==================================================================
BUG: KASAN: double-free in slab_free mm/slub.c:3539 [inline]
BUG: KASAN: double-free in kfree+0xe2/0x580 mm/slub.c:4567

CPU: 1 PID: 3707 Comm: kworker/1:7 Not tainted 6.0.0-syzkaller-02761-gb15e2e49bfc4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Workqueue: events mptcp_worker
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_invalid_free+0x81/0x190 mm/kasan/report.c:462
 ____kasan_slab_free+0x18b/0x1c0 mm/kasan/common.c:356
 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
 tcp_disconnect+0x980/0x1e20 net/ipv4/tcp.c:3145
 __mptcp_close_ssk+0x5ca/0x7e0 net/mptcp/protocol.c:2327
 mptcp_do_fastclose net/mptcp/protocol.c:2592 [inline]
 mptcp_worker+0x78c/0xff0 net/mptcp/protocol.c:2627
 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 10519:
 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 include/linux/slab.h:605 [inline]
 kzalloc include/linux/slab.h:733 [inline]
 tomoyo_encode2.part.0+0xe9/0x3a0 security/tomoyo/realpath.c:45
 tomoyo_encode2 security/tomoyo/realpath.c:31 [inline]
 tomoyo_encode+0x28/0x50 security/tomoyo/realpath.c:80
 tomoyo_path_perm+0x368/0x400 security/tomoyo/file.c:831
 tomoyo_path_symlink+0x94/0xe0 security/tomoyo/tomoyo.c:199
 security_path_symlink+0xdf/0x150 security/security.c:1182
 do_symlinkat+0x106/0x2e0 fs/namei.c:4402
 __do_sys_symlinkat fs/namei.c:4424 [inline]
 __se_sys_symlinkat fs/namei.c:4421 [inline]
 __x64_sys_symlinkat+0x93/0xc0 fs/namei.c:4421
 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 10519:
 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
 tomoyo_path_perm+0x3b0/0x400 security/tomoyo/file.c:840
 tomoyo_path_symlink+0x94/0xe0 security/tomoyo/tomoyo.c:199
 security_path_symlink+0xdf/0x150 security/security.c:1182
 do_symlinkat+0x106/0x2e0 fs/namei.c:4402
 __do_sys_symlinkat fs/namei.c:4424 [inline]
 __se_sys_symlinkat fs/namei.c:4421 [inline]
 __x64_sys_symlinkat+0x93/0xc0 fs/namei.c:4421
 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 ffff888076a19b80
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes inside of
 64-byte region [ffff888076a19b80, ffff888076a19bc0)

The buggy address belongs to the physical page:
page:ffffea0001da8640 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76a19
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0000866700 dead000000000003 ffff888011841640
raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 9, tgid 9 (kworker/u4:0), ts 124996160701, free_ts 124954142093
 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]
 kmem_cache_alloc_node_trace+0x185/0x410 mm/slub.c:3312
 kmalloc_node include/linux/slab.h:618 [inline]
 kzalloc_node include/linux/slab.h:744 [inline]
 __get_vm_area_node+0xed/0x3f0 mm/vmalloc.c:2477
 __vmalloc_node_range+0x250/0x13a0 mm/vmalloc.c:3156
 alloc_thread_stack_node kernel/fork.c:312 [inline]
 dup_task_struct kernel/fork.c:977 [inline]
 copy_process+0x156c/0x7090 kernel/fork.c:2085
 kernel_clone+0xe7/0xab0 kernel/fork.c:2671
 user_mode_thread+0xad/0xe0 kernel/fork.c:2740
 call_usermodehelper_exec_sync kernel/umh.c:135 [inline]
 call_usermodehelper_exec_work+0x69/0x180 kernel/umh.c:166
 process_one_work+0x991/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
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]
 kmem_cache_alloc_node+0x2b1/0x3f0 mm/slub.c:3298
 __alloc_skb+0x210/0x2f0 net/core/skbuff.c:497
 alloc_skb include/linux/skbuff.h:1265 [inline]
 alloc_skb_with_frags+0x93/0x6c0 net/core/skbuff.c:6124
 sock_alloc_send_pskb+0x7a3/0x930 net/core/sock.c:2719
 sock_alloc_send_skb include/net/sock.h:1884 [inline]
 mld_newpack.isra.0+0x1b9/0x770 net/ipv6/mcast.c:1748
 add_grhead+0x295/0x340 net/ipv6/mcast.c:1851
 add_grec+0x1082/0x1560 net/ipv6/mcast.c:1989
 mld_send_cr net/ipv6/mcast.c:2115 [inline]
 mld_ifc_work+0x452/0xdc0 net/ipv6/mcast.c:2653
 process_one_work+0x991/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376

Memory state around the buggy address:
 ffff888076a19a80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888076a19b00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff888076a19b80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                   ^
 ffff888076a19c00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff888076a19c80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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