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Migration testing in i915 assumes current task's address space to allocate new userspace mapping and uses it without registering real user for that address space in mm_struct. On single NUMA node setups PCI probe executes in the same context as userspace process calling the test (i915_selftest from IGT), but when multiple nodes are available, the PCI code puts probe into a kernel workqueue. This switches execution to a kworker, which does not have its own address space in userspace and must borrow such memory from another process, so "current->active_mm" is unknown at the start of the test. It was observed that mm->mm_users would occasionally be 0 or drop to 0 during the test due to short delay between scheduling and executing work in forked process, which reaped userspace mappings, further leading to failures upon reading from userland memory. Prevent this by adding a PID parameter to a trusted task, so its mm_struct may be used if needed. Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14204 Signed-off-by: Krzysztof Karas <krzysztof.karas@intel.com> Reviewed-by: Michał Grzelak <michal.grzelak@intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Reviewed-by: Sebastian Brzezinka <sebastian.brzezinka@intel.com> Reviewed-by: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com> Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com> Link: https://lore.kernel.org/r/20260508080214.1979686-2-krzysztof.karas@intel.com |
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| .. | ||
| i915_active.c | ||
| i915_gem_evict.c | ||
| i915_gem_gtt.c | ||
| i915_gem.c | ||
| i915_live_selftests.h | ||
| i915_mock_selftests.h | ||
| i915_perf_selftests.h | ||
| i915_perf.c | ||
| i915_random.c | ||
| i915_random.h | ||
| i915_request.c | ||
| i915_selftest.c | ||
| i915_sw_fence.c | ||
| i915_syncmap.c | ||
| i915_vma.c | ||
| igt_atomic.c | ||
| igt_atomic.h | ||
| igt_flush_test.c | ||
| igt_flush_test.h | ||
| igt_live_test.c | ||
| igt_live_test.h | ||
| igt_mmap.c | ||
| igt_mmap.h | ||
| igt_reset.c | ||
| igt_reset.h | ||
| igt_spinner.c | ||
| igt_spinner.h | ||
| intel_memory_region.c | ||
| intel_scheduler_helpers.c | ||
| intel_scheduler_helpers.h | ||
| intel_uncore.c | ||
| lib_sw_fence.c | ||
| lib_sw_fence.h | ||
| librapl.c | ||
| librapl.h | ||
| mock_drm.h | ||
| mock_gem_device.c | ||
| mock_gem_device.h | ||
| mock_gtt.c | ||
| mock_gtt.h | ||
| mock_region.c | ||
| mock_region.h | ||
| mock_request.c | ||
| mock_request.h | ||
| mock_uncore.c | ||
| mock_uncore.h | ||
| scatterlist.c | ||