loop0: detected capacity change from 0 to 32768
==================================================================
BUG: KASAN: slab-out-of-bounds in dtMoveEntry fs/jfs/jfs_dtree.c:3931 [inline]
BUG: KASAN: slab-out-of-bounds in dtSplitPage+0x1bce/0x36a0 fs/jfs/jfs_dtree.c:1558
Write of size 1 at addr ffff88807ab480c0 by task syz.0.441/7878

CPU: 0 UID: 0 PID: 7878 Comm: syz.0.441 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 dtMoveEntry fs/jfs/jfs_dtree.c:3931 [inline]
 dtSplitPage+0x1bce/0x36a0 fs/jfs/jfs_dtree.c:1558
 dtSplitUp fs/jfs/jfs_dtree.c:1089 [inline]
 dtInsert+0x1080/0x5cb0 fs/jfs/jfs_dtree.c:868
 jfs_symlink+0x8a1/0xfb0 fs/jfs/namei.c:1021
 vfs_symlink+0x18b/0x330 fs/namei.c:5889
 filename_symlinkat+0x1cd/0x410 fs/namei.c:5914
 __do_sys_symlinkat fs/namei.c:5934 [inline]
 __se_sys_symlinkat+0x4e/0x2b0 fs/namei.c:5929
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f637239e159
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:00007f63732d5028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 00007f6372625fa0 RCX: 00007f637239e159
RDX: 00002000000005c0 RSI: ffffffffffffff9c RDI: 0000200000000700
RBP: 00007f6372435024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6372626038 R14: 00007f6372625fa0 R15: 00007ffeccb1fbc8
 </TASK>

Allocated by task 6084:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4683 [inline]
 slab_alloc_node mm/slub.c:4996 [inline]
 kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5010
 __kernfs_new_node+0xe6/0x980 fs/kernfs/dir.c:665
 kernfs_new_node+0xea/0x140 fs/kernfs/dir.c:751
 __kernfs_create_file+0x4b/0x2e0 fs/kernfs/file.c:1050
 sysfs_add_file_mode_ns+0x237/0x300 fs/sysfs/file.c:316
 create_files fs/sysfs/group.c:82 [inline]
 internal_create_group+0x679/0x1180 fs/sysfs/group.c:189
 internal_create_groups fs/sysfs/group.c:229 [inline]
 sysfs_create_groups+0x59/0x120 fs/sysfs/group.c:255
 device_add_groups drivers/base/core.c:2911 [inline]
 device_add_attrs+0xde/0x600 drivers/base/core.c:2975
 device_add+0x488/0xb80 drivers/base/core.c:3715
 netdev_register_kobject+0x197/0x350 net/core/net-sysfs.c:2340
 register_netdevice+0x142e/0x1eb0 net/core/dev.c:11503
 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:1080 [inline]
 nsim_create+0xbd7/0x1150 drivers/net/netdevsim/netdev.c:1162
 __nsim_dev_port_add+0x7f8/0xcd0 drivers/net/netdevsim/dev.c:1434
 nsim_dev_port_add_all+0x37/0xf0 drivers/net/netdevsim/dev.c:1495
 nsim_dev_reload_create drivers/net/netdevsim/dev.c:1547 [inline]
 nsim_dev_reload_up+0x4dd/0x880 drivers/net/netdevsim/dev.c:983
 devlink_reload+0x4b2/0x890 net/devlink/dev.c:475
 devlink_pernet_pre_exit+0x1ff/0x420 net/devlink/core.c:578
 ops_pre_exit_list net/core/net_namespace.c:161 [inline]
 ops_undo_list+0x17d/0x8f0 net/core/net_namespace.c:235
 cleanup_net+0x572/0x810 net/core/net_namespace.c:706
 process_one_work kernel/workqueue.c:3399 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3482
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3563
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff88807ab48000
 which belongs to the cache kernfs_node_cache of size 176
The buggy address is located 16 bytes to the right of
 allocated 176-byte region [ffff88807ab48000, ffff88807ab480b0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ab48
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801ca908c0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000200110011 00000000f5000000 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6084, tgid 6084 (kworker/u8:17), ts 269039855960
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1853
 prep_new_page mm/page_alloc.c:1861 [inline]
 get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3925
 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5418
 alloc_slab_page mm/slub.c:3347 [inline]
 allocate_slab+0x7d/0x620 mm/slub.c:3462
 new_slab mm/slub.c:3513 [inline]
 refill_objects+0x2d5/0x350 mm/slub.c:7416
 refill_sheaf mm/slub.c:2885 [inline]
 __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774
 alloc_from_pcs mm/slub.c:4850 [inline]
 slab_alloc_node mm/slub.c:4984 [inline]
 kmem_cache_alloc_noprof+0x394/0x600 mm/slub.c:5010
 __kernfs_new_node+0xe6/0x980 fs/kernfs/dir.c:665
 kernfs_new_node+0xea/0x140 fs/kernfs/dir.c:751
 __kernfs_create_file+0x4b/0x2e0 fs/kernfs/file.c:1050
 sysfs_add_file_mode_ns+0x237/0x300 fs/sysfs/file.c:316
 create_files fs/sysfs/group.c:82 [inline]
 internal_create_group+0x679/0x1180 fs/sysfs/group.c:189
 netdev_queue_add_kobject net/core/net-sysfs.c:1987 [inline]
 netdev_queue_update_kobjects+0x311/0x6b0 net/core/net-sysfs.c:2035
 register_queue_kobjects net/core/net-sysfs.c:2098 [inline]
 netdev_register_kobject+0x277/0x350 net/core/net-sysfs.c:2344
 register_netdevice+0x142e/0x1eb0 net/core/dev.c:11503
 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:1080 [inline]
 nsim_create+0xbd7/0x1150 drivers/net/netdevsim/netdev.c:1162
page last free pid 7750 tgid 7743 ts 268832357300 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1400 [inline]
 __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2944
 rcu_do_batch kernel/rcu/tree.c:2650 [inline]
 rcu_core+0x926/0x1260 kernel/rcu/tree.c:2919
 handle_softirqs+0x226/0x860 kernel/softirq.c:645
 __do_softirq kernel/softirq.c:679 [inline]
 invoke_softirq kernel/softirq.c:519 [inline]
 __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674

Memory state around the buggy address:
 ffff88807ab47f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807ab48000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807ab48080: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00
                                           ^
 ffff88807ab48100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807ab48180: 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00
==================================================================