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can't unwind through trampoline created by uprobe #19

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lchannng opened this issue Oct 26, 2022 · 0 comments

lchannng commented Oct 26, 2022

Hi,

I'm writing a eBPF-based profiler for C++ and Lua script recently, I unwind stacks in BPF similar to what cargo-trace does.

I found that stask frames always break when rip goes into address range of uprobes, because no unwind rules for uprobe trampoline in dwarf.

7ffdb018c000-7ffdb018e000 r-xp 00000000 00:00 0 [vdso]
7fffffffe000-7ffffffff000 --xp 00000000 00:00 0 [uprobes]
ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0 [vsyscall]

I have no idea how to unwind through it. Any suggestions?

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