------------[ 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.0.0/5341
Modules linked in:
CPU: 0 UID: 0 PID: 5341 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 81 62 ff fe 31 c0 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 36 fc 6c fe 90 <0f> 0b 90 e9 0d fc ff ff e8 28 fc 6c fe 90 0f 0b 90 e9 5f fd ff ff
RSP: 0018:ffffc90004cd7808 EFLAGS: 00010287
RAX: ffffffff8358e4ba RBX: dffffc0000000000 RCX: 0000000000100000
RDX: ffffc90021003000 RSI: 000000000000d38c RDI: 000000000000d38d
RBP: 1ffff9200099af6d R08: ffff888000d0ca00 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000002 R12: 00000000000001d0
R13: 0000000000000000 R14: ffffc90004cd7b60 R15: ffffc90004cd7b68
FS:  00007fd8c6d126c0(0000) GS:ffff88808c809000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd8b9c3f000 CR3: 000000000e4ed000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 udf_setup_indirect_aext+0x60d/0x800 fs/udf/inode.c:2048
 udf_add_aext fs/udf/inode.c:2138 [inline]
 udf_do_extend_file+0x8a5/0x11e0 fs/udf/inode.c:590
 udf_extend_file fs/udf/inode.c:711 [inline]
 udf_setsize+0xbf3/0x10b0 fs/udf/inode.c:1298
 udf_setattr+0x3a1/0x5a0 fs/udf/file.c:245
 notify_change+0xc1a/0xf40 fs/attr.c:556
 do_truncate+0x1c2/0x250 fs/open.c:68
 do_ftruncate+0x490/0x540 fs/open.c:194
 ksys_ftruncate fs/open.c:206 [inline]
 __do_sys_ftruncate fs/open.c:211 [inline]
 __se_sys_ftruncate fs/open.c:209 [inline]
 __x64_sys_ftruncate+0x8f/0xe0 fs/open.c:209
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd8c5d9c819
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:00007fd8c6d11fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007fd8c6016090 RCX: 00007fd8c5d9c819
RDX: 0000000000000000 RSI: 0000008002007ffb RDI: 000000000000000a
RBP: 00007fd8c5e32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd8c6016128 R14: 00007fd8c6016090 R15: 00007ffff3852d68
 </TASK>