==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0xa6/0x130 lib/list_debug.c:62
Read of size 8 at addr ffff88807dccd5d0 by task syz-executor.4/12626

CPU: 0 PID: 12626 Comm: syz-executor.4 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description+0x65/0x4b0 mm/kasan/report.c:317
 print_report+0x108/0x220 mm/kasan/report.c:433
 kasan_report+0xfb/0x130 mm/kasan/report.c:495
 __list_del_entry_valid+0xa6/0x130 lib/list_debug.c:62
 __list_del_entry include/linux/list.h:134 [inline]
 list_del include/linux/list.h:148 [inline]
 unregister_shrinker+0x6a/0x320 mm/vmscan.c:736
 nfsd_reply_cache_shutdown+0x2d/0x290 fs/nfsd/nfscache.c:210
 nfsd_exit_net+0x24/0x60 fs/nfsd/nfsctl.c:1479
 ops_exit_list net/core/net_namespace.c:162 [inline]
 setup_net+0x8fd/0xc10 net/core/net_namespace.c:348
 copy_net_ns+0x359/0x5b0 net/core/net_namespace.c:471
 create_new_namespaces+0x4db/0x8e0 kernel/nsproxy.c:110
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x1a55/0x3fc0 kernel/fork.c:2257
 kernel_clone+0x227/0x640 kernel/fork.c:2672
 __do_sys_clone3 kernel/fork.c:2964 [inline]
 __se_sys_clone3+0x372/0x410 kernel/fork.c:2948
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f39d0e8b5a9
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f39d1fda038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007f39d0fac050 RCX: 00007f39d0e8b5a9
RDX: 0000000000000000 RSI: 0000000000000058 RDI: 00007f39d1fda050
RBP: 00007f39d0ee6580 R08: 0000000000000000 R09: 0000000000000058
R10: 00007f39d1fda050 R11: 0000000000000246 R12: 0000000000000058
R13: 00007ffd91253fdf R14: 00007f39d1fda300 R15: 0000000000022000
 </TASK>

Allocated by task 12630:
 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:437 [inline]
 ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:516
 kasan_kmalloc include/linux/kasan.h:234 [inline]
 __kmalloc+0x226/0x370 mm/slub.c:4429
 kmalloc include/linux/slab.h:605 [inline]
 kzalloc include/linux/slab.h:733 [inline]
 ops_init+0x85/0x430 net/core/net_namespace.c:124
 setup_net+0x4bb/0xc10 net/core/net_namespace.c:325
 copy_net_ns+0x359/0x5b0 net/core/net_namespace.c:471
 create_new_namespaces+0x4db/0x8e0 kernel/nsproxy.c:110
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x1a55/0x3fc0 kernel/fork.c:2257
 kernel_clone+0x227/0x640 kernel/fork.c:2672
 __do_sys_clone3 kernel/fork.c:2964 [inline]
 __se_sys_clone3+0x372/0x410 kernel/fork.c:2948
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 12630:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4c/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:367
 kasan_slab_free include/linux/kasan.h:200 [inline]
 slab_free_hook mm/slub.c:1759 [inline]
 slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1785
 slab_free mm/slub.c:3539 [inline]
 kfree+0xda/0x210 mm/slub.c:4567
 ops_init+0x333/0x430 net/core/net_namespace.c:139
 setup_net+0x4bb/0xc10 net/core/net_namespace.c:325
 copy_net_ns+0x359/0x5b0 net/core/net_namespace.c:471
 create_new_namespaces+0x4db/0x8e0 kernel/nsproxy.c:110
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x1a55/0x3fc0 kernel/fork.c:2257
 kernel_clone+0x227/0x640 kernel/fork.c:2672
 __do_sys_clone3 kernel/fork.c:2964 [inline]
 __se_sys_clone3+0x372/0x410 kernel/fork.c:2948
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348
 call_rcu+0x163/0x9c0 kernel/rcu/tree.c:2796
 netlink_release+0x12fc/0x1720 net/netlink/af_netlink.c:815
 __sock_release net/socket.c:650 [inline]
 sock_release+0x7a/0x140 net/socket.c:678
 xfrm_user_net_exit+0x66/0xa0 net/xfrm/xfrm_user.c:3748
 ops_exit_list net/core/net_namespace.c:167 [inline]
 cleanup_net+0x80c/0xc50 net/core/net_namespace.c:594
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Second to last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348
 call_rcu+0x163/0x9c0 kernel/rcu/tree.c:2796
 netlink_release+0x12fc/0x1720 net/netlink/af_netlink.c:815
 __sock_release net/socket.c:650 [inline]
 sock_release+0x7a/0x140 net/socket.c:678
 diag_net_exit+0x3c/0x60 net/core/sock_diag.c:325
 ops_exit_list net/core/net_namespace.c:162 [inline]
 cleanup_net+0x758/0xc50 net/core/net_namespace.c:594
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

The buggy address belongs to the object at ffff88807dccd000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1488 bytes inside of
 2048-byte region [ffff88807dccd000, ffff88807dccd800)

The buggy address belongs to the physical page:
page:ffffea0001f73200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7dcc8
head:ffffea0001f73200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888012042000
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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5727, tgid 5719 (syz-executor.2), ts 269652928561, free_ts 269617155678
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549
 alloc_slab_page+0x70/0xf0 mm/slub.c:1829
 allocate_slab+0x5e/0x520 mm/slub.c:1974
 new_slab mm/slub.c:2034 [inline]
 ___slab_alloc+0x42e/0xce0 mm/slub.c:3036
 __slab_alloc mm/slub.c:3123 [inline]
 slab_alloc_node mm/slub.c:3214 [inline]
 slab_alloc mm/slub.c:3256 [inline]
 kmem_cache_alloc_trace+0x25f/0x310 mm/slub.c:3287
 kmalloc include/linux/slab.h:600 [inline]
 kzalloc include/linux/slab.h:733 [inline]
 fib6_net_init+0x1a6/0x800 net/ipv6/ip6_fib.c:2376
 ops_init+0x313/0x430 net/core/net_namespace.c:134
 setup_net+0x4bb/0xc10 net/core/net_namespace.c:325
 copy_net_ns+0x359/0x5b0 net/core/net_namespace.c:471
 create_new_namespaces+0x4db/0x8e0 kernel/nsproxy.c:110
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x1a55/0x3fc0 kernel/fork.c:2257
 kernel_clone+0x227/0x640 kernel/fork.c:2672
 __do_sys_clone3 kernel/fork.c:2964 [inline]
 __se_sys_clone3+0x372/0x410 kernel/fork.c:2948
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
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+0x812/0x900 mm/page_alloc.c:1499
 free_unref_page_prepare mm/page_alloc.c:3380 [inline]
 free_unref_page+0x7d/0x630 mm/page_alloc.c:3476
 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x2f/0xe0 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]
 slab_alloc mm/slub.c:3256 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3263 [inline]
 kmem_cache_alloc+0x1a6/0x310 mm/slub.c:3273
 vm_area_dup+0x23/0x1c0 kernel/fork.c:467
 dup_mmap+0x6a9/0xfc0 kernel/fork.c:641
 dup_mm+0x8c/0x310 kernel/fork.c:1524
 copy_mm+0x102/0x190 kernel/fork.c:1576
 copy_process+0x1973/0x3fc0 kernel/fork.c:2254
 kernel_clone+0x227/0x640 kernel/fork.c:2672
 __do_sys_clone3 kernel/fork.c:2964 [inline]
 __se_sys_clone3+0x372/0x410 kernel/fork.c:2948
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88807dccd480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807dccd500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807dccd580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff88807dccd600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807dccd680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================