==================================================================
BUG: KASAN: slab-use-after-free in lockdep_register_key+0x253/0x3f0 kernel/locking/lockdep.c:1225
Read of size 8 at addr ffff888061418298 by task syz-executor.3/9817

CPU: 0 PID: 9817 Comm: syz-executor.3 Not tainted 6.9.0-rc5-syzkaller-01459-gc2e6a872bde9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 lockdep_register_key+0x253/0x3f0 kernel/locking/lockdep.c:1225
 htab_map_alloc+0x9b/0xe60 kernel/bpf/hashtab.c:506
 map_create+0x90c/0x1200 kernel/bpf/syscall.c:1333
 __sys_bpf+0x6d1/0x810 kernel/bpf/syscall.c:5659
 __do_sys_bpf kernel/bpf/syscall.c:5784 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5782 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5782
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2b227dea9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe2b1dff0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fe2b23abf80 RCX: 00007fe2b227dea9
RDX: 0000000000000048 RSI: 0000000020000100 RDI: 0000000000000000
RBP: 00007fe2b22ca4a4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fe2b23abf80 R15: 00007ffcf5e2cd88
 </TASK>

Allocated by task 9477:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:3966 [inline]
 __kmalloc_node_track_caller+0x24e/0x4e0 mm/slub.c:3986
 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:597
 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:666
 alloc_skb include/linux/skbuff.h:1308 [inline]
 _sctp_make_chunk+0x58/0x460 net/sctp/sm_make_chunk.c:1443
 sctp_make_data net/sctp/sm_make_chunk.c:1475 [inline]
 sctp_make_datafrag_empty+0xa6/0x510 net/sctp/sm_make_chunk.c:740
 sctp_datamsg_from_user+0x740/0xf20 net/sctp/chunk.c:262
 sctp_sendmsg_to_asoc+0xf7e/0x1800 net/sctp/socket.c:1859
 sctp_sendmsg+0x1bc3/0x3520 net/sctp/socket.c:2031
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x1a6/0x270 net/socket.c:745
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191
 __do_sys_sendto net/socket.c:2203 [inline]
 __se_sys_sendto net/socket.c:2199 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2199
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 9477:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240
 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2106 [inline]
 slab_free mm/slub.c:4280 [inline]
 kfree+0x153/0x3a0 mm/slub.c:4390
 skb_kfree_head net/core/skbuff.c:1033 [inline]
 skb_free_head net/core/skbuff.c:1045 [inline]
 skb_release_data+0x676/0x880 net/core/skbuff.c:1072
 skb_release_all net/core/skbuff.c:1137 [inline]
 __kfree_skb net/core/skbuff.c:1151 [inline]
 consume_skb+0xb1/0x160 net/core/skbuff.c:1373
 sctp_chunk_destroy net/sctp/sm_make_chunk.c:1503 [inline]
 sctp_chunk_put+0x17a/0x200 net/sctp/sm_make_chunk.c:1530
 sctp_datamsg_put+0x42b/0x560 net/sctp/chunk.c:128
 sctp_chunk_free+0x4a/0x60 net/sctp/sm_make_chunk.c:1515
 __sctp_outq_teardown+0x7c6/0x9b0 net/sctp/outqueue.c:257
 sctp_association_free+0x21a/0x7b0 net/sctp/associola.c:339
 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:944 [inline]
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1330 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline]
 sctp_do_sm+0x4393/0x60c0 net/sctp/sm_sideeffect.c:1169
 sctp_primitive_SHUTDOWN+0x98/0xc0 net/sctp/primitive.c:89
 sctp_close+0x3cd/0x920 net/sctp/socket.c:1528
 inet_release+0x17d/0x200 net/ipv4/af_inet.c:437
 __sock_release net/socket.c:659 [inline]
 sock_close+0xbc/0x240 net/socket.c:1421
 __fput+0x429/0x8a0 fs/file_table.c:422
 task_work_run+0x24f/0x310 kernel/task_work.c:180
 get_signal+0x15e6/0x1740 kernel/signal.c:2683
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
 do_syscall_64+0x102/0x240 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888061418000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 664 bytes inside of
 freed 2048-byte region [ffff888061418000, ffff888061418800)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88806141d000 pfn:0x61418
head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff80000000a40(workingset|slab|head|node=0|zone=1|lastcpupid=0xfff)
page_type: 0xffffffff()
raw: 00fff80000000a40 ffff888015042000 ffffea0001f65810 ffffea0001f98610
raw: ffff88806141d000 0000000000080002 00000001ffffffff 0000000000000000
head: 00fff80000000a40 ffff888015042000 ffffea0001f65810 ffffea0001f98610
head: ffff88806141d000 0000000000080002 00000001ffffffff 0000000000000000
head: 00fff80000000003 ffffea0001850601 dead000000000122 00000000ffffffff
head: 0000000800000000 0000000000000000 00000000ffffffff 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 5106, tgid -1543346749 (syz-executor.1), ts 5106, free_ts 23731604295
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534
 prep_new_page mm/page_alloc.c:1541 [inline]
 get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317
 __alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page+0x5f/0x160 mm/slub.c:2175
 allocate_slab mm/slub.c:2338 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2391
 ___slab_alloc+0xc73/0x1260 mm/slub.c:3525
 __slab_alloc mm/slub.c:3610 [inline]
 __slab_alloc_node mm/slub.c:3663 [inline]
 slab_alloc_node mm/slub.c:3835 [inline]
 __do_kmalloc_node mm/slub.c:3965 [inline]
 __kmalloc+0x2e5/0x4a0 mm/slub.c:3979
 kmalloc_array include/linux/slab.h:665 [inline]
 kcalloc include/linux/slab.h:696 [inline]
 cache_create_net+0x83/0x270 net/sunrpc/cache.c:1749
 nfsd_idmap_init+0x58/0x1e0 fs/nfsd/nfs4idmap.c:470
 nfsd_net_init+0x4b/0x1d0 fs/nfsd/nfsctl.c:1672
 ops_init+0x352/0x610 net/core/net_namespace.c:136
 setup_net+0x515/0xca0 net/core/net_namespace.c:340
 copy_net_ns+0x4e4/0x7b0 net/core/net_namespace.c:505
 create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
 ksys_unshare+0x619/0xc10 kernel/fork.c:3323
page last free pid 1 tgid 1 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1141 [inline]
 free_unref_page_prepare+0x986/0xab0 mm/page_alloc.c:2347
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487
 free_contig_range+0x9e/0x160 mm/page_alloc.c:6572
 destroy_args+0x8a/0x890 mm/debug_vm_pgtable.c:1036
 debug_vm_pgtable+0x4be/0x550 mm/debug_vm_pgtable.c:1416
 do_one_initcall+0x248/0x880 init/main.c:1245
 do_initcall_level+0x157/0x210 init/main.c:1307
 do_initcalls+0x3f/0x80 init/main.c:1323
 kernel_init_freeable+0x435/0x5d0 init/main.c:1555
 kernel_init+0x1d/0x2b0 init/main.c:1444
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Memory state around the buggy address:
 ffff888061418180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888061418200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888061418280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888061418300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888061418380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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