linux-kernel - Re: [syzbot] [fs?] BUG: unable to handle kernel NULL pointer dereference in read_cache

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Message-ID: <670d8bb8.050a0220.f16b.0002.GAE@google.com>
Date: Mon, 14 Oct 2024 14:23:04 -0700
From: syzbot <syzbot+4089e577072948ac5531@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, s323713@...denti.polito.it, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [fs?] BUG: unable to handle kernel NULL pointer
 dereference in read_cache_folio

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

kernel clean failed: failed to run ["make" "-j" "0" "ARCH=arm64" "CROSS_COMPILE=aarch64-linux-gnu-" "distclean"]: exit status 2
make: the '-j' option requires a positive integer argument
Usage: make [options] [target] ...
Options:
  -b, -m                      Ignored for compatibility.
  -B, --always-make           Unconditionally make all targets.
  -C DIRECTORY, --directory=DIRECTORY
                              Change to DIRECTORY before doing anything.
  -d                          Print lots of debugging information.
  --debug[=FLAGS]             Print various types of debugging information.
  -e, --environment-overrides
                              Environment variables override makefiles.
  -E STRING, --eval=STRING    Evaluate STRING as a makefile statement.
  -f FILE, --file=FILE, --makefile=FILE
                              Read FILE as a makefile.
  -h, --help                  Print this message and exit.
  -i, --ignore-errors         Ignore errors from recipes.
  -I DIRECTORY, --include-dir=DIRECTORY
                              Search DIRECTORY for included makefiles.
  -j [N], --jobs[=N]          Allow N jobs at once; infinite jobs with no arg.
  -k, --keep-going            Keep going when some targets can't be made.
  -l [N], --load-average[=N], --max-load[=N]
                              Don't start multiple jobs unless load is below N.
  -L, --check-symlink-times   Use the latest mtime between symlinks and target.
  -n, --just-print, --dry-run, --recon
                              Don't actually run any recipe; just print them.
  -o FILE, --old-file=FILE, --assume-old=FILE
                              Consider FILE to be very old and don't remake it.
  -O[TYPE], --output-sync[=TYPE]
                              Synchronize output of parallel jobs by TYPE.
  -p, --print-data-base       Print make's internal database.
  -q, --question              Run no recipe; exit status says if up to date.
  -r, --no-builtin-rules      Disable the built-in implicit rules.
  -R, --no-builtin-variables  Disable the built-in variable settings.
  -s, --silent, --quiet       Don't echo recipes.
  --no-silent                 Echo recipes (disable --silent mode).
  -S, --no-keep-going, --stop
                              Turns off -k.
  -t, --touch                 Touch targets instead of remaking them.
  --trace                     Print tracing information.
  -v, --version               Print the version number of make and exit.
  -w, --print-directory       Print the current directory.
  --no-print-directory        Turn off -w, even if it was turned on implicitly.
  -W FILE, --what-if=FILE, --new-file=FILE, --assume-new=FILE
                              Consider FILE to be infinitely new.
  --warn-undefined-variables  Warn when an undefined variable is referenced.

This program built for x86_64-pc-linux-gnu
Report bugs to <bug-make@....org>



Tested on:

commit:         eca631b8 Merge tag 'f2fs-6.12-rc4' of git://git.kernel..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=ba9c4620d9519d1f
dashboard link: https://syzkaller.appspot.com/bug?extid=4089e577072948ac5531
compiler:       
userspace arch: arm64
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14078030580000