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https://github.com/edk2-porting/linux-next.git
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59d2d18cc4
If CONFIG_ARCH_DMA_ADDR_T_64BIT enabled for x86 systems and physical
memory is more than 4GB, dma_map_page may return a valid memory
address which greater than 0xffffffff. As a result, the mlx5 device page
allocator RB tree will be initialized with valid addresses greater than
0xfffffff.
However, (addr & PAGE_MASK) set the high four bytes to zeros. So, it's
impossible for the function, free_4k, to release the pages whose
addresses greater than 4GB. Memory leaks. And mlx5_ib module can't
release the pages when user try to remove the module, as a result,
system hang.
[root@rdma05 root]# dmesg | grep addr | head
addr = 3fe384000
addr & PAGE_MASK = fe384000
[root@rdma05 root]# rmmod mlx5_ib <---- hang on
---------------------- cosnole log -----------------
mlx5_ib 0000:04:00.0: irq 138 for MSI/MSI-X
alloc irq_desc for 139 on node -1
alloc kstat_irqs on node -1
mlx5_ib 0000:04:00.0: irq 139 for MSI/MSI-X
0000:04:00.0:free_4k:221:(pid 1519): page not found
0000:04:00.0:free_4k:221:(pid 1519): page not found
0000:04:00.0:free_4k:221:(pid 1519): page not found
0000:04:00.0:free_4k:221:(pid 1519): page not found
---------------------- cosnole log -----------------
Fixes:
|
||
|---|---|---|
| .. | ||
| alloc.c | ||
| cmd.c | ||
| cq.c | ||
| debugfs.c | ||
| eq.c | ||
| fw.c | ||
| health.c | ||
| Kconfig | ||
| mad.c | ||
| main.c | ||
| Makefile | ||
| mcg.c | ||
| mlx5_core.h | ||
| mr.c | ||
| pagealloc.c | ||
| pd.c | ||
| port.c | ||
| qp.c | ||
| srq.c | ||
| uar.c | ||