==================================================================
BUG: KASAN: slab-use-after-free in configfs_dirent_is_ready+0x6b/0x70 fs/configfs/dir.c:363
Read of size 4 at addr ffff888023fb11b8 by task syz.7.754/8762

CPU: 0 UID: 0 PID: 8762 Comm: syz.7.754 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 configfs_dirent_is_ready+0x6b/0x70 fs/configfs/dir.c:363
 create_link fs/configfs/symlink.c:85 [inline]
 configfs_symlink+0x5c4/0x11f0 fs/configfs/symlink.c:199
 vfs_symlink fs/namei.c:5660 [inline]
 vfs_symlink+0x178/0x4d0 fs/namei.c:5639
 filename_symlinkat+0x2a6/0x560 fs/namei.c:5685
 __do_sys_symlinkat fs/namei.c:5705 [inline]
 __se_sys_symlinkat fs/namei.c:5700 [inline]
 __x64_sys_symlinkat+0x9c/0xe0 fs/namei.c:5700
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f117939de99
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:00007f117a1b8028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 00007f1179625fa0 RCX: 00007f117939de99
RDX: 0000200000000340 RSI: ffffffffffffff9c RDI: 0000200000000300
RBP: 00007f1179433eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1179626038 R14: 00007f1179625fa0 R15: 00007ffcc9a8dd58
 </TASK>

Allocated by task 8758:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4612 [inline]
 slab_alloc_node mm/slub.c:4945 [inline]
 kmem_cache_alloc_noprof+0x26b/0x6a0 mm/slub.c:4959
 configfs_new_dirent+0x52/0x570 fs/configfs/dir.c:193
 configfs_make_dirent+0x36/0x1a0 fs/configfs/dir.c:259
 configfs_create_dir+0xbd/0x5c0 fs/configfs/dir.c:304
 configfs_attach_item fs/configfs/dir.c:863 [inline]
 configfs_attach_group+0x2a/0x440 fs/configfs/dir.c:898
 configfs_mkdir+0x65c/0xb70 fs/configfs/dir.c:1423
 vfs_mkdir+0x361/0x850 fs/namei.c:5276
 filename_mkdirat+0x48b/0x5e0 fs/namei.c:5309
 __do_sys_mkdirat fs/namei.c:5330 [inline]
 __se_sys_mkdirat fs/namei.c:5327 [inline]
 __x64_sys_mkdirat+0x89/0xc0 fs/namei.c:5327
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 8765:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2705 [inline]
 slab_free mm/slub.c:6405 [inline]
 kmem_cache_free+0x127/0x6b0 mm/slub.c:6532
 release_configfs_dirent fs/configfs/configfs_internal.h:139 [inline]
 release_configfs_dirent fs/configfs/configfs_internal.h:134 [inline]
 configfs_put fs/configfs/configfs_internal.h:156 [inline]
 configfs_d_iput+0x20d/0x290 fs/configfs/dir.c:63
 dentry_unlink_inode+0x265/0x470 fs/dcache.c:477
 d_delete fs/dcache.c:2695 [inline]
 d_delete+0x213/0x280 fs/dcache.c:2682
 d_delete_notify include/linux/fsnotify.h:379 [inline]
 vfs_rmdir fs/namei.c:5394 [inline]
 vfs_rmdir+0x4ab/0x8a0 fs/namei.c:5354
 filename_rmdir+0x31a/0x5c0 fs/namei.c:5438
 __do_sys_unlinkat fs/namei.c:5613 [inline]
 __se_sys_unlinkat fs/namei.c:5606 [inline]
 __x64_sys_unlinkat+0xf5/0x130 fs/namei.c:5606
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888023fb1180
 which belongs to the cache configfs_dir_cache of size 96
The buggy address is located 56 bytes inside of
 freed 96-byte region [ffff888023fb1180, ffff888023fb11e0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888023fb1a80 pfn:0x23fb1
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff888140487500 ffff88801deee948 ffffea0001f7d710
raw: ffff888023fb1a80 0000000800200010 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 7931, tgid 7929 (syz.2.543), ts 274596752781, free_ts 274579059231
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_slab_page mm/slub.c:3294 [inline]
 allocate_slab mm/slub.c:3408 [inline]
 new_slab+0xa2/0x650 mm/slub.c:3454
 refill_objects+0xe3/0x410 mm/slub.c:7338
 refill_sheaf mm/slub.c:2832 [inline]
 __pcs_replace_empty_main+0x376/0x680 mm/slub.c:4703
 alloc_from_pcs mm/slub.c:4801 [inline]
 slab_alloc_node mm/slub.c:4933 [inline]
 kmem_cache_alloc_noprof+0x46e/0x6a0 mm/slub.c:4959
 configfs_new_dirent+0x52/0x570 fs/configfs/dir.c:193
 configfs_make_dirent+0x36/0x1a0 fs/configfs/dir.c:259
 configfs_create_file+0xfe/0x180 fs/configfs/file.c:454
 populate_attrs fs/configfs/dir.c:640 [inline]
 configfs_attach_item.part.0+0x147/0x4f0 fs/configfs/dir.c:865
 configfs_attach_item fs/configfs/dir.c:927 [inline]
 configfs_attach_group+0x63/0x440 fs/configfs/dir.c:898
 configfs_mkdir+0x65c/0xb70 fs/configfs/dir.c:1423
 vfs_mkdir+0x361/0x850 fs/namei.c:5276
 filename_mkdirat+0x48b/0x5e0 fs/namei.c:5309
 __do_sys_mkdirat fs/namei.c:5330 [inline]
 __se_sys_mkdirat fs/namei.c:5327 [inline]
 __x64_sys_mkdirat+0x89/0xc0 fs/namei.c:5327
page last free pid 7930 tgid 7930 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950
 ___free_pages_bulk mm/kasan/shadow.c:333 [inline]
 __kasan_populate_vmalloc_do mm/kasan/shadow.c:385 [inline]
 __kasan_populate_vmalloc+0x164/0x210 mm/kasan/shadow.c:424
 kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
 alloc_vmap_area+0x95d/0x2bb0 mm/vmalloc.c:2123
 __get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3226
 __vmalloc_node_range_noprof+0x228/0x1630 mm/vmalloc.c:4042
 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:4143
 alloc_thread_stack_node kernel/fork.c:359 [inline]
 dup_task_struct kernel/fork.c:929 [inline]
 copy_process+0x7fb/0x8030 kernel/fork.c:2115
 kernel_clone+0x176/0x9d0 kernel/fork.c:2748
 __do_sys_clone3+0x214/0x290 kernel/fork.c:3050
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888023fb1080: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888023fb1100: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888023fb1180: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                                        ^
 ffff888023fb1200: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888023fb1280: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:82 [inline]
BUG: KASAN: slab-use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
BUG: KASAN: slab-use-after-free in configfs_get fs/configfs/configfs_internal.h:146 [inline]
BUG: KASAN: slab-use-after-free in create_link fs/configfs/symlink.c:92 [inline]
BUG: KASAN: slab-use-after-free in configfs_symlink+0x640/0x11f0 fs/configfs/symlink.c:199
Read of size 4 at addr ffff888023fb1180 by task syz.7.754/8762

CPU: 0 UID: 0 PID: 8762 Comm: syz.7.754 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:186 [inline]
 kasan_check_range+0x10f/0x1e0 mm/kasan/generic.c:200
 instrument_atomic_read include/linux/instrumented.h:82 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
 configfs_get fs/configfs/configfs_internal.h:146 [inline]
 create_link fs/configfs/symlink.c:92 [inline]
 configfs_symlink+0x640/0x11f0 fs/configfs/symlink.c:199
 vfs_symlink fs/namei.c:5660 [inline]
 vfs_symlink+0x178/0x4d0 fs/namei.c:5639
 filename_symlinkat+0x2a6/0x560 fs/namei.c:5685
 __do_sys_symlinkat fs/namei.c:5705 [inline]
 __se_sys_symlinkat fs/namei.c:5700 [inline]
 __x64_sys_symlinkat+0x9c/0xe0 fs/namei.c:5700
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f117939de99
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:00007f117a1b8028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 00007f1179625fa0 RCX: 00007f117939de99
RDX: 0000200000000340 RSI: ffffffffffffff9c RDI: 0000200000000300
RBP: 00007f1179433eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1179626038 R14: 00007f1179625fa0 R15: 00007ffcc9a8dd58
 </TASK>

Allocated by task 8758:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4612 [inline]
 slab_alloc_node mm/slub.c:4945 [inline]
 kmem_cache_alloc_noprof+0x26b/0x6a0 mm/slub.c:4959
 configfs_new_dirent+0x52/0x570 fs/configfs/dir.c:193
 configfs_make_dirent+0x36/0x1a0 fs/configfs/dir.c:259
 configfs_create_dir+0xbd/0x5c0 fs/configfs/dir.c:304
 configfs_attach_item fs/configfs/dir.c:863 [inline]
 configfs_attach_group+0x2a/0x440 fs/configfs/dir.c:898
 configfs_mkdir+0x65c/0xb70 fs/configfs/dir.c:1423
 vfs_mkdir+0x361/0x850 fs/namei.c:5276
 filename_mkdirat+0x48b/0x5e0 fs/namei.c:5309
 __do_sys_mkdirat fs/namei.c:5330 [inline]
 __se_sys_mkdirat fs/namei.c:5327 [inline]
 __x64_sys_mkdirat+0x89/0xc0 fs/namei.c:5327
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 8765:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2705 [inline]
 slab_free mm/slub.c:6405 [inline]
 kmem_cache_free+0x127/0x6b0 mm/slub.c:6532
 release_configfs_dirent fs/configfs/configfs_internal.h:139 [inline]
 release_configfs_dirent fs/configfs/configfs_internal.h:134 [inline]
 configfs_put fs/configfs/configfs_internal.h:156 [inline]
 configfs_d_iput+0x20d/0x290 fs/configfs/dir.c:63
 dentry_unlink_inode+0x265/0x470 fs/dcache.c:477
 d_delete fs/dcache.c:2695 [inline]
 d_delete+0x213/0x280 fs/dcache.c:2682
 d_delete_notify include/linux/fsnotify.h:379 [inline]
 vfs_rmdir fs/namei.c:5394 [inline]
 vfs_rmdir+0x4ab/0x8a0 fs/namei.c:5354
 filename_rmdir+0x31a/0x5c0 fs/namei.c:5438
 __do_sys_unlinkat fs/namei.c:5613 [inline]
 __se_sys_unlinkat fs/namei.c:5606 [inline]
 __x64_sys_unlinkat+0xf5/0x130 fs/namei.c:5606
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888023fb1180
 which belongs to the cache configfs_dir_cache of size 96
The buggy address is located 0 bytes inside of
 freed 96-byte region [ffff888023fb1180, ffff888023fb11e0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888023fb1a80 pfn:0x23fb1
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff888140487500 ffff88801deee948 ffffea0001f7d710
raw: ffff888023fb1a80 0000000800200010 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 7931, tgid 7929 (syz.2.543), ts 274596752781, free_ts 274579059231
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_slab_page mm/slub.c:3294 [inline]
 allocate_slab mm/slub.c:3408 [inline]
 new_slab+0xa2/0x650 mm/slub.c:3454
 refill_objects+0xe3/0x410 mm/slub.c:7338
 refill_sheaf mm/slub.c:2832 [inline]
 __pcs_replace_empty_main+0x376/0x680 mm/slub.c:4703
 alloc_from_pcs mm/slub.c:4801 [inline]
 slab_alloc_node mm/slub.c:4933 [inline]
 kmem_cache_alloc_noprof+0x46e/0x6a0 mm/slub.c:4959
 configfs_new_dirent+0x52/0x570 fs/configfs/dir.c:193
 configfs_make_dirent+0x36/0x1a0 fs/configfs/dir.c:259
 configfs_create_file+0xfe/0x180 fs/configfs/file.c:454
 populate_attrs fs/configfs/dir.c:640 [inline]
 configfs_attach_item.part.0+0x147/0x4f0 fs/configfs/dir.c:865
 configfs_attach_item fs/configfs/dir.c:927 [inline]
 configfs_attach_group+0x63/0x440 fs/configfs/dir.c:898
 configfs_mkdir+0x65c/0xb70 fs/configfs/dir.c:1423
 vfs_mkdir+0x361/0x850 fs/namei.c:5276
 filename_mkdirat+0x48b/0x5e0 fs/namei.c:5309
 __do_sys_mkdirat fs/namei.c:5330 [inline]
 __se_sys_mkdirat fs/namei.c:5327 [inline]
 __x64_sys_mkdirat+0x89/0xc0 fs/namei.c:5327
page last free pid 7930 tgid 7930 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950
 ___free_pages_bulk mm/kasan/shadow.c:333 [inline]
 __kasan_populate_vmalloc_do mm/kasan/shadow.c:385 [inline]
 __kasan_populate_vmalloc+0x164/0x210 mm/kasan/shadow.c:424
 kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
 alloc_vmap_area+0x95d/0x2bb0 mm/vmalloc.c:2123
 __get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3226
 __vmalloc_node_range_noprof+0x228/0x1630 mm/vmalloc.c:4042
 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:4143
 alloc_thread_stack_node kernel/fork.c:359 [inline]
 dup_task_struct kernel/fork.c:929 [inline]
 copy_process+0x7fb/0x8030 kernel/fork.c:2115
 kernel_clone+0x176/0x9d0 kernel/fork.c:2748
 __do_sys_clone3+0x214/0x290 kernel/fork.c:3050
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888023fb1080: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888023fb1100: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888023fb1180: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                   ^
 ffff888023fb1200: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888023fb1280: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
BUG: KASAN: slab-use-after-free in raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
BUG: KASAN: slab-use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
BUG: KASAN: slab-use-after-free in configfs_get fs/configfs/configfs_internal.h:146 [inline]
BUG: KASAN: slab-use-after-free in create_link fs/configfs/symlink.c:92 [inline]
BUG: KASAN: slab-use-after-free in configfs_symlink+0x1188/0x11f0 fs/configfs/symlink.c:199
Read of size 4 at addr ffff888023fb1180 by task syz.7.754/8762

CPU: 0 UID: 0 PID: 8762 Comm: syz.7.754 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
 raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
 configfs_get fs/configfs/configfs_internal.h:146 [inline]
 create_link fs/configfs/symlink.c:92 [inline]
 configfs_symlink+0x1188/0x11f0 fs/configfs/symlink.c:199
 vfs_symlink fs/namei.c:5660 [inline]
 vfs_symlink+0x178/0x4d0 fs/namei.c:5639
 filename_symlinkat+0x2a6/0x560 fs/namei.c:5685
 __do_sys_symlinkat fs/namei.c:5705 [inline]
 __se_sys_symlinkat fs/namei.c:5700 [inline]
 __x64_sys_symlinkat+0x9c/0xe0 fs/namei.c:5700
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f117939de99
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:00007f117a1b8028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 00007f1179625fa0 RCX: 00007f117939de99
RDX: 0000200000000340 RSI: ffffffffffffff9c RDI: 0000200000000300
RBP: 00007f1179433eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1179626038 R14: 00007f1179625fa0 R15: 00007ffcc9a8dd58
 </TASK>

Allocated by task 8758:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4612 [inline]
 slab_alloc_node mm/slub.c:4945 [inline]
 kmem_cache_alloc_noprof+0x26b/0x6a0 mm/slub.c:4959
 configfs_new_dirent+0x52/0x570 fs/configfs/dir.c:193
 configfs_make_dirent+0x36/0x1a0 fs/configfs/dir.c:259
 configfs_create_dir+0xbd/0x5c0 fs/configfs/dir.c:304
 configfs_attach_item fs/configfs/dir.c:863 [inline]
 configfs_attach_group+0x2a/0x440 fs/configfs/dir.c:898
 configfs_mkdir+0x65c/0xb70 fs/configfs/dir.c:1423
 vfs_mkdir+0x361/0x850 fs/namei.c:5276
 filename_mkdirat+0x48b/0x5e0 fs/namei.c:5309
 __do_sys_mkdirat fs/namei.c:5330 [inline]
 __se_sys_mkdirat fs/namei.c:5327 [inline]
 __x64_sys_mkdirat+0x89/0xc0 fs/namei.c:5327
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 8765:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2705 [inline]
 slab_free mm/slub.c:6405 [inline]
 kmem_cache_free+0x127/0x6b0 mm/slub.c:6532
 release_configfs_dirent fs/configfs/configfs_internal.h:139 [inline]
 release_configfs_dirent fs/configfs/configfs_internal.h:134 [inline]
 configfs_put fs/configfs/configfs_internal.h:156 [inline]
 configfs_d_iput+0x20d/0x290 fs/configfs/dir.c:63
 dentry_unlink_inode+0x265/0x470 fs/dcache.c:477
 d_delete fs/dcache.c:2695 [inline]
 d_delete+0x213/0x280 fs/dcache.c:2682
 d_delete_notify include/linux/fsnotify.h:379 [inline]
 vfs_rmdir fs/namei.c:5394 [inline]
 vfs_rmdir+0x4ab/0x8a0 fs/namei.c:5354
 filename_rmdir+0x31a/0x5c0 fs/namei.c:5438
 __do_sys_unlinkat fs/namei.c:5613 [inline]
 __se_sys_unlinkat fs/namei.c:5606 [inline]
 __x64_sys_unlinkat+0xf5/0x130 fs/namei.c:5606
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888023fb1180
 which belongs to the cache configfs_dir_cache of size 96
The buggy address is located 0 bytes inside of
 freed 96-byte region [ffff888023fb1180, ffff888023fb11e0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888023fb1a80 pfn:0x23fb1
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff888140487500 ffff88801deee948 ffffea0001f7d710
raw: ffff888023fb1a80 0000000800200010 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 7931, tgid 7929 (syz.2.543), ts 274596752781, free_ts 274579059231
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_slab_page mm/slub.c:3294 [inline]
 allocate_slab mm/slub.c:3408 [inline]
 new_slab+0xa2/0x650 mm/slub.c:3454
 refill_objects+0xe3/0x410 mm/slub.c:7338
 refill_sheaf mm/slub.c:2832 [inline]
 __pcs_replace_empty_main+0x376/0x680 mm/slub.c:4703
 alloc_from_pcs mm/slub.c:4801 [inline]
 slab_alloc_node mm/slub.c:4933 [inline]
 kmem_cache_alloc_noprof+0x46e/0x6a0 mm/slub.c:4959
 configfs_new_dirent+0x52/0x570 fs/configfs/dir.c:193
 configfs_make_dirent+0x36/0x1a0 fs/configfs/dir.c:259
 configfs_create_file+0xfe/0x180 fs/configfs/file.c:454
 populate_attrs fs/configfs/dir.c:640 [inline]
 configfs_attach_item.part.0+0x147/0x4f0 fs/configfs/dir.c:865
 configfs_attach_item fs/configfs/dir.c:927 [inline]
 configfs_attach_group+0x63/0x440 fs/configfs/dir.c:898
 configfs_mkdir+0x65c/0xb70 fs/configfs/dir.c:1423
 vfs_mkdir+0x361/0x850 fs/namei.c:5276
 filename_mkdirat+0x48b/0x5e0 fs/namei.c:5309
 __do_sys_mkdirat fs/namei.c:5330 [inline]
 __se_sys_mkdirat fs/namei.c:5327 [inline]
 __x64_sys_mkdirat+0x89/0xc0 fs/namei.c:5327
page last free pid 7930 tgid 7930 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950
 ___free_pages_bulk mm/kasan/shadow.c:333 [inline]
 __kasan_populate_vmalloc_do mm/kasan/shadow.c:385 [inline]
 __kasan_populate_vmalloc+0x164/0x210 mm/kasan/shadow.c:424
 kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
 alloc_vmap_area+0x95d/0x2bb0 mm/vmalloc.c:2123
 __get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3226
 __vmalloc_node_range_noprof+0x228/0x1630 mm/vmalloc.c:4042
 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:4143
 alloc_thread_stack_node kernel/fork.c:359 [inline]
 dup_task_struct kernel/fork.c:929 [inline]
 copy_process+0x7fb/0x8030 kernel/fork.c:2115
 kernel_clone+0x176/0x9d0 kernel/fork.c:2748
 __do_sys_clone3+0x214/0x290 kernel/fork.c:3050
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888023fb1080: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888023fb1100: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888023fb1180: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                   ^
 ffff888023fb1200: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888023fb1280: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:112 [inline]
BUG: KASAN: slab-use-after-free in atomic_inc include/linux/atomic/atomic-instrumented.h:435 [inline]
BUG: KASAN: slab-use-after-free in configfs_get fs/configfs/configfs_internal.h:147 [inline]
BUG: KASAN: slab-use-after-free in create_link fs/configfs/symlink.c:92 [inline]
BUG: KASAN: slab-use-after-free in configfs_symlink+0x699/0x11f0 fs/configfs/symlink.c:199
Write of size 4 at addr ffff888023fb1180 by task syz.7.754/8762

CPU: 1 UID: 0 PID: 8762 Comm: syz.7.754 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:186 [inline]
 kasan_check_range+0x10f/0x1e0 mm/kasan/generic.c:200
 instrument_atomic_read_write include/linux/instrumented.h:112 [inline]
 atomic_inc include/linux/atomic/atomic-instrumented.h:435 [inline]
 configfs_get fs/configfs/configfs_internal.h:147 [inline]
 create_link fs/configfs/symlink.c:92 [inline]
 configfs_symlink+0x699/0x11f0 fs/configfs/symlink.c:199
 vfs_symlink fs/namei.c:5660 [inline]
 vfs_symlink+0x178/0x4d0 fs/namei.c:5639
 filename_symlinkat+0x2a6/0x560 fs/namei.c:5685
 __do_sys_symlinkat fs/namei.c:5705 [inline]
 __se_sys_symlinkat fs/namei.c:5700 [inline]
 __x64_sys_symlinkat+0x9c/0xe0 fs/namei.c:5700
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f117939de99
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:00007f117a1b8028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 00007f1179625fa0 RCX: 00007f117939de99
RDX: 0000200000000340 RSI: ffffffffffffff9c RDI: 0000200000000300
RBP: 00007f1179433eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1179626038 R14: 00007f1179625fa0 R15: 00007ffcc9a8dd58
 </TASK>

Allocated by task 8758:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4612 [inline]
 slab_alloc_node mm/slub.c:4945 [inline]
 kmem_cache_alloc_noprof+0x26b/0x6a0 mm/slub.c:4959
 configfs_new_dirent+0x52/0x570 fs/configfs/dir.c:193
 configfs_make_dirent+0x36/0x1a0 fs/configfs/dir.c:259
 configfs_create_dir+0xbd/0x5c0 fs/configfs/dir.c:304
 configfs_attach_item fs/configfs/dir.c:863 [inline]
 configfs_attach_group+0x2a/0x440 fs/configfs/dir.c:898
 configfs_mkdir+0x65c/0xb70 fs/configfs/dir.c:1423
 vfs_mkdir+0x361/0x850 fs/namei.c:5276
 filename_mkdirat+0x48b/0x5e0 fs/namei.c:5309
 __do_sys_mkdirat fs/namei.c:5330 [inline]
 __se_sys_mkdirat fs/namei.c:5327 [inline]
 __x64_sys_mkdirat+0x89/0xc0 fs/namei.c:5327
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 8765:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2705 [inline]
 slab_free mm/slub.c:6405 [inline]
 kmem_cache_free+0x127/0x6b0 mm/slub.c:6532
 release_configfs_dirent fs/configfs/configfs_internal.h:139 [inline]
 release_configfs_dirent fs/configfs/configfs_internal.h:134 [inline]
 configfs_put fs/configfs/configfs_internal.h:156 [inline]
 configfs_d_iput+0x20d/0x290 fs/configfs/dir.c:63
 dentry_unlink_inode+0x265/0x470 fs/dcache.c:477
 d_delete fs/dcache.c:2695 [inline]
 d_delete+0x213/0x280 fs/dcache.c:2682
 d_delete_notify include/linux/fsnotify.h:379 [inline]
 vfs_rmdir fs/namei.c:5394 [inline]
 vfs_rmdir+0x4ab/0x8a0 fs/namei.c:5354
 filename_rmdir+0x31a/0x5c0 fs/namei.c:5438
 __do_sys_unlinkat fs/namei.c:5613 [inline]
 __se_sys_unlinkat fs/namei.c:5606 [inline]
 __x64_sys_unlinkat+0xf5/0x130 fs/namei.c:5606
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888023fb1180
 which belongs to the cache configfs_dir_cache of size 96
The buggy address is located 0 bytes inside of
 freed 96-byte region [ffff888023fb1180, ffff888023fb11e0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888023fb1a80 pfn:0x23fb1
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff888140487500 ffffea00017ed090 ffffea0001f7d710
raw: ffff888023fb1a80 0000000800200010 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 7931, tgid 7929 (syz.2.543), ts 274596752781, free_ts 274579059231
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_slab_page mm/slub.c:3294 [inline]
 allocate_slab mm/slub.c:3408 [inline]
 new_slab+0xa2/0x650 mm/slub.c:3454
 refill_objects+0xe3/0x410 mm/slub.c:7338
 refill_sheaf mm/slub.c:2832 [inline]
 __pcs_replace_empty_main+0x376/0x680 mm/slub.c:4703
 alloc_from_pcs mm/slub.c:4801 [inline]
 slab_alloc_node mm/slub.c:4933 [inline]
 kmem_cache_alloc_noprof+0x46e/0x6a0 mm/slub.c:4959
 configfs_new_dirent+0x52/0x570 fs/configfs/dir.c:193
 configfs_make_dirent+0x36/0x1a0 fs/configfs/dir.c:259
 configfs_create_file+0xfe/0x180 fs/configfs/file.c:454
 populate_attrs fs/configfs/dir.c:640 [inline]
 configfs_attach_item.part.0+0x147/0x4f0 fs/configfs/dir.c:865
 configfs_attach_item fs/configfs/dir.c:927 [inline]
 configfs_attach_group+0x63/0x440 fs/configfs/dir.c:898
 configfs_mkdir+0x65c/0xb70 fs/configfs/dir.c:1423
 vfs_mkdir+0x361/0x850 fs/namei.c:5276
 filename_mkdirat+0x48b/0x5e0 fs/namei.c:5309
 __do_sys_mkdirat fs/namei.c:5330 [inline]
 __se_sys_mkdirat fs/namei.c:5327 [inline]
 __x64_sys_mkdirat+0x89/0xc0 fs/namei.c:5327
page last free pid 7930 tgid 7930 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950
 ___free_pages_bulk mm/kasan/shadow.c:333 [inline]
 __kasan_populate_vmalloc_do mm/kasan/shadow.c:385 [inline]
 __kasan_populate_vmalloc+0x164/0x210 mm/kasan/shadow.c:424
 kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
 alloc_vmap_area+0x95d/0x2bb0 mm/vmalloc.c:2123
 __get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3226
 __vmalloc_node_range_noprof+0x228/0x1630 mm/vmalloc.c:4042
 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:4143
 alloc_thread_stack_node kernel/fork.c:359 [inline]
 dup_task_struct kernel/fork.c:929 [inline]
 copy_process+0x7fb/0x8030 kernel/fork.c:2115
 kernel_clone+0x176/0x9d0 kernel/fork.c:2748
 __do_sys_clone3+0x214/0x290 kernel/fork.c:3050
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888023fb1080: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888023fb1100: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888023fb1180: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                   ^
 ffff888023fb1200: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888023fb1280: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================