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Subject[syzbot] [f2fs?] BUG: unable to handle kernel NULL pointer dereference in f2fs_release_folio
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Hello,

syzbot found the following issue on:

HEAD commit: a5541c0811a0 Merge branch 'for-next/core' 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=14e39af7880000
kernel config: https://syzkaller.appspot.com/x/.config?x=cbd4e584773e9397
dashboard link: https://syzkaller.appspot.com/bug?extid=00e671c059932a115ea4
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.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4b7702208fb9/disk-a5541c08.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9ec0153ec051/vmlinux-a5541c08.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6f8725ad290a/Image-a5541c08.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+00e671c059932a115ea4@syzkaller.appspotmail.com

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000f4f
Mem abort info:
ESR = 0x0000000096000006
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x06: level 2 translation fault
Data abort info:
ISV = 0, ISS = 0x00000006
CM = 0, WnR = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=0000000239c25000
[0000000000000f4f] pgd=0800000239ac9003, p4d=0800000239ac9003, pud=080000023986f003, pmd=0000000000000000
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 25727 Comm: syz-executor.0 Not tainted 6.1.0-rc8-syzkaller-33330-ga5541c0811a0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : f2fs_release_folio+0x74/0x180 fs/f2fs/data.c:3698
lr : generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline]
lr : folio_test_dirty include/linux/page-flags.h:479 [inline]
lr : f2fs_release_folio+0x5c/0x180 fs/f2fs/data.c:3694
sp : ffff8000213cb580
x29: ffff8000213cb580 x28: 0000000000000001 x27: dead000000000100
x26: fffffc0004e8ed48 x25: ffff0000ca783468 x24: ffff8000213cba78
x23: 0000000000000001 x22: ffffffffffffffff x21: ffff0000ca783240
x20: 0000000000000000 x19: fffffc0004e8ed40 x18: 00000000000000c0
x17: ffff80000dda8198 x16: 0000000000000000 x15: 0000000000000000
x14: 0000000000000002 x13: 0000000000000003 x12: 0000000000040000
x11: ff8080000931aeec x10: 0000000000000002 x9 : ffff0001f9be4ec0
x8 : ffff000139c2b000 x7 : ffff80000841b904 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000213cb5c0
x2 : ffff000116d8d000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
F2FS_SB fs/f2fs/f2fs.h:1995 [inline]
F2FS_I_SB fs/f2fs/f2fs.h:2000 [inline]
F2FS_M_SB fs/f2fs/f2fs.h:2005 [inline]
f2fs_release_folio+0x74/0x180 fs/f2fs/data.c:3697
filemap_release_folio+0xc0/0x238 mm/filemap.c:3948
shrink_folio_list+0xdbc/0x337c mm/vmscan.c:1982
shrink_inactive_list+0x30c/0x54c mm/vmscan.c:2489
shrink_list mm/vmscan.c:2728 [inline]
shrink_lruvec+0x218/0x5b4 mm/vmscan.c:5923
shrink_node_memcgs+0x13c/0x2c4 mm/vmscan.c:6110
shrink_node+0xb4/0x600 mm/vmscan.c:6141
shrink_zones+0x1bc/0x408 mm/vmscan.c:6379
do_try_to_free_pages+0xd0/0x42c mm/vmscan.c:6441
try_to_free_mem_cgroup_pages+0x174/0x244 mm/vmscan.c:6756
try_charge_memcg+0x1a8/0x650 mm/memcontrol.c:2681
try_charge mm/memcontrol.c:2823 [inline]
mem_cgroup_charge_skmem+0x50/0x150 mm/memcontrol.c:7209
sock_reserve_memory+0x88/0x144 net/core/sock.c:1018
sk_setsockopt+0xb54/0x1694 net/core/sock.c:1518
sock_setsockopt+0x48/0x60 net/core/sock.c:1542
__sys_setsockopt+0x21c/0x31c net/socket.c:2248
__do_sys_setsockopt net/socket.c:2263 [inline]
__se_sys_setsockopt net/socket.c:2260 [inline]
__arm64_sys_setsockopt+0x30/0x44 net/socket.c:2260
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197
el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584
Code: 2a1f03e0 f9400115 f94016a8 f9433d16 (b94f52d7)
---[ end trace 0000000000000000 ]---
pstore: crypto_comp_compress failed, ret = -22!
pstore: crypto_comp_compress failed, ret = -22!
pstore: crypto_comp_compress failed, ret = -22!
pstore: crypto_comp_compress failed, ret = -22!
pstore: crypto_comp_compress failed, ret = -22!
pstore: crypto_comp_compress failed, ret = -22!
----------------
Code disassembly (best guess):
0: 2a1f03e0 mov w0, wzr
4: f9400115 ldr x21, [x8]
8: f94016a8 ldr x8, [x21, #40]
c: f9433d16 ldr x22, [x8, #1656]
* 10: b94f52d7 ldr w23, [x22, #3920] <-- trapping instruction


---
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