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

From: Phillip Lougher
Date: Sun Oct 16 2022 - 15:59:18 EST

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On 16/10/2022 16:55, Mirsad Goran Todorovac wrote:

On 15. 10. 2022. 22:59, Phillip Lougher wrote:

Thorsten Leemhuis<regressions@xxxxxxxxxxxxx> wrote:

Topposting, to make this easier to access for everyone.

@Mirsad, thx for bisecting.

@Phillip: if you want to see a problem description and the whole
backstory of the problem that apparently is caused by     b09a7a036d20
("squashfs: support reading fragments in readahead call"), see this
thread (Mirsad sadly started a new one with the quoted mail below):
https://lore.kernel.org/all/b0c258c3-6dcf-aade-efc4-d62a8b3a1ce2@xxxxxxxxxxxx/

The above backstory tends to suggest data corruption which is happening
after a couple of hours especially on heavy loads, e.g. the comment

On 10/3/22 at 4:18 AM, Mirsad Goran Todorovac wrote:
The bug usually isn't showing immediately, but after a couple of hours
of running (especially with multimedia running inside Firefox).

Which is typically caused by double freed buffers or race conditions in
freeing and reusing.

Thanks Mirsad for the following

On Sat, 15 Oct 2022 16:59:44 +0200, Mirsad Goran Todorovac wrote:

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.

Which identified the "squashfs: support reading fragments in readahead call"
patch.

There is a race-condition introduced in that patch, which involves cache
releasing and reuse.

The following diff will fix that race-condition. It would be great if
someone could test and verify before sending it out as a patch.

Thanks

Phillip

diff --git a/fs/squashfs/file.c b/fs/squashfs/file.c
index e56510964b22..6cc23178e9ad 100644
--- a/fs/squashfs/file.c
+++ b/fs/squashfs/file.c
@@ -506,8 +506,9 @@ static int squashfs_readahead_fragment(struct page **page,
          squashfs_i(inode)->fragment_size);
      struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
      unsigned int n, mask = (1 << (msblk->block_log - PAGE_SHIFT)) - 1;
+    int error = buffer->error;
-    if (buffer->error)
+    if (error)
          goto out;
      expected += squashfs_i(inode)->fragment_offset;
@@ -529,7 +530,7 @@ static int squashfs_readahead_fragment(struct page **page,
out:
      squashfs_cache_put(buffer);
-    return buffer->error;
+    return error;
}
static void squashfs_readahead(struct readahead_control *ractl)

Dear Phillip,

I am sorry to have to disappoint you.

Having applied the patch to the version 6.0.1. The first run succeeded, but the second (after quit and restart from toolbar) run's results are still not good:

Tracking down bugs of this sort is always a process of elimination,
and gathering information to pinpoint the exact circumstances of why
it is triggering.

Next step is to download the exact snap(s) where the problems are occurring, as this may provide some insights.

I don't run Ubuntu, and I don't use snaps. Can you provide the
download link(s) of the snap(s) that cause problems? If there's
any firefox snaps that don't cause problems those will be useful
too.

You don't mention if there's any errors present in "dmesg" when
this happens, and so I'm assuming there aren't any?

Phillip

marvin@marvin-IdeaPad-3-15ITL6:~$ sudo tail -300f /var/log/syslog | grep firefox
Oct 16 17:23:17 marvin-IdeaPad-3-15ITL6 systemd[1795]: Started snap.firefox.firefox.41ac7adc-efbd-4c47-bccb-06711efb7a2e.scope.
Oct 16 17:23:18 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[2556]: update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/cups/doc-root /usr/share/cups/doc-root none bind,ro 0 0): cannot create directory "/usr/share/cups/doc-root": permission denied
Oct 16 17:23:18 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[2556]: update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/gimp/2.0/help /usr/share/gimp/2.0/help none bind,ro 0 0): cannot create directory "/usr/share/gimp/2.0": permission denied
Oct 16 17:23:18 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[2556]: update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/libreoffice/help /usr/share/libreoffice/help none bind,ro 0 0): cannot create directory "/usr/share/libreoffice/help": permission denied
Oct 16 17:23:18 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[2556]: update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/xubuntu-docs /usr/share/xubuntu-docs none bind,ro 0 0): cannot open directory "/var/lib": permission denied
Oct 16 17:23:18 marvin-IdeaPad-3-15ITL6 kernel: [   25.654344] audit: type=1400 audit(1665933798.028:105): apparmor="DENIED" operation="mkdir" profile="snap-update-ns.firefox" name="/usr/share/cups/doc-root/" pid=2556 comm="5" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
Oct 16 17:23:18 marvin-IdeaPad-3-15ITL6 kernel: [   25.655141] audit: type=1400 audit(1665933798.028:106): apparmor="DENIED" operation="mkdir" profile="snap-update-ns.firefox" name="/usr/share/gimp/2.0/" pid=2556 comm="5" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
Oct 16 17:23:18 marvin-IdeaPad-3-15ITL6 kernel: [   25.655528] audit: type=1400 audit(1665933798.028:107): apparmor="DENIED" operation="mkdir" profile="snap-update-ns.firefox" name="/usr/share/libreoffice/help/" pid=2556 comm="5" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
Oct 16 17:23:18 marvin-IdeaPad-3-15ITL6 kernel: [   25.655671] audit: type=1400 audit(1665933798.028:108): apparmor="DENIED" operation="open" profile="snap-update-ns.firefox" name="/var/lib/" pid=2556 comm="5" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Oct 16 17:23:19 marvin-IdeaPad-3-15ITL6 firefox[2527]: Failed to load module "canberra-gtk-module"
Oct 16 17:23:19 marvin-IdeaPad-3-15ITL6 firefox[2527]: Failed to load module "canberra-gtk-module"
Oct 16 17:23:19 marvin-IdeaPad-3-15ITL6 kernel: [   27.287722] audit: type=1326 audit(1665933799.660:110): auid=1000 uid=1000 gid=1000 ses=3 subj=snap.firefox.firefox pid=2527 comm="firefox" exe="/snap/firefox/1943/usr/lib/firefox/firefox" sig=0 arch=c000003e syscall=314 compat=0 ip=0x7f54ec28673d code=0x50000
Oct 16 17:23:20 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[2527]: ATTENTION: default value of option mesa_glthread overridden by environment.
Oct 16 17:23:20 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[2527]: message repeated 2 times: [ ATTENTION: default value of option mesa_glthread overridden by environment.]
Oct 16 17:23:23 marvin-IdeaPad-3-15ITL6 snapd[817]: storehelpers.go:748: cannot refresh: snap has no updates available: "bare", "canonical-livepatch", "core", "core18", "core20", "firefox", "gnome-3-34-1804", "gnome-3-38-2004", "gtk-common-themes", "slack", "snap-store", "snapd", "zoom-client"
Oct 16 17:23:40 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[2527]: Missing chrome or resource URL: resource://gre/modules/UpdateListener.sys.mjs
Oct 16 17:23:55 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[3990]: [2022-10-16T15:23:55Z ERROR mp4parse] Found 2 nul bytes in "\0\0"
Oct 16 17:23:55 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[3990]: message repeated 3 times: [ [2022-10-16T15:23:55Z ERROR mp4parse] Found 2 nul bytes in "\0\0"]
Oct 16 17:23:56 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[3990]: [2022-10-16T15:23:56Z ERROR mp4parse] Found 2 nul bytes in "\0\0"
Oct 16 17:23:56 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[3990]: message repeated 3 times: [ [2022-10-16T15:23:56Z ERROR mp4parse] Found 2 nul bytes in "\0\0"]
Oct 16 17:23:58 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[3990]: [2022-10-16T15:23:58Z ERROR mp4parse] Found 2 nul bytes in "\0\0"
Oct 16 17:23:58 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[3990]: message repeated 3 times: [ [2022-10-16T15:23:58Z ERROR mp4parse] Found 2 nul bytes in "\0\0"]
Oct 16 17:24:14 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[4942]: XPCOMGlueLoad error for file /snap/firefox/1943/usr/lib/firefox/libmozgtk.so:
Oct 16 17:24:14 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[4942]: /snap/firefox/1943/gnome-platform/usr/lib/x86_64-linux-gnu/libXcomposite.so.1: unsupported version 0 of Verneed record
Oct 16 17:24:14 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[4942]: Couldn't load XPCOM.
Oct 16 17:24:19 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[4995]: XPCOMGlueLoad error for file /snap/firefox/1943/usr/lib/firefox/libmozgtk.so:
Oct 16 17:24:19 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[4995]: /snap/firefox/1943/gnome-platform/usr/lib/x86_64-linux-gnu/libXcomposite.so.1: unsupported version 0 of Verneed record
Oct 16 17:24:19 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[4995]: Couldn't load XPCOM.
Oct 16 17:24:21 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5033]: /snap/firefox/1943/usr/lib/firefox/firefox: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record
Oct 16 17:24:21 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5033]: message repeated 2 times: [ /snap/firefox/1943/usr/lib/firefox/firefox: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record]
Oct 16 17:24:21 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5033]: /snap/firefox/1943/usr/lib/firefox/firefox: error while loading shared libraries: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verneed record
Oct 16 17:24:27 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[4480]: Inconsistency detected by ld.so: ../elf/dl-runtime.c: 80: _dl_fixup: Assertion `ELFW(R_TYPE)(reloc->r_info) == ELF_MACHINE_JMP_SLOT' failed!
Oct 16 17:24:31 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5163]: /snap/firefox/1943/usr/lib/firefox/firefox: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record
Oct 16 17:24:31 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5163]: message repeated 2 times: [ /snap/firefox/1943/usr/lib/firefox/firefox: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record]
Oct 16 17:24:31 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5163]: /snap/firefox/1943/usr/lib/firefox/firefox: error while loading shared libraries: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verneed record
Oct 16 17:24:36 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5205]: /snap/firefox/1943/usr/lib/firefox/firefox: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record
Oct 16 17:24:36 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5205]: message repeated 2 times: [ /snap/firefox/1943/usr/lib/firefox/firefox: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record]
Oct 16 17:24:36 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5205]: /snap/firefox/1943/usr/lib/firefox/firefox: error while loading shared libraries: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verneed record
Oct 16 17:24:42 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5372]: /snap/firefox/1943/usr/lib/firefox/firefox: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record
Oct 16 17:24:42 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5372]: message repeated 2 times: [ /snap/firefox/1943/usr/lib/firefox/firefox: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record]
Oct 16 17:24:42 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5372]: /snap/firefox/1943/usr/lib/firefox/firefox: error while loading shared libraries: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verneed record
Oct 16 17:24:45 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5396]: /snap/firefox/1943/usr/lib/firefox/firefox: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record
Oct 16 17:24:45 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5396]: message repeated 2 times: [ /snap/firefox/1943/usr/lib/firefox/firefox: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record]
Oct 16 17:24:45 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5396]: /snap/firefox/1943/usr/lib/firefox/firefox: error while loading shared libraries: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verneed record
Oct 16 17:24:53 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5483]: /snap/firefox/1943/usr/lib/firefox/firefox: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record
Oct 16 17:24:53 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5483]: message repeated 2 times: [ /snap/firefox/1943/usr/lib/firefox/firefox: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record]
Oct 16 17:24:53 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5483]: /snap/firefox/1943/usr/lib/firefox/firefox: error while loading shared libraries: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verneed record
Oct 16 17:25:02 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[2527]: Missing chrome or resource URL: resource://gre/modules/UpdateListener.sys.mjs
Oct 16 17:25:07 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5514]: /snap/firefox/1943/usr/lib/firefox/pingsender: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record
Oct 16 17:25:07 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5514]: /snap/firefox/1943/usr/lib/firefox/pingsender: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record
Oct 16 17:25:07 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5514]: /snap/firefox/1943/usr/lib/firefox/pingsender: error while loading shared libraries: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verneed record
Oct 16 17:25:07 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[2764]: /snap/firefox/1943/usr/lib/firefox/firefox: symbol lookup error: /snap/firefox/1943/usr/lib/firefox/libmozsandbox.so: undefined symbol: , version
Oct 16 17:25:07 marvin-IdeaPad-3-15ITL6 systemd[1795]: snap.firefox.firefox.41ac7adc-efbd-4c47-bccb-06711efb7a2e.scope: Consumed 6min 11.938s CPU time.
Oct 16 17:26:22 marvin-IdeaPad-3-15ITL6 systemd[1795]: Started snap.firefox.firefox.8af6eb39-1ebc-4e81-a7c1-a6cc66e76eac.scope.
Oct 16 17:26:23 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5573]: /bin/bash: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verdef record
Oct 16 17:26:23 marvin-IdeaPad-3-15ITL6 firefox_firefox.desktop[5573]: /bin/bash: error while loading shared libraries: /lib/x86_64-linux-gnu/libdl.so.2: unsupported version 0 of Verneed record

I have double-checked that this version of the function is in my build tree:

static int squashfs_readahead_fragment(struct page **page,
        unsigned int pages, unsigned int expected)
{
        struct inode *inode = page[0]->mapping->host;
        struct squashfs_cache_entry *buffer = squashfs_get_fragment(inode->i_sb,
                squashfs_i(inode)->fragment_block,
                squashfs_i(inode)->fragment_size);
        struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
        unsigned int n, mask = (1 << (msblk->block_log - PAGE_SHIFT)) - 1;
        int error = buffer->error;

        if (error)
                goto out;

        expected += squashfs_i(inode)->fragment_offset;

        for (n = 0; n < pages; n++) {
                unsigned int base = (page[n]->index & mask) << PAGE_SHIFT;
                unsigned int offset = base + squashfs_i(inode)->fragment_offset;

                if (expected > offset) {
                        unsigned int avail = min_t(unsigned int, expected -
                                offset, PAGE_SIZE);

                        squashfs_fill_page(page[n], buffer, offset, avail);
                }

                unlock_page(page[n]);
                put_page(page[n]);
        }

out:
        squashfs_cache_put(buffer);
        return error;
}

The same set of Firefox windows and tabs loaded correctly once switching back to the 5.19.13 kernel image.

The same applies for running the same setup with the home-built "Linux 5.19.15-20221014-conf051913ub x86_64": No Verdef nor Verneed error messages.

Have a nice day, and good bug hunting!

Regards,
Mirsad

--
Mirsad Goran Todorovac
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Grafički fakultet | Akademija likovnih umjetnosti
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