on Anolis OS with SIOV supported, - start a VM with DSA mdev passthrough in DWQ mode - send an invalid page request from Guest This will change the host DSA device into halt state [ 517.758690] Unexpected page request in Privilege Mode [ 517.758693] Unexpected page request in Privilege Mode [ 517.758697] Unexpected page request in Privilege Mode [ 517.758814] idxd 0000:6a:01.0: idxd halted, need FLR. Any other DSA ops will timeout after that. And reboot the guest trigger a host panic. [ 574.479486] BUG: kernel NULL pointer dereference, address: 00000000000003d0 [ 574.493099] #PF: supervisor read access in kernel mode [ 574.498926] #PF: error_code(0x0000) - not-present page [ 574.504784] PGD 0 [ 574.507154] Oops: 0000 [#1] SMP NOPTI [ 574.511358] CPU: 82 PID: 5179 Comm: qemu-system-x86 Not tainted 5.10.112-ioasid #1 [ 574.519921] Hardware name: Intel Corporation ArcherCity/ArcherCity, BIOS EGSDCRB1.SYS.0077.D01.2203211346 03/21/2022 [ 574.531809] RIP: 0010:vidxd_mmio_init+0xc4/0x1e0 [idxd_mdev] [ 574.538245] Code: 0f 84 27 01 00 00 83 c8 02 88 85 6e 22 00 00 8b 85 78 22 00 00 25 00 00 fc ff 83 c8 01 89 85 78 22 00 00 48 8b 86 a0 04 00 00 <8b> 80 d0 03 00 00 88 85 80 22 00 00 48 8b 82 98 03 00 00 8b 40 08 [ 574.559312] RSP: 0018:ff68b7d90f3ffde0 EFLAGS: 00010202 [ 574.565277] RAX: 0000000000000000 RBX: ff4ec05ebb7f0000 RCX: 0000000000000000 [ 574.573337] RDX: ff4ec05e1303e000 RSI: ff4ec05e1303f000 RDI: ff4ec05ebb7f4248 [ 574.581416] RBP: ff4ec05ebb7f0000 R08: 0000000000000000 R09: ff4ec05ebb7f2248 [ 574.589495] R10: ff4ec05e75241600 R11: 0000000000000001 R12: ff4ec05e1303e000 [ 574.597575] R13: ff4ec05edfcbfa28 R14: ff4ec06d8704c520 R15: ff4ec05e9cc80f90 [ 574.605658] FS: 0000000000000000(0000) GS:ff4ec07d2ea80000(0000) knlGS:0000000000000000 [ 574.614777] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 574.621290] CR2: 00000000000003d0 CR3: 00000015ac00c004 CR4: 0000000000773ee0 [ 574.629360] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 574.637418] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400 [ 574.645482] PKRU: 55555554 [ 574.648601] Call Trace: [ 574.651462] idxd_vdcm_init+0x11a/0x1a0 [idxd_mdev] [ 574.657028] idxd_vdcm_close+0x131/0x150 [idxd_mdev] [ 574.662686] vfio_device_fops_release+0x4a/0x80 [ 574.667877] __fput+0x8e/0x240 [ 574.671407] task_work_run+0x5f/0x90 [ 574.675521] do_exit+0x364/0xb70 [ 574.679246] do_group_exit+0x3d/0xa0 [ 574.683356] __x64_sys_exit_group+0x14/0x20 [ 574.688157] do_syscall_64+0x33/0x40 [ 574.692259] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 574.698033] RIP: 0033:0x7f1c5b3b1ed1 [ 574.702123] Code: Unable to access opcode bytes at RIP 0x7f1c5b3b1ea7. [ 574.709517] RSP: 002b:00007ffd43019ad8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 574.718078] RAX: ffffffffffffffda RBX: 00007f1c5b4de6d0 RCX: 00007f1c5b3b1ed1 [ 574.726147] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 574.734228] RBP: 0000000000000000 R08: fffffffffffffba8 R09: 0000000000000001 [ 574.742305] R10: 0000000000000010 R11: 0000000000000246 R12: 00007f1c5b4de6d0 [ 574.750385] R13: 0000000000000000 R14: 00007f1c5b4deba8 R15: 00007f1c5b4debc0