On Mar 07, 2023 / 16:57, Yu Kuai wrote: [...] > Thanks for the report, can you help to provide the result of add2line of > following? > > bfq_setup_cooperator+0x120b/0x1650 > bfq_setup_cooperator+0xa41/0x1650 > > That will help to locate the problem. Hi, Yu thanks for looking into this. Here are the faddr2line outputs: $ ./scripts/faddr2line vmlinux bfq_setup_cooperator+0x120b/0x1650 bfq_setup_cooperator+0x120b/0x1650: bfqq_process_refs at block/bfq-iosched.c:1200 (inlined by) bfq_setup_stable_merge at block/bfq-iosched.c:2855 (inlined by) bfq_setup_cooperator at block/bfq-iosched.c:2941 $ ./scripts/faddr2line vmlinux bfq_setup_cooperator+0xa41/0x1650 bfq_setup_cooperator+0xa41/0x1650: bfq_setup_cooperator at block/bfq-iosched.c:2939 -- Shin'ichiro Kawasaki