XPost: linux.debian.bugs.dist   
   From: pdmorrow@gmail.com   
      
   Package: src:linux   
   Version: 6.12.57-1   
   Severity: important   
   X-Debbugs-Cc: pdmorrow@gmail.com   
      
   Dear Maintainer,   
      
   I'm seeing a kernel crash quite soon after boot on a debian trixie based   
   system running 6.12.57+deb13-amd64, unfortunately the kernel panics before   
   I can access the system to gather more information. Thus I'll provide details   
   of the system using a previously known good version. The panic is happening   
   100% of the time unfortunately. I have access to the serial console however   
   so can enable any required verbose logging during boot if necessary.   
      
   Crucially the crash is not seen with kernel version 6.12.41+deb13-amd64 with   
   the   
   same userspace. We had pinned to that version until very recently to in order   
   to work around https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1109676   
      
   I'm running a dpdk application here (VPP) on Azure, VM form factor is a   
   "Standard DS3 v2 (4 vcpus, 14 GiB memory)".   
      
   The only relevant upstream commit in this area (as far as I can see) is:   
      
   https://lore.kernel.org/linux-hyperv/1bb599ee-fe28-409d-b430-2fc   
   86268936@linux.microsoft.com/   
      
   The comment regarding avoiding races at start adds a bit more weight behind   
   this   
   hunch, though it's only a hunch as I am most definitely nowhere near an expert   
   in this area.   
      
   -- Package-specific info:   
      
   [   19.625535] BUG: kernel NULL pointer dereference, address: 00000000000000a0   
   [   19.628874] #PF: supervisor read access in kernel mode   
   [   19.630841] #PF: error_code(0x0000) - not-present page   
   [   19.632788] PGD 0 P4D 0    
   [   19.633905] Oops: Oops: 0000 [#1] PREEMPT SMP PTI   
   [   19.635586] CPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted    
   .12.57+deb13-amd64 #1  Debian 6.12.57-1   
   [   19.640216] Hardware name: Microsoft Corporation Virtual Machine/Virtual   
   Machine, BIOS Hyper-V UEFI Release v4.1 09/28/2024   
   [   19.644514] RIP: 0010:hv_uio_channel_cb+0xd/0x20 [uio_hv_generic]   
   [   19.646994] Code: 02 00 00 5b 5d e9 53 98 69 e9 0f 1f 00 90 90 90 90 90 90   
   90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 48 8b 47 10 <48> 8b   
   b8 a0 00 00 00 f0 83 44 24 fc 00 e9 51 6f fa ff 90 90 90 90   
   [   19.654377] RSP: 0018:ffffb15ac01a4fa8 EFLAGS: 00010046   
   [   19.656385] RAX: 0000000000000000 RBX: 0000000000000015 RCX:    
   000000000000015   
   [   19.659240] RDX: 0000000000000001 RSI: ffffffffffffffff RDI:    
   fff8ff69c759400   
   [   19.662168] RBP: ffff8ff548790200 R08: ffff8ff548790200 R09:    
   0fca75150b080e9   
   [   19.665239] R10: 0000000000000000 R11: ffffb15ac01a4ff8 R12:    
   fff8ff871dc1480   
   [   19.668193] R13: ffff8ff69c759400 R14: ffff8ff69c7596a0 R15:    
   fffffffc106e160   
   [   19.671106] FS:  0000000000000000(0000) GS:ffff8ff871d80000(0000)   
   knlGS:0000000000000000   
   [   19.674281] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033   
   [   19.676533] CR2: 00000000000000a0 CR3: 0000000100ba6003 CR4:    
   0000000003706f0   
   [   19.679385] Call Trace:   
   [   19.680361]     
   [   19.681181]  vmbus_isr+0x1a5/0x210 [hv_vmbus]   
   [   19.682916]  __sysvec_hyperv_callback+0x32/0x60   
   [   19.684991]  sysvec_hyperv_callback+0x6c/0x90   
   [   19.686665]     
   [   19.687509]     
   [   19.688366]  asm_sysvec_hyperv_callback+0x1a/0x20   
   [   19.690262] RIP: 0010:pv_native_safe_halt+0xf/0x20   
   [   19.692067] Code: 09 e9 c5 08 01 00 0f 1f 44 00 00 90 90 90 90 90 90 90 90   
   90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e5 3b 31 00 fb f4  cc   
   cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90   
   [   19.699119] RSP: 0018:ffffb15ac0103ed8 EFLAGS: 00000246   
   [   19.701412] RAX: 0000000000000003 RBX: ffff8ff5403b1fc0 RCX:    
   fff8ff54c64ce30   
   [   19.704328] RDX: 0000000000000000 RSI: 0000000000000003 RDI:    
   00000000001f894   
   [   19.706910] RBP: 0000000000000003 R08: 000000000bb760d9 R09:    
   0fca75150b080e9   
   [   19.709762] R10: 0000000000000003 R11: 0000000000000001 R12:    
   000000000000000   
   [   19.712510] R13: 0000000000000000 R14: 0000000000000000 R15:    
   000000000000000   
   [   19.715173]  default_idle+0x9/0x20   
   [   19.716846]  default_idle_call+0x29/0x100   
   [   19.718623]  do_idle+0x1fe/0x240   
   [   19.720045]  cpu_startup_entry+0x29/0x30   
   [   19.721595]  start_secondary+0x11e/0x140   
   [   19.723080]  common_startup_64+0x13e/0x141   
   [   19.725222]     
   [   19.726387] Modules linked in: isofs cdrom uio_hv_generic uio binfmt_misc   
   intel_rapl_msr intel_rapl_common intel_uncore_frequency_common i   
   st_if_mbox_msr isst_if_common rpcrdma skx_edac_common nfit sunrpc libnvdimm   
   crct10dif_pclmul ghash_clmulni_intel    
   sha512_ssse3 sha256_ssse3 rdma_ucm ib_iser sha1_ssse3 rdma_cm aesni_intel   
   iw_cm gf128mul crypto_simd libiscsi cryptd ib_umad ib_ipoib scsi   
   transport_iscsi ib_cm rapl sg hv_utils hv_balloon evdev pcspkr joydev   
   mpls_router ip_tunnel ramoops configfs pstore_   
   blk efi_pstore pstore_zone nfnetlink vsock_loopback vmw_vsock_vi   
   tio_transport_common hv_sock vmw_vsock_vmci_transport vsock vmw_vmci efivarfs   
   ip_tables x_tables autofs4 overlay squashfs dm_verity dm_bufio reed_solomon   
   dm_mod loop ext4 crc16 mbcache jbd2    
   crc32c_generic mlx5_ib ib_uverbs ib_core mlx5_core mlxfw pci_hyperv   
   pci_hyperv_intf hyperv_drm drm_shmem_helper sd_mod drm_kms_helper hv_storvsc   
   scsi_transport_fc drm scsi_mod hid_generic hid_hyperv hid serio_raw hv_netvsc   
   hyperv_keyboard scsi_common hv_   
   vmbus   
   [   19.726466]  crc32_pclmul crc32c_intel   
   [   19.765771] CR2: 00000000000000a0   
   [   19.767524] ---[ end trace 0000000000000000 ]---   
   [   19.800433] RIP: 0010:hv_uio_channel_cb+0xd/0x20 [uio_hv_generic]   
   [   19.803170] Code: 02 00 00 5b 5d e9 53 98 69 e9 0f 1f 00 90 90 90 90 90 90   
   90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 48 8b 47 10 <48> 8b   
   b8 a0 00 00 00 f0 83 44 24 fc 00 e9 51 6f fa ff 90 90 90 90   
   [   19.811041] RSP: 0018:ffffb15ac01a4fa8 EFLAGS: 00010046   
   [   19.813466] RAX: 0000000000000000 RBX: 0000000000000015 RCX:    
   000000000000015   
   [   19.816504] RDX: 0000000000000001 RSI: ffffffffffffffff RDI:    
   fff8ff69c759400   
   [   19.819484] RBP: ffff8ff548790200 R08: ffff8ff548790200 R09:    
   0fca75150b080e9   
   [   19.822625] R10: 0000000000000000 R11: ffffb15ac01a4ff8 R12:    
   fff8ff871dc1480   
   [   19.825569] R13: ffff8ff69c759400 R14: ffff8ff69c7596a0 R15:    
   fffffffc106e160   
      
   [continued in next message]   
      
   --- SoupGate-Win32 v1.05   
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