syzbot

==================================================================
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+0x6f2/0x760 mm/filemap.c:172
Read of size 4 at addr ffff888113790470 by task syz.0.3619/14147

CPU: 0 PID: 14147 Comm: syz.0.3619 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0xee/0x150 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+0xf1/0x140 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+0x6f2/0x760 mm/filemap.c:172
 __delete_from_page_cache+0xbe/0x420 mm/filemap.c:240
 __remove_mapping+0x60b/0x930 mm/vmscan.c:1216
 shrink_page_list+0x2778/0x5040 mm/vmscan.c:1824
 shrink_inactive_list mm/vmscan.c:2331 [inline]
 shrink_list mm/vmscan.c:2576 [inline]
 shrink_lruvec+0x10f3/0x36a0 mm/vmscan.c:5793
 shrink_node_memcgs mm/vmscan.c:5985 [inline]
 shrink_node+0x11e9/0x2a70 mm/vmscan.c:6015
 shrink_zones mm/vmscan.c:6221 [inline]
 do_try_to_free_pages+0x57e/0x1550 mm/vmscan.c:6279
 try_to_free_pages+0x4b3/0xba0 mm/vmscan.c:6514
 __perform_reclaim mm/page_alloc.c:4955 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4978 [inline]
 __alloc_pages_slowpath+0x1330/0x2e30 mm/page_alloc.c:5424
 __alloc_pages+0x31c/0x440 mm/page_alloc.c:5821
 vm_area_alloc_pages mm/vmalloc.c:-1 [inline]
 __vmalloc_area_node mm/vmalloc.c:2981 [inline]
 __vmalloc_node_range+0x505/0xaf0 mm/vmalloc.c:3147
 __bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline]
 bpf_map_area_alloc+0xd5/0xe0 kernel/bpf/syscall.c:335
 prealloc_elems_and_freelist+0x8a/0x1e0 kernel/bpf/stackmap.c:70
 stack_map_alloc+0x3d6/0x580 kernel/bpf/stackmap.c:137
 find_and_alloc_map kernel/bpf/syscall.c:129 [inline]
 map_create+0x455/0x21b0 kernel/bpf/syscall.c:860
 __sys_bpf+0x2cf/0x730 kernel/bpf/syscall.c:4615
 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4735 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4735
 x64_sys_call+0x4b9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
 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: 0033:0x7fed13282ec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fed11ceb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fed134d9fa0 RCX: 00007fed13282ec9
RDX: 0000000000000048 RSI: 0000200000000280 RDI: 0000000000000000
RBP: 00007fed13305f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fed134da038 R14: 00007fed134d9fa0 R15: 00007fffb9aae2f8
 </TASK>

Allocated by task 14425:
 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+0xda/0x110 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 __kmalloc_track_caller+0x13c/0x2c0 mm/slub.c:4959
 kmalloc_reserve net/core/skbuff.c:357 [inline]
 __alloc_skb+0x21a/0x740 net/core/skbuff.c:428
 alloc_skb include/linux/skbuff.h:1183 [inline]
 ip6_frag_next+0x11a/0xaa0 net/ipv6/ip6_output.c:777
 ip6_fragment+0x10c7/0x1e60 net/ipv6/ip6_output.c:988
 __ip6_finish_output+0x63c/0x7d0 net/ipv6/ip6_output.c:199
 ip6_finish_output+0x31/0x240 net/ipv6/ip6_output.c:211
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip6_output+0x1d1/0x3b0 net/ipv6/ip6_output.c:234
 dst_output include/net/dst.h:453 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip6_xmit+0xc02/0x12f0 net/ipv6/ip6_output.c:338
 inet6_csk_xmit+0x2d9/0x430 net/ipv6/inet6_connection_sock.c:135
 l2tp_xmit_queue net/l2tp/l2tp_core.c:1009 [inline]
 l2tp_xmit_core net/l2tp/l2tp_core.c:1104 [inline]
 l2tp_xmit_skb+0xee0/0x1860 net/l2tp/l2tp_core.c:1120
 pppol2tp_sendmsg+0x361/0x600 net/l2tp/l2tp_ppp.c:319
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 sock_write_iter+0x29c/0x380 net/socket.c:1079
 do_iter_readv_writev+0x491/0x600 fs/read_write.c:-1
 do_iter_write+0x1fa/0x7b0 fs/read_write.c:855
 vfs_writev+0x2c9/0x540 fs/read_write.c:928
 do_writev+0x14a/0x2b0 fs/read_write.c:971
 __do_sys_writev fs/read_write.c:1044 [inline]
 __se_sys_writev fs/read_write.c:1041 [inline]
 __x64_sys_writev+0x7d/0x90 fs/read_write.c:1041
 x64_sys_call+0x974/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:21
 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 13206:
 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
 skb_free_head net/core/skbuff.c:656 [inline]
 skb_release_data+0x814/0xa10 net/core/skbuff.c:678
 skb_release_all net/core/skbuff.c:743 [inline]
 __kfree_skb net/core/skbuff.c:757 [inline]
 kfree_skb_reason net/core/skbuff.c:778 [inline]
 kfree_skb+0xb9/0x2f0 net/core/skbuff.c:792
 inet_frag_rbtree_purge net/ipv4/inet_fragment.c:277 [inline]
 inet_frag_destroy+0x13c/0x230 net/ipv4/inet_fragment.c:297
 inet_frag_put include/net/inet_frag.h:142 [inline]
 ipv6_frag_rcv+0x1531/0x24c0 net/ipv6/reassembly.c:386
 ip6_protocol_deliver_rcu+0xaae/0x1410 net/ipv6/ip6_input.c:425
 ip6_input_finish net/ipv6/ip6_input.c:466 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip6_input+0xd3/0x1e0 net/ipv6/ip6_input.c:475
 ip6_mc_input+0x20d/0x2a0 net/ipv6/ip6_input.c:569
 dst_input include/net/dst.h:463 [inline]
 ip6_rcv_finish+0x18d/0x360 net/ipv6/ip6_input.c:79
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ipv6_rcv+0xe9/0x210 net/ipv6/ip6_input.c:300
 __netif_receive_skb_one_core net/core/dev.c:5533 [inline]
 __netif_receive_skb+0xc8/0x280 net/core/dev.c:5647
 process_backlog+0x368/0x600 net/core/dev.c:6524
 __napi_poll+0xbe/0x590 net/core/dev.c:7083
 napi_poll net/core/dev.c:7150 [inline]
 net_rx_action+0x371/0x8e0 net/core/dev.c:7240
 handle_softirqs+0x250/0x560 kernel/softirq.c:583
 __do_softirq+0xb/0xd kernel/softirq.c:621

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+0x8e5/0xc60 kernel/workqueue.c:1539
 queue_work_on+0xd2/0x140 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+0x51d/0xba0 kernel/rcu/tree.c:2523
 rcu_core+0x5e4/0xf80 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

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
 __call_rcu_common kernel/rcu/tree.c:3011 [inline]
 call_rcu+0x105/0xfe0 kernel/rcu/tree.c:3129
 __put_super+0x26b/0x2d0 fs/super.c:299
 put_super fs/super.c:313 [inline]
 deactivate_locked_super+0xd4/0x100 fs/super.c:346
 mount_bdev+0x2cc/0x3e0 fs/super.c:1402
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4705
 legacy_get_tree+0xed/0x190 fs/fs_context.c:611
 vfs_get_tree+0x89/0x260 fs/super.c:1530
 do_new_mount+0x25a/0xa20 fs/namespace.c:3025
 path_mount+0x675/0x1020 fs/namespace.c:3355
 do_mount fs/namespace.c:3368 [inline]
 __do_sys_mount fs/namespace.c:3576 [inline]
 __se_sys_mount+0x318/0x380 fs/namespace.c:3553
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3553
 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 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

The buggy address belongs to the object at ffff888113790000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1136 bytes inside of
 2048-byte region [ffff888113790000, ffff888113790800)
The buggy address belongs to the page:
page:ffffea00044de400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113790
head:ffffea00044de400 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 0x1d28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1549, ts 86758141834, free_ts 85651477249
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485
 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5808
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa1/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x381/0x810 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
 kmalloc_reserve net/core/skbuff.c:357 [inline]
 pskb_expand_head+0x11b/0x11d0 net/core/skbuff.c:1733
 netlink_trim+0x193/0x230 net/netlink/af_netlink.c:1303
 netlink_broadcast_filtered+0x78/0x1230 net/netlink/af_netlink.c:1515
 netlink_broadcast net/netlink/af_netlink.c:1560 [inline]
 nlmsg_multicast include/net/netlink.h:1033 [inline]
 nlmsg_notify+0xed/0x1b0 net/netlink/af_netlink.c:2554
 rtnl_notify net/core/rtnetlink.c:759 [inline]
 rtmsg_ifinfo_send net/core/rtnetlink.c:3908 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:3923 [inline]
 rtmsg_ifinfo+0xea/0x130 net/core/rtnetlink.c:3929
 register_netdevice+0x112a/0x13a0 net/core/dev.c:10450
 register_netdev+0x3e/0x50 net/core/dev.c:10529
 ip6_tnl_init_net+0x2e4/0x3a0 net/ipv6/ip6_tunnel.c:2286
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+0x542/0x550 mm/page_alloc.c:3534
 free_unref_page+0xa2/0x550 mm/page_alloc.c:3616
 free_the_page mm/page_alloc.c:805 [inline]
 __free_pages+0x6c/0x100 mm/page_alloc.c:5884
 __free_slab+0xe8/0x1e0 mm/slub.c:2025
 free_slab mm/slub.c:2040 [inline]
 discard_slab mm/slub.c:2046 [inline]
 __unfreeze_partials+0x160/0x190 mm/slub.c:2532
 put_cpu_partial+0xc6/0x120 mm/slub.c:2612
 __slab_free+0x1d4/0x290 mm/slub.c:3395
 do_slab_free mm/slub.c:3514 [inline]
 ___cache_free+0x104/0x120 mm/slub.c:3535
 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157
 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:443
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3245 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 __kmalloc_track_caller+0x11f/0x2c0 mm/slub.c:4954
 kmalloc_reserve net/core/skbuff.c:357 [inline]
 __alloc_skb+0x21a/0x740 net/core/skbuff.c:428
 alloc_skb_fclone include/linux/skbuff.h:1233 [inline]
 sk_stream_alloc_skb+0x21a/0xb60 net/ipv4/tcp.c:889

Memory state around the buggy address:
 ffff888113790300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888113790380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888113790400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff888113790480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888113790500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================