In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
drm\/amdgpu: force complete the MES ring fences on reset<\/p>\n
The MES scheduler ring has no drm scheduler (no_scheduler = true), so it is
\nskipped by the force-completion loop in amdgpu_device_pre_asic_reset(). It uses
\na polling fence whose hw value lives in wb (GTT) memory and survives a MODE1
\nreset, while fence_drv.sync_seq keeps advancing for every packet.<\/p>\n
When the reset is triggered because MES itself stopped responding, the
\ntimed-out packets advance sync_seq past the last hw fence value MES wrote.
\nAfter resume the first MES submission polls forever on a seq that is never
\nwritten back, failing the resume and wedging the box on a second reset:<\/p>\n
amdgpu: MES ring buffer is full.
\n amdgpu: *ERROR* ring gfx_0.0.0 test failed (-110)
\n amdgpu: resume of IP block failed -110
\n amdgpu: GPU reset end with ret = -110<\/p>\n
Force complete the MES scheduler ring fences together with the scheduler rings
\nso their hw fence is realigned to sync_seq.<\/p>\n
v2: cover all XCCs (one scheduler ring each), not just mes.ring[0].<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
drm\/amdgpu: force complete the MES ring fences on reset<\/p>\n
The MES scheduler ring has no drm scheduler (no_scheduler = true), so it i<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24499","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24499","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=24499"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24499"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}