ip6_tunnel: ip6gre1 xmit: Local address not yet configured! rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 0, t=10502 jiffies, g=39053, q=967 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 9831 (4294971762-4294961931), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 9831 jiffies! g39053 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:27496 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5510 [inline] __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7326 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 33 Comm: kworker/R-write Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: writeback wb_workfn (flush-8:0) RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x27/0x70 kernel/kcov.c:217 Code: 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 98 6e a6 11 65 8b 15 b9 6e a6 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 <83> b9 24 17 00 00 00 74 2c 8b 91 f8 16 00 00 83 fa 02 75 21 48 8b RSP: 0018:ffffc90000007658 EFLAGS: 00000246 RAX: ffffffff8a2f40e1 RBX: ffff888025a1fc18 RCX: ffff888020eadd00 RDX: 0000000000000100 RSI: 0000000000000200 RDI: 0000000000000000 RBP: ffffc90000007768 R08: 0000000000000003 R09: 0000000000000000 R10: ffffc900000076c0 R11: fffff52000000eda R12: dffffc0000000000 R13: ffff8880b3634494 R14: 0000000000000200 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888124f49000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffeac1e0dcc CR3: 000000007de84000 CR4: 00000000003526f0 Call Trace: tcp_conn_schedule+0x2e1/0x870 net/netfilter/ipvs/ip_vs_proto_tcp.c:51 ip_vs_try_to_schedule net/netfilter/ipvs/ip_vs_core.c:1661 [inline] ip_vs_in_hook+0xcc9/0x1c90 net/netfilter/ipvs/ip_vs_core.c:2246 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619 nf_hook include/linux/netfilter.h:273 [inline] NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:316 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6216 [inline] __netif_receive_skb net/core/dev.c:6329 [inline] process_backlog+0xa34/0x1860 net/core/dev.c:6680 __napi_poll+0xaa/0x330 net/core/dev.c:7739 napi_poll net/core/dev.c:7802 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:7959 handle_softirqs+0x225/0x840 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:27 Code: 48 8d bd 78 ff ff ff 4c 89 e6 4c 89 fa e8 6d 9f 09 00 83 bd 78 ff ff ff 00 74 38 4c 8d bd 78 ff ff ff 4c 89 ff e8 e5 73 09 00 <48> 85 c0 74 24 48 89 df 48 89 c6 4d 89 f3 2e e8 a9 29 92 1e 84 c0 RSP: 0018:ffffc90000a96288 EFLAGS: 00000246 RAX: ffffffff828bf8b3 RBX: ffffc90000a96340 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff8e4b233f RDI: ffffffff828bf8b3 RBP: ffffc90000a96310 R08: ffffc90000a96c70 R09: 0000000000000000 R10: ffffc90000a962d8 R11: fffff52000152c5d R12: ffff888020eadd00 R13: 1ffff110041d5c5f R14: ffffffff81b1fc80 R15: ffffc90000a96288 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 save_stack+0x122/0x230 mm/page_owner.c:165 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320 reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0xc1e/0xd10 mm/page_alloc.c:2950 __slab_free+0x274/0x2c0 mm/slub.c:5741 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4584 [inline] slab_alloc_node mm/slub.c:4917 [inline] __do_kmalloc_node mm/slub.c:5333 [inline] __kmalloc_noprof+0x311/0x720 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] ext4_find_extent+0x1f5/0xcd0 fs/ext4/extents.c:918 ext4_ext_map_blocks+0x2ac/0x5850 fs/ext4/extents.c:4286 ext4_map_create_blocks+0x116/0x530 fs/ext4/inode.c:631 ext4_map_blocks+0x7e4/0x1240 fs/ext4/inode.c:824 mpage_map_one_extent fs/ext4/inode.c:2397 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2491 [inline] ext4_do_writepages+0x23d3/0x47a0 fs/ext4/inode.c:2949 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3043 do_writepages+0x338/0x560 mm/page-writeback.c:2571 __writeback_single_inode+0x12e/0xf90 fs/fs-writeback.c:1787 writeback_sb_inodes+0x9de/0x1b00 fs/fs-writeback.c:2079 __writeback_inodes_wb+0x114/0x240 fs/fs-writeback.c:2155 writeback_inodes_wb+0x197/0x240 fs/fs-writeback.c:2185 wb_workfn+0x10aa/0x10f0 fs/fs-writeback.c:2486 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 rescuer_thread+0x7b6/0x10b0 kernel/workqueue.c:3629 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245