kernel hang
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johnpeng
Mar 5, 2021, 5:07:53 PM3/5/21
to opennetworklinux
1,when user code try mmap the pcie bar while the kernel driver code "pgprot_noncached,remap_pfn_range",the console BLOCK and kernel cann't be ping successfully; kdb sysrq is also not trigger;(without more info)
2,if mmap len<8m, it is ok but the device 128M,The larger the mapping length, the sooner the subsequent user code hang ,（It has nothing to do with whether to access the pcie address，only mmap called）;
3, check /proc/xxx/pid , mtrr pat OK ,addr not conflict
4,cpu x86 ATOM3558, onl kernel vesioon 4.9 4.14;
5,ulimit unlimited stack, vme count not effective
who can give me some suggestion, kernel boot param or feature needed? thanks
2,if mmap len<8m, it is ok but the device 128M,The larger the mapping length, the sooner the subsequent user code hang ,（It has nothing to do with whether to access the pcie address，only mmap called）;
3, check /proc/xxx/pid , mtrr pat OK ,addr not conflict
4,cpu x86 ATOM3558, onl kernel vesioon 4.9 4.14;
5,ulimit unlimited stack, vme count not effective
who can give me some suggestion, kernel boot param or feature needed? thanks
johnpeng
Mar 6, 2021, 3:21:56 AM3/6/21
to opennetworklinux
It needs to be explained that mmap always returned success
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