================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_xtree.c:360:4
index 18 is out of range for type 'xad_t [18]'
CPU: 1 PID: 980 Comm: kworker/u4:6 Not tainted 6.5.0-rc6-next-20230816-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Workqueue: writeback wb_workfn (flush-7:3)
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
 xtSearch+0x12e2/0x1650 fs/jfs/jfs_xtree.c:360
 xtLookup+0x273/0x840 fs/jfs/jfs_xtree.c:152
 jfs_get_block+0x325/0xb20 fs/jfs/inode.c:218
 __mpage_writepage+0xa56/0x1740 fs/mpage.c:559
 write_cache_pages+0x49d/0xd70 mm/page-writeback.c:2474
 mpage_writepages+0xfc/0x1a0 fs/mpage.c:679
 do_writepages+0x1b4/0x690 mm/page-writeback.c:2553
 __writeback_single_inode+0x158/0xe70 fs/fs-writeback.c:1603
 writeback_sb_inodes+0x599/0x1010 fs/fs-writeback.c:1894
 __writeback_inodes_wb+0xff/0x2d0 fs/fs-writeback.c:1965
 wb_writeback+0x7f8/0xa90 fs/fs-writeback.c:2072
 wb_check_start_all fs/fs-writeback.c:2198 [inline]
 wb_do_writeback fs/fs-writeback.c:2224 [inline]
 wb_workfn+0x9ab/0xfd0 fs/fs-writeback.c:2257
 process_one_work+0x887/0x15d0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8bb/0x1290 kernel/workqueue.c:2784
 kthread+0x33a/0x430 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
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