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a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=yPCof4ZbAAAA:8 a=NEAV23lmAAAA:8 a=hnwMpiV-vuxu4JJv9ZEA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTE0MDE0OCBTYWx0ZWRfX012jnpugz98b k0p5ETZ0mdTX+ERMWVqN5GBc1GfyGziLTlW4ycW2x7zU1wkTuyzFjylvMJqUD2N9RAu+62u5mcZ HZCB5XGLk2TKHB+Q9EIAv0YufJckwI1zqN7uu6FUuRej7NC1kI5LScrtJE9/96Z4T103o015cM/ fDWxsLGGMMVkuCI2M1LEe1xYVD7QoIcd6Sc7ah4HIiEsx+/lhHuzpvxzfHI1WEYpDUmwX166xMY bZ91B3hHmdgR5aKDc51kbYGzVv5O+rLoXoZk84syDiQWLOOgg0OqBV4+2LKOmULusGSmPOFv57/ jxx6+WaZV2ieK2LuuSRGINtGlok+Neult56T048U1Qy6RUGghiyUs2Nc6Xd1Or/bpg05wwJkLFL zXCHw3tvy+p2GbsoeJu/nPDqZHKMw+RKDswbtwoLwwOK7FDHGb7ackaGaBUt4yIudfuPwn5r4lM +8woX8GeOJWRVyrQBig== On 14/01/2026 15:09, Tao Chen wrote: > Hi guys, > > When using tracepoints to retrieve stack information, I observed that perf_trace_sched_migrate_task was printed twice. And the issue also occurs with tools using libbpf. > You may need the fix Jiri provided for x86_64 [1]. Eugene mentioned that the issue persists for arm64 however [2]. Alan [1] https://lore.kernel.org/bpf/20251104215405.168643-2-jolsa@kernel.org/ [2] https://lore.kernel.org/all/a38fed68-67bc-98ce-8e12-743342121ae3@oracle.com/ > sudo bpftrace -e ' > tracepoint:sched:sched_migrate_task { > printf("Task %s migrated by:\n", args->comm); > print(kstack); > }' > > Task kcompactd0 migrated by: > >         perf_trace_sched_migrate_task+9 >         perf_trace_sched_migrate_task+9 >         set_task_cpu+353 >         detach_task+77 >         detach_tasks+281 >         sched_balance_rq+452 >         sched_balance_newidle+504 >         pick_next_task_fair+84 >         __pick_next_task+66 >         pick_next_task+43 >         __schedule+332 >         schedule+41 >         schedule_hrtimeout_range+239 >         do_poll.constprop.0+668 >         do_sys_poll+499 >         __x64_sys_ppoll+220 >         x64_sys_call+5722 >         do_syscall_64+126 >         entry_SYSCALL_64_after_hwframe+118 > > Task jbd2/sda2-8 migrated by: > >         perf_trace_sched_migrate_task+9 >         perf_trace_sched_migrate_task+9 >         set_task_cpu+353 >         try_to_wake_up+365 >         default_wake_function+26 >         autoremove_wake_function+18 >         __wake_up_common+118 >         __wake_up+55 >         __jbd2_log_start_commit+195 > > env: > bpftrace v0.21.2 > ubuntu24.04，6.14.0-36-generic > > The issue is as follows: > https://github.com/bpftrace/bpftrace/issues/4949 > > > It seems that there is no special handling in the kernel. > Does anyone has thoughts on this issue. Thanks. > > BPF_CALL_4(bpf_get_stack_raw_tp, struct bpf_raw_tracepoint_args *, args, >            void *, buf, u32, size, u64, flags) > { >         struct pt_regs *regs = get_bpf_raw_tp_regs(); >         int ret; > >         if (IS_ERR(regs)) >                 return PTR_ERR(regs); > >         perf_fetch_caller_regs(regs); >         ret = bpf_get_stack((unsigned long) regs, (unsigned long) buf, >                             (unsigned long) size, flags, 0); >         put_bpf_raw_tp_regs(); >         return ret; > } >