==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0xe8/0x110 lib/list_debug.c:62
Read of size 8 at addr ffff88807d2f35d0 by task kworker/u4:11/10156

CPU: 1 PID: 10156 Comm: kworker/u4:11 Not tainted 6.0.0-syzkaller-02770-g79d878f7ad8e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:317 [inline]
 print_report.cold+0x2ba/0x719 mm/kasan/report.c:433
 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
 __list_del_entry_valid+0xe8/0x110 lib/list_debug.c:62
 __list_del_entry include/linux/list.h:134 [inline]
 list_del include/linux/list.h:148 [inline]
 unregister_shrinker mm/vmscan.c:736 [inline]
 unregister_shrinker+0x83/0x2f0 mm/vmscan.c:730
 nfsd_reply_cache_shutdown+0x22/0x280 fs/nfsd/nfscache.c:210
 nfsd_exit_net+0x110/0x4c0 fs/nfsd/nfsctl.c:1479
 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:162
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594
 process_one_work+0x991/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>

Allocated by task 4585:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:437 [inline]
 ____kasan_kmalloc mm/kasan/common.c:516 [inline]
 ____kasan_kmalloc mm/kasan/common.c:475 [inline]
 __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525
 kmalloc_reserve net/core/skbuff.c:437 [inline]
 __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:509
 alloc_skb include/linux/skbuff.h:1265 [inline]
 ip_frag_next+0x11e/0x990 net/ipv4/ip_output.c:692
 ip_do_fragment+0x86c/0x1700 net/ipv4/ip_output.c:902
 ip_fragment.constprop.0+0x16b/0x240 net/ipv4/ip_output.c:581
 __ip_finish_output net/ipv4/ip_output.c:304 [inline]
 __ip_finish_output+0x2de/0x650 net/ipv4/ip_output.c:288
 ip_finish_output+0x2d/0x280 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip_output+0x19f/0x310 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:445 [inline]
 ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:126
 iptunnel_xmit+0x67a/0x9e0 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x143f/0x3170 net/ipv4/ip_tunnel.c:813
 ipgre_xmit+0x6e0/0x900 net/ipv4/ip_gre.c:661
 __netdev_start_xmit include/linux/netdevice.h:4840 [inline]
 netdev_start_xmit include/linux/netdevice.h:4854 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x183/0x880 net/core/dev.c:3606
 __dev_queue_xmit+0x2c31/0x3ad0 net/core/dev.c:4256
 dev_queue_xmit include/linux/netdevice.h:3008 [inline]
 __bpf_tx_skb net/core/filter.c:2116 [inline]
 __bpf_redirect_no_mac net/core/filter.c:2141 [inline]
 __bpf_redirect+0x666/0xe30 net/core/filter.c:2164
 ____bpf_clone_redirect net/core/filter.c:2431 [inline]
 bpf_clone_redirect+0x2ae/0x420 net/core/filter.c:2403
 bpf_prog_e2f29814702bf05a+0x56/0x5e
 bpf_dispatcher_nop_func include/linux/bpf.h:963 [inline]
 __bpf_prog_run include/linux/filter.h:600 [inline]
 bpf_prog_run include/linux/filter.h:607 [inline]
 bpf_test_run+0x381/0x9d0 net/bpf/test_run.c:402
 bpf_prog_test_run_skb+0xbab/0x1e60 net/bpf/test_run.c:1182
 bpf_prog_test_run kernel/bpf/syscall.c:3630 [inline]
 __sys_bpf+0x10a0/0x4cf0 kernel/bpf/syscall.c:4983
 __do_sys_bpf kernel/bpf/syscall.c:5069 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5067 [inline]
 __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:5067
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 4585:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:45
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:367 [inline]
 ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329
 kasan_slab_free include/linux/kasan.h:200 [inline]
 slab_free_hook mm/slub.c:1759 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1785
 slab_free mm/slub.c:3539 [inline]
 kfree+0xe2/0x580 mm/slub.c:4567
 skb_free_head+0xac/0x110 net/core/skbuff.c:760
 skb_release_data+0x5f1/0x870 net/core/skbuff.c:789
 skb_release_all net/core/skbuff.c:854 [inline]
 __kfree_skb net/core/skbuff.c:868 [inline]
 kfree_skb_reason+0x14e/0x410 net/core/skbuff.c:891
 kfree_skb_list_reason+0x47/0x70 net/core/skbuff.c:901
 __dev_xmit_skb net/core/dev.c:3886 [inline]
 __dev_queue_xmit+0x236b/0x3ad0 net/core/dev.c:4222
 dev_queue_xmit include/linux/netdevice.h:3008 [inline]
 neigh_hh_output include/net/neighbour.h:530 [inline]
 neigh_output include/net/neighbour.h:544 [inline]
 ip_finish_output2+0x14d3/0x2170 net/ipv4/ip_output.c:228
 ip_do_fragment+0x7fa/0x1700 net/ipv4/ip_output.c:913
 ip_fragment.constprop.0+0x16b/0x240 net/ipv4/ip_output.c:581
 __ip_finish_output net/ipv4/ip_output.c:304 [inline]
 __ip_finish_output+0x2de/0x650 net/ipv4/ip_output.c:288
 ip_finish_output+0x2d/0x280 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip_output+0x19f/0x310 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:445 [inline]
 ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:126
 iptunnel_xmit+0x67a/0x9e0 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x143f/0x3170 net/ipv4/ip_tunnel.c:813
 ipgre_xmit+0x6e0/0x900 net/ipv4/ip_gre.c:661
 __netdev_start_xmit include/linux/netdevice.h:4840 [inline]
 netdev_start_xmit include/linux/netdevice.h:4854 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x183/0x880 net/core/dev.c:3606
 __dev_queue_xmit+0x2c31/0x3ad0 net/core/dev.c:4256
 dev_queue_xmit include/linux/netdevice.h:3008 [inline]
 __bpf_tx_skb net/core/filter.c:2116 [inline]
 __bpf_redirect_no_mac net/core/filter.c:2141 [inline]
 __bpf_redirect+0x666/0xe30 net/core/filter.c:2164
 ____bpf_clone_redirect net/core/filter.c:2431 [inline]
 bpf_clone_redirect+0x2ae/0x420 net/core/filter.c:2403
 bpf_prog_e2f29814702bf05a+0x56/0x5e
 bpf_dispatcher_nop_func include/linux/bpf.h:963 [inline]
 __bpf_prog_run include/linux/filter.h:600 [inline]
 bpf_prog_run include/linux/filter.h:607 [inline]
 bpf_test_run+0x381/0x9d0 net/bpf/test_run.c:402
 bpf_prog_test_run_skb+0xbab/0x1e60 net/bpf/test_run.c:1182
 bpf_prog_test_run kernel/bpf/syscall.c:3630 [inline]
 __sys_bpf+0x10a0/0x4cf0 kernel/bpf/syscall.c:4983
 __do_sys_bpf kernel/bpf/syscall.c:5069 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5067 [inline]
 __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:5067
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff88807d2f3000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1488 bytes inside of
 2048-byte region [ffff88807d2f3000, ffff88807d2f3800)

The buggy address belongs to the physical page:
page:ffffea0001f4bc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d2f0
head:ffffea0001f4bc00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888011842000
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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3253, tgid 3251 (syz-executor.2), ts 910243344253, free_ts 910066672411
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283
 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5549
 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:1829 [inline]
 allocate_slab+0x27e/0x3d0 mm/slub.c:1974
 new_slab mm/slub.c:2034 [inline]
 ___slab_alloc+0x84f/0xe80 mm/slub.c:3036
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3123
 slab_alloc_node mm/slub.c:3214 [inline]
 __kmalloc_node_track_caller+0x2f1/0x390 mm/slub.c:4964
 kmalloc_reserve net/core/skbuff.c:437 [inline]
 __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:509
 alloc_skb include/linux/skbuff.h:1265 [inline]
 ip_frag_next+0x11e/0x990 net/ipv4/ip_output.c:692
 ip_do_fragment+0x86c/0x1700 net/ipv4/ip_output.c:902
 ip_fragment.constprop.0+0x16b/0x240 net/ipv4/ip_output.c:581
 __ip_finish_output net/ipv4/ip_output.c:304 [inline]
 __ip_finish_output+0x2de/0x650 net/ipv4/ip_output.c:288
 ip_finish_output+0x2d/0x280 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip_mc_output+0x21b/0x700 net/ipv4/ip_output.c:415
 dst_output include/net/dst.h:445 [inline]
 ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:126
 iptunnel_xmit+0x67a/0x9e0 net/ipv4/ip_tunnel_core.c:82
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1449 [inline]
 free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499
 free_unref_page_prepare mm/page_alloc.c:3380 [inline]
 free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:447
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:727 [inline]
 slab_alloc_node mm/slub.c:3248 [inline]
 __kmalloc_node+0x2a9/0x380 mm/slub.c:4473
 kmalloc_node include/linux/slab.h:623 [inline]
 kvmalloc_node+0x3f/0x1b0 mm/util.c:613
 kvmalloc include/linux/slab.h:750 [inline]
 kvmemdup_bpfptr include/linux/bpfptr.h:70 [inline]
 ___bpf_copy_key kernel/bpf/syscall.c:1297 [inline]
 map_update_elem kernel/bpf/syscall.c:1413 [inline]
 __sys_bpf+0x41f3/0x4cf0 kernel/bpf/syscall.c:4953
 __do_sys_bpf kernel/bpf/syscall.c:5069 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5067 [inline]
 __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:5067
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88807d2f3480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807d2f3500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807d2f3580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff88807d2f3600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807d2f3680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================