Noyau 5.4, le réseau est ok :
[    2.992331] bnx2: QLogic bnx2 Gigabit Ethernet Driver v2.2.6 (January 29, 2014)
[    3.040639] bnx2 0000:01:00.0 eth0: Broadcom NetXtreme II BCM5716 1000Base-T (C0) PCI Express found at mem c0000000, IRQ 16, node addr d4:ae:52:ce:c5:c7
[    3.107974] bnx2 0000:01:00.1 eth1: Broadcom NetXtreme II BCM5716 1000Base-T (C0) PCI Express found at mem c2000000, IRQ 17, node addr d4:ae:52:ce:c5:c8
[    3.259068] bnx2 0000:01:00.1 em2: renamed from eth1
[    3.352484] bnx2 0000:01:00.0 em1: renamed from eth0
[    7.277952] bnx2 0000:01:00.0 em1: using MSIX
[    8.329572] bnx2 0000:01:00.1 em2: using MSIX
[   10.341387] bnx2 0000:01:00.0 em1: NIC Copper Link is Up, 1000 Mbps full duplex
[   12.988454] bnx2 0000:01:00.1 em2: NIC Copper Link is Up, 1000 Mbps full duplex

Noyau 5.11, le réseau ne fonctionne pas car em1 et em2 sont introuvable :
[    2.947141] bnx2 0000:01:00.0 eth0: Broadcom NetXtreme II BCM5716 1000Base-T (C0) PCI Express found at mem c0000000, IRQ 16, node addr d4:ae:52:ce:c5:c7
[    2.978902] bnx2 0000:01:00.1 eth1: Broadcom NetXtreme II BCM5716 1000Base-T (C0) PCI Express found at mem c2000000, IRQ 17, node addr d4:ae:52:ce:c5:c8

Je me demande si ce n'est pas le bug https://bugzilla.proxmox.com/show_bug.cgi?id=3558

C'est également un serveur Dell

Si tu n'utilises pas de carte réseau qui utilise le module bnx2, tu ne devrais pas être impacté.

Voici les cartes réseau du serveur LaFibre.info :

01:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme II BCM5716 Gigabit Ethernet (rev 20)
DeviceName: Embedded NIC 1
Subsystem: Dell NetXtreme II BCM5716 Gigabit Ethernet
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 16
Region 0: Memory at c0000000 (64-bit, non-prefetchable) [size=32M]
Capabilities: [48] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [50] Vital Product Data
Product Name: Broadcom NetXtreme II Ethernet Controller
Read-only fields:
[PN] Part number: BCM95716C1
[EC] Engineering changes: 220197-3
[SN] Serial number: 0123456789
[MN] Manufacture ID: 1028
[V0] Vendor specific: 08.07.25
[RV] Reserved: checksum good, 20 byte(s) reserved
End
Capabilities: [58] MSI: Enable- Count=1/16 Maskable- 64bit+
Address: 0000000000000000  Data: 0000
Capabilities: [a0] MSI-X: Enable+ Count=9 Masked-
Vector table: BAR=0 offset=0000c000
PBA: BAR=0 offset=0000e000
Capabilities: [ac] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 512 bytes, PhantFunc 0, Latency L0s <4us, L1 <64us
ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset- SlotPowerLimit 25.000W
DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq+
RlxdOrd+ ExtTag- PhantFunc- AuxPwr+ NoSnoop+
MaxPayload 128 bytes, MaxReadReq 512 bytes
DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq+ AuxPwr+ TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x4, ASPM L0s L1, Exit Latency L0s <2us, L1 <2us
ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s (ok), Width x4 (ok)
TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, NROPrPrP-, LTR-
10BitTagComp-, 10BitTagReq-, OBFF Not Supported, ExtFmt-, EETLPPrefix-
EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
FRS-, TPHComp-, ExtTPHComp-
AtomicOpsCap: 32bit- 64bit- 128bitCAS-
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
AtomicOpsCtl: ReqEn-
LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1-
EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
Capabilities: [100 v1] Device Serial Number d4-ae-52-ff-fe-ce-c5-c7
Capabilities: [110 v1] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP+ SDES- TLP+ FCP+ CmpltTO+ CmpltAbrt+ UnxCmplt+ RxOF+ MalfTLP+ ECRC+ UnsupReq+ ACSViol-
UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr+
CEMsk: RxErr- BadTLP+ BadDLLP+ Rollover+ Timeout+ AdvNonFatalErr+
AERCap: First Error Pointer: 00, ECRCGenCap+ ECRCGenEn- ECRCChkCap+ ECRCChkEn-
MultHdrRecCap- MultHdrRecEn- TLPPfxPres- HdrLogCap-
HeaderLog: 00000000 00000000 00000000 00000000
Capabilities: [150 v1] Power Budgeting <?>
Capabilities: [160 v1] Virtual Channel
Caps: LPEVC=0 RefClk=100ns PATEntryBits=1
Arb: Fixed- WRR32- WRR64- WRR128-
Ctrl: ArbSelect=Fixed
Status: InProgress-
VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
Status: NegoPending- InProgress-
Kernel driver in use: bnx2
Kernel modules: bnx2

01:00.1 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme II BCM5716 Gigabit Ethernet (rev 20)
DeviceName: Embedded NIC 2
Subsystem: Dell NetXtreme II BCM5716 Gigabit Ethernet
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin B routed to IRQ 17
Region 0: Memory at c2000000 (64-bit, non-prefetchable) [size=32M]
Capabilities: [48] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [50] Vital Product Data
Product Name: Broadcom NetXtreme II Ethernet Controller
Read-only fields:
[PN] Part number: BCM95716C1
[EC] Engineering changes: 220197-3
[SN] Serial number: 0123456789
[MN] Manufacture ID: 1028
[V0] Vendor specific: 08.07.25
[RV] Reserved: checksum good, 20 byte(s) reserved
End
Capabilities: [58] MSI: Enable- Count=1/16 Maskable- 64bit+
Address: 0000000000000000  Data: 0000
Capabilities: [a0] MSI-X: Enable+ Count=9 Masked-
Vector table: BAR=0 offset=0000c000
PBA: BAR=0 offset=0000e000
Capabilities: [ac] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 512 bytes, PhantFunc 0, Latency L0s <4us, L1 <64us
ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset- SlotPowerLimit 25.000W
DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq+
RlxdOrd+ ExtTag- PhantFunc- AuxPwr+ NoSnoop+
MaxPayload 128 bytes, MaxReadReq 512 bytes
DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq+ AuxPwr+ TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x4, ASPM L0s L1, Exit Latency L0s <2us, L1 <2us
ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s (ok), Width x4 (ok)
TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, NROPrPrP-, LTR-
10BitTagComp-, 10BitTagReq-, OBFF Not Supported, ExtFmt-, EETLPPrefix-
EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
FRS-, TPHComp-, ExtTPHComp-
AtomicOpsCap: 32bit- 64bit- 128bitCAS-
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
AtomicOpsCtl: ReqEn-
LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1-
EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
Capabilities: [100 v1] Device Serial Number d4-ae-52-ff-fe-ce-c5-c8
Capabilities: [110 v1] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP+ SDES- TLP+ FCP+ CmpltTO+ CmpltAbrt+ UnxCmplt+ RxOF+ MalfTLP+ ECRC+ UnsupReq+ ACSViol-
UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr+
CEMsk: RxErr- BadTLP+ BadDLLP+ Rollover+ Timeout+ AdvNonFatalErr+
AERCap: First Error Pointer: 00, ECRCGenCap+ ECRCGenEn- ECRCChkCap+ ECRCChkEn-
MultHdrRecCap- MultHdrRecEn- TLPPfxPres- HdrLogCap-
HeaderLog: 00000000 00000000 00000000 00000000
Capabilities: [150 v1] Power Budgeting <?>
Capabilities: [160 v1] Virtual Channel
Caps: LPEVC=0 RefClk=100ns PATEntryBits=1
Arb: Fixed- WRR32- WRR64- WRR128-
Ctrl: ArbSelect=Fixed
Status: InProgress-
VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
Status: NegoPending- InProgress-
Kernel driver in use: bnx2
Kernel modules: bnx2

Il est pas tout jeune ce serveur... il va feter ses 10ans (le CPU date du 2ém trimestre 2011)

$ lscpu
Architecture :                          x86_64
Mode(s) opératoire(s) des processeurs : 32-bit, 64-bit
Boutisme :                              Little Endian
Address sizes:                          39 bits physical, 48 bits virtual
Processeur(s) :                         8
Liste de processeur(s) en ligne :       0-7
Thread(s) par cœur :                    2
Cœur(s) par socket :                    4
Socket(s) :                             1
Nœud(s) NUMA :                          1
Identifiant constructeur :              GenuineIntel
Famille de processeur :                 6
Modèle :                                158
Nom de modèle :                         Intel(R) Xeon(R) CPU E3-1240 v6 @ 3.70GHz
Révision :                              9
Vitesse du processeur en MHz :          3700.000
Vitesse maximale du processeur en MHz : 4100,0000
Vitesse minimale du processeur en MHz : 800,0000
BogoMIPS :                              7399.70
Virtualisation :                        VT-x
Cache L1d :                             128 KiB
Cache L1i :                             128 KiB
Cache L2 :                              1 MiB
Cache L3 :                              8 MiB
Nœud NUMA 0 de processeur(s) :          0-7
Vulnerability Itlb multihit:            KVM: Mitigation: VMX disabled
Vulnerability L1tf:                     Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable
Vulnerability Mds:                      Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Meltdown:                 Mitigation; PTI
Vulnerability Spec store bypass:        Mitigation; Speculative Store Bypass disabled via prctl and seccomp
Vulnerability Spectre v1:               Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2:               Mitigation; Full generic retpoline, IBPB conditional, IBRS_FW, STIBP conditional, RSB filling
Vulnerability Srbds:                    Mitigation; Microcode
Vulnerability Tsx async abort:          Mitigation; Clear CPU buffers; SMT vulnerable
Drapaux :                               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 no
                                        nstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdc
                                        m pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowpref
                                        etch cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad f
                                        sgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx rdseed adx smap clflushopt intel_pt xsaveop
                                        t xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear flush_l1d
De mon coté je suis repassé sur le noyeau 5.4. Il faudra que je réalise des test avant de faire la mise à jour vers Ubuntu 22.04 LTS, mais ce ne sera pas tout de suite, SMF prend son temps pour prendre en charge les versions récente de PHP.

Le suppport de PHP 7.2 a été prposé à partir de janvier 2020.
Le suppport de PHP 7.4 a été prposé à partir de février 2021.

Je n'ai pas testé (c'était le plan B si le retour en noyau 5.4 ne fonctionnait pas)

Il manque quand même la ligne suivante qui n’apparaît pas avec le noyau 5.11 :
[    2.992331] bnx2: QLogic bnx2 Gigabit Ethernet Driver v2.2.6 (January 29, 2014)