loop0: detected capacity change from 0 to 32768
BTRFS: device fsid c9fe44da-de57-406a-8241-57ec7d4412cf devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5318)
BTRFS info (device loop0): first mount of filesystem c9fe44da-de57-406a-8241-57ec7d4412cf
BTRFS info (device loop0): using crc32c checksum algorithm
BTRFS info (device loop0): enabling ssd optimizations
BTRFS info (device loop0): turning on async discard
BTRFS info (device loop0): enabling free space tree
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/block-group.c:4097 at do_chunk_alloc fs/btrfs/block-group.c:4097 [inline], CPU#0: syz.0.0/5318
WARNING: fs/btrfs/block-group.c:4097 at btrfs_chunk_alloc+0x101d/0x15e0 fs/btrfs/block-group.c:4338, CPU#0: syz.0.0/5318
Modules linked in:
CPU: 0 UID: 0 PID: 5318 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 04/01/2014
RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:4097 [inline]
RIP: 0010:btrfs_chunk_alloc+0x101f/0x15e0 fs/btrfs/block-group.c:4338
Code: 37 c1 b8 fd e9 6d 01 00 00 e8 dd cf 9d fd 84 c0 74 22 e8 24 c1 b8 fd e9 5a 01 00 00 e8 1a c1 b8 fd 48 8d 3d 03 05 0e 0c 89 de <67> 48 0f b9 3a e9 b3 fc ff ff e8 a2 94 91 07 41 89 c6 31 ff 89 c6
RSP: 0018:ffffc9000e2be600 EFLAGS: 00010287
RAX: ffffffff840bc346 RBX: ffffffffffffffe4 RCX: 0000000000100000
RDX: ffffc9000f43a000 RSI: 00000000ffffffe4 RDI: ffffffff9019c850
RBP: 0000000000000000 R08: ffff8880409ea480 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000002 R12: 1ffff1100237aa16
R13: ffff8880131583d8 R14: ffff888011d44001 R15: ffff88800bb42000
FS:  00007f1c4ca896c0(0000) GS:ffff88808cabf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c4ca25ff8 CR3: 0000000041b0a000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 find_free_extent_update_loop fs/btrfs/extent-tree.c:4306 [inline]
 find_free_extent+0x5179/0x5e20 fs/btrfs/extent-tree.c:4727
 btrfs_reserve_extent+0x344/0x830 fs/btrfs/extent-tree.c:4821
 cow_one_range fs/btrfs/inode.c:1321 [inline]
 cow_file_range+0x588/0x1310 fs/btrfs/inode.c:1523
 writepage_delalloc+0x1270/0x1ee0 fs/btrfs/extent_io.c:1516
 extent_writepage fs/btrfs/extent_io.c:1883 [inline]
 extent_write_cache_pages fs/btrfs/extent_io.c:2570 [inline]
 btrfs_writepages+0x14d3/0x23f0 fs/btrfs/extent_io.c:2703
 do_writepages+0x32e/0x550 mm/page-writeback.c:2598
 filemap_writeback mm/filemap.c:387 [inline]
 filemap_fdatawrite_range+0x1ef/0x2f0 mm/filemap.c:412
 btrfs_fdatawrite_range+0x54/0xf0 fs/btrfs/file.c:3891
 btrfs_direct_write+0x5e9/0xb70 fs/btrfs/direct-io.c:987
 btrfs_do_write_iter+0x39c/0x880 fs/btrfs/file.c:1458
 iter_file_splice_write+0x99b/0x1100 fs/splice.c:738
 do_splice_from fs/splice.c:938 [inline]
 direct_splice_actor+0x101/0x160 fs/splice.c:1161
 splice_direct_to_actor+0x53a/0xc70 fs/splice.c:1105
 do_splice_direct_actor fs/splice.c:1204 [inline]
 do_splice_direct+0x195/0x290 fs/splice.c:1230
 do_sendfile+0x535/0x7d0 fs/read_write.c:1372
 __do_sys_sendfile64 fs/read_write.c:1433 [inline]
 __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1419
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1c4bb9bf79
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1c4ca89028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f1c4be15fa0 RCX: 00007f1c4bb9bf79
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006
RBP: 00007f1c4bc327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1c4be16038 R14: 00007f1c4be15fa0 R15: 00007ffd67cddb78
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	b8 fd e9 6d 01       	mov    $0x16de9fd,%eax
   5:	00 00                	add    %al,(%rax)
   7:	e8 dd cf 9d fd       	call   0xfd9dcfe9
   c:	84 c0                	test   %al,%al
   e:	74 22                	je     0x32
  10:	e8 24 c1 b8 fd       	call   0xfdb8c139
  15:	e9 5a 01 00 00       	jmp    0x174
  1a:	e8 1a c1 b8 fd       	call   0xfdb8c139
  1f:	48 8d 3d 03 05 0e 0c 	lea    0xc0e0503(%rip),%rdi        # 0xc0e0529
  26:	89 de                	mov    %ebx,%esi
* 28:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2d:	e9 b3 fc ff ff       	jmp    0xfffffce5
  32:	e8 a2 94 91 07       	call   0x79194d9
  37:	41 89 c6             	mov    %eax,%r14d
  3a:	31 ff                	xor    %edi,%edi
  3c:	89 c6                	mov    %eax,%esi