Public bug reported:
[Impact]
After enable CONFIG_DEBUG_KMEMLEAK, Kmemleak detects potential leak.
root@mtk-genio:/home/gjiang# cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff0000dad64400 (size 512):
comm "kworker/u16:3", pid 146, jiffies 4294896229 (age 8550.412s)
hex dump (first 32 bytes):
00 40 19 03 00 fc ff ff 00 00 00 00 00 00 10 00 .@..............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000ce19c3ae>] __kmalloc+0x260/0x410
[<00000000a3612fef>] sg_alloc_append_table_from_pages+0x324/0x490
[<0000000058fcc8b7>] sg_alloc_table_from_pages_segment+0x3c/0x114
[<00000000a37ae8d3>] iommu_dma_get_sgtable+0xa4/0x110
[<000000002c697e39>] dma_get_sgtable_attrs+0x28/0x50
[<000000000872c5af>] mtk_gem_prime_get_sg_table+0x64/0xc0
[<000000006b9e7591>] mtk_drm_gem_prime_vmap+0x60/0x130
[<00000000b73a0770>] drm_gem_vmap+0x2c/0x90
[<0000000034e08004>] drm_client_buffer_vmap+0x2c/0x4c
[<00000000bff437f7>] drm_fb_helper_generic_probe+0x178/0x230
[<00000000dcd73dff>] drm_fb_helper_single_fb_probe+0x2cc/0x530
[<000000001980a8a1>] __drm_fb_helper_initial_config_and_unlock+0x48/0x140
[<000000007b1bea4e>] drm_fbdev_client_hotplug+0x13c/0x18c
[<00000000a7d9a8ba>] drm_client_register+0x64/0xa4
[<00000000106a744f>] drm_fbdev_generic_setup+0xd0/0x19c
[<0000000070423ecc>] mtk_drm_bind+0x11c/0x1a0
[Fix]
https://lore.kernel.org/lkml/68a9a139-922b-93ae-0f4d-ee36b3610...@loongson.cn/T/
https://lore.kernel.org/linux-arm-kernel/20231004083226.1940055-1-we...@chromium.org/
[Test]
1. enable CONFIG_DEBUG_KMEMLEAK
2. cat /sys/kernel/debug/kmemleak
[Where problems could occur]
none. the chance should be low.
LP: #2073823
** Affects: linux-mtk (Ubuntu)
Importance: Undecided
Assignee: Jian Hui Lee (jianhuilee)
Status: New
** Affects: linux-mtk (Ubuntu Jammy)
Importance: Undecided
Assignee: Jian Hui Lee (jianhuilee)
Status: New
** Also affects: linux-mtk (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: linux-mtk (Ubuntu)
Assignee: (unassigned) => Jian Hui Lee (jianhuilee)
** Changed in: linux-mtk (Ubuntu Jammy)
Assignee: (unassigned) => Jian Hui Lee (jianhuilee)
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https://bugs.launchpad.net/bugs/2081686
Title:
[g1200] possible kernel memory leak through CONFIG_DEBUG_KMEMLEAK
Status in linux-mtk package in Ubuntu:
New
Status in linux-mtk source package in Jammy:
New
Bug description:
[Impact]
After enable CONFIG_DEBUG_KMEMLEAK, Kmemleak detects potential leak.
root@mtk-genio:/home/gjiang# cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff0000dad64400 (size 512):
comm "kworker/u16:3", pid 146, jiffies 4294896229 (age 8550.412s)
hex dump (first 32 bytes):
00 40 19 03 00 fc ff ff 00 00 00 00 00 00 10 00 .@..............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000ce19c3ae>] __kmalloc+0x260/0x410
[<00000000a3612fef>] sg_alloc_append_table_from_pages+0x324/0x490
[<0000000058fcc8b7>] sg_alloc_table_from_pages_segment+0x3c/0x114
[<00000000a37ae8d3>] iommu_dma_get_sgtable+0xa4/0x110
[<000000002c697e39>] dma_get_sgtable_attrs+0x28/0x50
[<000000000872c5af>] mtk_gem_prime_get_sg_table+0x64/0xc0
[<000000006b9e7591>] mtk_drm_gem_prime_vmap+0x60/0x130
[<00000000b73a0770>] drm_gem_vmap+0x2c/0x90
[<0000000034e08004>] drm_client_buffer_vmap+0x2c/0x4c
[<00000000bff437f7>] drm_fb_helper_generic_probe+0x178/0x230
[<00000000dcd73dff>] drm_fb_helper_single_fb_probe+0x2cc/0x530
[<000000001980a8a1>] __drm_fb_helper_initial_config_and_unlock+0x48/0x140
[<000000007b1bea4e>] drm_fbdev_client_hotplug+0x13c/0x18c
[<00000000a7d9a8ba>] drm_client_register+0x64/0xa4
[<00000000106a744f>] drm_fbdev_generic_setup+0xd0/0x19c
[<0000000070423ecc>] mtk_drm_bind+0x11c/0x1a0
[Fix]
https://lore.kernel.org/lkml/68a9a139-922b-93ae-0f4d-ee36b3610...@loongson.cn/T/
https://lore.kernel.org/linux-arm-kernel/20231004083226.1940055-1-we...@chromium.org/
[Test]
1. enable CONFIG_DEBUG_KMEMLEAK
2. cat /sys/kernel/debug/kmemleak
[Where problems could occur]
none. the chance should be low.
LP: #2073823
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https://bugs.launchpad.net/ubuntu/+source/linux-mtk/+bug/2081686/+subscriptions
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