[syzbot] [btrfs?] WARNING in btrfs_split_ordered_extent

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: e2065b8c1b01 Merge tag '6.4-rc2-ksmbd-server-fixes' of git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11bfcf86280000
kernel config: https://syzkaller.appspot.com/x/.config?x=bda401fa9c6b4502
dashboard link: https://syzkaller.appspot.com/bug?extid=ee90502d5c8fd1d0dd93
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/738631cdfb7d/disk-e2065b8c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0b5c143f1c5e/vmlinux-e2065b8c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8fd7bb0bb108/bzImage-e2065b8c.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ee9050...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 25629 at fs/btrfs/ordered-data.c:1138 btrfs_split_ordered_extent+0x628/0x840
Modules linked in:
CPU: 1 PID: 25629 Comm: syz-executor.3 Not tainted 6.4.0-rc2-syzkaller-00338-ge2065b8c1b01 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
RIP: 0010:btrfs_split_ordered_extent+0x628/0x840 fs/btrfs/ordered-data.c:1138
Code: fe 48 c7 c7 20 92 2a 8b 48 c7 c6 a0 8d 2a 8b ba 6c 04 00 00 e8 a9 52 1d 07 e8 04 62 fb fd 0f 0b e9 21 fb ff ff e8 f8 61 fb fd <0f> 0b bb ea ff ff ff eb b0 e8 ea 61 fb fd 0f 0b bb ea ff ff ff eb
RSP: 0018:ffffc90005586dd8 EFLAGS: 00010246
RAX: ffffffff83901aa8 RBX: 0000000000010000 RCX: 0000000000040000
RDX: ffffc9000b999000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 1ffff1100ec235e1 R08: ffffffff83901672 R09: fffffbfff1cab8b6
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88807611af08 R14: 0000000000001000 R15: 00000000000a0000
FS: 00007f90dfaa6700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005621df2bfc70 CR3: 0000000020f04000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
btrfs_extract_ordered_extent+0x12c/0xb00 fs/btrfs/inode.c:2625
btrfs_dio_submit_io+0x239/0x340 fs/btrfs/inode.c:7737
iomap_dio_submit_bio fs/iomap/direct-io.c:75 [inline]
iomap_dio_bio_iter+0xe15/0x1430 fs/iomap/direct-io.c:355
__iomap_dio_rw+0x12c3/0x22e0 fs/iomap/direct-io.c:598
btrfs_dio_write+0xb6/0x100 fs/btrfs/inode.c:7770
btrfs_direct_write fs/btrfs/file.c:1529 [inline]
btrfs_do_write_iter+0x870/0x1270 fs/btrfs/file.c:1674
do_iter_write+0x7b1/0xcb0 fs/read_write.c:860
iter_file_splice_write+0x843/0xfe0 fs/splice.c:795
do_splice_from fs/splice.c:873 [inline]
direct_splice_actor+0xe7/0x1c0 fs/splice.c:1039
splice_direct_to_actor+0x4c4/0xbd0 fs/splice.c:994
do_splice_direct+0x283/0x3d0 fs/splice.c:1082
do_sendfile+0x620/0xff0 fs/read_write.c:1254
__do_sys_sendfile64 fs/read_write.c:1322 [inline]
__se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1308
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f90dec8c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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:00007f90dfaa6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f90dedac050 RCX: 00007f90dec8c169
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004
RBP: 00007f90dece7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 000080001d00c0d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc28d1208f R14: 00007f90dfaa6300 R15: 0000000000022000
</TASK>


---
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If the bug is already fixed, let syzbot know by replying with:
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#syz undup

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: a27648c74210 afs: Fix setting of mtime when creating a fil..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=12b04695280000
kernel config: https://syzkaller.appspot.com/x/.config?x=7474de833c217bf4

dashboard link: https://syzkaller.appspot.com/bug?extid=ee90502d5c8fd1d0dd93
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=120b88fd280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17e6a23b280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/33fadb6220e9/disk-a27648c7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/31a2f6248c1a/vmlinux-a27648c7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c97df5fe3d0b/bzImage-a27648c7.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/735d868a5353/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ee9050...@syzkaller.appspotmail.com

------------[ cut here ]------------

WARNING: CPU: 1 PID: 5017 at fs/btrfs/ordered-data.c:1138 btrfs_split_ordered_extent+0x628/0x840
Modules linked in:
CPU: 1 PID: 5017 Comm: syz-executor199 Not tainted 6.4.0-rc5-syzkaller-00017-ga27648c74210 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023

RIP: 0010:btrfs_split_ordered_extent+0x628/0x840 fs/btrfs/ordered-data.c:1138

Code: fe 48 c7 c7 a0 94 2a 8b 48 c7 c6 20 90 2a 8b ba 6c 04 00 00 e8 09 a9 1d 07 e8 f4 4a fb fd 0f 0b e9 21 fb ff ff e8 e8 4a fb fd <0f> 0b bb ea ff ff ff eb b0 e8 da 4a fb fd 0f 0b bb ea ff ff ff eb
RSP: 0018:ffffc90003cbedd8 EFLAGS: 00010293
RAX: ffffffff83903448 RBX: 0000000000010000 RCX: ffff88801929bb80
RDX: 0000000000000000 RSI: 0000000000010000 RDI: 0000000000001000
RBP: 1ffff1100fde111b R08: ffffffff83903012 R09: fffffbfff1cab9ae

R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000

R13: ffff88807ef088d8 R14: 0000000000001000 R15: 0000000000000000
FS: 00007f807fad4700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f9cf00c2723 CR3: 000000002b121000 CR4: 00000000003506e0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
btrfs_extract_ordered_extent+0x12c/0xb00 fs/btrfs/inode.c:2625
btrfs_dio_submit_io+0x239/0x340 fs/btrfs/inode.c:7737
iomap_dio_submit_bio fs/iomap/direct-io.c:75 [inline]
iomap_dio_bio_iter+0xe15/0x1430 fs/iomap/direct-io.c:355
__iomap_dio_rw+0x12c3/0x22e0 fs/iomap/direct-io.c:598
btrfs_dio_write+0xb6/0x100 fs/btrfs/inode.c:7770
btrfs_direct_write fs/btrfs/file.c:1529 [inline]
btrfs_do_write_iter+0x870/0x1270 fs/btrfs/file.c:1674
do_iter_write+0x7b1/0xcb0 fs/read_write.c:860
iter_file_splice_write+0x843/0xfe0 fs/splice.c:795
do_splice_from fs/splice.c:873 [inline]
direct_splice_actor+0xe7/0x1c0 fs/splice.c:1039
splice_direct_to_actor+0x4c4/0xbd0 fs/splice.c:994
do_splice_direct+0x283/0x3d0 fs/splice.c:1082
do_sendfile+0x620/0xff0 fs/read_write.c:1254
__do_sys_sendfile64 fs/read_write.c:1322 [inline]
__se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1308
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

RIP: 0033:0x7f8086f49329
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f807fad42f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f8086fd27b0 RCX: 00007f8086f49329
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 00007f8086f9f1f4 R08: 00007f807fad4700 R09: 0000000000000000
R10: 0000000008800000 R11: 0000000000000246 R12: 6f63617461646f6e
R13: 70735f6473736f6e R14: 0030656c69662f2e R15: 00007f8086fd27b8
</TASK>


---
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.

[Christoph Hellwig]

#syz test: git://git.infradead.org/users/hch/misc.git btrfs-dio-nocow-fix

[syzbot]

syzbot has bisected this issue to:

commit b73a6fd1b1efd799c6e3d14a922887f4453fea17
Author: Boris Burkov <bo...@bur.io>
Date: Tue Mar 28 05:19:57 2023 +0000

btrfs: split partial dio bios before submit

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13b24d59280000
start commit: a27648c74210 afs: Fix setting of mtime when creating a fil..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=10724d59280000
console output: https://syzkaller.appspot.com/x/log.txt?x=17b24d59280000

kernel config: https://syzkaller.appspot.com/x/.config?x=7474de833c217bf4
dashboard link: https://syzkaller.appspot.com/bug?extid=ee90502d5c8fd1d0dd93

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=120b88fd280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17e6a23b280000

Reported-by: syzbot+ee9050...@syzkaller.appspotmail.com
Fixes: b73a6fd1b1ef ("btrfs: split partial dio bios before submit")

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

[syzbot]

Hello,

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

Reported-and-tested-by: syzbot+ee9050...@syzkaller.appspotmail.com

Tested on:

commit: 8176a54b btrfs: fix iomap_begin length for nocow writes
git tree: git://git.infradead.org/users/hch/misc.git btrfs-dio-nocow-fix
console output: https://syzkaller.appspot.com/x/log.txt?x=11d17a43280000

kernel config: https://syzkaller.appspot.com/x/.config?x=7474de833c217bf4
dashboard link: https://syzkaller.appspot.com/bug?extid=ee90502d5c8fd1d0dd93

compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2

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