==================================================================
BUG: KASAN: use-after-free in __list_add_valid+0xa5/0xb0 lib/list_debug.c:30
Read of size 8 at addr ffff888077b4f5c8 by task syz-executor.2/3868

CPU: 1 PID: 3868 Comm: syz-executor.2 Not tainted 6.0.0-rc6-next-20220921-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2022
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:284 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:395
 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495
 __list_add_valid+0xa5/0xb0 lib/list_debug.c:30
 __list_add include/linux/list.h:69 [inline]
 list_add_tail include/linux/list.h:102 [inline]
 register_shrinker_prepared mm/vmscan.c:695 [inline]
 __register_shrinker mm/vmscan.c:707 [inline]
 register_shrinker+0x6f/0x160 mm/vmscan.c:733
 nfsd4_init_leases_net+0x390/0x490 fs/nfsd/nfs4state.c:4400
 nfsd_init_net+0x1b5/0x430 fs/nfsd/nfsctl.c:1484
 ops_init+0xaf/0x470 net/core/net_namespace.c:135
 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326
 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178
 copy_process+0x306e/0x71b0 kernel/fork.c:2259
 kernel_clone+0xe7/0x980 kernel/fork.c:2676
 __do_sys_clone3+0x1cd/0x2e0 kernel/fork.c:2975
 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
RIP: 0033:0x7f65c128a649
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:00007f65c2389038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007f65c139c1f0 RCX: 00007f65c128a649
RDX: 0000000000000000 RSI: 0000000000000058 RDI: 00007f65c2389050
RBP: 00007f65c12e5560 R08: 0000000000000000 R09: 0000000000000058
R10: 00007f65c2389050 R11: 0000000000000246 R12: 0000000000000058
R13: 00007ffca23e5c8f R14: 00007f65c2389300 R15: 0000000000022000
 </TASK>

Allocated by task 3857:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 kasan_set_track+0x21/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:371 [inline]
 ____kasan_kmalloc mm/kasan/common.c:330 [inline]
 __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:934 [inline]
 __kmalloc+0x54/0xc0 mm/slab_common.c:947
 kmalloc include/linux/slab.h:564 [inline]
 kzalloc include/linux/slab.h:695 [inline]
 ops_init+0xfb/0x470 net/core/net_namespace.c:125
 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326
 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178
 copy_process+0x306e/0x71b0 kernel/fork.c:2259
 kernel_clone+0xe7/0x980 kernel/fork.c:2676
 __do_sys_clone3+0x1cd/0x2e0 kernel/fork.c:2975
 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 3857:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 kasan_set_track+0x21/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1669 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695
 slab_free mm/slub.c:3599 [inline]
 __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612
 ops_init+0xcd/0x470 net/core/net_namespace.c:140
 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326
 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178
 copy_process+0x306e/0x71b0 kernel/fork.c:2259
 kernel_clone+0xe7/0x980 kernel/fork.c:2676
 __do_sys_clone3+0x1cd/0x2e0 kernel/fork.c:2975
 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 ffff888077b4f000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1480 bytes inside of
 2048-byte region [ffff888077b4f000, ffff888077b4f800)

The buggy address belongs to the physical page:
page:ffffea0001ded200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x77b48
head:ffffea0001ded200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888011842000 dead000000080008 0000000000000000
raw: 0000000000000000 dead000000000001 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 3656, tgid 3656 (syz-executor.5), ts 446452503294, free_ts 446431158721
 prep_new_page mm/page_alloc.c:2538 [inline]
 get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4286
 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5545
 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280
 alloc_slab_page mm/slub.c:1739 [inline]
 allocate_slab+0x213/0x300 mm/slub.c:1884
 new_slab mm/slub.c:1937 [inline]
 ___slab_alloc+0xac1/0x1430 mm/slub.c:3119
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217
 slab_alloc_node mm/slub.c:3302 [inline]
 __kmem_cache_alloc_node+0x18a/0x3d0 mm/slub.c:3375
 __do_kmalloc_node mm/slab_common.c:933 [inline]
 __kmalloc+0x44/0xc0 mm/slab_common.c:947
 kmalloc include/linux/slab.h:564 [inline]
 kzalloc include/linux/slab.h:695 [inline]
 ops_init+0xfb/0x470 net/core/net_namespace.c:125
 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326
 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
 ksys_unshare+0x445/0x920 kernel/fork.c:3193
 __do_sys_unshare kernel/fork.c:3264 [inline]
 __se_sys_unshare kernel/fork.c:3262 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3262
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 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:1458 [inline]
 free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1508
 free_unref_page_prepare mm/page_alloc.c:3386 [inline]
 free_unref_page+0x19/0x4d0 mm/page_alloc.c:3482
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2532
 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+0x62/0x80 mm/kasan/common.c:302
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slab.h:754 [inline]
 slab_alloc_node mm/slub.c:3336 [inline]
 __kmem_cache_alloc_node+0x2d2/0x3d0 mm/slub.c:3375
 __do_kmalloc_node mm/slab_common.c:933 [inline]
 __kmalloc+0x44/0xc0 mm/slab_common.c:947
 kmalloc include/linux/slab.h:564 [inline]
 kzalloc include/linux/slab.h:695 [inline]
 ops_init+0xfb/0x470 net/core/net_namespace.c:125
 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326
 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
 ksys_unshare+0x445/0x920 kernel/fork.c:3193
 __do_sys_unshare kernel/fork.c:3264 [inline]
 __se_sys_unshare kernel/fork.c:3262 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3262
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80

Memory state around the buggy address:
 ffff888077b4f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888077b4f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888077b4f580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff888077b4f600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888077b4f680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================