We experienced system hang when using ramoops/ftrace. To avoid the deadlock causing the hang, rebase the patch in the following link onto v5.10 as 4/9. 1/9, 2/9 and 3/9 are minimum basic change backported from mainline.
Link: https://lkml.org/lkml/2021/6/10/868 The code path of ftrace function tracer and the other users of it stays unchanged. This has been tested on arm64 and intel-x86-64 hardwares and qemu. He Zhe (4): ftrace: Move the recursion testing into global headers ftrace: Add ftrace_test_recursion_trylock() helper function pstore/ftrace: Add recursion protection to the ftrace callback pstore/ftrace: Add and use ftrace_test_recursion_trylock_safe fs/pstore/ftrace.c | 11 ++ include/linux/ftrace.h | 1 + include/linux/trace_recursion.h | 242 ++++++++++++++++++++++++++++++++ kernel/trace/trace.h | 156 -------------------- 4 files changed, 254 insertions(+), 156 deletions(-) create mode 100644 include/linux/trace_recursion.h -- 2.25.1
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