================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_xtree.c:622:15
index 19 is out of range for type 'xad_t [18]'
CPU: 1 PID: 9595 Comm: syz-executor.4 Not tainted 6.6.0-rc1-next-20230915-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:217 [inline]
 __ubsan_handle_out_of_bounds+0x111/0x150 lib/ubsan.c:348
 xtInsert+0xe82/0xef0 fs/jfs/jfs_xtree.c:622
 extAlloc+0x834/0xf00 fs/jfs/jfs_extent.c:145
 jfs_get_block+0x428/0xb20 fs/jfs/inode.c:248
 __block_write_begin_int+0x3c0/0x14d0 fs/buffer.c:2118
 __block_write_begin fs/buffer.c:2167 [inline]
 block_write_begin+0xb1/0x490 fs/buffer.c:2226
 jfs_write_begin+0x31/0xd0 fs/jfs/inode.c:299
 generic_perform_write+0x278/0x600 mm/filemap.c:3955
 __generic_file_write_iter+0x1f9/0x240 mm/filemap.c:4050
 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4076
 call_write_iter include/linux/fs.h:1986 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x650/0xe40 fs/read_write.c:584
 ksys_write+0x12f/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8dfd27cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8dfe0920c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8dfd39c050 RCX: 00007f8dfd27cae9
RDX: 000000003af4701e RSI: 0000000020000240 RDI: 0000000000000007
RBP: 00007f8dfd2c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f8dfd39c050 R15: 00007fffce1061c8
 </TASK>
================================================================================