drm/xe: Fix app hang on pagefault - GDB signal not received - #411
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drm/xe: Fix app hang on pagefault - GDB signal not received#411pravalikagurram1 wants to merge 1 commit into
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Application hangs and GDB never receives pagefault signal. VM_BIND ioctl blocks indefinitely, UMD cannot resume application or signal debugger. Root cause : decompression was skipped even with DECOMPRESS flag set. GPU received stale buffer, triggered engine reset, hung the kernel. This is due to drm UAPI DRM_XE_VM_BIND_FLAG_DECOMPRESS mismatch Move DECOMPRESS flag from bit 6 to bit 7 in UAPI (UMD mismatch) with this VM_BIND completes, decompression succeeds, UMD resumes app, GDB can attach debugger. No more app hang. Fixes: 45ada40 ("drm/xe: Add VM_BIND DECOMPRESS support") Signed-off-by: Pravalika Gurram <pravalika.gurram@intel.com>
CI Bug Log - changes from xkb-6.17-278-c586e863fdd23077866d3dbc0a624f7c23e7efb4_BAT -> xkb-pr-6.17-411-648-17e0562e042ea3856013e426d4d3738ab5f55426_BATSummarySUCCESS No regressions found. Participating hosts (9 -> 9)No changes in participating hosts Known issuesHere are the changes found in xkb-pr-6.17-411-648-17e0562e042ea3856013e426d4d3738ab5f55426_BAT that come from known issues: IGT changesIssues hit
Possible fixes
Build changes
igt-xkb-128-3a036e31e: 3a036e31e |
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Application hangs and GDB never receives pagefault signal.
VM_BIND ioctl blocks indefinitely, UMD cannot resume
application or signal debugger.
Root cause : decompression was skipped even
with DECOMPRESS flag set. GPU received stale buffer, triggered engine
reset, hung the kernel.
This is due to drm UAPI DRM_XE_VM_BIND_FLAG_DECOMPRESS mismatch
Move DECOMPRESS flag from bit 6 to bit 7 in UAPI (UMD mismatch)
with this VM_BIND completes, decompression succeeds, UMD resumes app, GDB
can attach debugger. No more app hang.
Fixes: 45ada40 ("drm/xe: Add VM_BIND DECOMPRESS support")
Signed-off-by: Pravalika Gurram pravalika.gurram@intel.com