<!DOCTYPE html><html><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body> <div class="moz-cite-prefix">On 7/16/2025 12:57 PM, Gang Ba wrote: </div> <blockquote type="cite" cite="mid:20250716175753.703955-1-Gang.Ba@amd.com"> <pre wrap="" class="moz-quote-pre">If vm belongs to another process, this is fclose after fork, wait may enable signaling KFD eviction fence and cause parent process queue evicted.</pre> </blockquote> The commit message does not target the issue description. amdgpu_flush got trigger from child process when it makes execve system call because render node has O_CLOEXEC flag. fork only does not close inherited file descriptors from child process. The back trace below also shows that. Regards Xiaogang <blockquote type="cite" cite="mid:20250716175753.703955-1-Gang.Ba@amd.com"> <pre wrap="" class="moz-quote-pre"> [677852.634569] amdkfd_fence_enable_signaling+0x56/0x70 [amdgpu] [677852.634814] __dma_fence_enable_signaling+0x3e/0xe0 [677852.634820] dma_fence_wait_timeout+0x3a/0x140 [677852.634825] amddma_resv_wait_timeout+0x7f/0xf0 [amdkcl] [677852.634831] amdgpu_vm_wait_idle+0x2d/0x60 [amdgpu] [677852.635026] amdgpu_flush+0x34/0x50 [amdgpu] [677852.635208] filp_flush+0x38/0x90 [677852.635213] filp_close+0x14/0x30 [677852.635216] do_close_on_exec+0xdd/0x130 [677852.635221] begin_new_exec+0x1da/0x490 [677852.635225] load_elf_binary+0x307/0xea0 [677852.635231] ? srso_alias_return_thunk+0x5/0xfbef5 [677852.635235] ? ima_bprm_check+0xa2/0xd0 [677852.635240] search_binary_handler+0xda/0x260 [677852.635245] exec_binprm+0x58/0x1a0 [677852.635249] bprm_execve.part.0+0x16f/0x210 [677852.635254] bprm_execve+0x45/0x80 [677852.635257] do_execveat_common.isra.0+0x190/0x200 Suggested-by: Christian König <a class="moz-txt-link-rfc2396E" href="mailto:christian.koenig@amd.com"><christian.koenig@amd.com></a> Signed-off-by: Gang Ba <a class="moz-txt-link-rfc2396E" href="mailto:Gang.Ba@amd.com"><Gang.Ba@amd.com></a> --- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index ea9b0f050f79..2f75f967f95f 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -2414,13 +2414,13 @@ void amdgpu_vm_adjust_size(struct amdgpu_device *adev, uint32_t min_vm_size, */ long amdgpu_vm_wait_idle(struct amdgpu_vm *vm, long timeout) { - timeout = dma_resv_wait_timeout(vm->root.bo->tbo.base.resv, - DMA_RESV_USAGE_BOOKKEEP, - true, timeout); + guard(mutex)(&vm->eviction_lock); + + timeout = drm_sched_entity_flush(&vm->immediate, timeout); if (timeout <= 0) return timeout; - return dma_fence_wait_timeout(vm->last_unlocked, true, timeout); + return drm_sched_entity_flush(&vm->delayed, timeout); } static void amdgpu_vm_destroy_task_info(struct kref *kref) </pre> </blockquote> </body> </html>