#linux-exynos on 2020-08-29 — irc logs at freenode.irclog.whitequark.org

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10:20 <LiquidAcid> hey, i'm running into a kernel bug with lima on 5.8.y:

10:20 <LiquidAcid> kernel BUG at drivers/gpu/drm/drm_mm.c:1010!

10:21 <LiquidAcid> i tried to analyze things, but now i'm wondering how this could've ever worked

10:22 <LiquidAcid> the callstack is: lima_device_init() -> lima_vm_create() -> drm_mm_init()

10:23 <LiquidAcid> in drm_mm_init() there's DRM_MM_BUG_ON(start + size <= start), which is triggered

10:24 <LiquidAcid> i checked va_start and va_end in lima_vm_create() and both a zero, then obviously start and size in drm_mm_init() are also zero

10:24 <LiquidAcid> 0 + 0 <= 0, bang

10:25 <LiquidAcid> it puzzles me that both va_start and va_end are only ever initialized AFTER the inital call to lima_vm_create()

10:25 <LiquidAcid> but maybe there's some magic here i don't see

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