------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: CPU: 0 PID: 5386 at fs/btrfs/extent-tree.c:3237 __btrfs_free_extent+0x2cd5/0x4250 fs/btrfs/extent-tree.c:3237
Modules linked in:
CPU: 0 UID: 0 PID: 5386 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__btrfs_free_extent+0x2cd5/0x4250 fs/btrfs/extent-tree.c:3237
Code: 36 e2 fd 84 c0 74 58 e8 a9 93 fb fd e9 dd 02 00 00 e8 9f 93 fb fd 90 48 c7 c7 40 3a ed 8b 45 89 f7 44 89 f6 e8 ec 23 bf fd 90 <0f> 0b 90 90 e9 47 da ff ff e8 5d 48 b8 07 89 c3 31 ff 89 c6 e8 b2
RSP: 0018:ffffc9000d576be0 EFLAGS: 00010246
RAX: 01426d9322359100 RBX: 0000000000000000 RCX: 0000000000100000
RDX: ffffc9000f294000 RSI: 000000000001c43d RDI: 000000000001c43e
RBP: ffffc9000d576d90 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1c3a22c R12: 00000000ffffffe4
R13: 0000000000000345 R14: 00000000ffffffe4 R15: 00000000ffffffe4
FS:  00007fc33c59d6c0(0000) GS:ffff88808d007000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000004d6000 CR3: 0000000042d1c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 run_delayed_tree_ref fs/btrfs/extent-tree.c:1749 [inline]
 run_one_delayed_ref fs/btrfs/extent-tree.c:1775 [inline]
 btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:1972 [inline]
 __btrfs_run_delayed_refs+0xe7f/0x4130 fs/btrfs/extent-tree.c:2047
 btrfs_run_delayed_refs+0xe6/0x3b0 fs/btrfs/extent-tree.c:2159
 btrfs_commit_transaction+0x269/0x3950 fs/btrfs/transaction.c:2214
 btrfs_sync_file+0xd30/0x1160 fs/btrfs/file.c:1819
 generic_write_sync include/linux/fs.h:3043 [inline]
 btrfs_do_write_iter+0x59a/0x710 fs/btrfs/file.c:1470
 iter_file_splice_write+0x972/0x10e0 fs/splice.c:738
 do_splice_from fs/splice.c:938 [inline]
 direct_splice_actor+0xfe/0x160 fs/splice.c:1161
 splice_direct_to_actor+0x5a8/0xcc0 fs/splice.c:1105
 do_splice_direct_actor fs/splice.c:1204 [inline]
 do_splice_direct+0x181/0x270 fs/splice.c:1230
 do_sendfile+0x4da/0x7e0 fs/read_write.c:1370
 __do_sys_sendfile64 fs/read_write.c:1431 [inline]
 __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc33b78eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc33c59d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fc33b9e6180 RCX: 00007fc33b78eec9
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000007
RBP: 00007fc33b811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000040001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc33b9e6218 R14: 00007fc33b9e6180 R15: 00007fff55bb7fa8
 </TASK>