Hello,
With 5.15.0-rc3 on my ppc64 (PowerMac G5) I am seeing kmemleak reports. They are always 96 bytes and with the same stacktrace.
unreferenced object 0xc000000011d2a7e0 (size 96): comm "X", pid 1743, jiffies 4295010075 (age 5457.040s) hex dump (first 32 bytes): c0 00 00 00 0b 9f f0 00 c0 00 3d 00 00 b0 85 90 ..........=..... 00 00 00 a9 77 41 30 23 c0 00 00 00 08 db b7 c8 ....wA0#........ backtrace: [<000000006f102108>] .nouveau_fence_new+0x4c/0x120 [nouveau] [<00000000395e0a83>] .nouveau_bo_move+0x4f0/0x870 [nouveau] [<00000000f17bc6da>] .ttm_bo_handle_move_mem+0xb4/0x1e0 [ttm] [<00000000fb36762f>] .ttm_bo_validate+0x144/0x230 [ttm] [<00000000a84dc7b3>] .nouveau_bo_validate+0x70/0xc0 [nouveau] [<00000000b4e870a2>] .nouveau_gem_ioctl_pushbuf+0x6e0/0x1a90 [nouveau] [<000000007b7c5c38>] .drm_ioctl_kernel+0x104/0x180 [drm] [<000000000af76e30>] .drm_ioctl+0x244/0x490 [drm] [<00000000ebb759e8>] .nouveau_drm_ioctl+0x78/0x140 [nouveau] [<00000000263274a7>] .__se_sys_ioctl+0xfc/0x160 [<0000000088c39f3d>] .system_call_exception+0x178/0x2a0 [<000000000cfdf34f>] system_call_common+0xec/0x250
If I decode this stacktrace using decode_stacktrace.sh so that the line numbers can be seen, I get the following:
.nouveau_fence_new+0x4c/0x120 [nouveau] linux-5.15-rc3/include/linux/slab.h:591 linux-5.15-rc3/include/linux/slab.h:721 linux-5.15-rc3/drivers/gpu/drm/nouveau/nouveau_fence.c:424
.nouveau_bo_move+0x4f0/0x870 [nouveau] linux-5.15-rc3/drivers/gpu/drm/nouveau/nouveau_bo.c:821 linux-5.15-rc3/drivers/gpu/drm/nouveau/nouveau_bo.c:1032
.ttm_bo_handle_move_mem+0xb4/0x1e0 [ttm] linux-5.15-rc3/drivers/gpu/drm/ttm/ttm_bo.c:197
.ttm_bo_validate+0x144/0x230 [ttm] linux-5.15-rc3/drivers/gpu/drm/ttm/ttm_bo.c:904 linux-5.15-rc3/drivers/gpu/drm/ttm/ttm_bo.c:981
.nouveau_bo_validate+0x70/0xc0 [nouveau] linux-5.15-rc3/drivers/gpu/drm/nouveau/nouveau_bo.c:647
.nouveau_gem_ioctl_pushbuf+0x6e0/0x1a90 [nouveau] linux-5.15-rc3/drivers/gpu/drm/nouveau/nouveau_gem.c:548 linux-5.15-rc3/drivers/gpu/drm/nouveau/nouveau_gem.c:605 linux-5.15-rc3/drivers/gpu/drm/nouveau/nouveau_gem.c:799
.drm_ioctl_kernel+0x104/0x180 [drm] linux-5.15-rc3/drivers/gpu/drm/drm_ioctl.c:795
.drm_ioctl+0x244/0x490 [drm] linux-5.15-rc3/include/linux/thread_info.h:185 linux-5.15-rc3/include/linux/thread_info.h:218 linux-5.15-rc3/include/linux/uaccess.h:199 linux-5.15-rc3/drivers/gpu/drm/drm_ioctl.c:899
.nouveau_drm_ioctl+0x78/0x140 [nouveau] linux-5.15-rc3/drivers/gpu/drm/nouveau/nouveau_drm.c:1163
.__se_sys_ioctl+0xfc/0x160 linux-5.15-rc3/fs/ioctl.c:51 linux-5.15-rc3/fs/ioctl.c:874 linux-5.15-rc3/fs/ioctl.c:860
.system_call_exception+0x178/0x2a0 .system_call_exception linux-5.15-rc3/arch/powerpc/kernel/interrupt.c:233
system_call_common+0xec/0x250 linux-5.15-rc3/arch/powerpc/kernel/interrupt_64.S:314
Here are all enabled DRM and NOUVEAU configs in my kernel:
CONFIG_DRM=m CONFIG_DRM_KMS_HELPER=m CONFIG_DRM_FBDEV_EMULATION=y CONFIG_DRM_FBDEV_OVERALLOC=100 CONFIG_DRM_TTM=m CONFIG_DRM_TTM_HELPER=m CONFIG_DRM_NOUVEAU=m CONFIG_NOUVEAU_DEBUG=5 CONFIG_NOUVEAU_DEBUG_DEFAULT=3 CONFIG_DRM_NOUVEAU_BACKLIGHT=y CONFIG_DRM_PANEL=y CONFIG_DRM_BRIDGE=y CONFIG_DRM_PANEL_BRIDGE=y CONFIG_DRM_PANEL_ORIENTATION_QUIRKS=m
And lspci output:
0000:f0:10.0 VGA compatible controller: NVIDIA Corporation NV34 [GeForce FX 5200 Ultra] (rev a1)
I have been running 5.12 on my machine without these reports. So it might be something that showed up in 5.13 or 5.14 as well.
I do not know if this is a good channel for reporting this, so please let me know if I should report it somewhere else. Also let me know if you need any additional information from me.
John Ogness