[缺陷描述]： discovery log page疑似超过4K大小，无法获取日志信息 部分日志信息： Running nvme/002 Discovery Log Number of Records 1000, Generation counter X =====Discovery Log Entry 0====== trtype: loop subnqn: blktests-subsystem-0 =====Discovery Log Entry 1====== trtype: loop subnqn: blktests-subsystem-1 =====Discovery Log Entry 2====== trtype: loop subnqn: blktests-subsystem-2 =====Discovery Log Entry 3====== trtype: unrecognized------------------------------无法获取信息 subnqn:--------------------------------------------无法获取信息 =====Discovery Log Entry 4====== trtype: loop subnqn: blktests-subsystem-0 =====Discovery Log Entry 5====== trtype: loop subnqn: blktests-subsystem-1 =====Discovery Log Entry 6====== trtype: loop subnqn: blktests-subsystem-2 =====Discovery Log Entry 7====== trtype: unrecognized------------------------------无法获取信息 subnqn:--------------------------------------------无法获取信息 =====Discovery Log Entry 8====== trtype: loop subnqn: blktests-subsystem-0 =====Discovery Log Entry 9====== trtype: loop subnqn: blktests-subsystem-1 =====Discovery Log Entry 10====== trtype: loop subnqn: blktests-subsystem-0 [重现概率]： 必现 [重现环境]： 环境信息：物理机 OS： KERNEL: # uname -r 4.19.91-516.git.0883ecf752.an8.x86_64+debug MEMORY: # free -h total used free shared buff/cache available Mem: 438Gi 17Gi 419Gi 73Mi 1.8Gi 418Gi Swap: 2.0Gi 0B 2.0Gi CPU: # lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 96 On-line CPU(s) list: 1,3,5,9-11,13-18,20,21,23,24,27-29,33-36,39-44,48,54,56,58-60,62-66,68,69,73,75,76 Off-line CPU(s) list: 0,2,4,6-8,12,19,22,25,26,30-32,37,38,45-47,49-53,55,57,61,67,70-72,74,77-95 Thread(s) per core: 1 Core(s) per socket: 17 Socket(s): 2 NUMA node(s): 1 Vendor ID: GenuineIntel BIOS Vendor ID: Intel(R) Corporation CPU family: 6 Model: 85 Model name: Intel(R) Xeon(R) Platinum 8163 CPU @ 2.50GHz BIOS Model name: Intel(R) Xeon(R) Platinum 8163 CPU @ 2.50GHz Stepping: 4 CPU MHz: 2800.066 CPU max MHz: 3100.0000 CPU min MHz: 1000.0000 BogoMIPS: 5000.00 Virtualization: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 1024K L3 cache: 33792K NUMA node0 CPU(s): 1,3,5,9-11,13-18,20,21,23,24,27-29,33-36,39-44,48,54,56,58-60,62-66,68,69,73,75,76 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 invpcid_single pti intel_ppin ssbd mba ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm mpx rdt_a avx512f avx512dq rdseed adx smap clflushopt clwb intel_pt avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts pku ospke md_clear flush_l1d arch_capabilities # cat /etc/os-release NAME="Anolis OS" VERSION="8.6" ID="anolis" ID_LIKE="rhel fedora centos" VERSION_ID="8.6" PLATFORM_ID="platform:an8" PRETTY_NAME="Anolis OS 8.6" ANSI_COLOR="0;31" HOME_URL="https://openanolis.cn/" NVME版本： # rpm -qa | grep nvme nvme-cli-1.16-3.an8.x86_64 [复现步骤]： git clone https://github.com/osandov/blktests.git blktests cd blktests make make install prefix=./run_blktests cd ./run_blktests/blktests wipefs -a -f /dev/nvme0n1 mountpoint /export partprobe /dev/nvme0n1 parted -s /dev/nvme0n1 mklabel gpt mkpart primary 2048 3662830 Use TEST_DEVS=(/dev/nvme0n1p1) [2022-11-08 16:39:02] modprobe -n -q loop [2022-11-08 16:39:02] modprobe -n -q nvme-loop [2022-11-08 16:39:02] modprobe -n -q nvmet [2022-11-08 16:39:02] modprobe -n -q nvme-core ./check nvme/002 [期望结果]： 用例pass [实际结果]： 用例fail [原因分析]： 这个用例主要测试在同一个nvmet port下面建立大量 subsystem，然后执行 nvme discover -t loop 查看信息 port下面所有的subsystem配置一样，但是第4个、第8个（..第4的倍数个）subsystem日志信息就无法查看，这疑似是个问题 部分展示日志如下： Running nvme/002 Discovery Log Number of Records 1000, Generation counter X =====Discovery Log Entry 0====== trtype: loop subnqn: blktests-subsystem-0 =====Discovery Log Entry 1====== trtype: loop subnqn: blktests-subsystem-1 =====Discovery Log Entry 2====== trtype: loop subnqn: blktests-subsystem-2 =====Discovery Log Entry 3====== trtype: unrecognized subnqn: =====Discovery Log Entry 4====== trtype: loop subnqn: blktests-subsystem-0 =====Discovery Log Entry 5====== trtype: loop subnqn: blktests-subsystem-1 =====Discovery Log Entry 6====== trtype: loop subnqn: blktests-subsystem-2 =====Discovery Log Entry 7====== trtype: unrecognized subnqn: =====Discovery Log Entry 8====== trtype: loop subnqn: blktests-subsystem-0 =====Discovery Log Entry 9====== trtype: loop subnqn: blktests-subsystem-1 =====Discovery Log Entry 10====== trtype: loop subnqn: blktests-subsystem-0