===================================================== BUG: KMSAN: uninit-value in __hlist_del include/linux/list.h:812 [inline] BUG: KMSAN: uninit-value in detach_timer kernel/time/timer.c:814 [inline] BUG: KMSAN: uninit-value in expire_timers kernel/time/timer.c:1438 [inline] BUG: KMSAN: uninit-value in __run_timers+0xbd9/0x11c0 kernel/time/timer.c:1773 CPU: 0 PID: 334 Comm: kworker/u4:5 Not tainted 5.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1df/0x240 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 __hlist_del include/linux/list.h:812 [inline] detach_timer kernel/time/timer.c:814 [inline] expire_timers kernel/time/timer.c:1438 [inline] __run_timers+0xbd9/0x11c0 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x311/0x83d kernel/softirq.c:293 asm_call_on_stack+0x12/0x20 arch/x86/entry/entry_64.S:711 __run_on_irqstack arch/x86/include/asm/irq_stack.h:23 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline] do_softirq_own_stack+0x7c/0xa0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:390 [inline] __irq_exit_rcu+0x226/0x270 kernel/softirq.c:420 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x107/0x130 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:593 RIP: 0010:kmsan_get_metadata+0x16b/0x180 mm/kmsan/kmsan_shadow.c:203 Code: 48 2b 0d 60 92 a1 0d 48 c1 e9 04 48 b8 00 d0 cc cc cc cc cc cc 48 0f af c1 48 03 05 37 92 a1 0d 48 01 d8 eb 02 31 c0 5b 41 5e <41> 5f 5d c3 0f 0b 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 RSP: 0018:ffffae564156b6b8 EFLAGS: 00000282 RAX: ffff9d089f4ddadc RBX: ffff9d089fc0dadc RCX: 0000000000a9c851 RDX: 00000001b511aadc RSI: 00000000000006c0 RDI: ffffffff9311aadc RBP: ffffae564156b6c0 R08: ffffe1374000000f R09: ffff9d07afffb000 R10: 0000000000000004 R11: ffffffff8f1320a0 R12: ffffffff92a218b4 R13: 0000000000000000 R14: ffffffff9311aadc R15: 0000000000000000 kmsan_get_shadow_origin_ptr+0x81/0xb0 mm/kmsan/kmsan_shadow.c:154 __msan_metadata_ptr_for_load_4+0x10/0x20 mm/kmsan/kmsan_instr.c:54 get_next_corpse net/netfilter/nf_conntrack_core.c:2213 [inline] nf_ct_iterate_cleanup+0x5db/0x710 net/netfilter/nf_conntrack_core.c:2261 nf_ct_iterate_cleanup_net+0x182/0x230 net/netfilter/nf_conntrack_core.c:2346 masq_device_event+0x10c/0x180 net/netfilter/nf_nat_masquerade.c:88 notifier_call_chain kernel/notifier.c:83 [inline] __raw_notifier_call_chain kernel/notifier.c:361 [inline] raw_notifier_call_chain+0x130/0x250 kernel/notifier.c:368 call_netdevice_notifiers_info net/core/dev.c:2027 [inline] call_netdevice_notifiers_extack net/core/dev.c:2039 [inline] call_netdevice_notifiers net/core/dev.c:2053 [inline] dev_close_many+0x673/0xaf0 net/core/dev.c:1628 rollback_registered_many+0x8ae/0x25e0 net/core/dev.c:8945 unregister_netdevice_many net/core/dev.c:10113 [inline] default_device_exit_batch+0x73b/0xc60 net/core/dev.c:10596 ops_exit_list net/core/net_namespace.c:189 [inline] cleanup_net+0xf37/0x1a70 net/core/net_namespace.c:603 process_one_work+0x1540/0x1f30 kernel/workqueue.c:2269 worker_thread+0xed2/0x23f0 kernel/workqueue.c:2415 kthread+0x515/0x550 kernel/kthread.c:292 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:293 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80 slab_alloc_node mm/slub.c:2839 [inline] slab_alloc mm/slub.c:2848 [inline] __kmalloc_track_caller+0x8ce/0xef0 mm/slub.c:4447 kmemdup+0x95/0x140 mm/util.c:127 __addrconf_sysctl_register+0xe1/0x7d0 net/ipv6/addrconf.c:6882 addrconf_sysctl_register+0x2c7/0x370 net/ipv6/addrconf.c:6947 ipv6_add_dev+0x1554/0x18e0 net/ipv6/addrconf.c:443 addrconf_notify+0xc0a/0x5ae0 net/ipv6/addrconf.c:3462 notifier_call_chain kernel/notifier.c:83 [inline] __raw_notifier_call_chain kernel/notifier.c:361 [inline] raw_notifier_call_chain+0x130/0x250 kernel/notifier.c:368 call_netdevice_notifiers_info net/core/dev.c:2027 [inline] call_netdevice_notifiers_extack net/core/dev.c:2039 [inline] call_netdevice_notifiers net/core/dev.c:2053 [inline] register_netdevice+0x2c5d/0x3290 net/core/dev.c:9545 register_netdev+0x93/0xd0 net/core/dev.c:9645 sit_init_net+0x3a2/0xa90 net/ipv6/sit.c:1916 ops_init+0x2d3/0x730 net/core/net_namespace.c:151 setup_net+0x286/0x12b0 net/core/net_namespace.c:341 copy_net_ns+0x551/0xa70 net/core/net_namespace.c:482 create_new_namespaces+0x9a8/0x11e0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x25e/0x340 kernel/nsproxy.c:231 ksys_unshare+0x8d5/0x1120 kernel/fork.c:2985 __do_sys_unshare kernel/fork.c:3053 [inline] __se_sys_unshare+0x41/0x60 kernel/fork.c:3051 __x64_sys_unshare+0x32/0x50 kernel/fork.c:3051 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 =====================================================