[syzbot] [f2fs?] kernel BUG in clear_inode (4)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: f777d1112ee5 Merge tag 'vfs-6.17-rc6.fixes' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=124dad62580000
kernel config: https://syzkaller.appspot.com/x/.config?x=429771c55b615e85
dashboard link: https://syzkaller.appspot.com/bug?extid=90266696fe5daacebd35
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15a43562580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=164dad62580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/860ff2f591a4/disk-f777d111.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/31f4ca3a76d4/vmlinux-f777d111.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c534fac91a74/bzImage-f777d111.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/6c7a25c90276/mount_0.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=11a43562580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+902666...@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 40427
F2FS-fs (loop0): Wrong SSA boundary, start(3584) end(4096) blocks(3072)
F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop0): invalid crc value
F2FS-fs (loop0): f2fs_convert_inline_folio: corrupted inline inode ino=3, i_addr[0]:0x1601, run fsck to fix.
------------[ cut here ]------------
kernel BUG at fs/inode.c:753!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 6097 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:clear_inode+0x169/0x190 fs/inode.c:753
Code: 4c 89 f7 e8 59 7a ec ff e9 60 ff ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 7c c0 4c 89 f7 e8 2f 7b ec ff eb b6 e8 28 40 8d ff 90 <0f> 0b e8 20 40 8d ff 90 0f 0b e8 18 40 8d ff 90 0f 0b e8 10 40 8d
RSP: 0018:ffffc9000408f890 EFLAGS: 00010293
RAX: ffffffff82311f78 RBX: ffff888022059300 RCX: ffff888024ced940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000408fa00 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1e3ab47 R12: dffffc0000000000
R13: ffff888022059300 R14: ffff888022059558 R15: 0000000000000001
FS: 000055557dd70500(0000) GS:ffff8881268bf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055738e9e8660 CR3: 0000000029a1c000 CR4: 00000000003526f0
Call Trace:
<TASK>
evict+0x504/0x9c0 fs/inode.c:810
f2fs_fill_super+0x5612/0x6fa0 fs/f2fs/super.c:5047
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692
vfs_get_tree+0x8f/0x2b0 fs/super.c:1815
do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808
do_mount fs/namespace.c:4136 [inline]
__do_sys_mount fs/namespace.c:4347 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4324
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f865d77038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc62ec72e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc62ec7370 RCX: 00007f865d77038a
RDX: 0000200000000140 RSI: 00002000000000c0 RDI: 00007ffc62ec7330
RBP: 0000200000000140 R08: 00007ffc62ec7370 R09: 0000000000000008
R10: 0000000000000008 R11: 0000000000000246 R12: 00002000000000c0
R13: 00007ffc62ec7330 R14: 0000000000005531 R15: 00002000000056c0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:clear_inode+0x169/0x190 fs/inode.c:753
Code: 4c 89 f7 e8 59 7a ec ff e9 60 ff ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 7c c0 4c 89 f7 e8 2f 7b ec ff eb b6 e8 28 40 8d ff 90 <0f> 0b e8 20 40 8d ff 90 0f 0b e8 18 40 8d ff 90 0f 0b e8 10 40 8d
RSP: 0018:ffffc9000408f890 EFLAGS: 00010293
RAX: ffffffff82311f78 RBX: ffff888022059300 RCX: ffff888024ced940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000408fa00 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1e3ab47 R12: dffffc0000000000
R13: ffff888022059300 R14: ffff888022059558 R15: 0000000000000001
FS: 000055557dd70500(0000) GS:ffff8881268bf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055738e9e8660 CR3: 0000000029a1c000 CR4: 00000000003526f0


---
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[syzbot]

syzbot has bisected this issue to:

commit c240c87bcd44a1a2375fc8ef8c645d1f1fe76466
Author: Chao Yu <ch...@kernel.org>
Date: Tue May 21 06:23:18 2024 +0000

f2fs: fix to do sanity check on blocks for inline_data inode

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17754b12580000
start commit: f777d1112ee5 Merge tag 'vfs-6.17-rc6.fixes' of git://git.k..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=14f54b12580000
console output: https://syzkaller.appspot.com/x/log.txt?x=10f54b12580000

kernel config: https://syzkaller.appspot.com/x/.config?x=429771c55b615e85
dashboard link: https://syzkaller.appspot.com/bug?extid=90266696fe5daacebd35

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15a43562580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=164dad62580000

Reported-by: syzbot+902666...@syzkaller.appspotmail.com
Fixes: c240c87bcd44 ("f2fs: fix to do sanity check on blocks for inline_data inode")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[Chao Yu]

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git bugfix/syzbot

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+902666...@syzkaller.appspotmail.com
Tested-by: syzbot+902666...@syzkaller.appspotmail.com

Tested on:

commit: 29c29fdc f2fs: fix to truncate first page in error pat..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git bugfix/syzbot
console output: https://syzkaller.appspot.com/x/log.txt?x=16da7562580000
kernel config: https://syzkaller.appspot.com/x/.config?x=edacbd86461ffabe

dashboard link: https://syzkaller.appspot.com/bug?extid=90266696fe5daacebd35
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.