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BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:796 [inline]
BUG: KASAN: use-after-free in enqueue_timer kernel/time/timer.c:541 [inline]
BUG: KASAN: use-after-free in __internal_add_timer+0x2a6/0x4a0 kernel/time/timer.c:554
Write of size 8 at addr ffff8881e802b1c8 by task kworker/0:36/7641

CPU: 0 PID: 7641 Comm: kworker/0:36 Not tainted 5.4.210-syzkaller-00033-g3ee2a37108c8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Workqueue: wg-crypt-wg0 wg_packet_tx_worker
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18e/0x1d5 lib/dump_stack.c:118
 print_address_description+0x8c/0x630 mm/kasan/report.c:384
 __kasan_report+0xf6/0x130 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 hlist_add_head include/linux/list.h:796 [inline]
 enqueue_timer kernel/time/timer.c:541 [inline]
 __internal_add_timer+0x2a6/0x4a0 kernel/time/timer.c:554
 internal_add_timer kernel/time/timer.c:604 [inline]
 __mod_timer+0x9ce/0x1a40 kernel/time/timer.c:1065
 mod_peer_timer drivers/net/wireguard/timers.c:37 [inline]
 wg_timers_any_authenticated_packet_traversal+0x125/0x180 drivers/net/wireguard/timers.c:215
 wg_packet_create_data_done drivers/net/wireguard/send.c:247 [inline]
 wg_packet_tx_worker+0x15d/0x4d0 drivers/net/wireguard/send.c:276
 process_one_work+0x6ca/0xc40 kernel/workqueue.c:2287
 worker_thread+0xae0/0x1440 kernel/workqueue.c:2433
 kthread+0x2d8/0x360 kernel/kthread.c:288
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the page:
page:ffffea0007a00ac0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 ffffea0007953108 ffffea0007a00a88 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x106dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_ZERO)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x194/0x380 mm/page_alloc.c:2171
 get_page_from_freelist+0x524/0x560 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x2ab/0x6f0 mm/page_alloc.c:4857
 __vmalloc_area_node mm/vmalloc.c:2431 [inline]
 __vmalloc_node_range+0x38f/0x730 mm/vmalloc.c:2499
 __vmalloc_node mm/vmalloc.c:2554 [inline]
 __vmalloc_node_flags_caller+0x78/0x90 mm/vmalloc.c:2576
 prealloc_init kernel/bpf/hashtab.c:142 [inline]
 htab_map_alloc+0x79a/0x11f0 kernel/bpf/hashtab.c:378
 find_and_alloc_map kernel/bpf/syscall.c:122 [inline]
 map_create kernel/bpf/syscall.c:573 [inline]
 __do_sys_bpf kernel/bpf/syscall.c:2871 [inline]
 __se_sys_bpf+0x301e/0xba40 kernel/bpf/syscall.c:2847
 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 free_pcp_prepare+0x1a4/0x290 mm/page_alloc.c:1233
 free_unref_page_prepare mm/page_alloc.c:3085 [inline]
 free_unref_page mm/page_alloc.c:3134 [inline]
 free_the_page mm/page_alloc.c:4917 [inline]
 __free_pages+0x52/0x1e0 mm/page_alloc.c:4925
 __vunmap+0x7d7/0x910 mm/vmalloc.c:2260
 htab_free_elems kernel/bpf/hashtab.c:116 [inline]
 prealloc_destroy kernel/bpf/hashtab.c:194 [inline]
 htab_map_free+0x5a2/0x6f0 kernel/bpf/hashtab.c:1231
 bpf_map_free_deferred+0xa6/0x100 kernel/bpf/syscall.c:311
 process_one_work+0x6ca/0xc40 kernel/workqueue.c:2287
 worker_thread+0xae0/0x1440 kernel/workqueue.c:2433
 kthread+0x2d8/0x360 kernel/kthread.c:288
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Memory state around the buggy address:
 ffff8881e802b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881e802b100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881e802b180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff8881e802b200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881e802b280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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