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Date: Sat, 01 Jun 2024 20:46:04 -0700
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Subject: Re: [syzbot] [f2fs?] kernel BUG in f2fs_write_inline_data
From: syzbot <syzbot+848062ba19c8782ca5c8@syzkaller.appspotmail.com>
To: chao@kernel.org, jaegeuk@kernel.org, 
	linux-f2fs-devel@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, 
	linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Content-Type: text/plain; charset="UTF-8"

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in f2fs_write_inline_data

loop0: detected capacity change from 0 to 40427
F2FS-fs (loop0): Invalid log_blocksize (268), supports only 12
F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop0): Found nat_bits in checkpoint
F2FS-fs (loop0): Try to recover 1th superblock, ret: 0
F2FS-fs (loop0): Mounted with checkpoint version = 48b305e5
------------[ cut here ]------------
kernel BUG at fs/f2fs/inline.c:276!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 PID: 5967 Comm: syz-executor Not tainted 6.9.0-syzkaller-10227-g9ee8c306dc6b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:f2fs_write_inline_data+0x781/0x790 fs/f2fs/inline.c:276
Code: ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c e3 fc ff ff 48 89 df e8 cf da 09 fe e9 d6 fc ff ff e8 75 68 96 07 e8 30 03 a4 fd 90 <0f> 0b e8 28 03 a4 fd 90 0f 0b 0f 1f 44 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc9000352eb20 EFLAGS: 00010293
RAX: ffffffff83f22ec0 RBX: 0000000000000001 RCX: ffff888024a21e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000352ec50 R08: ffffffff83f22985 R09: 1ffff1100d23c095
R10: dffffc0000000000 R11: ffffed100d23c096 R12: ffffc9000352eba8
R13: 1ffff1100d23c095 R14: ffffc9000352eba0 R15: ffffc9000352ebb0
FS:  00007efdd7bfa6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020002000 CR3: 000000007ac94000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 f2fs_write_single_data_page+0xbb6/0x1e90 fs/f2fs/data.c:2888
 f2fs_write_cache_pages fs/f2fs/data.c:3187 [inline]
 __f2fs_write_data_pages fs/f2fs/data.c:3342 [inline]
 f2fs_write_data_pages+0x1efe/0x3a90 fs/f2fs/data.c:3369
 do_writepages+0x359/0x870 mm/page-writeback.c:2634
 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397
 __filemap_fdatawrite_range mm/filemap.c:430 [inline]
 file_write_and_wait_range+0x1aa/0x290 mm/filemap.c:788
 f2fs_do_sync_file+0x68a/0x1ae0 fs/f2fs/file.c:276
 generic_write_sync include/linux/fs.h:2806 [inline]
 f2fs_file_write_iter+0x7bd/0x24e0 fs/f2fs/file.c:4977
 call_write_iter include/linux/fs.h:2114 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa72/0xc90 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efdd6e7cee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efdd7bfa0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007efdd6fb3fa0 RCX: 00007efdd6e7cee9
RDX: 0000000000002000 RSI: 0000000020000040 RDI: 0000000000000006
RBP: 00007efdd6ec947f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007efdd6fb3fa0 R15: 00007ffd0e21ca28
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:f2fs_write_inline_data+0x781/0x790 fs/f2fs/inline.c:276
Code: ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c e3 fc ff ff 48 89 df e8 cf da 09 fe e9 d6 fc ff ff e8 75 68 96 07 e8 30 03 a4 fd 90 <0f> 0b e8 28 03 a4 fd 90 0f 0b 0f 1f 44 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc9000352eb20 EFLAGS: 00010293
RAX: ffffffff83f22ec0 RBX: 0000000000000001 RCX: ffff888024a21e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000352ec50 R08: ffffffff83f22985 R09: 1ffff1100d23c095
R10: dffffc0000000000 R11: ffffed100d23c096 R12: ffffc9000352eba8
R13: 1ffff1100d23c095 R14: ffffc9000352eba0 R15: ffffc9000352ebb0
FS:  00007efdd7bfa6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020002000 CR3: 000000007ac94000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


Tested on:

commit:         9ee8c306 f2fs: fix to truncate preallocated blocks in ..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git wip
console output: https://syzkaller.appspot.com/x/log.txt?x=12ab0a4a980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=48a63c58ee55467e
dashboard link: https://syzkaller.appspot.com/bug?extid=848062ba19c8782ca5c8
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.