==================================================================
BUG: KASAN: slab-use-after-free in hlist_add_head include/linux/list.h:945 [inline]
BUG: KASAN: slab-use-after-free in enqueue_timer+0x4df/0x520 kernel/time/timer.c:605
Write of size 8 at addr ffff88806631d500 by task kworker/0:3/13953

CPU: 0 PID: 13953 Comm: kworker/0:3 Not tainted 6.3.0-syzkaller-07970-gbdeeed3498c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Workqueue: wg-crypt-wg1 wg_packet_decrypt_worker
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:319
 print_report mm/kasan/report.c:430 [inline]
 kasan_report+0x11c/0x130 mm/kasan/report.c:536
 hlist_add_head include/linux/list.h:945 [inline]
 enqueue_timer+0x4df/0x520 kernel/time/timer.c:605
 __mod_timer+0xb5d/0xe80 kernel/time/timer.c:1129
 mod_peer_timer+0x13f/0x2d0 drivers/net/wireguard/timers.c:37
 wg_timers_any_authenticated_packet_traversal+0x94/0xb0 drivers/net/wireguard/timers.c:215
 wg_packet_consume_data_done drivers/net/wireguard/receive.c:354 [inline]
 wg_packet_rx_poll+0x947/0x1f50 drivers/net/wireguard/receive.c:474
 __napi_poll+0xb7/0x6f0 net/core/dev.c:6496
 napi_poll net/core/dev.c:6563 [inline]
 net_rx_action+0x8a9/0xcb0 net/core/dev.c:6696
 __do_softirq+0x1d4/0x905 kernel/softirq.c:571
 do_softirq.part.0+0xde/0x130 kernel/softirq.c:472
 </IRQ>
 <TASK>
 do_softirq kernel/softirq.c:464 [inline]
 __local_bh_enable_ip+0x106/0x130 kernel/softirq.c:396
 spin_unlock_bh include/linux/spinlock.h:395 [inline]
 ptr_ring_consume_bh include/linux/ptr_ring.h:367 [inline]
 wg_packet_decrypt_worker+0x3dd/0x5c0 drivers/net/wireguard/receive.c:499
 process_one_work+0x991/0x15c0 kernel/workqueue.c:2390
 worker_thread+0x669/0x1090 kernel/workqueue.c:2537
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

Allocated by task 13319:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 ____kasan_kmalloc mm/kasan/common.c:333 [inline]
 __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:196 [inline]
 __do_kmalloc_node mm/slab_common.c:966 [inline]
 __kmalloc_node+0x61/0x1a0 mm/slab_common.c:973
 kmalloc_node include/linux/slab.h:580 [inline]
 kvmalloc_node+0x76/0x1a0 mm/util.c:603
 kvmalloc include/linux/slab.h:698 [inline]
 kvzalloc include/linux/slab.h:706 [inline]
 alloc_netdev_mqs+0x9c/0x1250 net/core/dev.c:10626
 rtnl_create_link+0xbeb/0xee0 net/core/rtnetlink.c:3315
 rtnl_newlink_create net/core/rtnetlink.c:3433 [inline]
 __rtnl_newlink+0xfd4/0x1840 net/core/rtnetlink.c:3660
 rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3673
 rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6395
 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546
 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
 netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365
 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg+0xde/0x190 net/socket.c:747
 __sys_sendto+0x23a/0x340 net/socket.c:2144
 __do_sys_sendto net/socket.c:2156 [inline]
 __se_sys_sendto net/socket.c:2152 [inline]
 __x64_sys_sendto+0xe1/0x1b0 net/socket.c:2152
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 6776:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:162 [inline]
 slab_free_hook mm/slub.c:1781 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
 slab_free mm/slub.c:3787 [inline]
 __kmem_cache_free+0xaf/0x2d0 mm/slub.c:3800
 kvfree+0x46/0x50 mm/util.c:649
 device_release+0xa3/0x240 drivers/base/core.c:2436
 kobject_cleanup lib/kobject.c:681 [inline]
 kobject_release lib/kobject.c:712 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1c2/0x4d0 lib/kobject.c:729
 netdev_run_todo+0x762/0x1100 net/core/dev.c:10400
 default_device_exit_batch+0x456/0x5b0 net/core/dev.c:11392
 ops_exit_list+0x125/0x170 net/core/net_namespace.c:175
 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:614
 process_one_work+0x991/0x15c0 kernel/workqueue.c:2390
 worker_thread+0x669/0x1090 kernel/workqueue.c:2537
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Last potentially related work creation:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:491
 insert_work+0x48/0x350 kernel/workqueue.c:1361
 __queue_work+0x625/0x1120 kernel/workqueue.c:1524
 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700
 expire_timers+0xbc/0x4b0 kernel/time/timer.c:1746
 __run_timers kernel/time/timer.c:2022 [inline]
 __run_timers kernel/time/timer.c:1995 [inline]
 run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035
 __do_softirq+0x1d4/0x905 kernel/softirq.c:571

Second to last potentially related work creation:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:491
 insert_work+0x48/0x350 kernel/workqueue.c:1361
 __queue_work+0x625/0x1120 kernel/workqueue.c:1524
 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700
 expire_timers+0xbc/0x4b0 kernel/time/timer.c:1746
 __run_timers kernel/time/timer.c:2022 [inline]
 __run_timers kernel/time/timer.c:1995 [inline]
 run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035
 __do_softirq+0x1d4/0x905 kernel/softirq.c:571

The buggy address belongs to the object at ffff88806631c000
 which belongs to the cache kmalloc-cg-8k of size 8192
The buggy address is located 5376 bytes inside of
 freed 8192-byte region [ffff88806631c000, ffff88806631e000)

The buggy address belongs to the physical page:
page:ffffea000198c600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x66318
head:ffffea000198c600 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888027e1e701
anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff88801244f640 ffffea0001f91e00 dead000000000005
raw: 0000000000000000 0000000000020002 00000001ffffffff ffff888027e1e701
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d60c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 6776, tgid 6776 (kworker/u4:8), ts 822441728247, free_ts 797574738251
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2db/0x350 mm/page_alloc.c:2546
 prep_new_page mm/page_alloc.c:2553 [inline]
 get_page_from_freelist+0x1190/0x2e20 mm/page_alloc.c:4326
 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:5592
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2277
 alloc_slab_page mm/slub.c:1851 [inline]
 allocate_slab+0x25f/0x390 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3193
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292
 __slab_alloc_node mm/slub.c:3345 [inline]
 slab_alloc_node mm/slub.c:3442 [inline]
 __kmem_cache_alloc_node+0x136/0x320 mm/slub.c:3491
 __do_kmalloc_node mm/slab_common.c:965 [inline]
 __kmalloc_node+0x51/0x1a0 mm/slab_common.c:973
 kmalloc_node include/linux/slab.h:580 [inline]
 kvmalloc_node+0x76/0x1a0 mm/util.c:603
 kvmalloc include/linux/slab.h:698 [inline]
 kvzalloc include/linux/slab.h:706 [inline]
 alloc_netdev_mqs+0x9c/0x1250 net/core/dev.c:10626
 nsim_create+0x95/0x5c0 drivers/net/netdevsim/netdev.c:342
 __nsim_dev_port_add+0x2de/0x8a0 drivers/net/netdevsim/dev.c:1393
 nsim_dev_port_add_all drivers/net/netdevsim/dev.c:1449 [inline]
 nsim_dev_reload_create drivers/net/netdevsim/dev.c:1501 [inline]
 nsim_dev_reload_up+0x597/0x830 drivers/net/netdevsim/dev.c:988
 devlink_reload+0x243/0x460 net/devlink/dev.c:373
 devlink_pernet_pre_exit+0x1b6/0x280 net/devlink/core.c:291
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1454 [inline]
 free_pcp_prepare+0x5da/0xa60 mm/page_alloc.c:1504
 free_unref_page_prepare mm/page_alloc.c:3388 [inline]
 free_unref_page+0x1d/0x490 mm/page_alloc.c:3483
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:710 [inline]
 slab_alloc_node mm/slub.c:3452 [inline]
 slab_alloc mm/slub.c:3460 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3467 [inline]
 kmem_cache_alloc+0x17c/0x3b0 mm/slub.c:3476
 kmem_cache_zalloc include/linux/slab.h:671 [inline]
 alloc_buffer_head+0x24/0x150 fs/buffer.c:2943
 alloc_page_buffers+0x284/0x790 fs/buffer.c:871
 create_empty_buffers+0x30/0xf30 fs/buffer.c:1585
 ext4_write_begin+0xcee/0x1020 fs/ext4/inode.c:1172
 ext4_da_write_begin+0x223/0x8b0 fs/ext4/inode.c:2891
 generic_perform_write+0x256/0x570 mm/filemap.c:3926
 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289
 ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710
 __kernel_write_iter+0x262/0x7a0 fs/read_write.c:517

Memory state around the buggy address:
 ffff88806631d400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88806631d480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88806631d500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88806631d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88806631d600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================