Hello, Here is the 2nd version of the series to fix the stacktrace with kretprobe. The 1st series is here; https://lore.kernel.org/bpf/161495873696.346821.10161501768906432924.stgit@devnote2/ In this version I merged the ORC unwinder fix for kretprobe which discussed in the previous thread. [3/10] is updated according to the Miroslav's comment. [4/10] is updated for simplify the code. [5/10]-[9/10] are discussed in the previsous tread and are introduced to the series. Daniel, can you also test this again? I and Josh discussed a bit different method and I've implemented it on this version. This actually changes the kretprobe behavisor a bit, now the instraction pointer in the pt_regs passed to kretprobe user handler is correctly set the real return address. So user handlers can get it via instruction_pointer() API. Thank you, --- Josh Poimboeuf (1): x86/kprobes: Add UNWIND_HINT_FUNC on kretprobe_trampoline code Masami Hiramatsu (9): ia64: kprobes: Fix to pass correct trampoline address to the handler kprobes: treewide: Replace arch_deref_entry_point() with dereference_function_descriptor() kprobes: treewide: Remove trampoline_address from kretprobe_trampoline_handler() kprobes: stacktrace: Recover the address changed by kretprobe ARC: Add instruction_pointer_set() API ia64: Add instruction_pointer_set() API kprobes: Setup instruction pointer in __kretprobe_trampoline_handler x86/unwind/orc: Fixup kretprobe trampoline entry tracing: Remove kretprobe unknown indicator from stacktrace arch/arc/include/asm/ptrace.h | 5 ++ arch/arc/kernel/kprobes.c | 2 - arch/arm/probes/kprobes/core.c | 3 - arch/arm64/kernel/probes/kprobes.c | 3 - arch/csky/kernel/probes/kprobes.c | 2 - arch/ia64/include/asm/ptrace.h | 6 +++ arch/ia64/kernel/kprobes.c | 15 ++---- arch/mips/kernel/kprobes.c | 3 - arch/parisc/kernel/kprobes.c | 4 +- arch/powerpc/kernel/kprobes.c | 13 ----- arch/riscv/kernel/probes/kprobes.c | 2 - arch/s390/kernel/kprobes.c | 2 - arch/sh/kernel/kprobes.c | 2 - arch/sparc/kernel/kprobes.c | 2 - arch/x86/include/asm/unwind.h | 4 ++ arch/x86/include/asm/unwind_hints.h | 5 ++ arch/x86/kernel/kprobes/core.c | 5 +- arch/x86/kernel/unwind_orc.c | 16 +++++++ include/linux/kprobes.h | 41 +++++++++++++++-- kernel/kprobes.c | 84 +++++++++++++++++++++-------------- kernel/stacktrace.c | 22 +++++++++ kernel/trace/trace_output.c | 27 ++--------- lib/error-inject.c | 3 + 23 files changed, 170 insertions(+), 101 deletions(-) -- Masami Hiramatsu (Linaro) <mhiramat@xxxxxxxxxx>
