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info：
arch=x86_64
WARNING: stack recursion on stack type 4
WARNING: can't dereference registers at 00000000f16b821d for ip swapgs_restore_regs_and_return_to_usermode+0x79/0x87
perf: interrupt took too long (237646 > 234126), lowering kernel.perf_event_max_sample_rate to 1000
perf: interrupt took too long (298340 > 297057), lowering kernel.perf_event_max_sample_rate to 1000
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zouyipeng
3年前
info：
arch=x86_64
WARNING: stack recursion on stack type 4
WARNING: can't dereference registers at 00000000f16b821d for ip swapgs_restore_regs_and_return_to_usermode+0x79/0x87
perf: interrupt took too long (237646 > 234126), lowering kernel.perf_event_max_sample_rate to 1000
perf: interrupt took too long (298340 > 297057), lowering kernel.perf_event_max_sample_rate to 1000
zouyipeng
3年前
In swapgs_restore_regs_and_return_to_usermode, after the stack is switched to the trampoline stack, the existing UNWIND_HINT_REGS hint is no longer valid, which can result in the following ORC unwinder warning:
WARNING: can't dereference registers at 000000003aeb0cdd for ip swapgs_restore_regs_and_return_to_usermode+0x93/0xa0
It's Allready Merged On stable-v4.19.y For More Detail Ref:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.19.y&id=ac069a960d357a7495fd2a1cde28d9b03250cace
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