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CY8PR10MB7243.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Jan 2025 03:50:32.0662 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: W5FaT4oZCRxhTj4lq95qwaUvbtPPA7rCKqeZ+uB1bwHmw5jRZvCt8hd82PxkKwQHCCT2EuK1vkE9qw3VL7B0jC8hfJ7q4kYYV8E7KZh63PA= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR10MB5177 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=2025-01-02_03,2025-01-02_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 adultscore=0 spamscore=0 mlxlogscore=999 bulkscore=0 phishscore=0 malwarescore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2411120000 definitions=main-2501040028 X-Proofpoint-ORIG-GUID: NkBp4vHljT_kQRJOpYniFwLezI4yx4df X-Proofpoint-GUID: NkBp4vHljT_kQRJOpYniFwLezI4yx4df On 1/2/25 9:30 PM, bugzilla-daemon@kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=219652 > > --- Comment #10 from Alan Stern (stern@rowland.harvard.edu) --- > Re comment #8: I would like to know the answers to the questions asked in > comment #4 about the bad kernel: > > In sd_read_capacity(), does sd_try_rc16_first() return true? > > And why doesn't the "Very big device. Trying to use READ CAPACITY(16)" line,> along with the subsequent call to read_capacity_16(), get executed in the bad > kernel? I see it. With the new code we think the command is failing. We then retry the command 3 times like you described you saw in the trace. Then because on the 3rd retry we get 0xfffffffe instead of 0xffffffff, we don't hit the check below like I mentioned before: sector_size = read_capacity_10(sdkp, sdp, buffer); if (sector_size == -EOVERFLOW) goto got_data; if (sector_size < 0) return; if ((sizeof(sdkp->capacity) > 4) && (sdkp->capacity > 0xffffffffULL)) { int old_sector_size = sector_size; sd_printk(KERN_NOTICE, sdkp, "Very big device. " "Trying to use READ CAPACITY(16).\n"); sector_size = read_capacity_16(sdkp, sdp, lim, buffer); With the old kernel, we saw the first try succeed. We then saw the 0xffffffff and then tried read_capacity_16 above. And the reason for the difference was that with the new code, I forgot to add a check for if there was even an error. We ended up always retrying 3 times and that lead us to get the 0xfffffffe value on that last retry. so we need: diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index adee6f60c966..2dcf225c7017 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -210,6 +210,9 @@ static int scsi_check_passthrough(struct scsi_cmnd *scmd, struct scsi_sense_hdr sshdr; enum sam_status status; + if (!scmd->result) + return 0; + if (!failures) return 0;