================================================================== BUG: KASAN: invalid-access in hlist_add_head include/linux/list.h:883 [inline] BUG: KASAN: invalid-access in enqueue_timer+0x18/0xc0 kernel/time/timer.c:581 Write at addr fdff000026b24da0 by task kworker/1:0/19 Pointer tag: [fd], memory tag: [f7] CPU: 1 PID: 19 Comm: kworker/1:0 Not tainted 5.11.0-syzkaller #0 Hardware name: linux,dummy-virt (DT) Workqueue: wg-crypt-wg1 wg_packet_decrypt_worker Call trace: dump_backtrace+0x0/0x1b0 arch/arm64/kernel/stacktrace.c:117 show_stack+0x18/0x70 arch/arm64/kernel/stacktrace.c:196 __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xd0/0x12c lib/dump_stack.c:120 print_address_description+0x70/0x29c mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report+0x134/0x380 mm/kasan/report.c:413 report_tag_fault arch/arm64/mm/fault.c:311 [inline] do_tag_recovery arch/arm64/mm/fault.c:325 [inline] __do_kernel_fault+0x178/0x1bc arch/arm64/mm/fault.c:369 do_bad_area arch/arm64/mm/fault.c:462 [inline] do_tag_check_fault+0x74/0x90 arch/arm64/mm/fault.c:717 do_mem_abort+0x44/0xbc arch/arm64/mm/fault.c:793 el1_abort+0x40/0x6c arch/arm64/kernel/entry-common.c:118 el1_sync_handler+0xac/0xd0 arch/arm64/kernel/entry-common.c:209 el1_sync+0x70/0x100 arch/arm64/kernel/entry.S:656 hlist_add_head include/linux/list.h:883 [inline] enqueue_timer+0x18/0xc0 kernel/time/timer.c:581 mod_timer+0x14/0x20 kernel/time/timer.c:1106 mod_peer_timer drivers/net/wireguard/timers.c:37 [inline] wg_timers_any_authenticated_packet_traversal+0x68/0x90 drivers/net/wireguard/timers.c:215 wg_packet_consume_data_done drivers/net/wireguard/receive.c:360 [inline] wg_packet_rx_poll+0x334/0x6a0 drivers/net/wireguard/receive.c:482 napi_poll net/core/dev.c:6806 [inline] net_rx_action+0x178/0x484 net/core/dev.c:6889 _stext+0x124/0x2ac do_softirq_own_stack include/linux/interrupt.h:577 [inline] do_softirq kernel/softirq.c:246 [inline] do_softirq+0x98/0xa4 kernel/softirq.c:233 __local_bh_enable_ip+0xa4/0xb0 kernel/softirq.c:196 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0x38/0x60 kernel/locking/spinlock.c:207 spin_unlock_bh include/linux/spinlock.h:399 [inline] ptr_ring_consume_bh include/linux/ptr_ring.h:367 [inline] wg_packet_decrypt_worker+0xf8/0x1c0 drivers/net/wireguard/receive.c:507 process_one_work+0x1d8/0x360 kernel/workqueue.c:2275 worker_thread+0x70/0x434 kernel/workqueue.c:2421 kthread+0x174/0x180 kernel/kthread.c:292 ret_from_fork+0x10/0x34 arch/arm64/kernel/entry.S:958 Allocated by task 6021: stack_trace_save+0x50/0x80 kernel/stacktrace.c:121 kasan_save_stack+0x28/0x60 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc+0xe8/0x160 mm/kasan/common.c:429 __kasan_kmalloc+0x14/0x20 mm/kasan/common.c:443 kasan_kmalloc include/linux/kasan.h:219 [inline] kmem_cache_alloc_trace include/linux/slab.h:450 [inline] kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:682 [inline] snmp6_alloc_dev net/ipv6/addrconf.c:349 [inline] ipv6_add_dev+0x1d4/0x4e0 net/ipv6/addrconf.c:398 addrconf_notify+0x250/0x94c net/ipv6/addrconf.c:3489 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x54/0x74 kernel/notifier.c:410 call_netdevice_notifiers_info+0x58/0xa4 net/core/dev.c:2040 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] register_netdevice+0x450/0x59c net/core/dev.c:10089 __ip_tunnel_create+0xe0/0x1fc net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0xd0/0x194 net/ipv4/ip_tunnel.c:1061 erspan_init_net+0x2c/0x40 net/ipv4/ip_gre.c:1692 ops_init+0x40/0x160 net/core/net_namespace.c:152 setup_net+0xbc/0x240 net/core/net_namespace.c:342 copy_net_ns+0x120/0x5f0 net/core/net_namespace.c:483 create_new_namespaces+0x114/0x330 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x64/0xb0 kernel/nsproxy.c:226 ksys_unshare+0x1ac/0x304 kernel/fork.c:2955 __do_sys_unshare kernel/fork.c:3023 [inline] __se_sys_unshare kernel/fork.c:3021 [inline] __arm64_sys_unshare+0x14/0x2c kernel/fork.c:3021 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall arch/arm64/kernel/syscall.c:49 [inline] el0_svc_common.constprop.0+0x74/0x190 arch/arm64/kernel/syscall.c:159 do_el0_svc+0x74/0x90 arch/arm64/kernel/syscall.c:198 el0_svc+0x14/0x20 arch/arm64/kernel/entry-common.c:365 el0_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:381 el0_sync+0x190/0x1c0 arch/arm64/kernel/entry.S:699 Freed by task 6036: stack_trace_save+0x50/0x80 kernel/stacktrace.c:121 kasan_save_stack+0x28/0x60 mm/kasan/common.c:38 kasan_set_track+0x28/0x40 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/hw_tags.c:174 ____kasan_slab_free.constprop.0+0x184/0x1c0 mm/kasan/common.c:362 __kasan_slab_free+0x10/0x20 mm/kasan/common.c:369 kasan_slab_free include/linux/kasan.h:192 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x98/0x18c mm/slub.c:1580 slab_free mm/slub.c:3143 [inline] kfree+0x324/0x4a0 mm/slub.c:4139 cleanup_uevent_env+0x14/0x20 lib/kobject_uevent.c:273 call_usermodehelper_freeinfo kernel/umh.c:44 [inline] umh_complete+0x54/0x70 kernel/umh.c:59 call_usermodehelper_exec_async+0x134/0x140 kernel/umh.c:120 ret_from_fork+0x10/0x34 arch/arm64/kernel/entry.S:958 The buggy address belongs to the object at ffff000026b24000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3488 bytes inside of 4096-byte region [ffff000026b24000, ffff000026b25000) The buggy address belongs to the page: page:00000000e32a4922 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x66b20 head:00000000e32a4922 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x1ffffc000010200(slab|head) raw: 01ffffc000010200 0000000000000000 0000000100000001 f8ff000004801900 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff000026b24b00: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 ffff000026b24c00: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 >ffff000026b24d00: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 ^ ffff000026b24e00: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 ffff000026b24f00: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 ==================================================================