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a=xqWC_Br6kY4A:10 a=vUbySO9Y5rIA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=NEAV23lmAAAA:8 a=VwQbUJbxAAAA:8 a=yPCof4ZbAAAA:8 a=RBgWSan9oGArEJNKI9sA:9 cc=ntf awl=host:13644 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTIzMDE0NiBTYWx0ZWRfXzSy2ndLHpbM0 x1Lh7KU24MtyAyFkRsCjFa3lKQzxheILYSnonJah8/zYlhwNzELMjrpqoQSor9xzBA3KCwBB1ax CnVXeohUmTMMZcCxtLipE4dGVO9qghS0Wer7ZxXHrmkFcICs8VnVeMSa5xJ7mVvSwDOSCuCsR/K goiBg9xWQ6KHdDTjKX/03Qqi/A+tChqrNZGW0dfD1kEY2sPI4cg29U1Is3hUOW2CH8thOnZXaBS V8+3WyCYODgHC+j8FOPBafxSiihnKoAX1CGwImUhJ13ZNjC6gzwvqf+AnY6r8PtS+YCS9AzBd54 TOZIzidR4rQRsCSVUQTgLXLhOM0kqtGEnOojOis/ZQ3Eap6UvGyRs+ALdr7H98WhM43IUvIb+7r g1iV5BFjia9SM1PxXfffcLtCfs//Gh5GprENIYbXeDHPfkQrXFAo+8iZEpugG0nIz8GM7e2LFwZ gu6lMDRvwicN18Ul8mbmc2CD82h69qdt7uXblba0= X-Proofpoint-ORIG-GUID: RalUVigmXEJCwaOdlVvIYx9-uDYw7JXR X-Proofpoint-GUID: RalUVigmXEJCwaOdlVvIYx9-uDYw7JXR On 21 Jan 2026, eugene loh told this: > From: Eugene Loh > > For most probes, bpf_get_stack() strips off artificial BPF JIT stack > frames. In a few cases -- like fprobes and rawtp -- we have to skip > the first few frames manually. Typically, we should skip 3 frames > (trampoline, clause, and the bpf_get_stack call itself). Further, > our BPF functions like > get_bvar_caller() > get_bvar_stackdepth() > get_bvar_ucaller() > get_bvar_ustackdepth() > skip an additional frame to account for that call. > > Change stack_skip to 3 for the dt_fbt_fprobe and dt_rawtp providers. > > This raises the thorny question of testing. Until recently, the > stack_skip value we had been using -- 4, not 3 -- worked since it was > chosen empirically: there was a bug in the kernel that added an extra > frame. But now, the kernel situation is muddled. The bug has been > fixed in recent kernels, but only for x86. See > > https://github.com/torvalds/linux/commit/6d08340d1e354787d6c65a8c3cdd4d41ffb8a5ed > Revert "perf/x86: Always store regs->ip in perf_callchain_kernel()" > > A broader fix, for non-x86, is also expected. See the thread that > starts at: > https://lore.kernel.org/all/a38fed68-67bc-98ce-8e12-743342121ae3@oracle.com/ > > So, for now, XFAIL tests on "unfixed" (older) kernels. > > Orabug: 38776929 > Signed-off-by: Eugene Loh Reviewed-by: Nick Alcock (verified that it fixes these tests and doesn't break older kernels, which XFAIL with the appropriate message.) -- NULL && (void)