================================================================== 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 ffff88811f481470 by task kswapd0/46 CPU: 1 PID: 46 Comm: kswapd0 Not tainted 5.15.178-syzkaller-00193-g058abb720bd1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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 kswapd_shrink_node mm/vmscan.c:6734 [inline] balance_pgdat+0x15e1/0x2f50 mm/vmscan.c:6924 kswapd+0x698/0xd60 mm/vmscan.c:7183 kthread+0x421/0x510 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Allocated by task 277: 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+0xb1/0xe0 mm/kasan/common.c:466 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_fclone include/linux/skbuff.h:1233 [inline] sk_stream_alloc_skb+0x1f8/0xad0 net/ipv4/tcp.c:889 tso_fragment net/ipv4/tcp_output.c:2131 [inline] tcp_write_xmit+0xdac/0x5e80 net/ipv4/tcp_output.c:2693 tcp_push_one+0xb2/0x100 net/ipv4/tcp_output.c:2906 tcp_sendmsg_locked+0x20dc/0x3a90 net/ipv4/tcp.c:1410 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1457 inet_sendmsg+0xa1/0xc0 net/ipv4/af_inet.c:830 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] sock_write_iter+0x39b/0x530 net/socket.c:1079 call_write_iter include/linux/fs.h:2206 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xd5d/0x1110 fs/read_write.c:594 ksys_write+0x199/0x2c0 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:656 x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 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 The buggy address belongs to the object at ffff88811f481400 which belongs to the cache skbuff_fclone_cache of size 504 The buggy address is located 112 bytes inside of 504-byte region [ffff88811f481400, ffff88811f4815f8) The buggy address belongs to the page: page:ffffea00047d2000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811f481b80 pfn:0x11f480 head:ffffea00047d2000 order:1 compound_mapcount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea00073acd00 0000000b0000000b ffff8881081aa780 raw: ffff88811f481b80 00000000800c0003 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 343, ts 2676545689727, free_ts 2644489121052 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] kmem_cache_alloc+0x139/0x250 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_fclone include/linux/skbuff.h:1233 [inline] tipc_buf_acquire+0x2b/0xe0 net/tipc/msg.c:72 tipc_msg_build+0x9cd/0x1230 net/tipc/msg.c:453 tipc_sendmcast net/tipc/socket.c:881 [inline] __tipc_sendmsg+0x2203/0x3240 net/tipc/socket.c:1469 tipc_sendmsg+0x55/0x70 net/tipc/socket.c:1403 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2436 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2526 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 getname_flags+0xba/0x520 fs/namei.c:138 user_path_at_empty+0x2d/0x1a0 fs/namei.c:2882 Memory state around the buggy address: ffff88811f481300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc ffff88811f481380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88811f481400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811f481480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811f481500: fb fb fb fb fb fb fb fb fb fb 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