ERROR: (device loop3): dtReadFirst: stbl[0] out of bound
ERROR: (device loop3): remounting filesystem as read-only
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:784:21
index -1 is out of range for type 'struct dtslot[128]'
CPU: 1 UID: 0 PID: 6933 Comm: syz.3.54 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 ubsan_epilogue+0x14/0x48 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xd0/0xfc lib/ubsan.c:455
 dtSearch+0x1664/0x1d00 fs/jfs/jfs_dtree.c:784
 jfs_lookup+0x13c/0x32c fs/jfs/namei.c:1461
 lookup_one_qstr_excl+0x10c/0x2fc fs/namei.c:1747
 __start_dirop fs/namei.c:2866 [inline]
 start_dirop fs/namei.c:2875 [inline]
 filename_create+0x1b4/0x2d8 fs/namei.c:4879
 do_mkdirat+0xc8/0x448 fs/namei.c:5156
 __do_sys_mkdirat fs/namei.c:5186 [inline]
 __se_sys_mkdirat fs/namei.c:5184 [inline]
 __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:5184
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
---[ end trace ]---
==================================================================
BUG: KASAN: slab-out-of-bounds in addressPXD fs/jfs/jfs_types.h:80 [inline]
BUG: KASAN: slab-out-of-bounds in dtSearch+0x1680/0x1d00 fs/jfs/jfs_dtree.c:785
Read of size 4 at addr ffff0000d2230fe0 by task syz.3.54/6933

CPU: 1 UID: 0 PID: 6933 Comm: syz.3.54 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xa8/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0xb0/0x110 mm/kasan/report.c:595
 __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380
 addressPXD fs/jfs/jfs_types.h:80 [inline]
 dtSearch+0x1680/0x1d00 fs/jfs/jfs_dtree.c:785
 jfs_lookup+0x13c/0x32c fs/jfs/namei.c:1461
 lookup_one_qstr_excl+0x10c/0x2fc fs/namei.c:1747
 __start_dirop fs/namei.c:2866 [inline]
 start_dirop fs/namei.c:2875 [inline]
 filename_create+0x1b4/0x2d8 fs/namei.c:4879
 do_mkdirat+0xc8/0x448 fs/namei.c:5156
 __do_sys_mkdirat fs/namei.c:5186 [inline]
 __se_sys_mkdirat fs/namei.c:5184 [inline]
 __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:5184
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

Allocated by task 6916:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:78
 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:570
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x344/0x680 mm/slub.c:5270
 __proc_create+0x300/0x720 fs/proc/generic.c:452
 proc_create_reg+0x88/0x10c fs/proc/generic.c:578
 proc_create_net_data_write+0xac/0x1c8 fs/proc/proc_net.c:165
 afs_proc_init+0x148/0x1f4 fs/afs/proc.c:757
 afs_net_init+0x550/0x74c fs/afs/main.c:106
 ops_init+0x310/0x544 net/core/net_namespace.c:137
 setup_net+0x110/0x2ec net/core/net_namespace.c:446
 copy_net_ns+0x458/0x674 net/core/net_namespace.c:581
 create_new_namespaces+0x318/0x518 kernel/nsproxy.c:130
 unshare_nsproxy_namespaces+0x108/0x158 kernel/nsproxy.c:226
 ksys_unshare+0x420/0x738 kernel/fork.c:3171
 __do_sys_unshare kernel/fork.c:3242 [inline]
 __se_sys_unshare kernel/fork.c:3240 [inline]
 __arm64_sys_unshare+0x3c/0x50 kernel/fork.c:3240
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

The buggy address belongs to the object at ffff0000d2230dc0
 which belongs to the cache proc_dir_entry of size 256
The buggy address is located 288 bytes to the right of
 allocated 256-byte region [ffff0000d2230dc0, ffff0000d2230ec0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112230
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000000 ffff0000c18bca00 dead000000000122 0000000000000000
raw: 0000000000000000 00000000000c000c 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d2230e80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff0000d2230f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000d2230f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                       ^
 ffff0000d2231000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000d2231080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
ERROR: (device loop3): dtSearch: stack overrun!

btstack dump:
bn = 0, index = 0
bn = 20, index = 0
bn = 0, index = 0
bn = 20, index = 0
bn = 0, index = 0
bn = 20, index = 0
bn = 0, index = 0
bn = 0, index = 0
jfs_lookup: dtSearch returned -5
ERROR: (device loop3): dtSearch: stack overrun!

btstack dump:
bn = 0, index = 0
bn = 20, index = 0
bn = 0, index = 0
bn = 20, index = 0
bn = 0, index = 0
bn = 20, index = 0
bn = 0, index = 0
bn = 0, index = 0
jfs_lookup: dtSearch returned -5
veth1_macvtap: entered promiscuous mode
veth1_macvtap: entered allmulticast mode
macsec0: left promiscuous mode
macsec0: left allmulticast mode
veth1_macvtap: left allmulticast mode