[syzbot] [btrfs?] WARNING in btrfs_run_delayed_refs (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: dad9774deaf1 Merge tag 'timers-urgent-2023-06-21' of git:/..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=16198bb7280000
kernel config: https://syzkaller.appspot.com/x/.config?x=e74b395fe4978721
dashboard link: https://syzkaller.appspot.com/bug?extid=810ea5febd3b79bdd384
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=11acf600a80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1474fa3f280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fce56e230cb4/disk-dad9774d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e12b4efd53ae/vmlinux-dad9774d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/38be193d7202/bzImage-dad9774d.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/2b9fc185d47b/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+810ea5...@syzkaller.appspotmail.com

BTRFS error (device loop0): failed to run delayed ref for logical 5251072 num_bytes 4096 type 176 action 1 ref_mod 1: -28
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: CPU: 0 PID: 4996 at fs/btrfs/extent-tree.c:2127 btrfs_run_delayed_refs+0x444/0x480 fs/btrfs/extent-tree.c:2127
Modules linked in:
CPU: 0 PID: 4996 Comm: syz-executor740 Not tainted 6.4.0-rc7-syzkaller-00072-gdad9774deaf1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:btrfs_run_delayed_refs+0x444/0x480 fs/btrfs/extent-tree.c:2127
Code: fe c1 38 c1 0f 8c 54 fc ff ff 48 89 ef e8 44 fe 60 fe e9 47 fc ff ff e8 9a 26 09 fe 48 c7 c7 00 95 29 8b 89 ee e8 4c a5 d0 fd <0f> 0b eb 9e f3 0f 1e fa e8 7f 26 09 fe 48 8b 44 24 18 42 80 3c 28
RSP: 0018:ffffc90003a6f070 EFLAGS: 00010246
RAX: b1a953d201add500 RBX: ffff88807d0f8001 RCX: ffff888027350000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 00000000ffffffe4 R08: ffffffff81530142 R09: fffff5200074ddc1
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888076ab7e70
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880146a1000
FS: 00007fa312072700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005645cf4d5000 CR3: 0000000077a2a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
btrfs_commit_transaction+0x427/0x3370 fs/btrfs/transaction.c:2158
btrfs_sync_file+0xcb3/0x10e0 fs/btrfs/file.c:2001
generic_write_sync include/linux/fs.h:2469 [inline]
btrfs_do_write_iter+0xccd/0x1270 fs/btrfs/file.c:1684
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: 0033:0x7fa3120ce3e9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 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:00007fa312072208 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fa312151788 RCX: 00007fa3120ce3e9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007fa312151780 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000880000c R11: 0000000000000246 R12: 00007fa31215178c
R13: 00007fffc2cae10f R14: 00007fa312072300 R15: 0000000000022000
</TASK>


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[syzbot]

syzbot has bisected this issue to:

commit f8f210dc84709804c9f952297f2bfafa6ea6b4bd
Author: Filipe Manana <fdma...@suse.com>
Date: Tue Mar 21 11:13:59 2023 +0000

btrfs: calculate the right space for delayed refs when updating global reserve

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12fb487fa80000
start commit: dad9774deaf1 Merge tag 'timers-urgent-2023-06-21' of git:/..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=11fb487fa80000
console output: https://syzkaller.appspot.com/x/log.txt?x=16fb487fa80000

kernel config: https://syzkaller.appspot.com/x/.config?x=e74b395fe4978721
dashboard link: https://syzkaller.appspot.com/bug?extid=810ea5febd3b79bdd384

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13ceaa3f280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1502f600a80000

Reported-by: syzbot+810ea5...@syzkaller.appspotmail.com
Fixes: f8f210dc8470 ("btrfs: calculate the right space for delayed refs when updating global reserve")

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