================================================================== 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 ffff88811abfe470 by task kworker/u4:2/45 CPU: 0 PID: 45 Comm: kworker/u4:2 Tainted: G W 5.15.178-syzkaller-00013-g7d1f9b5c2ff5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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 alloc_slab_page+0x1f/0x80 allocate_slab mm/slub.c:1940 [inline] new_slab+0x397/0x4e0 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+0x4c3/0x550 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_background_flush fs/fs-writeback.c:2178 [inline] wb_do_writeback fs/fs-writeback.c:2266 [inline] wb_workfn+0xc12/0x1110 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 28549: 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] __kmalloc_track_caller+0x13e/0x2c0 mm/slub.c:4954 kmalloc_reserve net/core/skbuff.c:357 [inline] pskb_expand_head+0x113/0x1240 net/core/skbuff.c:1733 netlink_trim+0x19b/0x230 net/netlink/af_netlink.c:1297 netlink_broadcast_filtered+0x66/0x1220 net/netlink/af_netlink.c:1502 netlink_broadcast net/netlink/af_netlink.c:1547 [inline] nlmsg_multicast include/net/netlink.h:1033 [inline] nlmsg_notify+0x101/0x1c0 net/netlink/af_netlink.c:2536 rtnl_notify net/core/rtnetlink.c:759 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:3905 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:3920 [inline] rtmsg_ifinfo+0xe7/0x120 net/core/rtnetlink.c:3926 register_netdevice+0x1135/0x1390 net/core/dev.c:10418 register_netdev+0x3c/0x50 net/core/dev.c:10497 loopback_net_init+0x74/0x150 drivers/net/loopback.c:216 ops_init+0x1cd/0x4a0 net/core/net_namespace.c:138 setup_net+0x34b/0xb50 net/core/net_namespace.c:332 copy_net_ns+0x35f/0x5b0 net/core/net_namespace.c:476 create_new_namespaces+0x416/0x670 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x126/0x180 kernel/nsproxy.c:226 ksys_unshare+0x545/0x980 kernel/fork.c:3166 __do_sys_unshare kernel/fork.c:3240 [inline] __se_sys_unshare kernel/fork.c:3238 [inline] __x64_sys_unshare+0x38/0x40 kernel/fork.c:3238 x64_sys_call+0x728/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:273 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 kvfree_call_rcu+0xb1/0x8b0 kernel/rcu/tree.c:3644 drop_sysctl_table+0x311/0x450 fs/proc/proc_sysctl.c:1680 unregister_sysctl_table+0x7b/0x120 fs/proc/proc_sysctl.c:1718 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175 __devinet_sysctl_unregister net/ipv4/devinet.c:2627 [inline] devinet_sysctl_unregister net/ipv4/devinet.c:2655 [inline] inetdev_destroy net/ipv4/devinet.c:327 [inline] inetdev_event+0x774/0x10a0 net/ipv4/devinet.c:1612 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2026 [inline] call_netdevice_notifiers_extack net/core/dev.c:2038 [inline] call_netdevice_notifiers net/core/dev.c:2052 [inline] unregister_netdevice_many+0xe0a/0x17c0 net/core/dev.c:11118 default_device_exit_batch+0x38a/0x3f0 net/core/dev.c:11651 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x6ce/0xc00 net/core/net_namespace.c:599 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 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 kvfree_call_rcu+0xb1/0x8b0 kernel/rcu/tree.c:3644 drop_sysctl_table+0x311/0x450 fs/proc/proc_sysctl.c:1680 unregister_sysctl_table+0x7b/0x120 fs/proc/proc_sysctl.c:1718 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7168 [inline] addrconf_sysctl_unregister net/ipv6/addrconf.c:7196 [inline] addrconf_ifdown+0x178f/0x1ae0 net/ipv6/addrconf.c:3951 addrconf_notify+0x37d/0xdd0 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2026 [inline] call_netdevice_notifiers_extack net/core/dev.c:2038 [inline] call_netdevice_notifiers net/core/dev.c:2052 [inline] unregister_netdevice_many+0xe0a/0x17c0 net/core/dev.c:11118 sit_exit_batch_net+0x620/0x670 net/ipv6/sit.c:1952 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x6ce/0xc00 net/core/net_namespace.c:599 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 The buggy address belongs to the object at ffff88811abfe000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff88811abfe000, ffff88811abfe800) The buggy address belongs to the page: page:ffffea00046afe00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811abff000 pfn:0x11abf8 head:ffffea00046afe00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea0004542e08 ffffea0004680e08 ffff888100043200 raw: ffff88811abff000 0000000000080002 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 16485, ts 711090515412, free_ts 710989434570 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_trace+0x147/0x270 mm/slub.c:3267 kmalloc include/linux/slab.h:603 [inline] kzalloc include/linux/slab.h:733 [inline] do_check_common+0x185/0x1290 kernel/bpf/verifier.c:13408 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 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_trace+0xf9/0x270 mm/slub.c:3267 kmalloc include/linux/slab.h:603 [inline] kzalloc include/linux/slab.h:733 [inline] ipv6_add_addr+0x419/0xd40 net/ipv6/addrconf.c:1117 addrconf_add_linklocal+0x318/0x9e0 net/ipv6/addrconf.c:3262 Memory state around the buggy address: ffff88811abfe300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811abfe380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811abfe400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811abfe480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811abfe500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================