loop4: detected capacity change from 0 to 32768
==================================================================
BUG: KASAN: slab-out-of-bounds in dtMoveEntry fs/jfs/jfs_dtree.c:3922 [inline]
BUG: KASAN: slab-out-of-bounds in dtSplitPage+0x1d8a/0x3a10 fs/jfs/jfs_dtree.c:1561
Write of size 1 at addr ffff88805ba95060 by task syz.4.182/6634

CPU: 1 PID: 6634 Comm: syz.4.182 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:468
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 dtMoveEntry fs/jfs/jfs_dtree.c:3922 [inline]
 dtSplitPage+0x1d8a/0x3a10 fs/jfs/jfs_dtree.c:1561
 dtSplitUp fs/jfs/jfs_dtree.c:1092 [inline]
 dtInsert+0x1051/0x5bd0 fs/jfs/jfs_dtree.c:871
 jfs_rename+0x89e/0x1840 fs/jfs/namei.c:1224
 vfs_rename+0xb36/0xe60 fs/namei.c:4927
 do_renameat2+0x8b0/0xc80 fs/namei.c:5080
 __do_sys_rename fs/namei.c:5126 [inline]
 __se_sys_rename fs/namei.c:5124 [inline]
 __x64_sys_rename+0x86/0x90 fs/namei.c:5124
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f105839e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f10591a3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f1058625fa0 RCX: 00007f105839e0d9
RDX: 0000000000000000 RSI: 0000200000000f40 RDI: 00002000000003c0
RBP: 00007f1058435024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1058626038 R14: 00007f1058625fa0 R15: 00007ffc8f9632a8
 </TASK>

Allocated by task 6279:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
 slab_alloc_node mm/slub.c:3495 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 fill_pool lib/debugobjects.c:169 [inline]
 debug_objects_fill_pool+0x57e/0x790 lib/debugobjects.c:654
 __debug_object_init+0x27/0x450 lib/debugobjects.c:666
 hrtimer_init_sleeper_on_stack kernel/time/hrtimer.c:475 [inline]
 hrtimer_nanosleep+0xc2/0x370 kernel/time/hrtimer.c:2141
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1397 [inline]
 __se_sys_clock_nanosleep+0x30f/0x3a0 kernel/time/posix-timers.c:1374
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff88805ba95038
 which belongs to the cache debug_objects_cache of size 40
The buggy address is located 0 bytes to the right of
 allocated 40-byte region [ffff88805ba95038, ffff88805ba95060)

The buggy address belongs to the physical page:
page:ffffea00016ea540 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5ba95
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888017c4f8c0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000490049 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 0x112020(__GFP_HIGH|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 6279, tgid 6279 (syz.0.111), ts 129909282082, free_ts 121451886604
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582
 prep_new_page mm/page_alloc.c:1589 [inline]
 get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221
 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501
 alloc_slab_page+0x5d/0x180 mm/slub.c:1881
 allocate_slab mm/slub.c:2028 [inline]
 new_slab+0x87/0x2d0 mm/slub.c:2081
 ___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253
 __slab_alloc mm/slub.c:3339 [inline]
 __slab_alloc_node mm/slub.c:3392 [inline]
 slab_alloc_node mm/slub.c:3485 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc+0x109/0x2c0 mm/slub.c:3519
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 fill_pool lib/debugobjects.c:169 [inline]
 debug_objects_fill_pool+0x55c/0x790 lib/debugobjects.c:654
 __debug_object_init+0x27/0x450 lib/debugobjects.c:666
 hrtimer_init_sleeper_on_stack kernel/time/hrtimer.c:475 [inline]
 hrtimer_nanosleep+0xc2/0x370 kernel/time/hrtimer.c:2141
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1397 [inline]
 __se_sys_clock_nanosleep+0x30f/0x3a0 kernel/time/posix-timers.c:1374
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1182 [inline]
 free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
 free_large_kmalloc+0x101/0x1b0 mm/slab_common.c:984
 skb_kfree_head net/core/skbuff.c:946 [inline]
 skb_free_head net/core/skbuff.c:958 [inline]
 skb_release_data+0x609/0x7f0 net/core/skbuff.c:988
 skb_release_all net/core/skbuff.c:1054 [inline]
 __kfree_skb net/core/skbuff.c:1068 [inline]
 kfree_skb_reason+0x10e/0x170 net/core/skbuff.c:1104
 dev_kfree_skb_any_reason+0x120/0x130 net/core/dev.c:3241
 dev_kfree_skb_any include/linux/netdevice.h:3917 [inline]
 lan78xx_free_buf_pool drivers/net/usb/lan78xx.c:519 [inline]
 lan78xx_free_rx_resources drivers/net/usb/lan78xx.c:581 [inline]
 lan78xx_probe+0xc94/0x1c70 drivers/net/usb/lan78xx.c:4511
 usb_probe_interface+0x5c2/0xaf0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x247/0xae0 drivers/base/dd.c:717
 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:879
 driver_probe_device+0x4f/0x420 drivers/base/dd.c:909
 __device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1037
 bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
 __device_attach+0x2c1/0x420 drivers/base/dd.c:1109
 bus_probe_device+0x180/0x260 drivers/base/bus.c:580
 device_add+0x87c/0xc40 drivers/base/core.c:3700

Memory state around the buggy address:
 ffff88805ba94f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88805ba94f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88805ba95000: 00 00 00 00 00 fc fc 00 00 00 00 00 fc fc 00 00
                                                       ^
 ffff88805ba95080: 00 00 00 fc fc 00 00 00 00 00 fc fc 00 00 00 00
 ffff88805ba95100: 00 fc fc 00 00 00 00 00 fc fc 00 00 00 00 00 fc
==================================================================