================================================================== BUG: KASAN: slab-out-of-bounds in cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline] BUG: KASAN: slab-out-of-bounds in cleancache_invalidate_page include/linux/cleancache.h:110 [inline] BUG: KASAN: slab-out-of-bounds in unaccount_page_cache_page+0x9e0/0xac0 mm/filemap.c:175 Read of size 4 at addr ffff8881115e7470 by task syz.4.1544/5538 CPU: 0 PID: 5538 Comm: syz.4.1544 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 __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+0x9e0/0xac0 mm/filemap.c:175 __delete_from_page_cache+0xc3/0x470 mm/filemap.c:243 __remove_mapping+0x562/0x690 mm/vmscan.c:985 shrink_page_list+0x21a9/0x4250 mm/vmscan.c:1498 shrink_inactive_list+0x532/0xef0 mm/vmscan.c:2075 shrink_list mm/vmscan.c:2294 [inline] shrink_lruvec+0x1235/0x2860 mm/vmscan.c:5473 shrink_node_memcgs mm/vmscan.c:5660 [inline] shrink_node+0xf0c/0x2690 mm/vmscan.c:5690 shrink_zones mm/vmscan.c:5896 [inline] do_try_to_free_pages+0x603/0x1590 mm/vmscan.c:5954 try_to_free_mem_cgroup_pages+0x261/0x610 mm/vmscan.c:6272 try_charge+0x43e/0x1500 mm/memcontrol.c:2745 __mem_cgroup_charge+0x14c/0x6d0 mm/memcontrol.c:6871 mem_cgroup_charge include/linux/memcontrol.h:458 [inline] shmem_add_to_page_cache+0x574/0xe30 mm/shmem.c:699 shmem_getpage_gfp+0x8eb/0x2120 mm/shmem.c:1952 shmem_getpage mm/shmem.c:161 [inline] shmem_write_begin+0xce/0x1b0 mm/shmem.c:2497 generic_perform_write+0x2ce/0x540 mm/filemap.c:3509 __generic_file_write_iter+0x24b/0x480 mm/filemap.c:3638 generic_file_write_iter+0xa9/0x1d0 mm/filemap.c:3670 __kernel_write+0x535/0x910 fs/read_write.c:550 dump_emit+0x246/0x370 fs/coredump.c:855 dump_user_range+0x6a/0x1a0 fs/coredump.c:908 elf_core_dump+0x2866/0x2cc0 fs/binfmt_elf.c:2290 do_coredump+0x1ba3/0x28e0 fs/coredump.c:817 get_signal+0xf23/0x12e0 kernel/signal.c:2779 arch_do_signal_or_restart+0xe2/0x11d0 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:169 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199 irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:287 irqentry_exit+0x12/0x60 kernel/entry/common.c:375 exc_general_protection+0x1ca/0x250 arch/x86/kernel/traps.c:557 asm_exc_general_protection+0x1e/0x30 arch/x86/include/asm/idtentry.h:565 RIP: 0033:0x7efe82ac9e61 Code: 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 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:00002000000003a0 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007efe82d43180 RCX: 00007efe82ac9e59 RDX: 00002000000003c0 RSI: 00002000000003a0 RDI: 0000000000040000 RBP: 00007efe82b5fd6f R08: 0000200000000440 R09: 0000200000000440 R10: 0000200000000400 R11: 0000000000000206 R12: 0000000000000000 R13: 00007efe82d43218 R14: 00007efe82d43180 R15: 00007ffe835584f8 Allocated by task 0: (stack is not available) Freed by task 5: 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:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1600 [inline] slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626 slab_free mm/slub.c:3208 [inline] kfree+0xc0/0x270 mm/slub.c:4196 skb_free_head net/core/skbuff.c:606 [inline] skb_release_data+0x532/0x670 net/core/skbuff.c:626 skb_release_all net/core/skbuff.c:680 [inline] __kfree_skb net/core/skbuff.c:694 [inline] consume_skb+0xab/0x1f0 net/core/skbuff.c:851 netlink_broadcast_filtered+0x117d/0x1270 net/netlink/af_netlink.c:1530 netlink_broadcast net/netlink/af_netlink.c:1552 [inline] nlmsg_multicast include/net/netlink.h:1033 [inline] nlmsg_notify+0xed/0x1b0 net/netlink/af_netlink.c:2546 rtnl_notify+0x9a/0xc0 net/core/rtnetlink.c:740 inet6_rt_notify+0x371/0x480 net/ipv6/route.c:6066 fib6_add_rt2node net/ipv6/ip6_fib.c:1253 [inline] fib6_add+0x217e/0x3c40 net/ipv6/ip6_fib.c:1482 __ip6_ins_rt net/ipv6/route.c:1304 [inline] ip6_ins_rt+0xd3/0x130 net/ipv6/route.c:1314 __ipv6_ifa_notify+0x4df/0xe70 net/ipv6/addrconf.c:6162 ipv6_ifa_notify net/ipv6/addrconf.c:6202 [inline] addrconf_dad_completed+0x18a/0xe20 net/ipv6/addrconf.c:4248 addrconf_dad_work+0xc42/0x1440 net/ipv6/addrconf.c:-1 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301 worker_thread+0xa6a/0x13c0 kernel/workqueue.c:2447 kthread+0x346/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff8881115e7000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 112 bytes to the right of 1024-byte region [ffff8881115e7000, ffff8881115e7400) The buggy address belongs to the page: page:ffffea0004457800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1115e0 head:ffffea0004457800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042f00 raw: 0000000000000000 0000000000100010 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 5354, ts 242338091430, free_ts 242327529266 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x223b/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5384 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2a6/0x450 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] __kmalloc_track_caller+0x1ec/0x320 mm/slub.c:4541 __kmalloc_reserve net/core/skbuff.c:144 [inline] __alloc_skb+0xdc/0x520 net/core/skbuff.c:212 alloc_skb include/linux/skbuff.h:1126 [inline] alloc_uevent_skb+0x85/0x240 lib/kobject_uevent.c:290 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline] kobject_uevent_net_broadcast+0x1a6/0x5a0 lib/kobject_uevent.c:412 kobject_uevent_env+0x52e/0x700 lib/kobject_uevent.c:608 kobject_uevent+0x1d/0x30 lib/kobject_uevent.c:657 netdev_queue_add_kobject net/core/net-sysfs.c:1660 [inline] netdev_queue_update_kobjects+0x1a7/0x390 net/core/net-sysfs.c:1694 register_queue_kobjects net/core/net-sysfs.c:1755 [inline] netdev_register_kobject+0x2af/0x360 net/core/net-sysfs.c:2001 register_netdevice+0xdf0/0x13e0 net/core/dev.c:10069 tun_set_iff+0x812/0xe00 drivers/net/tun.c:2856 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x80b/0x830 mm/page_alloc.c:1629 free_the_page mm/page_alloc.c:5445 [inline] __free_pages+0xd8/0x3b0 mm/page_alloc.c:5454 __free_slab+0xcf/0x190 mm/slub.c:1899 free_slab mm/slub.c:1914 [inline] discard_slab+0x29/0x40 mm/slub.c:1920 __slab_free+0x313/0x3a0 mm/slub.c:3136 do_slab_free mm/slub.c:3196 [inline] ___cache_free+0x10e/0x130 mm/slub.c:3215 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:440 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580 slab_alloc_node mm/slub.c:2952 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc+0x162/0x2d0 mm/slub.c:2965 kmem_cache_alloc_node include/linux/slab.h:426 [inline] __alloc_skb+0x9e/0x520 net/core/skbuff.c:200 alloc_skb include/linux/skbuff.h:1126 [inline] nlmsg_new include/net/netlink.h:953 [inline] rtmsg_ifa+0xfa/0x1d0 net/ipv4/devinet.c:1927 __inet_del_ifa+0x80b/0xd90 net/ipv4/devinet.c:441 inet_del_ifa net/ipv4/devinet.c:479 [inline] inetdev_destroy net/ipv4/devinet.c:320 [inline] inetdev_event+0x66f/0x1040 net/ipv4/devinet.c:1612 Memory state around the buggy address: ffff8881115e7300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881115e7380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881115e7400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881115e7480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881115e7500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================