loop1: detected capacity change from 0 to 32768
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:2951:16
index 1381 is out of range for type 's8[1365]' (aka 'signed char[1365]')
CPU: 1 PID: 18193 Comm: syz-executor.1 Not tainted 6.5.0-rc7-syzkaller-gfe4469582053 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233
 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 dump_stack+0x1c/0x28 lib/dump_stack.c:113
 ubsan_epilogue lib/ubsan.c:217 [inline]
 __ubsan_handle_out_of_bounds+0xfc/0x148 lib/ubsan.c:348
 dbFindLeaf+0x2b8/0x3e4 fs/jfs/jfs_dmap.c:2951
 dbAllocDmapLev+0xc4/0x410 fs/jfs/jfs_dmap.c:1959
 dbAllocCtl+0x104/0x840 fs/jfs/jfs_dmap.c:1815
 dbAllocAG+0x208/0xe4c fs/jfs/jfs_dmap.c:1356
 dbAlloc+0x520/0xb68 fs/jfs/jfs_dmap.c:880
 dtSplitUp fs/jfs/jfs_dtree.c:974 [inline]
 dtInsert+0xab0/0x54f4 fs/jfs/jfs_dtree.c:863
 jfs_mkdir+0x6bc/0xa0c fs/jfs/namei.c:270
 vfs_mkdir+0x240/0x3a8 fs/namei.c:4117
 do_mkdirat+0x20c/0x610 fs/namei.c:4140
 __do_sys_mkdirat fs/namei.c:4155 [inline]
 __se_sys_mkdirat fs/namei.c:4153 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4153
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
 el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591
================================================================================
==================================================================
BUG: KASAN: use-after-free in dbFindLeaf+0x24c/0x3e4 fs/jfs/jfs_dmap.c:2951
Read of size 1 at addr ffff0000c1d325b6 by task syz-executor.1/18193

CPU: 1 PID: 18193 Comm: syz-executor.1 Not tainted 6.5.0-rc7-syzkaller-gfe4469582053 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233
 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x174/0x514 mm/kasan/report.c:475
 kasan_report+0xd8/0x138 mm/kasan/report.c:588
 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378
 dbFindLeaf+0x24c/0x3e4 fs/jfs/jfs_dmap.c:2951
 dbAllocDmapLev+0xc4/0x410 fs/jfs/jfs_dmap.c:1959
 dbAllocCtl+0x104/0x840 fs/jfs/jfs_dmap.c:1815
 dbAllocAG+0x208/0xe4c fs/jfs/jfs_dmap.c:1356
 dbAlloc+0x520/0xb68 fs/jfs/jfs_dmap.c:880
 dtSplitUp fs/jfs/jfs_dtree.c:974 [inline]
 dtInsert+0xab0/0x54f4 fs/jfs/jfs_dtree.c:863
 jfs_mkdir+0x6bc/0xa0c fs/jfs/namei.c:270
 vfs_mkdir+0x240/0x3a8 fs/namei.c:4117
 do_mkdirat+0x20c/0x610 fs/namei.c:4140
 __do_sys_mkdirat fs/namei.c:4155 [inline]
 __se_sys_mkdirat fs/namei.c:4153 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4153
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
 el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591

The buggy address belongs to the physical page:
page:00000000326f8e70 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x101d32
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: 0xffffff7f(buddy)
raw: 05ffc00000000000 fffffc00035a3208 fffffc000361b508 0000000000000000
raw: 0000000000000000 0000000000000001 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000c1d32480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000c1d32500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000c1d32580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                     ^
 ffff0000c1d32600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000c1d32680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
BUG at fs/jfs/jfs_dmap.c:2958 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2958!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 18193 Comm: syz-executor.1 Tainted: G    B              6.5.0-rc7-syzkaller-gfe4469582053 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : dbFindLeaf+0x3e0/0x3e4 fs/jfs/jfs_dmap.c:2958
lr : dbFindLeaf+0x3e0/0x3e4 fs/jfs/jfs_dmap.c:2958
sp : ffff80009ce67010
x29: ffff80009ce67020 x28: 0000000000001596 x27: dfff800000000000
x26: 00000000fffffff8 x25: 0000000000001598 x24: ffff80008e643110
x23: 0000000000001595 x22: 000000000007fffe x21: 0000000000000000
x20: ffff0000c1d31010 x19: ffff80009ce670a0 x18: 1fffe0003683f1c6
x17: ffff80008e09d000 x16: ffff80008a572e30 x15: 0000000000000001
x14: 1fffe0003683f22a x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000040000 x10: 000000000003ffff x9 : 325a848fd4953300
x8 : 325a848fd4953300 x7 : 1fffe0003683f1c7 x6 : ffff800080292a1c
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000805a25e4
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000002b
Call trace:
 dbFindLeaf+0x3e0/0x3e4 fs/jfs/jfs_dmap.c:2958
 dbAllocDmapLev+0xc4/0x410 fs/jfs/jfs_dmap.c:1959
 dbAllocCtl+0x104/0x840 fs/jfs/jfs_dmap.c:1815
 dbAllocAG+0x208/0xe4c fs/jfs/jfs_dmap.c:1356
 dbAlloc+0x520/0xb68 fs/jfs/jfs_dmap.c:880
 dtSplitUp fs/jfs/jfs_dtree.c:974 [inline]
 dtInsert+0xab0/0x54f4 fs/jfs/jfs_dtree.c:863
 jfs_mkdir+0x6bc/0xa0c fs/jfs/namei.c:270
 vfs_mkdir+0x240/0x3a8 fs/namei.c:4117
 do_mkdirat+0x20c/0x610 fs/namei.c:4140
 __do_sys_mkdirat fs/namei.c:4155 [inline]
 __se_sys_mkdirat fs/namei.c:4153 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4153
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
 el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591
Code: b0048203 91178063 528171c2 95948aab (d4210000) 
---[ end trace 0000000000000000 ]---