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a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=8nJEP1OIZ-IA:10 a=HzLeVaNsDn8A:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=igv6b8l3P8z7-IIQU3wA:9 a=3ZKOabzyN94A:10 a=wPNLvfGTeEIA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjEyMDE0MiBTYWx0ZWRfX3A4N8daP612/ oyv/oTBl7MaKCvGBUPdG5Vj++Qe230Vd9Eu2xxBye4VGEsen14cnwBrUFjXQBkUH3R3nNLvVDaO fFQND9LUkco6s3JQZMyil3Nl4aLOUj4W3L7uXkKdAh4r4gRdxAfYyxvKcTAPnCbN15yBMAc6Ucg B53jZ25+UB5E1B28pFnVE87Mer/v1ezHVl38VFmqVX/2cldp4UtyZVgjLi7aR8QWvWh1D8lfIQw NxIdLRgpI/YlJmB71JU5oMrWsNpEOf7VxnyLembDzFKlGygv9ZUagLnK3bm9/PeUSaNaBpQU0YT 6B/K+zH6Crw6nUb5qbXgEwyWeK4fjUQeVBFYgGHBKR0UqhrPNhSUFsiU5Z8o46stcNzjwNxhre7 KNSELjbqWuGF007R7qXZwdlanPNRtBw+DaVHwETPtBybPfT2wJdpn/KOO350ERlIoBrZyeXPGMz po6kQELd/B39h50tY8Q== X-Proofpoint-ORIG-GUID: VH-4pMGp_TyiRf09ULgj_RDZBM2UNliG X-Proofpoint-GUID: VH-4pMGp_TyiRf09ULgj_RDZBM2UNliG Here is the problem: prf = mapp->pr_file; if (prf == NULL || (mapp = prf->first_segment) == NULL) { fuse_log(FUSE_LOG_ERR, "%i: dtprobed: cannot look up mapping (process dead?)\n", pid); goto out; } else if ((fn = Pmap_mapfile_name(P, mapp)) == NULL) { fuse_log(FUSE_LOG_ERR, "%i: dtprobed: cannot look up mapname (process dead?)\n", pid); goto out; } mod = strrchr(fn, '/'); if (mod) mod++; else mod = fn; Since you changed this to get the mapping filename in map_files, you get a name that has the address range as its filename, and since that gets used as the module name, you end up with the wrong module name in the probe spec. It needs to be the actual filename of the source file that the mapping came from. On Thu, Feb 12, 2026 at 06:18:25PM +0000, Nick Alcock wrote: > On 12 Feb 2026, Eugene Loh outgrape: > > > I do not know what went wrong here.  I would have bet big money that I > > tested this, but here is what I find now with this patch: > > So did I! > > > test/unittest/usdt/tst.enabled.sh: Running timeout --signal=TERM 41 test/unittest/usdt/tst.enabled.sh /home/.../build/dtrace > > FAIL: expected results differ. > > 400000-401000:main:go > > > > Diff against expected: > > --- test/unittest/usdt/tst.enabled.r    2026-02-12 05:31:24.000000000 +0000 > > +++ /tmp/runtest.6196/test.out  2026-02-12 18:09:58.980466976 +0000 > > @@ -1,2 +1,2 @@ > > -test:main:go > > +400000-401000:main:go > > This suggests that symbol lookup is failing, which it shouldn't be, > because that *too* uses /proc/$pid/map_files, or should. > > I clearly need to debug this. Got a system on which it goes wrong?