------------[ cut here ]------------
within_last_ext && elen > ((loff_t)offset + 1) << inode->i_blkbits
WARNING: fs/udf/inode.c:683 at udf_extend_file fs/udf/inode.c:683 [inline], CPU#1: syz.0.16/6658
WARNING: fs/udf/inode.c:683 at udf_setsize+0xa5e/0x1120 fs/udf/inode.c:1300, CPU#1: syz.0.16/6658
Modules linked in:
CPU: 1 UID: 0 PID: 6658 Comm: syz.0.16 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:udf_extend_file fs/udf/inode.c:683 [inline]
RIP: 0010:udf_setsize+0xa5e/0x1120 fs/udf/inode.c:1300
Code: f6 6e fe 44 89 e1 44 8b a5 e0 fe ff ff 49 d3 e5 4c 89 ee 4c 89 e7 e8 21 f0 6e fe 4d 39 ec 0f 8e 5c fc ff ff e8 f3 f5 6e fe 90 <0f> 0b 90 e9 4e fc ff ff e8 e5 f5 6e fe 4c 8d a3 08 ff ff ff 4c 89
RSP: 0018:ffffc9000420fa98 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88805a7cd9b8 RCX: ffffffff83999c9f
RDX: ffff88807cc28000 RSI: ffffffff83999cad RDI: ffff88807cc28000
RBP: ffffc9000420fc40 R08: 0000000000000006 R09: 0000000000000400
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000400
R13: 0000000000000200 R14: 0000000000000001 R15: 0000000000000007
FS:  00007f6fd004b6c0(0000) GS:ffff888124448000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6fd004aff8 CR3: 000000004e750000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 udf_setattr+0x51d/0x6b0 fs/udf/file.c:238
 notify_change+0xb25/0x1330 fs/attr.c:556
 do_truncate+0x1df/0x240 fs/open.c:68
 do_ftruncate+0x59e/0x920 fs/open.c:196
 do_sys_ftruncate+0x61/0xb0 fs/open.c:208
 __do_sys_ftruncate fs/open.c:213 [inline]
 __se_sys_ftruncate fs/open.c:211 [inline]
 __x64_sys_ftruncate+0x58/0x80 fs/open.c:211
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6fcf1903a9
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:00007f6fd004b028 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007f6fcf396080 RCX: 00007f6fcf1903a9
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000004
RBP: 00007f6fcf21b8ec R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6fcf396080 R15: 00007ffeef719ad8
 </TASK>