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Date:   Sun, 05 Nov 2023 17:31:27 -0800
Message-ID: <000000000000169326060971d07a@google.com>
Subject: [syzbot] [btrfs?] kernel BUG in __extent_writepage_io
From:   syzbot <syzbot+06006fc4a90bff8e8f17@syzkaller.appspotmail.com>
To:     clm@fb.com, dsterba@suse.com, josef@toxicpanda.com,
        linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
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Hello,

syzbot found the following issue on:

HEAD commit:    8bc9e6515183 Merge tag 'devicetree-for-6.7' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10e087a0e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c3aadb4391bbacce
dashboard link: https://syzkaller.appspot.com/bug?extid=06006fc4a90bff8e8f17
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6c9b9f6781b1/disk-8bc9e651.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/44acae63a945/vmlinux-8bc9e651.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f0058df8ab69/bzImage-8bc9e651.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+06006fc4a90bff8e8f17@syzkaller.appspotmail.com

assertion failed: block_start != EXTENT_MAP_HOLE, in fs/btrfs/extent_io.c:1351
------------[ cut here ]------------
kernel BUG at fs/btrfs/extent_io.c:1351!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 6580 Comm: syz-executor.3 Not tainted 6.6.0-syzkaller-06824-g8bc9e6515183 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:__extent_writepage_io+0xcce/0xcf0 fs/btrfs/extent_io.c:1351
Code: 18 83 70 07 0f 0b e8 a1 0c f2 fd 48 c7 c7 c0 b6 8b 8b 48 c7 c6 c0 c3 8b 8b 48 c7 c2 60 b6 8b 8b b9 47 05 00 00 e8 f2 82 70 07 <0f> 0b e8 7b 0c f2 fd 48 8b 3c 24 e8 82 2a 01 00 48 89 c7 48 c7 c6
RSP: 0018:ffffc90003eef3a0 EFLAGS: 00010246
RAX: 000000000000004e RBX: 0000000000000000 RCX: f5edcbbfef5d6800
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: fffffffffffffffd R08: ffffffff81717a4c R09: 1ffff920007dde14
R10: dffffc0000000000 R11: fffff520007dde15 R12: 0000000000002000
R13: 0000000000002000 R14: ffffea0000db97e8 R15: ffff88801ce9b4e0
FS:  00007f2d500396c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9b8a757f28 CR3: 0000000062c62000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __extent_writepage fs/btrfs/extent_io.c:1441 [inline]
 extent_write_cache_pages fs/btrfs/extent_io.c:2103 [inline]
 extent_writepages+0x149b/0x2e50 fs/btrfs/extent_io.c:2225
 do_writepages+0x3a6/0x670 mm/page-writeback.c:2553
 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:390
 __filemap_fdatawrite_range mm/filemap.c:423 [inline]
 __filemap_fdatawrite mm/filemap.c:429 [inline]
 filemap_flush+0x11e/0x170 mm/filemap.c:456
 btrfs_release_file+0x117/0x130 fs/btrfs/file.c:1726
 __fput+0x3cc/0xa10 fs/file_table.c:394
 task_work_run+0x24a/0x300 kernel/task_work.c:180
 get_signal+0x166e/0x1840 kernel/signal.c:2691
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296
 do_syscall_64+0x50/0x110 arch/x86/entry/common.c:88
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f2d4f27cae9
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:00007f2d500390c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: fffffffffffffffc RBX: 00007f2d4f39c120 RCX: 00007f2d4f27cae9
RDX: 0000000000000000 RSI: 000000000014927e RDI: 0000000020000180
RBP: 00007f2d4f2c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f2d4f39c120 R15: 00007ffcbb50d888
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__extent_writepage_io+0xcce/0xcf0 fs/btrfs/extent_io.c:1351
Code: 18 83 70 07 0f 0b e8 a1 0c f2 fd 48 c7 c7 c0 b6 8b 8b 48 c7 c6 c0 c3 8b 8b 48 c7 c2 60 b6 8b 8b b9 47 05 00 00 e8 f2 82 70 07 <0f> 0b e8 7b 0c f2 fd 48 8b 3c 24 e8 82 2a 01 00 48 89 c7 48 c7 c6
RSP: 0018:ffffc90003eef3a0 EFLAGS: 00010246
RAX: 000000000000004e RBX: 0000000000000000 RCX: f5edcbbfef5d6800
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: fffffffffffffffd R08: ffffffff81717a4c R09: 1ffff920007dde14
R10: dffffc0000000000 R11: fffff520007dde15 R12: 0000000000002000
R13: 0000000000002000 R14: ffffea0000db97e8 R15: ffff88801ce9b4e0
FS:  00007f2d500396c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30c22000 CR3: 0000000062c62000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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