01-31_04,2025-01-31_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 malwarescore=0 spamscore=0 phishscore=0 suspectscore=0 mlxscore=0 mlxlogscore=999 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2501170000 definitions=main-2501310092 X-Proofpoint-ORIG-GUID: fJRy3y3cRbMWy6Gud5vx7Cj_ipm5wUk_ X-Proofpoint-GUID: fJRy3y3cRbMWy6Gud5vx7Cj_ipm5wUk_ On 30/01/25 6:05 PM, Jürgen Groß wrote: > On 29.01.25 19:46, Harshvardhan Jha wrote: >> >> On 30/01/25 12:13 AM, Jürgen Groß wrote: >>> On 29.01.25 19:35, Harshvardhan Jha wrote: >>>> >>>> On 29/01/25 4:52 PM, Juergen Gross wrote: >>>>> On 29.01.25 10:15, Harshvardhan Jha wrote: >>>>>> >>>>>> On 29/01/25 2:34 PM, Greg KH wrote: >>>>>>> On Wed, Jan 29, 2025 at 02:29:48PM +0530, Harshvardhan Jha wrote: >>>>>>>> Hi Greg, >>>>>>>> >>>>>>>> On 29/01/25 2:18 PM, Greg KH wrote: >>>>>>>>> On Wed, Jan 29, 2025 at 02:13:34PM +0530, Harshvardhan Jha wrote: >>>>>>>>>> Hi there, >>>>>>>>>> >>>>>>>>>> On 29/01/25 2:05 PM, Greg KH wrote: >>>>>>>>>>> On Wed, Jan 29, 2025 at 02:03:51PM +0530, Harshvardhan Jha >>>>>>>>>>> wrote: >>>>>>>>>>>> Hi All, >>>>>>>>>>>> >>>>>>>>>>>> +stable >>>>>>>>>>>> >>>>>>>>>>>> There seems to be some formatting issues in my log output. I >>>>>>>>>>>> have >>>>>>>>>>>> attached it as a file. >>>>>>>>>>> Confused, what are you wanting us to do here in the stable >>>>>>>>>>> tree? >>>>>>>>>>> >>>>>>>>>>> thanks, >>>>>>>>>>> >>>>>>>>>>> greg k-h >>>>>>>>>> Since, this is reproducible on 5.4.y I have added stable. The >>>>>>>>>> culprit >>>>>>>>>> commit which upon getting reverted fixes this issue is also >>>>>>>>>> present in >>>>>>>>>> 5.4.y stable. >>>>>>>>> What culprit commit?  I see no information here :( >>>>>>>>> >>>>>>>>> Remember, top-posting is evil... >>>>>>>> My apologies, >>>>>>>> >>>>>>>> The stable tag v5.4.289 seems to fail to boot with the following >>>>>>>> prompt in an infinite loop: >>>>>>>> [   24.427217] megaraid_sas 0000:65:00.0: megasas_build_io_fusion >>>>>>>> 3273 sge_count (-12) is out of range. Range is:  0-256 >>>>>>>> >>>>>>>> Reverting the following patch seems to fix the issue: >>>>>>>> >>>>>>>> stable-5.4      : v5.4.285             - 5df29a445f3a >>>>>>>> xen/swiotlb: add >>>>>>>> alignment check for dma buffers >>>>>>>> >>>>>>>> I tried changing swiotlb grub command line arguments but that >>>>>>>> didn't >>>>>>>> seem to help much unfortunately and the error was seen again. >>>>>>>> >>>>>>> Ok, can you submit this revert with the information about why it >>>>>>> should >>>>>>> not be included in the 5.4.y tree and cc: everyone involved and >>>>>>> then we >>>>>>> will be glad to queue it up. >>>>>>> >>>>>>> thanks, >>>>>>> >>>>>>> greg k-h >>>>>> >>>>>> This might be reproducible on other stable trees and mainline as >>>>>> well so >>>>>> we will get it fixed there and I will submit the necessary fix to >>>>>> stable >>>>>> when everything is sorted out on mainline. >>>>> >>>>> Right. Just reverting my patch will trade one error with another one >>>>> (the >>>>> one which triggered me to write the patch). >>>>> >>>>> There are two possible ways to fix the issue: >>>>> >>>>> - allow larger DMA buffers in xen/swiotlb (today 2MB are the max. >>>>> supported >>>>>     size, the megaraid_sas driver seems to effectively request 4MB) >>>> >>>> This seems relatively simpler to implement but I'm not sure whether >>>> it's >>>> the most optimal approach >>> >>> Just making the static array larger used to hold the frame numbers for >>> the >>> buffer seems to be a waste of memory for most configurations. >> Yep definitely not required in most cases. >>> >>> I'm thinking of an allocated array using the max needed size (replace a >>> former buffer with a larger one if needed). >> >> This seems like the right way to go. > > Can you try the attached patch, please? I don't have a system at hand > showing the problem. I tried this and got this error in an infinite loop again: [   25.827922] megaraid_sas 0000:65:00.0: megasas_build_io_fusion 3273 sge_count (-12) is out of range. Range is:  0-256 [   25.828447] megaraid_sas 0000:65:00.0: Error building command > > > Juergen