================================================================== 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+0x6d8/0x750 mm/filemap.c:167 Read of size 4 at addr ffff8881375a8470 by task kworker/u4:3/24619 CPU: 1 PID: 24619 Comm: kworker/u4:3 Tainted: G W 5.15.178-syzkaller-00193-g058abb720bd1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: writeback wb_workfn (flush-8:0) Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 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+0x6d8/0x750 mm/filemap.c:167 __delete_from_page_cache+0xc6/0x5b0 mm/filemap.c:235 __remove_mapping+0x566/0x690 mm/vmscan.c:1208 shrink_page_list+0x2723/0x5c50 mm/vmscan.c:1805 shrink_inactive_list mm/vmscan.c:2312 [inline] shrink_list mm/vmscan.c:2557 [inline] shrink_lruvec+0x17ec/0x4580 mm/vmscan.c:5762 shrink_node_memcgs mm/vmscan.c:5954 [inline] shrink_node+0x1083/0x2550 mm/vmscan.c:5984 shrink_zones mm/vmscan.c:6190 [inline] do_try_to_free_pages+0x5c6/0x1600 mm/vmscan.c:6248 try_to_free_pages+0x3a5/0xd70 mm/vmscan.c:6483 __perform_reclaim mm/page_alloc.c:4949 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4972 [inline] __alloc_pages_slowpath+0x15fe/0x38e0 mm/page_alloc.c:5396 __alloc_pages+0x503/0x8f0 mm/page_alloc.c:5793 allocate_slab mm/slub.c:1932 [inline] new_slab+0x9a/0x4e0 mm/slub.c:1995 ___slab_alloc+0x39e/0x830 mm/slub.c:3028 __slab_alloc+0x4a/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc+0x139/0x250 mm/slub.c:3255 mempool_alloc_slab+0x1d/0x30 mm/mempool.c:513 mempool_alloc+0x3f3/0x550 mm/mempool.c:393 bio_alloc_bioset+0x12a/0x950 block/bio.c:469 bio_alloc include/linux/bio.h:429 [inline] io_submit_init_bio fs/ext4/page-io.c:403 [inline] io_submit_add_bh fs/ext4/page-io.c:428 [inline] ext4_bio_write_page+0x1295/0x1b80 fs/ext4/page-io.c:564 mpage_submit_page+0x18e/0x230 fs/ext4/inode.c:2125 mpage_process_page_bufs+0x6d2/0x8c0 fs/ext4/inode.c:2239 mpage_prepare_extent_to_map+0xa27/0xdd0 fs/ext4/inode.c:2667 ext4_writepages+0xde7/0x4000 fs/ext4/inode.c:2795 do_writepages+0x40e/0x670 mm/page-writeback.c:2388 __writeback_single_inode+0xdf/0xa70 fs/fs-writeback.c:1647 writeback_sb_inodes+0xb2a/0x1920 fs/fs-writeback.c:1930 __writeback_inodes_wb+0x118/0x3f0 fs/fs-writeback.c:2001 wb_writeback+0x3da/0x9f0 fs/fs-writeback.c:2108 wb_check_old_data_flush fs/fs-writeback.c:2212 [inline] wb_do_writeback fs/fs-writeback.c:2265 [inline] wb_workfn+0xb3d/0x1110 fs/fs-writeback.c:2294 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472 kthread+0x421/0x510 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Allocated by task 28074: 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_kmalloc+0xdb/0x110 mm/kasan/common.c:512 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] kmem_cache_alloc_trace+0x11a/0x270 mm/slub.c:3269 kmalloc include/linux/slab.h:603 [inline] kzalloc include/linux/slab.h:733 [inline] copy_verifier_state+0x57a/0xcc0 kernel/bpf/verifier.c:975 is_state_visited kernel/bpf/verifier.c:11064 [inline] do_check+0x47a0/0xf2c0 kernel/bpf/verifier.c:11179 do_check_common+0x909/0x1290 kernel/bpf/verifier.c:13457 do_check_main kernel/bpf/verifier.c:13520 [inline] bpf_check+0x3851/0x12c60 kernel/bpf/verifier.c:14091 bpf_prog_load+0x12ac/0x1b50 kernel/bpf/syscall.c:2333 __sys_bpf+0x4bc/0x760 kernel/bpf/syscall.c:4638 __do_sys_bpf kernel/bpf/syscall.c:4742 [inline] __se_sys_bpf kernel/bpf/syscall.c:4740 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4740 x64_sys_call+0x87f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 28074: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x160 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:1723 [inline] slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749 slab_free mm/slub.c:3521 [inline] kfree+0xcc/0x270 mm/slub.c:4583 free_func_state kernel/bpf/verifier.c:908 [inline] free_verifier_state+0xe3/0x220 kernel/bpf/verifier.c:924 free_states kernel/bpf/verifier.c:13370 [inline] do_check_common+0xd16/0x1290 kernel/bpf/verifier.c:13469 do_check_main kernel/bpf/verifier.c:13520 [inline] bpf_check+0x3851/0x12c60 kernel/bpf/verifier.c:14091 bpf_prog_load+0x12ac/0x1b50 kernel/bpf/syscall.c:2333 __sys_bpf+0x4bc/0x760 kernel/bpf/syscall.c:4638 __do_sys_bpf kernel/bpf/syscall.c:4742 [inline] __se_sys_bpf kernel/bpf/syscall.c:4740 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4740 x64_sys_call+0x87f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 insert_work+0x56/0x320 kernel/workqueue.c:1373 __queue_work+0x92a/0xcd0 kernel/workqueue.c:1539 queue_work_on+0x105/0x170 kernel/workqueue.c:1566 queue_work include/linux/workqueue.h:510 [inline] schedule_work include/linux/workqueue.h:571 [inline] destroy_super_rcu+0xd1/0xe0 fs/super.c:172 rcu_do_batch+0x57a/0xc10 kernel/rcu/tree.c:2523 rcu_core+0x517/0x1020 kernel/rcu/tree.c:2763 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776 handle_softirqs+0x25e/0x5c0 kernel/softirq.c:565 __do_softirq kernel/softirq.c:603 [inline] invoke_softirq kernel/softirq.c:425 [inline] __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:652 irq_exit_rcu+0x9/0x10 kernel/softirq.c:664 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3007 [inline] call_rcu+0x123/0x10b0 kernel/rcu/tree.c:3125 __put_super+0x26d/0x2e0 fs/super.c:299 put_super fs/super.c:313 [inline] deactivate_locked_super+0xe1/0x110 fs/super.c:346 deactivate_super+0xbe/0xf0 fs/super.c:366 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150 task_work_run+0x129/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff8881375a8000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff8881375a8000, ffff8881375a8800) The buggy address belongs to the page: page:ffffea0004dd6a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881375a9000 pfn:0x1375a8 head:ffffea0004dd6a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea00049f8e08 ffffea00052f9008 ffff888100043200 raw: ffff8881375a9000 0000000000080003 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 289, ts 410029047215, free_ts 410015034355 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5780 allocate_slab mm/slub.c:1932 [inline] new_slab+0x9a/0x4e0 mm/slub.c:1995 ___slab_alloc+0x39e/0x830 mm/slub.c:3028 __slab_alloc+0x4a/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3250 [inline] __kmalloc+0x172/0x2c0 mm/slub.c:4427 __kmalloc_node include/linux/slab.h:469 [inline] kmalloc_node include/linux/slab.h:626 [inline] kvmalloc_node+0x1f0/0x4d0 mm/util.c:628 kvmalloc include/linux/mm.h:851 [inline] xt_alloc_table_info+0x42/0xb0 net/netfilter/x_tables.c:1192 do_replace net/ipv6/netfilter/ip6_tables.c:1145 [inline] do_ip6t_set_ctl+0xb1b/0x1220 net/ipv6/netfilter/ip6_tables.c:1646 nf_setsockopt+0x274/0x2a0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x2a07/0x4240 net/ipv6/ipv6_sockglue.c:1011 tcp_setsockopt+0x22d/0x3800 net/ipv4/tcp.c:3706 sock_common_setsockopt+0xa2/0xc0 net/core/sock.c:3462 __sys_setsockopt+0x4dc/0x840 net/socket.c:2203 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+0x7c8/0x7d0 mm/page_alloc.c:3534 free_unref_page+0xe8/0x750 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5856 __free_slab+0xec/0x1d0 mm/slub.c:2020 free_slab mm/slub.c:2035 [inline] discard_slab mm/slub.c:2041 [inline] __unfreeze_partials+0x165/0x1a0 mm/slub.c:2527 put_cpu_partial+0xc4/0x120 mm/slub.c:2607 __slab_free+0x1c8/0x290 mm/slub.c:3390 do_slab_free mm/slub.c:3509 [inline] ___cache_free+0x109/0x120 mm/slub.c:3530 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x44/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3240 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc+0xf5/0x250 mm/slub.c:3255 kmem_cache_alloc_node include/linux/slab.h:474 [inline] __alloc_skb+0xbe/0x550 net/core/skbuff.c:416 alloc_skb include/linux/skbuff.h:1183 [inline] alloc_skb_with_frags+0xa6/0x680 net/core/skbuff.c:6194 Memory state around the buggy address: ffff8881375a8300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881375a8380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881375a8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881375a8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881375a8500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================