syzbot

loop0: detected capacity change from 0 to 2048
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
loop0: detected capacity change from 2048 to 64
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4245 at fs/udf/inode.c:1928 __udf_add_aext+0x564/0x6f0
Modules linked in:
CPU: 1 PID: 4245 Comm: syz-executor184 Not tainted 6.1.131-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__udf_add_aext+0x564/0x6f0 fs/udf/inode.c:1927
Code: c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 c4 da 81 fe 0f 0b e9 ed fb ff ff e8 b8 da 81 fe 0f 0b e9 5c fc ff ff e8 ac da 81 fe <0f> 0b e9 4f fd ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c d1 fa
RSP: 0018:ffffc90003d273f8 EFLAGS: 00010293
RAX: ffffffff8308cf14 RBX: 0000000000000150 RCX: ffff8880197e0000
RDX: 0000000000000000 RSI: 0000000000000150 RDI: ffffffffffffff68
RBP: 00000000bffffe00 R08: ffffffff8308cc5c R09: ffffffff8308ca12
R10: 0000000000000002 R11: ffff8880197e0000 R12: ffffc90003d27620
R13: ffffffffffffff68 R14: dffffc0000000000 R15: 0000000000000010
FS:  0000555587a3d380(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562884783b28 CR3: 0000000020b80000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 udf_add_aext fs/udf/inode.c:1989 [inline]
 udf_insert_aext fs/udf/inode.c:2160 [inline]
 udf_update_extents fs/udf/inode.c:1060 [inline]
 inode_getblk fs/udf/inode.c:776 [inline]
 udf_get_block+0x3cc7/0x5370 fs/udf/inode.c:359
 __block_write_begin_int+0x544/0x1a30 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin+0x98/0x1f0 fs/buffer.c:2102
 udf_write_begin+0x2d/0x60 fs/udf/inode.c:212
 generic_perform_write+0x2fc/0x5e0 mm/filemap.c:3845
 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3973
 udf_file_write_iter+0x291/0x670 fs/udf/file.c:164
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x857/0xbc0 fs/read_write.c:584
 ksys_write+0x19c/0x2c0 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa4e695a939
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffa5d5dd18 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fffa5d5dee8 RCX: 00007fa4e695a939
RDX: 0000000000000050 RSI: 0000400000000140 RDI: 0000000000000004
RBP: 00007fa4e69ce610 R08: 00007fffa5d5dee8 R09: 00007fffa5d5dee8
R10: 00007fffa5d5dee8 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffa5d5ded8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>