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BUG: KASAN: slab-out-of-bounds in hlist_empty include/linux/list.h:972 [inline]
BUG: KASAN: slab-out-of-bounds in cache_clean+0x8bd/0x9a0 net/sunrpc/cache.c:471
Read of size 8 at addr ffff88806b3c0800 by task kworker/3:3/5981

CPU: 3 UID: 0 PID: 5981 Comm: kworker/3:3 Not tainted 6.15.0-syzkaller-10954-gd00a83477e7a #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: events_power_efficient do_cache_clean
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xcd/0x680 mm/kasan/report.c:521
 kasan_report+0xe0/0x110 mm/kasan/report.c:634
 hlist_empty include/linux/list.h:972 [inline]
 cache_clean+0x8bd/0x9a0 net/sunrpc/cache.c:471
 do_cache_clean net/sunrpc/cache.c:520 [inline]
 do_cache_clean+0x29/0xa0 net/sunrpc/cache.c:513
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 9006:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4327 [inline]
 __kmalloc_noprof+0x223/0x510 mm/slub.c:4339
 kmalloc_noprof include/linux/slab.h:909 [inline]
 kmalloc_array_noprof include/linux/slab.h:948 [inline]
 cache_create_net+0x9d/0x220 net/sunrpc/cache.c:1747
 unix_gid_cache_create+0x60/0x130 net/sunrpc/svcauth_unix.c:606
 sunrpc_init_net+0x71/0x190 net/sunrpc/sunrpc_syms.c:46
 ops_init+0x1e2/0x5f0 net/core/net_namespace.c:138
 setup_net+0x1ff/0x510 net/core/net_namespace.c:442
 copy_net_ns+0x2a6/0x5f0 net/core/net_namespace.c:574
 create_new_namespaces+0x3ea/0xa90 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:218
 ksys_unshare+0x45b/0xa40 kernel/fork.c:3121
 __do_sys_unshare kernel/fork.c:3192 [inline]
 __se_sys_unshare kernel/fork.c:3190 [inline]
 __ia32_sys_unshare+0x30/0x40 kernel/fork.c:3190
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

The buggy address belongs to the object at ffff88806b3c0000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 0 bytes to the right of
 allocated 2048-byte region [ffff88806b3c0000, ffff88806b3c0800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88806b3c1000 pfn:0x6b3c0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x4fff00000000240(workingset|head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000240 ffff88801b442f00 ffffea000130d810 ffff888040400948
raw: ffff88806b3c1000 0000000000080005 00000000f5000000 0000000000000000
head: 04fff00000000240 ffff88801b442f00 ffffea000130d810 ffff888040400948
head: ffff88806b3c1000 0000000000080005 00000000f5000000 0000000000000000
head: 04fff00000000003 ffffea0001acf001 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5940, tgid 5940 (syz-executor), ts 45846546709, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
 prep_new_page mm/page_alloc.c:1712 [inline]
 get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419
 alloc_slab_page mm/slub.c:2450 [inline]
 allocate_slab mm/slub.c:2618 [inline]
 new_slab+0x23b/0x330 mm/slub.c:2672
 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3858
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948
 __slab_alloc_node mm/slub.c:4023 [inline]
 slab_alloc_node mm/slub.c:4184 [inline]
 __do_kmalloc_node mm/slub.c:4326 [inline]
 __kmalloc_node_track_caller_noprof+0x2ee/0x510 mm/slub.c:4346
 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:601
 pskb_expand_head+0x238/0x1030 net/core/skbuff.c:2241
 netlink_trim+0x22d/0x310 net/netlink/af_netlink.c:1295
 netlink_broadcast_filtered+0xca/0xf10 net/netlink/af_netlink.c:1501
 nlmsg_multicast_filtered include/net/netlink.h:1151 [inline]
 nlmsg_multicast include/net/netlink.h:1170 [inline]
 nlmsg_notify+0x9e/0x220 net/netlink/af_netlink.c:2577
 rtnl_notify net/core/rtnetlink.c:958 [inline]
 rtmsg_ifinfo_send net/core/rtnetlink.c:4419 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:4435 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:4422 [inline]
 rtmsg_ifinfo+0x174/0x1a0 net/core/rtnetlink.c:4441
 __dev_notify_flags+0x24c/0x2e0 net/core/dev.c:9493
 rtnl_configure_link+0x1b5/0x280 net/core/rtnetlink.c:3589
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88806b3c0700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88806b3c0780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88806b3c0800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88806b3c0880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88806b3c0900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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