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BUG: KASAN: stack-out-of-bounds in symbol_string+0xb6/0x3b0 lib/vsprintf.c:987
Write of size 666 at addr ffffc900047d68e0 by task syz.1.138/6109

CPU: 0 UID: 0 PID: 6109 Comm: syz.1.138 Not tainted 6.11.0-rc4-next-20240822-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 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
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 __asan_memset+0x23/0x50 mm/kasan/shadow.c:84
 symbol_string+0xb6/0x3b0 lib/vsprintf.c:987
 pointer+0x8cb/0x1210 lib/vsprintf.c:2422
 vsnprintf+0xdb0/0x1da0 lib/vsprintf.c:2828
 vscnprintf+0x42/0x90 lib/vsprintf.c:2930
 panic+0x245/0x880 kernel/panic.c:342
 rcu_is_watching_curr_cpu include/linux/context_tracking.h:126 [inline]
 rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:737
 </TASK>

The buggy address belongs to stack of task syz.1.138/6109
 and is located at offset 32 in frame:
 symbol_string+0x0/0x3b0

This frame has 1 object:
 [32, 698) 'sym'

The buggy address belongs to the virtual mapping at
 [ffffc900047d0000, ffffc900047d9000) created by:
 copy_process+0x5d1/0x3d50 kernel/fork.c:2203

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807c6fae58 pfn:0x7c6fa
memcg:ffff88802c823c82
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff88807c6fae58 0000000000000000 00000001ffffffff ffff88802c823c82
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 2, tgid 2 (kthreadd), ts 76679268783, free_ts 76362201289
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1517
 prep_new_page mm/page_alloc.c:1525 [inline]
 get_page_from_freelist+0x3131/0x3280 mm/page_alloc.c:3476
 __alloc_pages_noprof+0x29e/0x780 mm/page_alloc.c:4743
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 vm_area_alloc_pages mm/vmalloc.c:3600 [inline]
 __vmalloc_area_node mm/vmalloc.c:3669 [inline]
 __vmalloc_node_range_noprof+0xa40/0x1400 mm/vmalloc.c:3850
 alloc_thread_stack_node kernel/fork.c:314 [inline]
 dup_task_struct+0x444/0x8c0 kernel/fork.c:1115
 copy_process+0x5d1/0x3d50 kernel/fork.c:2203
 kernel_clone+0x226/0x8f0 kernel/fork.c:2784
 kernel_thread+0x1bc/0x240 kernel/fork.c:2846
 create_kthread kernel/kthread.c:412 [inline]
 kthreadd+0x60d/0x810 kernel/kthread.c:765
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
page last free pid 5315 tgid 5315 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1098 [inline]
 free_unref_page+0xc07/0xd90 mm/page_alloc.c:2651
 discard_slab mm/slub.c:2630 [inline]
 __put_partials+0xeb/0x130 mm/slub.c:3098
 put_cpu_partial+0x17c/0x250 mm/slub.c:3173
 __slab_free+0x2ea/0x3d0 mm/slub.c:4391
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4036 [inline]
 slab_alloc_node mm/slub.c:4085 [inline]
 kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4128
 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:667
 alloc_skb include/linux/skbuff.h:1320 [inline]
 alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6563
 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2815
 sock_alloc_send_skb include/net/sock.h:1778 [inline]
 mld_newpack+0x1c3/0xa90 net/ipv6/mcast.c:1746
 add_grhead net/ipv6/mcast.c:1849 [inline]
 add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1987
 mld_send_cr net/ipv6/mcast.c:2113 [inline]
 mld_ifc_work+0x691/0xd90 net/ipv6/mcast.c:2650
 process_one_work kernel/workqueue.c:3232 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3313
 worker_thread+0x86d/0xd10 kernel/workqueue.c:3390

Memory state around the buggy address:
 ffffc900047d6980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900047d6a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900047d6a80: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2
                                           ^
 ffffc900047d6b00: 00 00 00 f2 f2 f2 f2 f2 04 f3 f3 f3 00 00 00 02
 ffffc900047d6b80: f3 f3 f3 f3 f3 f3 f3 f3 f3 f3 f3 f3 f3 f3 f3 f3
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