IPVS: ovf: UDP 224.0.0.2:0 - no destination available IPVS: ovf: UDP 224.0.0.2:0 - no destination available ip6_tunnel: syztnl1 xmit: Local address not yet configured! IPVS: ovf: UDP 224.0.0.2:0 - no destination available rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=b22c/1/0x4000000000000000 softirq=88045/88047 fqs=209 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P13486/1:b..l rcu: (detected by 1, t=10502 jiffies, g=79949, q=386 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 13511 Comm: syz.1.1463 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline] RIP: 0010:__lock_acquire+0x5f5/0x2630 kernel/locking/lockdep.c:5234 Code: 4c 24 10 44 8b 25 4b e1 f2 0e 45 85 e4 75 3c 85 c9 0f 85 b8 07 00 00 0f b7 43 20 66 25 ff 1f 0f b7 c0 48 0f a3 05 ab eb 2b 14 <0f> 83 35 0b 00 00 48 8d 04 80 48 8d 04 80 48 8d 04 c5 60 5b 10 96 RSP: 0018:ffffc90000007c80 EFLAGS: 00000007 RAX: 0000000000000eee RBX: ffff888031b4b0d0 RCX: 0000000000000000 RDX: 0000000084e51074 RSI: 000000002237f751 RDI: 00000000fc45a1af RBP: ffff888031b4a540 R08: 00000000da0daa5e R09: 0000000000000eee R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000eee R14: 0000000000000000 R15: f972df4c84e51074 FS: 00007f16c359c6c0(0000) GS:ffff888124387000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fe14ff8 CR3: 000000006519f000 CR4: 00000000003526f0 Call Trace: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825 __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 spin_lock include/linux/spinlock.h:342 [inline] advance_sched+0xe5/0xd20 net/sched/sch_taprio.c:930 __run_hrtimer kernel/time/hrtimer.c:1930 [inline] __hrtimer_run_queues+0x470/0xa00 kernel/time/hrtimer.c:1994 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] __sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:write_comp_data+0x40/0x90 kernel/kcov.c:246 Code: 00 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 e9 00 22 84 09 8b 87 ec 16 00 00 85 c0 74 f1 8b 87 c8 16 00 00 <83> f8 03 75 e6 48 8b 87 d0 16 00 00 8b bf cc 16 00 00 48 8b 30 48 RSP: 0018:ffffc9000504fc88 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000080000000 RCX: ffffffff81c6b923 RDX: 0000000080000000 RSI: 0000000000000000 RDI: ffff888031b4a540 RBP: ffff8880b85284c0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000000 R12: fffffbfff21ae32a R13: 1ffff92000a09f9f R14: 0000000000000000 R15: 0000000000000000 percpu_up_read include/linux/percpu-rwsem.h:134 [inline] cpus_read_unlock+0x83/0x150 kernel/cpu.c:502 class_cpus_read_lock_destructor include/linux/cpuhplock.h:48 [inline] clock_was_set+0x657/0x870 kernel/time/hrtimer.c:988 do_settimeofday64+0x330/0x4d0 kernel/time/timekeeping.c:1603 do_sys_settimeofday64+0x1dc/0x260 kernel/time/time.c:195 __do_sys_clock_settime kernel/time/posix-timers.c:1124 [inline] __se_sys_clock_settime kernel/time/posix-timers.c:1108 [inline] __x64_sys_clock_settime+0x1c1/0x2a0 kernel/time/posix-timers.c:1108 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f16c279ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f16c359c028 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3 RAX: ffffffffffffffda RBX: 00007f16c2a16090 RCX: 00007f16c279ce59 RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000 RBP: 00007f16c2832d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f16c2a16128 R14: 00007f16c2a16090 R15: 00007ffcc49e4b98 task:syz.6.1458 state:R running task stack:23496 pid:13486 tgid:13483 ppid:12270 task_flags:0x400640 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1295/0x67a0 kernel/sched/core.c:7189 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x205/0x970 kernel/entry/common.c:164 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:get_current arch/x86/include/asm/current.h:23 [inline] RIP: 0010:write_comp_data+0x10/0x90 kernel/kcov.c:245 Code: 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 8b 05 b9 e5 00 12 49 89 f8 49 89 f1 49 89 d2 <65> 48 8b 3d 90 e5 00 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 RSP: 0000:ffffc90003186c30 EFLAGS: 00000246 RAX: 0000000080000000 RBX: ffff88805527a780 RCX: ffffffff8b80556a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807e106e80 R13: dffffc0000000000 R14: 0000000000000001 R15: 000000110e22ffff mtree_range_walk+0x37a/0xb70 lib/maple_tree.c:2053 mas_state_walk lib/maple_tree.c:2952 [inline] mt_find+0x1c6/0x8e0 lib/maple_tree.c:6271 find_vma+0xbf/0x140 mm/mmap.c:908 gup_vma_lookup+0x20/0x170 mm/gup.c:1275 __get_user_pages+0x241/0x32a0 mm/gup.c:1396 __get_user_pages_locked mm/gup.c:1692 [inline] get_dump_page+0x27e/0x3d0 mm/gup.c:2192 dump_user_range+0x18d/0xad0 fs/coredump.c:1372 elf_core_dump+0x2d5f/0x3d10 fs/binfmt_elf.c:2109 coredump_write fs/coredump.c:1053 [inline] do_coredump fs/coredump.c:1132 [inline] vfs_coredump+0x2980/0x5770 fs/coredump.c:1206 get_signal+0x2162/0x2210 kernel/signal.c:3023 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x98/0x670 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5d9819ce59 RSP: 002b:00007f5d990210e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f5d98415fa8 RCX: 00007f5d9819ce59 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f5d98415fac RBP: 00007f5d98415fa0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5d98416038 R14: 00007fff0e40e7e0 R15: 00007fff0e40e8c8 rcu: rcu_preempt kthread starved for 10083 jiffies! g79949 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:28904 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1295/0x67a0 kernel/sched/core.c:7189 __schedule_loop kernel/sched/core.c:7268 [inline] schedule+0xdd/0x390 kernel/sched/core.c:7283 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 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: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63 Code: a6 92 02 e9 43 44 03 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 23 f2 21 00 fb f4 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffc90000197df0 EFLAGS: 00000242 RAX: 000000000167a28f RBX: ffff88801e2b2540 RCX: ffffffff8b89a225 RDX: 0000000000000000 RSI: ffffffff8df0fe0d RDI: ffffffff8c1c4780 RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10170a67b5 R10: ffff8880b8533dab R11: 0000000000000000 R12: 0000000000000001 R13: ffffed1003c564a8 R14: 0000000000000001 R15: ffffffff90d71950 FS: 0000000000000000(0000) GS:ffff888124487000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f22ec99259f CR3: 000000002b0b9000 CR4: 00000000003526f0 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline] default_idle+0x9/0x10 arch/x86/kernel/process.c:767 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x464/0x590 kernel/sched/idle.c:352 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:451 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x148 IPVS: ovf: UDP 224.0.0.2:0 - no destination available IPVS: ovf: UDP 224.0.0.2:0 - no destination available IPVS: ovf: UDP 224.0.0.2:0 - no destination available IPVS: ovf: UDP 224.0.0.2:0 - no destination available IPVS: ovf: UDP 224.0.0.2:0 - no destination available IPVS: ovf: UDP 224.0.0.2:0 - no destination available IPVS: ovf: UDP 224.0.0.2:0 - no destination available IPVS: ovf: UDP 224.0.0.2:0 - no destination available IPVS: ovf: UDP 224.0.0.2:0 - no destination available