Re: [syzbot] [f2fs?] kernel BUG in f2fs_write_inline_data

[Chao Yu]

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

On 2024/6/1 19:50, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit:    0e1980c40b6e Add linux-next specific files for 20240531
> git tree:       linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=146c33d6980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d9c3ca4e54577b88
> dashboard link: https://syzkaller.appspot.com/bug?extid=848062ba19c8782ca5c8
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14a9aabc980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14d86426980000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/44fb1d8b5978/disk-0e1980c4.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/a66ce5caf0b2/vmlinux-0e1980c4.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/8992fc8fe046/bzImage-0e1980c4.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/72a0fa392581/mount_0.gz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+848062ba19c8782ca5c8@xxxxxxxxxxxxxxxxxxxxxxxxx
>
> 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:258!
> Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
> CPU: 1 PID: 5090 Comm: syz-executor430 Not tainted 6.10.0-rc1-next-20240531-syzkaller #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:258
> Code: ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c e3 fc ff ff 48 89 df e8 ff a4 09 fe e9 d6 fc ff ff e8 25 22 9a 07 e8 a0 b7 a3 fd 90 <0f> 0b e8 98 b7 a3 fd 90 0f 0b 0f 1f 44 00 00 90 90 90 90 90 90 90
> RSP: 0018:ffffc9000343eb00 EFLAGS: 00010293
> RAX: ffffffff83f2c450 RBX: 0000000000000001 RCX: ffff88807f750000
> RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
> RBP: ffffc9000343ec30 R08: ffffffff83f2bf15 R09: 1ffff1100f0ed1ad
> R10: dffffc0000000000 R11: ffffed100f0ed1ae R12: ffffc9000343eb88
> R13: 1ffff1100f0ed1ad R14: ffffc9000343eb80 R15: ffffc9000343eb90
> FS:  000055557674e380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020002000 CR3: 000000001fb2e000 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:2858
>   f2fs_write_cache_pages fs/f2fs/data.c:3157 [inline]
>   __f2fs_write_data_pages fs/f2fs/data.c:3312 [inline]
>   f2fs_write_data_pages+0x1efe/0x3a90 fs/f2fs/data.c:3339
>   do_writepages+0x35d/0x870 mm/page-writeback.c:2657
>   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/0x1b10 fs/f2fs/file.c:276
>   generic_write_sync include/linux/fs.h:2810 [inline]
>   f2fs_file_write_iter+0x7bd/0x24e0 fs/f2fs/file.c:4935
>   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+0xf3/0x230 arch/x86/entry/common.c:83
>   entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7fd453a5f779
> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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 b8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffc94e03488 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
> RAX: ffffffffffffffda RBX: 00007ffc94e03658 RCX: 00007fd453a5f779
> RDX: 0000000000002000 RSI: 0000000020000040 RDI: 0000000000000006
> RBP: 00007fd453ad8610 R08: 00007ffc94e03658 R09: 00007ffc94e03658
> R10: 00007ffc94e03658 R11: 0000000000000246 R12: 0000000000000001
> R13: 00007ffc94e03648 R14: 0000000000000001 R15: 0000000000000001
>   </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:f2fs_write_inline_data+0x781/0x790 fs/f2fs/inline.c:258
> Code: ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c e3 fc ff ff 48 89 df e8 ff a4 09 fe e9 d6 fc ff ff e8 25 22 9a 07 e8 a0 b7 a3 fd 90 <0f> 0b e8 98 b7 a3 fd 90 0f 0b 0f 1f 44 00 00 90 90 90 90 90 90 90
> RSP: 0018:ffffc9000343eb00 EFLAGS: 00010293
> RAX: ffffffff83f2c450 RBX: 0000000000000001 RCX: ffff88807f750000
> RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
> RBP: ffffc9000343ec30 R08: ffffffff83f2bf15 R09: 1ffff1100f0ed1ad
> R10: dffffc0000000000 R11: ffffed100f0ed1ae R12: ffffc9000343eb88
> R13: 1ffff1100f0ed1ad R14: ffffc9000343eb80 R15: ffffc9000343eb90
> FS:  000055557674e380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000056082271e438 CR3: 000000001fb2e000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>
>
> ---
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.