Fwd: BISECT result: 6.0.0-RC kernels trigger Firefox snap bug with 6.0.0-rc3 through 6.0.0-rc7

From: Mirsad Goran Todorovac
Date: Sat Oct 15 2022 - 10:59:59 EST

On 14. 10. 2022. 23:44, Mirsad Goran Todorovac wrote:
On 14. 10. 2022. 14:28, Bagas Sanjaya wrote:

On 10/14/22 17:32, Mirsad Todorovac wrote:
I tried the "make localmodconfig" and provided the default answers ([ENTER]) to all questions
the script asked as advised here: https://www.stolaf.edu/people/rab/os/linux-compile.html .

However, though it built much faster, the stripped version did not trigger the bug.

I am now trying to reproduce the bug with v6.0-rc[123] with config-{051913,060000}.
This brings a lot of combinations, and though I am a newbie, I noticed that build scripts
start with "make clean" for both deb-pkg and rpm-pkg.

Is there a way to rebuild only the stuff that changed between the versions?

You can try building kernel with ccache enabled. However, you'll need
to unset build timestamp, since it will make builds non-deterministic:

    make CC="ccache gcc" KBUILD_BUILD_TIMESTAMP=""

The first ccache build will be slower than normal build, because the
object files needs to be written twice (to the output directory and
to the cache), though.

Hi, Bagas,

Unfortunately, the ccache command did not work as expected. It still calls the gcc compiler proper,
even in the second run ...

PID USER      PR  NI    VIRT    RES    SHR S %CPU  %MEM TIME+ COMMAND
29213 root      20   0   67420  55100  15676 R  98.1   0.3 0:02.42 /opt/alt/python38/bin/python3 /usr/bin/imunify360-agent rstatus
29374 mtodorov  30  10  133932 110104  18408 R  98.1   0.7 0:01.46 /usr/lib/gcc/x86_64-linux-gnu/8/cc1 -quiet -nostdinc -I ./arch/x86/include -I ./arch/x86/include/generated -I ./include -I ./arc+
 1079 root      20   0  589008 371700   2320 S  97.1   2.3 2343:20 /usr/sbin/bacula-fd -f -c /etc/bacula/bacula-fd.conf
29425 mtodorov  30  10   95052  71520  16700 R  76.9   0.4 0:00.80 /usr/lib/gcc/x86_64-linux-gnu/8/cc1 -quiet -nostdinc -I ./arch/x86/include -I ./arch/x86/include/generated -I ./include -I ./arc+
29459 mtodorov  30  10   79268  51432  12732 R  46.2   0.3 0:00.48 /usr/lib/gcc/x86_64-linux-gnu/8/cc1 -quiet -nostdinc -I ./arch/x86/include -I ./arch/x86/include/generated -I ./include -I ./arc+
29462 mtodorov  30  10   65516  34828   9224 R  43.3   0.2 0:00.45 /usr/lib/gcc/x86_64-linux-gnu/8/cc1 -E -quiet -nostdinc -I ./arch/x86/include -I ./arch/x86/include/generated -I ./include -I ./+
29505 mtodorov  30  10       0      0      0 R  32.7   0.0 0:00.34 [cc1]
29506 mtodorov  30  10   65940  38560  12576 R  32.7   0.2 0:00.34 /usr/lib/gcc/x86_64-linux-gnu/8/cc1 -quiet -nostdinc -I ./arch/x86/include -I ./arch/x86/include/generated -I ./include -I ./arc+
29523 mtodorov  30  10   52180  21572   9344 R  17.3   0.1 0:00.18 /usr/lib/gcc/x86_64-linux-gnu/8/cc1 -E -quiet -nostdinc -I ./arch/x86/include -I ./arch/x86/include/generated -I ./include -I ./+
 5517 root      20   0  780956  77812  10052 S  11.5   0.5 466:39.30 /opt/alt/python38/bin/python3 -m im360.run
29384 mtodorov  30  10    7132   3964   3568 S  11.5   0.0 0:00.12 /usr/local/bin/ccache gcc -Wp,-MMD,sound/i2c/other/.ak4114.o.d -nostdinc -I./arch/x86/include -I./arch/x86/include/generated -I.+
29407 mtodorov  30  10    7116   3748   3360 S  10.6   0.0 0:00.11 /usr/local/bin/ccache gcc -Wp,-MMD,fs/exfat/.nls.o.d -nostdinc -I./arch/x86/include -I./arch/x86/include/generated -I./include -+
29451 mtodorov  30  10    7132   3968   3568 S   9.6   0.0 0:00.10 /usr/local/bin/ccache gcc -Wp,-MMD,drivers/pinctrl/intel/.pinctrl-tigerlake.o.d -nostdinc -I./arch/x86/include -I./arch/x86/incl+
29522 mtodorov  30  10    8288   7520   1468 R   8.7   0.0 0:00.09 scripts/genksyms/genksyms -r /dev/null
29524 mtodorov  30  10   17008  12480   3204 R   4.8   0.1 0:00.05 as -I ./arch/x86/include -I ./arch/x86/include/generated -I ./include -I ./arch/x86/include/uapi -I ./arch/x86/include/generated+
 8896 mtodorov  20   0   12212   4616   3348 R   3.8   0.0 0:04.58 top

29525 mtodorov  30  10   15028  10412 3248 R   3.8   0.1 0:00.04 as -I ./arch/x86/include -I ./arch/x86/include/generated -I ./include -I ./arch/x86/include/uapi -I ./arch/x86/include/generated+

I used the command line:
$ make CC="/usr/local/bin/ccache gcc" KBUILD_BUILD_TIMESTAMP="" -j10 deb-pkg

I tried to install the latest ccache (version 4.6.3), but it silently calls cc1, despite having 4GiB of cache in $HOME/.ccache ...

I must be doing something wrong. Heavens are not aligned in favour to me this day :-/

Here are the results of the requested bisect on the bug involving the Firefox snap build 104.x, 105.0.x, squashfs and which was manifested on both Ubuntu snap and with snapd in AlmaLinux 8.6 (CentOS fork):

mtodorov@domac:~/linux/kernel/linux_stable$ git bisect log
git bisect start
# bad: [568035b01cfb107af8d2e4bd2fb9aea22cf5b868] Linux 6.0-rc1
git bisect bad 568035b01cfb107af8d2e4bd2fb9aea22cf5b868
# good: [51dd976781da8c0b47e106ed59a96d7c28972ce4] Linux 5.19.15
git bisect good 51dd976781da8c0b47e106ed59a96d7c28972ce4
# good: [3d7cb6b04c3f3115719235cc6866b10326de34cd] Linux 5.19
git bisect good 3d7cb6b04c3f3115719235cc6866b10326de34cd
# good: [b44f2fd87919b5ae6e1756d4c7ba2cbba22238e1] Merge tag 'drm-next-2022-08-03' of git://anongit.freedesktop.org/drm/drm
git bisect good b44f2fd87919b5ae6e1756d4c7ba2cbba22238e1
# good: [6614a3c3164a5df2b54abb0b3559f51041cf705b] Merge tag 'mm-stable-2022-08-03' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
git bisect good 6614a3c3164a5df2b54abb0b3559f51041cf705b
# bad: [eb5699ba31558bdb2cee6ebde3d0a68091e47dce] Merge tag 'mm-nonmm-stable-2022-08-06-2' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
git bisect bad eb5699ba31558bdb2cee6ebde3d0a68091e47dce
# good: [24df5428ef9d1ca1edd54eca7eb667110f2dfae3] ALSA: hda/realtek: Add quirk for HP Spectre x360 15-eb0xxx
git bisect good 24df5428ef9d1ca1edd54eca7eb667110f2dfae3
# good: [c993e07be023acdeec8e84e2e0743c52adb5fc94] Merge tag 'dma-mapping-5.20-2022-08-06' of git://git.infradead.org/users/hch/dma-mapping
git bisect good c993e07be023acdeec8e84e2e0743c52adb5fc94
# good: [4cfa6ff24a9744ba484521c38bea613134fbfcb3] powerpc/64e: Fix kexec build error
git bisect good 4cfa6ff24a9744ba484521c38bea613134fbfcb3
# good: [24cb958695724ffb4488ef4f65892c0767bcd2f2] Merge tag 's390-5.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
git bisect good 24cb958695724ffb4488ef4f65892c0767bcd2f2
# good: [db98b43086275350294f5c6f797249b714d6316d] squashfs: always build "file direct" version of page actor
git bisect good db98b43086275350294f5c6f797249b714d6316d
# good: [6ba592fa014f21f35a8ee8da4ca7b95a018f13e8] video: fbdev: s3fb: Check the size of screen before memset_io()
git bisect good 6ba592fa014f21f35a8ee8da4ca7b95a018f13e8
# good: [b5a8466d37d30cfcc8015789f4a3f0c44b6c7bc6] Merge tag 'for-5.20/fbdev-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/linux-fbdev
git bisect good b5a8466d37d30cfcc8015789f4a3f0c44b6c7bc6
# bad: [97d3b2676fc6bc4865eb825037f4492f0fb804eb] ocfs2: remove some useless functions
git bisect bad 97d3b2676fc6bc4865eb825037f4492f0fb804eb
# bad: [591c32bddbe20ba0e172d9def3c7f22b9c926ad9] kernel/hung_task: fix address space of proc_dohung_task_timeout_secs
git bisect bad 591c32bddbe20ba0e172d9def3c7f22b9c926ad9
# bad: [b09a7a036d2035b14636cd4c4c69518d73770f65] squashfs: support reading fragments in readahead call
git bisect bad b09a7a036d2035b14636cd4c4c69518d73770f65
mtodorov@domac:~/linux/kernel/linux_stable$

The git bisect stopped at the squashfs commit b09a7a036d2035b14636cd4c4c69518d73770f65, so I included Phillip in Cc:, according to the Code of Conduct.

Have a nice day!

Kind regards,
Mirsad

(This is a re-send because Thunderbird automatically send MIME unless I explicitly set text/plain.)

--
Mirsad Goran Todorovac
Sistem inženjer
Grafički fakultet | Akademija likovnih umjetnosti
Sveučilište u Zagrebu
--
System engineer
Faculty of Graphic Arts | Academy of Fine Arts
University of Zagreb, Republic of Croatia
The European Union