================================================================== 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 ffff88811de70470 by task syz.3.6039/23731 CPU: 0 PID: 23731 Comm: syz.3.6039 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: __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+0x37/0x130 mm/memcontrol.c:6897 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:3869 __generic_file_write_iter+0x268/0x480 mm/filemap.c:3997 generic_file_write_iter+0xa9/0x1d0 mm/filemap.c:4029 __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: 0033:0x7f0acb351bb1 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 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:0000000000000030 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f0acb599090 RCX: 00007f0acb351ba9 RDX: 0000000000000000 RSI: 0000000000000030 RDI: 0000000000000600 RBP: 00007f0acb3d4e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f0acb599128 R14: 00007f0acb599090 R15: 00007ffc11500dd8 The buggy address belongs to the page: page:ffffea0004779c00 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11de70 flags: 0x4000000000000000(zone=1) raw: 4000000000000000 dead000000000100 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102cc2(GFP_HIGHUSER|__GFP_NOWARN), pid 22520, ts 1188062275504, free_ts 1190611239055 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_pages_node include/linux/gfp.h:595 [inline] alloc_pages_node include/linux/gfp.h:609 [inline] pcpu_alloc_pages mm/percpu-vm.c:95 [inline] pcpu_populate_chunk+0x184/0xcb0 mm/percpu-vm.c:285 pcpu_alloc+0xc4d/0x1660 mm/percpu.c:1863 __alloc_percpu_gfp+0x25/0x30 mm/percpu.c:1937 bpf_map_alloc_percpu+0xc5/0x150 kernel/bpf/syscall.c:457 bpf_array_alloc_percpu kernel/bpf/arraymap.c:37 [inline] array_map_alloc+0x39a/0x6d0 kernel/bpf/arraymap.c:153 find_and_alloc_map kernel/bpf/syscall.c:129 [inline] map_create+0x455/0x21b0 kernel/bpf/syscall.c:860 __sys_bpf+0x2cf/0x730 kernel/bpf/syscall.c:4615 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline] __se_sys_bpf kernel/bpf/syscall.c:4735 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4735 x64_sys_call+0x4b9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322 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 pcpu_free_pages mm/percpu-vm.c:65 [inline] pcpu_depopulate_chunk+0x481/0x5a0 mm/percpu-vm.c:330 pcpu_reclaim_populated mm/percpu.c:2195 [inline] pcpu_balance_workfn+0x2a7/0x1150 mm/percpu.c:2247 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472 kthread+0x411/0x500 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff88811de70300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811de70380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88811de70400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88811de70480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811de70500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================