ERROR: (device loop2): txCommit: 
ERROR: (device loop2): dtReadFirst: stbl[0] out of bound
ERROR: (device loop2): remounting filesystem as read-only
==================================================================
BUG: KASAN: slab-out-of-bounds in addressPXD fs/jfs/jfs_types.h:80 [inline]
BUG: KASAN: slab-out-of-bounds in dtSearch+0x19ca/0x2050 fs/jfs/jfs_dtree.c:785
Read of size 4 at addr ffff8880720bdfe0 by task syz.2.36/4491

CPU: 1 PID: 4491 Comm: syz.2.36 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 addressPXD fs/jfs/jfs_types.h:80 [inline]
 dtSearch+0x19ca/0x2050 fs/jfs/jfs_dtree.c:785
 jfs_lookup+0x152/0x380 fs/jfs/namei.c:1459
 __lookup_slow+0x27d/0x3d0 fs/namei.c:1671
 lookup_slow+0x53/0x70 fs/namei.c:1688
 walk_component+0x319/0x460 fs/namei.c:1984
 link_path_walk+0x662/0xd40 fs/namei.c:-1
 path_openat+0x27d/0x2f30 fs/namei.c:3746
 do_filp_open+0x1b3/0x3e0 fs/namei.c:3777
 do_sys_openat2+0x142/0x4a0 fs/open.c:1255
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1282
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f4a688ba749
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:00007f4a66b00038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f4a68b11090 RCX: 00007f4a688ba749
RDX: 0000000000000000 RSI: 0000200000000180 RDI: ffffffffffffff9c
RBP: 00007f4a6893ef91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4a68b11128 R14: 00007f4a68b11090 R15: 00007ffdd423d878
 </TASK>

The buggy address belongs to the page:
page:ffffea0001c82f40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x720bd
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x100cc0(GFP_USER), pid 4181, ts 86362090125, free_ts 86361798967
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487
 __get_free_pages+0x8/0x30 mm/page_alloc.c:5524
 kasan_populate_vmalloc_pte+0x21/0xc0 mm/kasan/shadow.c:266
 apply_to_pte_range mm/memory.c:2573 [inline]
 apply_to_pmd_range mm/memory.c:2617 [inline]
 apply_to_pud_range mm/memory.c:2653 [inline]
 apply_to_p4d_range mm/memory.c:2689 [inline]
 __apply_to_page_range+0x983/0xd10 mm/memory.c:2725
 alloc_vmap_area+0x19f7/0x1b20 mm/vmalloc.c:1572
 __get_vm_area_node+0x14f/0x2d0 mm/vmalloc.c:2430
 __vmalloc_node_range+0xef/0x8b0 mm/vmalloc.c:3027
 __vmalloc_node mm/vmalloc.c:3087 [inline]
 vzalloc+0x75/0x80 mm/vmalloc.c:3157
 alloc_counters+0xd0/0x730 net/ipv4/netfilter/ip_tables.c:800
 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:822 [inline]
 get_entries net/ipv4/netfilter/ip_tables.c:1023 [inline]
 do_ipt_get_ctl+0x9f7/0x1070 net/ipv4/netfilter/ip_tables.c:1669
 nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116
 ip_getsockopt+0x115a/0x1590 net/ipv4/ip_sockglue.c:1797
 tcp_getsockopt+0x1e3/0x2390 net/ipv4/tcp.c:4319
 __sys_getsockopt+0x1b0/0x230 net/socket.c:2257
 __do_sys_getsockopt net/socket.c:2272 [inline]
 __se_sys_getsockopt net/socket.c:2269 [inline]
 __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2269
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
 free_unref_page+0x94/0x280 mm/page_alloc.c:3396
 __vunmap+0x8ab/0xa40 mm/vmalloc.c:2628
 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:867 [inline]
 get_entries net/ipv4/netfilter/ip_tables.c:1023 [inline]
 do_ipt_get_ctl+0xe07/0x1070 net/ipv4/netfilter/ip_tables.c:1669
 nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116
 ip_getsockopt+0x115a/0x1590 net/ipv4/ip_sockglue.c:1797
 tcp_getsockopt+0x1e3/0x2390 net/ipv4/tcp.c:4319
 __sys_getsockopt+0x1b0/0x230 net/socket.c:2257
 __do_sys_getsockopt net/socket.c:2272 [inline]
 __se_sys_getsockopt net/socket.c:2269 [inline]
 __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2269
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Memory state around the buggy address:
 ffff8880720bde80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880720bdf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880720bdf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                       ^
 ffff8880720be000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880720be080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================