------------[ cut here ]------------
le32_to_cpu(aed->lengthAllocDescs) != epos->offset - sizeof(struct allocExtDesc)
WARNING: fs/udf/inode.c:2086 at __udf_add_aext+0x52b/0x6e0 fs/udf/inode.c:2085, CPU#0: syz.0.0/5343
Modules linked in:
CPU: 0 UID: 0 PID: 5343 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:__udf_add_aext+0x52b/0x6e0 fs/udf/inode.c:2085
Code: 81 c4 48 ff ff ff 4c 89 e6 e8 71 b8 fe fe 31 c0 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d e9 8c c2 52 08 cc e8 c6 3e 6c fe 90 <0f> 0b 90 e9 0d fc ff ff e8 b8 3e 6c fe 90 0f 0b 90 e9 5f fd ff ff
RSP: 0018:ffffc9000f747220 EFLAGS: 00010287
RAX: ffffffff8359875a RBX: dffffc0000000000 RCX: 0000000000100000
RDX: ffffc90020802000 RSI: 0000000000019621 RDI: 0000000000019622
RBP: 1ffff92001ee8e7f R08: ffff88803f5ca540 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000000
R13: 0000000000000001 R14: ffffc9000f7473f0 R15: ffffc9000f7473f8
FS:  00007f0be96016c0(0000) GS:ffff88808c891000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f575586cf10 CR3: 0000000013390000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 udf_add_aext fs/udf/inode.c:2143 [inline]
 udf_insert_aext fs/udf/inode.c:2325 [inline]
 udf_update_extents fs/udf/inode.c:1210 [inline]
 inode_getblk fs/udf/inode.c:924 [inline]
 udf_map_block+0x33d9/0x42d0 fs/udf/inode.c:453
 __udf_get_block+0x52/0x250 fs/udf/inode.c:467
 __block_write_begin_int+0x6c6/0x1910 fs/buffer.c:2042
 block_write_begin+0x8d/0x120 fs/buffer.c:2153
 udf_write_begin+0x118/0x270 fs/udf/inode.c:261
 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4325
 udf_file_write_iter+0x2ca/0x6b0 fs/udf/file.c:112
 aio_write+0x5cd/0x870 fs/aio.c:1688
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x7bb/0x14c0 fs/aio.c:2107
 __do_sys_io_submit fs/aio.c:2166 [inline]
 __se_sys_io_submit+0x195/0x340 fs/aio.c:2136
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0be879ce59
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:00007f0be9600fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007f0be8a16180 RCX: 00007f0be879ce59
RDX: 0000200000000540 RSI: 0000000000000001 RDI: 00007f0be9602000
RBP: 00007f0be8832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0be8a16218 R14: 00007f0be8a16180 R15: 00007fff975a7598
 </TASK>