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Bug#1121448: marked as done (/usr/lib/linux-kbuild-6.18/tools/objtool/objtool: objtool crashes with coredump)

Your message dated Sun, 30 Nov 2025 23:20:30 +0100
with message-id <f6tpxfjx2z2bmxdbmlneql4gra2lt65vionzgluan37hcldzwa@rabqysftsno2>
and subject line Re: Bug#1121448: /usr/lib/linux-kbuild-6.18/tools/objtool/objtool: objtool crashes with coredump
has caused the Debian Bug report #1121448,
regarding /usr/lib/linux-kbuild-6.18/tools/objtool/objtool: objtool crashes with coredump
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
1121448: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1121448
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: linux-kbuild-6.18
Version: 6.18~rc7-1~exp1
Severity: normal
File: /usr/lib/linux-kbuild-6.18/tools/objtool/objtool

Dear Maintainer,

I'm trying to install the package *nvidia-kernel-dkms* (550.163.01-4) on my
system which triggers dkms. This fails, because objtool crashes. Here is the
core dump:

           PID: 219805 (objtool.real-x8)
           UID: 1000 (joerg)
           GID: 1000 (joerg)
        Signal: 11 (SEGV)
     Timestamp: Wed 2025-11-26 14:11:01 CET (3min 37s ago)
  Command Line: /usr/src/linux-headers-6.18-amd64/tools/objtool/objtool --hacks=jump_label --hacks=noinstr --hacks=skylake --ibt --orc --retpoline --rethunk --sls --static-call --uaccess --prefix=16 --link --module nvidia.o
    Executable: /usr/lib/linux-kbuild-6.18/tools/objtool/objtool.real-x86
 Control Group: /user.slice/user-1000.slice/user@1000.service/app.slice/app-gnome-xterm-31934.scope
          Unit: user@1000.service
     User Unit: app-gnome-xterm-31934.scope
         Slice: user-1000.slice
     Owner UID: 1000 (joerg)
       Boot ID: 31de29b563df4019b7e2ab8c62b9f795
    Machine ID: 523cb54753234ed08c13ec497d0d3b64
      Hostname: zenbook
       Storage: /var/lib/systemd/coredump/core.objtool\x2ereal-x8.1000.31de29b563df4019b7e2ab8c62b9f795.219805.1764162661000000.zst (present)
  Size on Disk: 110M
       Message: Process 219805 (objtool.real-x8) of user 1000 dumped core.

[New LWP 219805]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/src/linux-headers-6.18-amd64/tools/objtool/objtool --hacks=jump_label --ha'.
Program terminated with signal SIGSEGV, Segmentation fault.
Download failed: Invalid argument.  Continuing without source file ./tools/objtool/./tools/objtool/elf.c.
#0  find_reloc_by_dest_range (elf=0x5b04b9247c70, sec=sec@entry=0x5b04b924b820, offset=24, len=<optimized out>) at ./tools/objtool/elf.c:285

warning: 285    ./tools/objtool/elf.c: No such file or directory

Thread 1 (Thread 0x7941780f8f00 (LWP 219805)):
#0  find_reloc_by_dest_range (elf=0x5b04b9247c70, sec=sec@entry=0x5b04b924b820, offset=24, len=<optimized out>) at ./tools/objtool/elf.c:285
        reloc = 0xaaaaaaaaaaaaaaaa
        r = 0x7941727b3010
        rsec = 0x5b04b924b8e0
        o = 16
#1  0x00005b04b2253187 in insn_reloc (file=<optimized out>, insn=0x5b04b92bac40) at ./tools/objtool/check.c:1268
        reloc = <optimized out>
#2  add_jump_destinations (file=<optimized out>) at ./tools/objtool/check.c:1503
        func = 0x79417366fcd0
        __sec = 0x5b04b924b820
        __fake = <optimized out>
        insn = 0x5b04b92bac40
        jump_dest = <optimized out>
        reloc = <optimized out>
        dest_sec = <optimized out>
        dest_off = <optimized out>
        ret = <optimized out>
#3  decode_sections (file=file@entry=0x5b04b2279e80 <file>) at ./tools/objtool/check.c:2573
        ret = <optimized out>
#4  0x00005b04b2254c70 in check (file=file@entry=0x5b04b2279e80 <file>) at ./tools/objtool/check.c:4773
        ret = 0
        warnings = 0
#5  0x00005b04b225891a in objtool_run (argc=<optimized out>, argv=0x7fff8147cc08) at ./tools/objtool/builtin-check.c:328
        file = 0x5b04b2279e80 <file>
        ret = 0
#6  0x000079417820dca8 in __libc_start_call_main (main=main@entry=0x5b04b22456f0 <main>, argc=argc@entry=15, argv=argv@entry=0x7fff8147cc08) at ../sysdeps/nptl/libc_start_call_main.h:58
        self = <optimized out>
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140735362354184, 2401228595235890281, 0, 140735362354312, 133322097692672, 100075726927544, -2401014395131550615, -3184026318482856855}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7fff8147cc08, 0xf}, data = {prev = 0x0, cleanup = 0x0, canceltype = -2126001144}}}
        not_first_call = <optimized out>
#7  0x000079417820dd65 in __libc_start_main_impl (main=0x5b04b22456f0 <main>, argc=15, argv=0x7fff8147cc08, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff8147cbf8) at ../csu/libc-start.c:360
No locals.
#8  0x00005b04b2245761 in _start ()
No symbol table info available.
--- END ---


Best regards

Jörg

-- System Information:
Debian Release: forky/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.18-amd64 (SMP w/8 CPU threads; PREEMPT)
Kernel taint flags: TAINT_UNSIGNED_MODULE
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages linux-kbuild-6.18 depends on:
ii  libc6       2.41-12
ii  libelf1t64  0.194-1
ii  libssl3t64  3.5.4-1
ii  pahole      1.31-1
ii  python3     3.13.7-1
ii  zlib1g      1:1.3.dfsg+really1.3.1-1+b1

linux-kbuild-6.18 recommends no packages.

linux-kbuild-6.18 suggests no packages.

-- no debconf information

--- End Message ---
--- Begin Message --- 
Salvatore Bonaccorso schrieb am Mi 26. Nov, 19:15 (+0100):
> On Wed, Nov 26, 2025 at 05:54:39PM +0100, Jörg Sommer wrote:
> > Package: linux-kbuild-6.18
> > Version: 6.18~rc7-1~exp1

> I cannot reproduce this issue right now. Are you by chance while
> having the packages already updates running yet with the
> 6.18~rc6-1~exp1 kernel?
> 
> That one had the issue fixed with updating to 6.18~rc7, cf.
> https://bugs.debian.org/1121013 

Hi Salvatore,

pretty good guess. I've checked /proc/version, and yes, indeed I was still
running 6.18~rc6. After a reboot I could compile the nvidia module and other
strange problems (like broken sound of videos in Firefox) were gone.

Thanks for your help.


Best regards Jörg


-- 
Damit das Mögliche entsteht, muß immer wieder das Unmögliche versucht
werden.                                       (Hermann Hesse)

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