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From: "simark at simark dot ca" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug gdb/27526] Attaching to threaded process on glibc 2.33:
 libthread_db fails to initialize with "generic error"
Date: Fri, 05 Mar 2021 16:59:45 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27526

--- Comment #1 from Simon Marchi <simark at simark dot ca> ---
The stack trace where the lookup for _dl_stack_user happens:

#0  ps_pglobal_lookup (ph=3D0x60c000037fe8, obj=3D0x0, name=3D0x7fffde34e6bd
"_dl_stack_user", sym_addr=3D0x6170000477c8) at
/home/simark/src/binutils-gdb/gdb/proc-service.c:102
#1  0x00007fffde34c7cc in td_mod_lookup (ps=3D<optimized out>, mod=3Dmod@en=
try=3D0x0,
idx=3Didx@entry=3D54, sym_addr=3Dsym_addr@entry=3D0x6170000477c8) at
td_symbol_list.c:48
#2  0x00007fffde34b131 in __td_ta_stack_user (ta=3Dta@entry=3D0x61700004758=
0,
plist=3Dplist@entry=3D0x7fffffffb000) at td_thr_validate.c:32
#3  0x00007fffde349b8c in td_ta_map_lwp2thr (ta_arg=3D0x617000047580,
lwpid=3D1476836, th=3D0x7fffffffb0a0) at td_ta_map_lwp2thr.c:190
#4  0x000055555d54fbc2 in thread_from_lwp (stopped=3D0x61700003a700, ptid=
=3D...) at
/home/simark/src/binutils-gdb/gdb/linux-thread-db.c:415
#5  0x000055555d554b6b in try_thread_db_load_1 (info=3D0x60c000037fc0) at
/home/simark/src/binutils-gdb/gdb/linux-thread-db.c:912
#6  0x000055555d555837 in try_thread_db_load (library=3D0x555560734260
"libthread_db.so.1", check_auto_load_safe=3Dfalse) at
/home/simark/src/binutils-gdb/gdb/linux-thread-db.c:1014
#7  0x000055555d55689c in try_thread_db_load_from_sdir () at
/home/simark/src/binutils-gdb/gdb/linux-thread-db.c:1091
#8  0x000055555d557450 in thread_db_load_search () at
/home/simark/src/binutils-gdb/gdb/linux-thread-db.c:1146
#9  0x000055555d557d90 in thread_db_load () at
/home/simark/src/binutils-gdb/gdb/linux-thread-db.c:1203
#10 0x000055555d557e72 in check_for_thread_db () at
/home/simark/src/binutils-gdb/gdb/linux-thread-db.c:1246
#11 0x000055555d557fdf in thread_db_new_objfile (objfile=3D0x614000007040) =
at
/home/simark/src/binutils-gdb/gdb/linux-thread-db.c:1275
...

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