==================================================================
BUG: KASAN: use-after-free in cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline]
BUG: KASAN: use-after-free in cleancache_invalidate_page include/linux/cleancache.h:110 [inline]
BUG: KASAN: use-after-free in unaccount_page_cache_page+0x6f2/0x760 mm/filemap.c:172
Read of size 4 at addr ffff888117234470 by task syz.2.2254/9183

CPU: 0 PID: 9183 Comm: syz.2.2254 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0xf1/0x140 mm/kasan/report.c:444
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline]
 cleancache_invalidate_page include/linux/cleancache.h:110 [inline]
 unaccount_page_cache_page+0x6f2/0x760 mm/filemap.c:172
 __delete_from_page_cache+0xbe/0x420 mm/filemap.c:240
 __remove_mapping+0x60b/0x930 mm/vmscan.c:1216
 shrink_page_list+0x2778/0x5040 mm/vmscan.c:1824
 shrink_inactive_list mm/vmscan.c:2331 [inline]
 shrink_list mm/vmscan.c:2576 [inline]
 shrink_lruvec+0x10f3/0x36a0 mm/vmscan.c:5793
 shrink_node_memcgs mm/vmscan.c:5985 [inline]
 shrink_node+0x11e9/0x2a70 mm/vmscan.c:6015
 shrink_zones mm/vmscan.c:6221 [inline]
 do_try_to_free_pages+0x57e/0x1550 mm/vmscan.c:6279
 try_to_free_mem_cgroup_pages+0x233/0x5b0 mm/vmscan.c:6593
 try_charge_memcg+0x3da/0x1450 mm/memcontrol.c:2713
 try_charge mm/memcontrol.c:2838 [inline]
 charge_memcg+0x6d/0x1a0 mm/memcontrol.c:6861
 __mem_cgroup_charge+0x8d/0x270 mm/memcontrol.c:6898
 mem_cgroup_charge include/linux/memcontrol.h:715 [inline]
 shmem_add_to_page_cache+0x62f/0xc30 mm/shmem.c:723
 shmem_getpage_gfp+0x1164/0x2310 mm/shmem.c:1946
 shmem_getpage mm/shmem.c:156 [inline]
 shmem_write_begin+0xce/0x1b0 mm/shmem.c:2480
 generic_perform_write+0x2ad/0x670 mm/filemap.c:3870
 __generic_file_write_iter+0x268/0x480 mm/filemap.c:3998
 generic_file_write_iter+0xa9/0x1d0 mm/filemap.c:4030
 __kernel_write+0x4e7/0x910 fs/read_write.c:539
 __dump_emit+0x240/0x360 fs/coredump.c:880
 dump_emit+0x383/0x3f0 fs/coredump.c:917
 dump_user_range+0x86/0x1c0 fs/coredump.c:954
 elf_core_dump+0x2ae5/0x3020 fs/binfmt_elf.c:2285
 do_coredump+0x141b/0x2860 fs/coredump.c:831
 get_signal+0x38d/0x1480 kernel/signal.c:2893
 arch_do_signal_or_restart+0xc1/0x10f0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:320
 irqentry_exit+0x12/0x40 kernel/entry/common.c:411
 exc_page_fault+0x5e/0xb0 arch/x86/mm/fault.c:1568
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f4561e7c751
Code: 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:0000000000000040 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f45620d3180 RCX: 00007f4561e7c749
RDX: 0000000000000000 RSI: 0000000000000040 RDI: 0000000081248080
RBP: 00007f4561f00f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007f45620d3218 R14: 00007f45620d3180 R15: 00007ffe7ddfc2d8
 </TASK>

Allocated by task 604:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 __kasan_slab_alloc+0xbd/0xf0 mm/kasan/common.c:466
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3245 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260
 getname_flags+0xb9/0x500 fs/namei.c:138
 user_path_at_empty+0x30/0x1c0 fs/namei.c:2890
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0xfb/0xa60 fs/stat.c:221
 vfs_fstatat fs/stat.c:243 [inline]
 __do_sys_newfstatat fs/stat.c:411 [inline]
 __se_sys_newfstatat+0xc6/0x340 fs/stat.c:405
 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:405
 x64_sys_call+0x2c1/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 604:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
 slab_free mm/slub.c:3526 [inline]
 kmem_cache_free+0x100/0x320 mm/slub.c:3544
 putname fs/namei.c:271 [inline]
 user_path_at_empty+0x161/0x1c0 fs/namei.c:2893
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0xfb/0xa60 fs/stat.c:221
 vfs_fstatat fs/stat.c:243 [inline]
 __do_sys_newfstatat fs/stat.c:411 [inline]
 __se_sys_newfstatat+0xc6/0x340 fs/stat.c:405
 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:405
 x64_sys_call+0x2c1/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff888117234400
 which belongs to the cache names_cache of size 4096
The buggy address is located 112 bytes inside of
 4096-byte region [ffff888117234400, ffff888117235400)
The buggy address belongs to the page:
page:ffffea00045c8c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x117230
head:ffffea00045c8c00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 dead000000000100 dead000000000122 ffff8881001c4480
raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 101, ts 148318128372, free_ts 148278822515
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485
 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5808
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa1/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x381/0x810 mm/slub.c:3033
 __slab_alloc+0x49/0x90 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0x138/0x260 mm/slub.c:3260
 getname_flags+0xb9/0x500 fs/namei.c:138
 getname+0x19/0x20 fs/namei.c:217
 do_sys_openat2+0xd9/0x7b0 fs/open.c:1230
 do_sys_open fs/open.c:1252 [inline]
 __do_sys_openat fs/open.c:1268 [inline]
 __se_sys_openat fs/open.c:1263 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1263
 x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1472 [inline]
 free_pcp_prepare mm/page_alloc.c:1544 [inline]
 free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534
 free_unref_page+0xa2/0x550 mm/page_alloc.c:3616
 free_the_page mm/page_alloc.c:805 [inline]
 __free_pages+0x6c/0x100 mm/page_alloc.c:5884
 __free_slab+0xe8/0x1e0 mm/slub.c:2025
 free_slab mm/slub.c:2040 [inline]
 discard_slab mm/slub.c:2046 [inline]
 __unfreeze_partials+0x160/0x190 mm/slub.c:2532
 put_cpu_partial+0xc6/0x120 mm/slub.c:2612
 __slab_free+0x1d4/0x290 mm/slub.c:3395
 do_slab_free mm/slub.c:3514 [inline]
 ___cache_free+0x104/0x120 mm/slub.c:3535
 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157
 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:443
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3245 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260
 vm_area_dup+0x26/0x210 kernel/fork.c:368
 __split_vma+0xac/0x3e0 mm/mmap.c:2753

Memory state around the buggy address:
 ffff888117234300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888117234380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888117234400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff888117234480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888117234500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
syz.2.2254 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000
CPU: 0 PID: 9183 Comm: syz.2.2254 Tainted: G    B   W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
 dump_stack+0x15/0x20 lib/dump_stack.c:113
 dump_header+0xdd/0x650 mm/oom_kill.c:473
 oom_kill_process+0x1fa/0x2c0 mm/oom_kill.c:1040
 out_of_memory+0x649/0xa40 mm/oom_kill.c:1183
 mem_cgroup_out_of_memory+0x275/0x370 mm/memcontrol.c:1705
 mem_cgroup_oom mm/memcontrol.c:1940 [inline]
 try_charge_memcg+0xe88/0x1450 mm/memcontrol.c:2761
 try_charge mm/memcontrol.c:2838 [inline]
 charge_memcg+0x6d/0x1a0 mm/memcontrol.c:6861
 __mem_cgroup_charge+0x8d/0x270 mm/memcontrol.c:6898
 mem_cgroup_charge include/linux/memcontrol.h:715 [inline]
 shmem_add_to_page_cache+0x62f/0xc30 mm/shmem.c:723
 shmem_getpage_gfp+0x1164/0x2310 mm/shmem.c:1946
 shmem_getpage mm/shmem.c:156 [inline]
 shmem_write_begin+0xce/0x1b0 mm/shmem.c:2480
 generic_perform_write+0x2ad/0x670 mm/filemap.c:3870
 __generic_file_write_iter+0x268/0x480 mm/filemap.c:3998
 generic_file_write_iter+0xa9/0x1d0 mm/filemap.c:4030
 __kernel_write+0x4e7/0x910 fs/read_write.c:539
 __dump_emit+0x240/0x360 fs/coredump.c:880
 dump_emit+0x383/0x3f0 fs/coredump.c:917
 dump_user_range+0x86/0x1c0 fs/coredump.c:954
 elf_core_dump+0x2ae5/0x3020 fs/binfmt_elf.c:2285
 do_coredump+0x141b/0x2860 fs/coredump.c:831
 get_signal+0x38d/0x1480 kernel/signal.c:2893
 arch_do_signal_or_restart+0xc1/0x10f0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:320
 irqentry_exit+0x12/0x40 kernel/entry/common.c:411
 exc_page_fault+0x5e/0xb0 arch/x86/mm/fault.c:1568
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f4561e7c751
Code: 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:0000000000000040 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f45620d3180 RCX: 00007f4561e7c749
RDX: 0000000000000000 RSI: 0000000000000040 RDI: 0000000081248080
RBP: 00007f4561f00f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007f45620d3218 R14: 00007f45620d3180 R15: 00007ffe7ddfc2d8
 </TASK>
memory: usage 307200kB, limit 307200kB, failcnt 18567
memory+swap: usage 427400kB, limit 9007199254740988kB, failcnt 0
kmem: usage 0kB, limit 9007199254740988kB, failcnt 0
Memory cgroup stats for 
/syz2:
anon 151552
file 309506048
kernel_stack 0
pagetables 0
percpu 0
sock 0
shmem 309506048
file_mapped 0
file_dirty 0
file_writeback 0
swapcached 148283392
anon_thp 0
file_thp 0
shmem_thp 0
inactive_anon 312864768
active_anon 1703936
inactive_file 4096
active_file 0
unevictable 0
slab_reclaimable 0
slab_unreclaimable 0
slab 0
workingset_refault_anon 0
workingset_refault_file 32
workingset_activate_anon 0
oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null)
,cpuset=
syz2
,mems_allowed=0
,oom_memcg=
/syz2
,task_memcg=
/syz2
,task=syz.2.2254,pid=9174,uid=0
Memory cgroup out of memory: Killed process 9174 (syz.2.2254) total-vm:90248kB, anon-rss:1156kB, file-rss:49984kB, shmem-rss:0kB, UID:0 pgtables:176kB oom_score_adj:1000