Try unsynchronized userptr if regular one fails.
https://github.com/FreeBSDDesktop/kms-drm/issues/197

Process 51117 stopped
* thread #1, name = 'clinfo', stop reason = signal SIGABRT
    frame #0: 0x000000080044fe7a libc.so.7`__sys_thr_kill at thr_kill.S:4
(lldb) bt
* thread #1, name = 'clinfo', stop reason = signal SIGABRT
  * frame #0: 0x000000080044fe7a libc.so.7`__sys_thr_kill at thr_kill.S:4
    frame #1: 0x000000080044f7e4 libc.so.7`__raise(s=6) at raise.c:52:10
    frame #2: 0x00000008003b3a89 libc.so.7`abort at abort.c:67:8
    frame #3: 0x000000080043a711 libc.so.7`__assert(func=<unavailable>, file=<unavailable>, line=<unavailable>, failedexpr=<unavailable>) at assert.c:51:2
    frame #4: 0x0000000800e255ad libigdrcl.so`NEO::debugBreak(line=58, file="compute-runtime-19.48.14977/runtime/os_interface/linux/drm_memory_manager.cpp") at debug_helpers.cpp:19:9
    frame #5: 0x000000080104b4e5 libigdrcl.so`NEO::DrmMemoryManager::DrmMemoryManager(this=0x00000008018e7300, mode=gemCloseWorkerActive, forcePinAllowed=true, validateHostPtrMemory=true, executionEnvironment=0x00000008018f6180) at drm_memory_manager.cpp:58:9
    frame #6: 0x0000000800f07bb1 libigdrcl.so`std::__1::__unique_if<NEO::DrmMemoryManager>::__unique_single std::__1::make_unique<NEO::DrmMemoryManager, NEO::gemCloseWorkerMode, bool, bool, NEO::ExecutionEnvironment&>(__args=0x00007fffffffda4c, __args=0x00007fffffffda4b, __args=0x00007fffffffda4a, __args=0x00000008018f6180) at memory:3003:32
    frame #7: 0x0000000800f07ad4 libigdrcl.so`NEO::MemoryManager::createMemoryManager(executionEnvironment=0x00000008018f6180) at create_drm_memory_manager.cpp:16:12
    frame #8: 0x0000000800fbce8b libigdrcl.so`NEO::ExecutionEnvironment::initializeMemoryManager(this=0x00000008018f6180) at execution_environment.cpp:63:25
    frame #9: 0x0000000801058c9d libigdrcl.so`NEO::Platform::initialize(this=0x00000008025ea0a0) at platform.cpp:144:27
    frame #10: 0x0000000800e259f2 libigdrcl.so`::clGetPlatformIDs(numEntries=1, platforms=0x0000000800251500, numPlatforms=0x0000000000000000) at api.cpp:82:35
    frame #11: 0x0000000800e25c54 libigdrcl.so`::clIcdGetPlatformIDsKHR(numEntries=1, platforms=0x0000000800251500, numPlatforms=0x0000000000000000) at api.cpp:112:14
    frame #12: 0x000000080025d0e0 libOpenCL.so.1`__initClIcd + 3392
    frame #13: 0x00000008006a61a8 libthr.so.3`_thr_once(once_control=0x000000080026e038, init_routine=(libOpenCL.so.1`__initClIcd)) at thr_once.c:98:2
    frame #14: 0x000000080025b670 libOpenCL.so.1`clGetPlatformIDs_hid + 320
    frame #15: 0x000000000020f9cd clinfo`main(argc=<unavailable>, argv=0x00007fffffffe188) at clinfo.c:2656:10
    frame #16: 0x000000000020713d clinfo`_start(ap=<unavailable>, cleanup=<unavailable>) at crt1.c:76:7
(lldb) f 5
frame #5: 0x000000080104b4e5 libigdrcl.so`NEO::DrmMemoryManager::DrmMemoryManager(this=0x00000008018e7300, mode=gemCloseWorkerActive, forcePinAllowed=true, validateHostPtrMemory=true, executionEnvironment=0x00000008018f6180) at drm_memory_manager.cpp:58:9
   50
   51       if (forcePinEnabled || validateHostPtrMemory) {
   52           pinBB = allocUserptr(reinterpret_cast<uintptr_t>(memoryForPinBB), MemoryConstants::pageSize, 0, 0);
   53       }
   54
   55       if (!pinBB) {
   56           alignedFreeWrapper(memoryForPinBB);
   57           memoryForPinBB = nullptr;
-> 58           DEBUG_BREAK_IF(true);
   59           UNRECOVERABLE_IF(validateHostPtrMemory);
   60       }
   61   }

--- shared/source/os_interface/linux/drm_memory_manager.cpp.orig	2022-06-01 18:10:32 UTC
+++ shared/source/os_interface/linux/drm_memory_manager.cpp
@@ -248,7 +248,17 @@ NEO::BufferObject *DrmMemoryManager::allocUserptr(uint
     auto &drm = this->getDrm(rootDeviceIndex);
 
     if (drm.ioctl(DrmIoctl::GemUserptr, &userptr) != 0) {
-        return nullptr;
+        if (errno == ENODEV && userptr.flags == 0) {
+            userptr.flags = I915_USERPTR_UNSYNCHRONIZED;
+            if (drm.ioctl(DrmIoctl::GemUserptr, &userptr) != 0) {
+                if (geteuid() != 0) {
+                    printDebugString(true, stderr, "%s", "ioctl(I915_GEM_USERPTR) failed. Try running as root but expect poor stability.\n");
+                }
+                return nullptr;
+            }
+        } else {
+            return nullptr;
+        }
     }
 
     PRINT_DEBUG_STRING(DebugManager.flags.PrintBOCreateDestroyResult.get(), stdout, "Created new BO with GEM_USERPTR, handle: BO-%d\n", userptr.handle);