================================================================== 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+0x6f1/0x760 mm/filemap.c:172 Read of size 4 at addr ffff88811c686470 by task syz.3.6054/13189 CPU: 0 PID: 13189 Comm: syz.3.6054 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 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+0x10f/0x150 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+0x6f1/0x760 mm/filemap.c:172 __delete_from_page_cache+0xbe/0x470 mm/filemap.c:240 __remove_mapping+0x601/0x990 mm/vmscan.c:1216 shrink_page_list+0x2a24/0x5800 mm/vmscan.c:1829 shrink_inactive_list mm/vmscan.c:2338 [inline] shrink_list mm/vmscan.c:2583 [inline] shrink_lruvec+0x11eb/0x3b00 mm/vmscan.c:5800 shrink_node_memcgs mm/vmscan.c:5992 [inline] shrink_node+0x11ee/0x2a40 mm/vmscan.c:6022 shrink_zones mm/vmscan.c:6228 [inline] do_try_to_free_pages+0x5a7/0x1580 mm/vmscan.c:6286 try_to_free_mem_cgroup_pages+0x261/0x610 mm/vmscan.c:6608 mem_cgroup_force_empty mm/memcontrol.c:3595 [inline] mem_cgroup_force_empty_write+0x130/0x170 mm/memcontrol.c:3616 cgroup_file_write+0x294/0x560 kernel/cgroup/cgroup.c:4011 kernfs_fop_write_iter+0x2bd/0x400 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2218 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x831/0xfd0 fs/read_write.c:594 ksys_write+0x14a/0x260 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+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 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 RIP: 0033:0x7f2201728f19 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2200177028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f22019a5fa0 RCX: 00007f2201728f19 RDX: 0000000000000001 RSI: 0000200000000380 RDI: 0000000000000003 RBP: 00007f22017b7f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f22019a6038 R14: 00007f22019a5fa0 R15: 00007ffe5d9082c8 Allocated by task 306: 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 mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc+0x13d/0x2c0 mm/slub.c:4436 __kmalloc_node include/linux/slab.h:487 [inline] kmalloc_node include/linux/slab.h:642 [inline] kvmalloc_node+0x211/0x320 mm/util.c:621 kvmalloc include/linux/mm.h:862 [inline] kvmalloc_array include/linux/mm.h:880 [inline] alloc_fdtable+0x10b/0x2e0 fs/file.c:150 dup_fd+0x896/0xad0 fs/file.c:345 copy_files+0x76/0xe0 kernel/fork.c:1631 copy_process+0x1080/0x3230 kernel/fork.c:2343 kernel_clone+0x233/0x960 kernel/fork.c:2744 __do_sys_clone kernel/fork.c:2870 [inline] __se_sys_clone kernel/fork.c:2854 [inline] __x64_sys_clone+0x198/0x210 kernel/fork.c:2854 x64_sys_call+0x41f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:57 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 13152: 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] kfree+0xc4/0x270 mm/slub.c:4588 kvfree+0x35/0x40 mm/util.c:661 __free_fdtable fs/file.c:36 [inline] put_files_struct+0x27a/0x320 fs/file.c:430 exit_files+0x80/0xa0 fs/file.c:443 do_exit+0xb39/0x29a0 kernel/exit.c:891 do_group_exit+0x149/0x310 kernel/exit.c:1010 __do_sys_exit_group kernel/exit.c:1021 [inline] __se_sys_exit_group kernel/exit.c:1019 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1019 x64_sys_call+0x832/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232 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 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 kvfree_call_rcu+0xb6/0x860 kernel/rcu/tree.c:3648 drop_sysctl_table+0x2f5/0x430 fs/proc/proc_sysctl.c:1687 unregister_sysctl_table+0x7a/0x120 fs/proc/proc_sysctl.c:1725 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7219 [inline] addrconf_sysctl_unregister net/ipv6/addrconf.c:7247 [inline] addrconf_ifdown+0x15bf/0x1910 net/ipv6/addrconf.c:3970 addrconf_notify+0x3bd/0xe00 net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2070 [inline] call_netdevice_notifiers_extack net/core/dev.c:2082 [inline] call_netdevice_notifiers net/core/dev.c:2096 [inline] unregister_netdevice_many+0x103d/0x1a00 net/core/dev.c:11177 unregister_netdevice_queue+0x2e1/0x320 net/core/dev.c:11110 br_dev_delete+0xfc/0x110 net/bridge/br_if.c:387 br_dev_newlink+0xef/0x110 net/bridge/br_netlink.c:1455 __rtnl_newlink net/core/rtnetlink.c:3536 [inline] rtnl_newlink+0x137f/0x1900 net/core/rtnetlink.c:3584 rtnetlink_rcv_msg+0x9fd/0xcb0 net/core/rtnetlink.c:5662 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2520 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5680 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x86c/0xa30 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x879/0xb80 net/netlink/af_netlink.c:1923 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2436 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg net/socket.c:2526 [inline] __x64_sys_sendmsg+0x201/0x2d0 net/socket.c:2526 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 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 Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 insert_work+0x51/0x310 kernel/workqueue.c:1373 __queue_work+0x8e1/0xc60 kernel/workqueue.c:1539 queue_work_on+0xde/0x150 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+0x4c1/0xbf0 kernel/rcu/tree.c:2523 rcu_core+0x4a3/0xef0 kernel/rcu/tree.c:2763 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776 handle_softirqs+0x250/0x560 kernel/softirq.c:583 __do_softirq kernel/softirq.c:621 [inline] invoke_softirq kernel/softirq.c:443 [inline] __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:670 irq_exit_rcu+0x9/0x10 kernel/softirq.c:682 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 The buggy address belongs to the object at ffff88811c686000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff88811c686000, ffff88811c686800) The buggy address belongs to the page: page:ffffea000471a000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11c680 head:ffffea000471a000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100043200 raw: 0000000000000000 0000000000080008 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 195, ts 7902099912, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2610 prep_new_page+0x1c/0x110 mm/page_alloc.c:2616 get_page_from_freelist+0x2d42/0x2dd0 mm/page_alloc.c:4492 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5829 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 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] __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954 kmemdup+0x26/0x60 mm/util.c:132 bpf_prog_store_orig_filter net/core/filter.c:1154 [inline] bpf_prog_create_from_user+0x284/0x420 net/core/filter.c:1439 seccomp_prepare_filter kernel/seccomp.c:669 [inline] seccomp_prepare_user_filter kernel/seccomp.c:706 [inline] seccomp_set_mode_filter kernel/seccomp.c:1834 [inline] do_seccomp+0x803/0x1480 kernel/seccomp.c:1954 prctl_set_seccomp+0x4c/0x60 kernel/seccomp.c:2007 __do_sys_prctl kernel/sys.c:2447 [inline] __se_sys_prctl+0x543/0x1210 kernel/sys.c:2365 __x64_sys_prctl+0xbf/0xd0 kernel/sys.c:2365 x64_sys_call+0x633/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:158 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 page_owner free stack trace missing Memory state around the buggy address: ffff88811c686300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811c686380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811c686400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811c686480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811c686500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================