From: Dave Rigby d.rigby@me.com
commit 4e1481445407b86a483616c4542ffdc810efb680 upstream.
When locating the DWARF module for a given address, __find_debuginfo() requires a 'struct dso' passed via the userdata argument.
However, this field is only set in __report_module() if the module is found in via dwfl_addrmodule(), not if it is found later via dwfl_report_elf().
Set userdata irrespective of how the DWARF module was found, as long as we found a module.
Fixes: bf53fc6b5f41 ("perf unwind: Fix separate debug info files when using elfutils' libdw's unwinder") Signed-off-by: Dave Rigby d.rigby@me.com Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=211801 Acked-by: Jan Kratochvil jan.kratochvil@redhat.com Acked-by: Jiri Olsa jolsa@redhat.com Link: https://lore.kernel.org/linux-perf-users/20210218165654.36604-1-d.rigby@me.c... Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Cc: "Tommi Rantala" tommi.t.rantala@nokia.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/perf/util/unwind-libdw.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)
--- a/tools/perf/util/unwind-libdw.c +++ b/tools/perf/util/unwind-libdw.c @@ -60,10 +60,8 @@ static int __report_module(struct addr_l mod = dwfl_addrmodule(ui->dwfl, ip); if (mod) { Dwarf_Addr s; - void **userdatap;
- dwfl_module_info(mod, &userdatap, &s, NULL, NULL, NULL, NULL, NULL); - *userdatap = dso; + dwfl_module_info(mod, NULL, &s, NULL, NULL, NULL, NULL, NULL); if (s != al->map->start - al->map->pgoff) mod = 0; } @@ -79,6 +77,13 @@ static int __report_module(struct addr_l al->map->start - al->map->pgoff, false); }
+ if (mod) { + void **userdatap; + + dwfl_module_info(mod, &userdatap, NULL, NULL, NULL, NULL, NULL, NULL); + *userdatap = dso; + } + return mod && dwfl_addrmodule(ui->dwfl, ip) == mod ? 0 : -1; }