Message-ID: <a13c50df-ebda-be79-c2c4-63d7018085ad@suse.com>
Date:   Wed, 25 Jan 2023 13:11:18 +0000
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Subject: Re: [syzbot] [btrfs?] kernel BUG in btrfs_csum_one_bio
Content-Language: en-US
To:     syzbot <syzbot+d8941552e21eac774778@syzkaller.appspotmail.com>,
        clm@fb.com, dsterba@suse.com, fdmanana@suse.com,
        josef@toxicpanda.com, linux-btrfs@vger.kernel.org,
        linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
References: <000000000000dca1ae05f3164d2f@google.com>
From:   Filipe Manana <fdmanana@suse.com>
In-Reply-To: <000000000000dca1ae05f3164d2f@google.com>
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On 25/01/23 13:06, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    f883675bf652 Merge tag 'gpio-fixes-for-v6.2-rc5' of git://..
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=114f4b71480000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d24faf5fc10540ae
> dashboard link: https://syzkaller.appspot.com/bug?extid=d8941552e21eac774778
> compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=157373de480000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=153fd539480000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/a81ede383e7d/disk-f883675b.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/510567d86f5c/vmlinux-f883675b.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/0fc2746533ba/bzImage-f883675b.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/40fdc0e77810/mount_0.gz
> 
> The issue was bisected to:
> 
> commit 2c8f5e8cdf0f77670b1a9f72156ad4e82ed323d1
> Author: Filipe Manana <fdmanana@suse.com>
> Date:   Fri Nov 11 11:50:27 2022 +0000
> 
>      btrfs: remove leftover setting of EXTENT_UPTODATE state in an inode's io_tree
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14c1e256480000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=16c1e256480000
> console output: https://syzkaller.appspot.com/x/log.txt?x=12c1e256480000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+d8941552e21eac774778@syzkaller.appspotmail.com
> Fixes: 2c8f5e8cdf0f ("btrfs: remove leftover setting of EXTENT_UPTODATE state in an inode's io_tree")
> 
> RSP: 002b:00007ffc233556b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
> RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f5e11d88ab9
> RDX: 000000000000fea7 RSI: 00000000200001c0 RDI: 0000000000000004
> RBP: 00007ffc233556e0 R08: 0000000000000002 R09: 00007ffc233556f0
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006
> R13: 00007ffc23355720 R14: 00007ffc23355700 R15: 000000000000000a
>   </TASK>
> ------------[ cut here ]------------
> kernel BUG at fs/btrfs/file-item.c:871!
> invalid opcode: 0000 [#1] PREEMPT SMP KASAN
> CPU: 0 PID: 5275 Comm: syz-executor267 Not tainted 6.2.0-rc4-syzkaller-00379-gf883675bf652 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
> RIP: 0010:btrfs_csum_one_bio+0x11bd/0x1210 fs/btrfs/file-item.c:871

That's due to a memory allocation failure, kvzalloc() returned NULL.
The bisection is not valid.

Thanks.

> Code: 8b 5c 24 20 e9 85 f2 ff ff e8 0f fa 02 fe 48 c7 c7 e0 88 84 8d 4c 89 f6 48 89 da e8 9d 83 f7 00 e9 4b f0 ff ff e8 f3 f9 02 fe <0f> 0b 44 89 f9 80 e1 07 38 c1 0f 8c 89 fd ff ff be 08 00 00 00 4c
> RSP: 0018:ffffc90004a2f120 EFLAGS: 00010293
> RAX: ffffffff8388e1fd RBX: 0000000000400140 RCX: ffff88801fd43a80
> RDX: 0000000000000000 RSI: 1ffff11003fa8755 RDI: ffff88801fd43aac
> RBP: ffffc90004a2f458 R08: ffffffff81c50a8e R09: 00000000ffffffff
> R10: fffffbfff1a83333 R11: 1ffffffff1a83332 R12: 1ffff1100fba540c
> R13: dffffc0000000000 R14: 000000000000005c R15: 000000000000f000
> FS:  0000555556645300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000055a1244ffb38 CR3: 0000000021b63000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   <TASK>
>   btrfs_submit_data_write_bio+0x339/0x4a0 fs/btrfs/inode.c:2755
>   submit_one_bio+0x353/0x490 fs/btrfs/extent_io.c:158
>   submit_write_bio fs/btrfs/extent_io.c:184 [inline]
>   extent_writepages+0x306/0x540 fs/btrfs/extent_io.c:3212
>   do_writepages+0x3c3/0x680 mm/page-writeback.c:2581
>   filemap_fdatawrite_wbc+0x11e/0x170 mm/filemap.c:388
>   __filemap_fdatawrite_range mm/filemap.c:421 [inline]
>   filemap_fdatawrite_range+0x175/0x200 mm/filemap.c:439
>   btrfs_fdatawrite_range fs/btrfs/file.c:3857 [inline]
>   start_ordered_ops fs/btrfs/file.c:1737 [inline]
>   btrfs_sync_file+0x383/0x1190 fs/btrfs/file.c:1813
>   generic_write_sync include/linux/fs.h:2885 [inline]
>   btrfs_do_write_iter+0xcd3/0x1280 fs/btrfs/file.c:1684
>   call_write_iter include/linux/fs.h:2189 [inline]
>   new_sync_write fs/read_write.c:491 [inline]
>   vfs_write+0x7dc/0xc50 fs/read_write.c:584
>   ksys_write+0x177/0x2a0 fs/read_write.c:637
>   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>   do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
>   entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f5e11d88ab9
> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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 c0 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffc233556b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
> RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f5e11d88ab9
> RDX: 000000000000fea7 RSI: 00000000200001c0 RDI: 0000000000000004
> RBP: 00007ffc233556e0 R08: 0000000000000002 R09: 00007ffc233556f0
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006
> R13: 00007ffc23355720 R14: 00007ffc23355700 R15: 000000000000000a
>   </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:btrfs_csum_one_bio+0x11bd/0x1210 fs/btrfs/file-item.c:871
> Code: 8b 5c 24 20 e9 85 f2 ff ff e8 0f fa 02 fe 48 c7 c7 e0 88 84 8d 4c 89 f6 48 89 da e8 9d 83 f7 00 e9 4b f0 ff ff e8 f3 f9 02 fe <0f> 0b 44 89 f9 80 e1 07 38 c1 0f 8c 89 fd ff ff be 08 00 00 00 4c
> RSP: 0018:ffffc90004a2f120 EFLAGS: 00010293
> RAX: ffffffff8388e1fd RBX: 0000000000400140 RCX: ffff88801fd43a80
> RDX: 0000000000000000 RSI: 1ffff11003fa8755 RDI: ffff88801fd43aac
> RBP: ffffc90004a2f458 R08: ffffffff81c50a8e R09: 00000000ffffffff
> R10: fffffbfff1a83333 R11: 1ffffffff1a83332 R12: 1ffff1100fba540c
> R13: dffffc0000000000 R14: 000000000000005c R15: 000000000000f000
> FS:  0000555556645300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000055cbc1e980c8 CR3: 0000000021b63000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> 
> 
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches