------------[ cut here ]------------
WARNING: fs/udf/inode.c:684 at udf_extend_file fs/udf/inode.c:683 [inline], CPU#0: syz.0.0/5335
WARNING: fs/udf/inode.c:684 at udf_setsize+0xd4e/0x1000 fs/udf/inode.c:1300, CPU#0: syz.0.0/5335
Modules linked in:
CPU: 0 UID: 0 PID: 5335 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:udf_extend_file fs/udf/inode.c:683 [inline]
RIP: 0010:udf_setsize+0xd4e/0x1000 fs/udf/inode.c:1300
Code: 44 89 e0 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 20 14 80 fe 45 89 f4 e9 49 fe ff ff e8 13 14 80 fe 90 <0f> 0b 90 e9 00 f8 ff ff 44 89 e9 80 e1 07 38 c1 0f 8c 49 f3 ff ff
RSP: 0018:ffffc90009a9faa0 EFLAGS: 00010293
RAX: ffffffff8340f13d RBX: ffff8880230047a8 RCX: ffff888039f88000
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000000000200
RBP: ffffc90009a9fbe0 R08: ffff88802300476b R09: 1ffff110046008ed
R10: dffffc0000000000 R11: ffffed10046008ee R12: 0000000000000001
R13: 0000000000000007 R14: 0000000000000200 R15: 0000000000001000
FS:  00007f1af75456c0(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000040 CR3: 0000000043cdd000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 udf_setattr+0x3a1/0x5a0 fs/udf/file.c:236
 notify_change+0xc1a/0xf40 fs/attr.c:546
 do_truncate+0x1a4/0x220 fs/open.c:68
 do_ftruncate+0x4a5/0x560 fs/open.c:195
 do_sys_ftruncate fs/open.c:207 [inline]
 __do_sys_ftruncate fs/open.c:212 [inline]
 __se_sys_ftruncate fs/open.c:210 [inline]
 __x64_sys_ftruncate+0x92/0xf0 fs/open.c:210
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1af678f7c9
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:00007f1af7545038 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007f1af69e6090 RCX: 00007f1af678f7c9
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000004
RBP: 00007f1af6813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1af69e6128 R14: 00007f1af69e6090 R15: 00007ffea7bf47e8
 </TASK>