Hi, thanks for this report.
I've looked into these issues, and it seems like most of them are caused by
how GDB treats malloc function for evaluating expressions that require a
function call.
GDB seems to ignore that malloc has become n ifunc in Glibc and it tries to
access symbol 'malloc' directly.
It seems like GDB has been having some issues with ifuncs before, e.g. [1].
Simple way to reproduce the issue: use a program with just empty main function:
int main(void) { return 0; }
In GDB (not that __libc_malloc is the implementation that is returned by the
ifunc resolver):
(gdb) br main
(gdb) r
(gdb) disassemble __libc_malloc
Notice first 2 instructions
(gdb) call printf("%s\n", "hello")
Might result in SIGILL or SIGSEGV... but if it works, it prints format string
instead of 'hello'.
(gdb) disassemble __libc_malloc
Notice first 2 instructions have now been re-written with gibberish (hence the
signals).
I would appreciate if this could be looked at from the GDB point of view.
Perhaps,
this should be fixed in GDB?
FWIW, lldb works as expected.
Thanks,
Yury
---
[1]: https://sourceware.org/bugzilla/show_bug.cgi?id=28224
________________________________________
From: [email protected] <[email protected]>
Sent: 19 June 2026 06:40 AM
To: Yury Khrustalev
Cc: [email protected]
Subject: [Linaro-TCWG-CI] glibc-2.43.9000-403-g9ed3576e61f: 118 regressions on
aarch64
Dear contributor,
Our automatic CI has detected problems related to your patch(es). Please find
some details below.
In aarch64 native, after:
| commit glibc-2.43.9000-403-g9ed3576e61f
| Author: Yury Khrustalev <[email protected]>
| Date: Tue May 26 11:19:53 2026 +0100
|
| malloc: aarch64: Add ifuncs for malloc functions
|
| Introduce ifuncs and resolvers for functions pertinent to the
| malloc interface on the AArch64 target: malloc, calloc, free,
| realloc, memalign, valloc, pvalloc, posix_memalign, aligned_alloc,
| ... 13 lines of the commit log omitted.
Produces 118 regressions:
|
| regressions.sum:
| Running gdb:gdb.base/call-strs.exp ...
| FAIL: gdb.base/call-strs.exp: call str_func("a","b","c","d","e","f","g")
| FAIL: gdb.base/call-strs.exp: print str_func("a","b","c","d","e","f","g")
| Running gdb:gdb.base/callfuncs.exp ...
| FAIL: gdb.base/callfuncs.exp: noproto: p t_char_array_values("carray
1","carray 2")
| ... and 125 more
Used configuration :
*CI config* tcwg_gnu_native_check_gdb aarch64-linux-gnu
*configure and test flags:* none, autodetected on
aarch64-unknown-linux-gnu--disable-multilib --enable-fix-cortex-a53-835769
--enable-fix-cortex-a53-843419 --with-arch=armv8-a
We track this bug report under https://linaro.atlassian.net/browse/GNU-1934.
(Require Linaro login) Please let us know if you have a fix.
If you have any questions regarding this report, please ask on
[email protected] mailing list.
-----------------8<--------------------------8<--------------------------8<--------------------------
The information below contains the details of the failures, and the ways to
reproduce a debug environment:
You can find the failure logs in *.log.1.xz files in
*
http://54.172.246.49:9090/jobs/tcwg_gnu_native_check_gdb--master-aarch64-build/builds/10082/archive/artifacts/00-sumfiles/
The full lists of regressions and improvements as well as configure and make
commands are in
*
http://54.172.246.49:9090/jobs/tcwg_gnu_native_check_gdb--master-aarch64-build/builds/10082/archive/artifacts/notify/
The list of [ignored] baseline and flaky failures are in
*
http://54.172.246.49:9090/jobs/tcwg_gnu_native_check_gdb--master-aarch64-build/builds/10082/archive/artifacts/sumfiles/xfails.xfail
Current build :
http://54.172.246.49:9090/jobs/tcwg_gnu_native_check_gdb--master-aarch64-build/builds/10082/archive/artifacts/
Reference build :
http://54.172.246.49:9090/jobs/tcwg_gnu_native_check_gdb--master-aarch64-build/builds/10080/archive/artifacts/
Instruction to reproduce the build :
https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/glibc/sha1/9ed3576e61f7a87eb83d512531566f5e5d6bb032/tcwg_gnu_native_check_gdb/master-aarch64/reproduction_instructions.txt
Full commit :
https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=9ed3576e61f7a87eb83d512531566f5e5d6bb032
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