loop0: detected capacity change from 0 to 512
UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5357 at fs/udf/truncate.c:224 udf_truncate_extents+0xd4c/0xec0 fs/udf/truncate.c:224
Modules linked in:
CPU: 0 UID: 0 PID: 5357 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_truncate_extents+0xd4c/0xec0 fs/udf/truncate.c:224
Code: 87 66 0f 48 3b 84 24 80 01 00 00 75 77 44 89 e0 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 db f2 43 08 cc e8 f5 32 85 fe 90 <0f> 0b 90 eb 88 44 89 e9 80 e1 07 38 c1 0f 8c e4 f3 ff ff 4c 89 ef
RSP: 0018:ffffc9000d35f700 EFLAGS: 00010287
RAX: ffffffff833a884b RBX: 1ffff110089350d4 RCX: 0000000000100000
RDX: ffffc9000e06a000 RSI: 00000000000007f9 RDI: 00000000000007fa
RBP: ffffc9000d35f8d8 R08: ffff888000bbc880 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000000
R13: 0000000000000000 R14: 000000000000000a R15: 000000000000000a
FS:  00007f1ceadff6c0(0000) GS:ffff88808d20f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1cdedff000 CR3: 0000000043493000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 udf_write_failed+0x185/0x1c0 fs/udf/inode.c:178
 udf_write_begin+0x212/0x270 fs/udf/inode.c:265
 generic_perform_write+0x2c5/0x900 mm/filemap.c:4175
 udf_file_write_iter+0x2d5/0x6c0 fs/udf/file.c:111
 do_iter_readv_writev+0x619/0x8b0 fs/read_write.c:-1
 vfs_writev+0x31a/0x960 fs/read_write.c:1057
 do_pwritev fs/read_write.c:1153 [inline]
 __do_sys_pwritev2 fs/read_write.c:1211 [inline]
 __se_sys_pwritev2+0x179/0x290 fs/read_write.c:1202
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1ce9f8ebe9
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:00007f1ceadff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007f1cea1b5fa0 RCX: 00007f1ce9f8ebe9
RDX: 0000000000000001 RSI: 00002000000001c0 RDI: 0000000000000005
RBP: 00007f1cea011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000e7b R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1cea1b6038 R14: 00007f1cea1b5fa0 R15: 00007fff86723548
 </TASK>