[syzbot] BUG: unable to handle kernel NULL pointer dereference in set_page_dirty

syzbot
2022-08-25T15:31:11Z

Hello,

syzbot found the following issue on:

HEAD commit: a41a877bc12d Merge branch 'for-next/fixes' into for-kernelci
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=175def47080000
kernel config: https://syzkaller.appspot.com/x/.config?x=5cea15779c42821c
dashboard link: https://syzkaller.appspot.com/bug?extid=775a3440817f74fddb8c
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+775a3440817f74fddb8c@syzkaller.appspotmail.com

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
Mem abort info:
ESR = 0x0000000086000005
EC = 0x21: IABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x05: level 1 translation fault
user pgtable: 4k pages, 48-bit VAs, pgdp=00000001249cc000
[0000000000000000] pgd=080000012ee65003, p4d=080000012ee65003, pud=0000000000000000
Internal error: Oops: 86000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 3044 Comm: syz-executor.0 Not tainted 6.0.0-rc2-syzkaller-16455-ga41a877bc12d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/20/2022
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : 0x0
lr : folio_mark_dirty+0xbc/0x208 mm/page-writeback.c:2748
sp : ffff800012803830
x29: ffff800012803830 x28: ffff0000d02c8000 x27: 0000000000000009
x26: 0000000000000001 x25: 0000000000000a00 x24: 0000000000000080
x23: 0000000000000000 x22: ffff0000ef276c00 x21: 05ffc00000000007
x20: ffff0000f14b83b8 x19: fffffc00036409c0 x18: fffffffffffffff5
x17: ffff80000dd7a698 x16: ffff80000dbb8658 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
x11: ff808000083e9814 x10: 0000000000000000 x9 : ffff8000083e9814
x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffff0000d9028000 x4 : ffff0000d5c31000 x3 : ffff0000d9027f80
x2 : fffffffffffffff0 x1 : fffffc00036409c0 x0 : ffff0000f14b83b8
Call trace:
0x0
set_page_dirty+0x38/0xbc mm/folio-compat.c:62
get_next_nat_page+0x198/0x300 fs/f2fs/node.c:154
__flush_nat_entry_set fs/f2fs/node.c:3005 [inline]
f2fs_flush_nat_entries+0x354/0x988 fs/f2fs/node.c:3109
f2fs_write_checkpoint+0x350/0x568 fs/f2fs/checkpoint.c:1667
f2fs_issue_checkpoint+0x1b0/0x234
f2fs_sync_fs+0x8c/0xc8 fs/f2fs/super.c:1651
sync_filesystem+0xe0/0x134 fs/sync.c:66
generic_shutdown_super+0x38/0x190 fs/super.c:474
kill_block_super+0x30/0x78 fs/super.c:1427
kill_f2fs_super+0x140/0x184 fs/f2fs/super.c:4544
deactivate_locked_super+0x70/0xd4 fs/super.c:332
deactivate_super+0xb8/0xbc fs/super.c:363
cleanup_mnt+0x1f8/0x234 fs/namespace.c:1186
__cleanup_mnt+0x20/0x30 fs/namespace.c:1193
task_work_run+0xc4/0x208 kernel/task_work.c:177
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
do_notify_resume+0x174/0x1d0 arch/arm64/kernel/signal.c:1127
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:625
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642
el0t_64_sync+0x18c/0x190
Code: bad PC value
---[ end trace 0000000000000000 ]---

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