IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 ticks this GP) idle=4b54/1/0x4000000000000000 softirq=25776/25776 fqs=0 rcu: (detected by 1, t=10502 jiffies, g=18745, q=226 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 8158 Comm: syz.4.936 Not tainted 6.12.0-syzkaller-10689-g7af08b57bcb9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:debug_object_activate+0x3d/0x4a0 lib/debugobjects.c:805 Code: 00 00 00 00 fc ff df 53 48 83 e4 f0 48 81 ec c0 00 00 00 48 c7 44 24 20 b3 8a b5 41 4c 8d 4c 24 20 48 c7 44 24 28 76 fc 9a 8d <4d> 89 ce 48 c7 44 24 30 90 ed 9a 84 49 c1 ee 03 4b 8d 04 26 c7 00 RSP: 0018:ffffc90000007d00 EFLAGS: 00000086 RAX: 0000000080010001 RBX: ffff8880b862cb00 RCX: ffffffff817bf816 RDX: ffff888035c84880 RSI: ffffffff8b6fa2c0 RDI: ffff88807bfd3340 RBP: ffffc90000007df0 R08: 0000000000000001 R09: ffffc90000007d20 R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff8880b862ca00 R15: ffffffff893c4970 FS: 000055557ff0d500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30b1cff8 CR3: 00000000274f8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_hrtimer_activate kernel/time/hrtimer.c:428 [inline] debug_activate kernel/time/hrtimer.c:469 [inline] enqueue_hrtimer+0x25/0x3c0 kernel/time/hrtimer.c:1076 __run_hrtimer kernel/time/hrtimer.c:1756 [inline] __hrtimer_run_queues+0x903/0xae0 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:ep_unregister_pollwait fs/eventpoll.c:688 [inline] RIP: 0010:ep_clear_and_put+0x11f/0x440 fs/eventpoll.c:915 Code: 88 01 00 00 48 89 c2 48 89 04 24 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 e6 02 00 00 49 8b 9e 88 01 00 00 <49> bc 00 00 00 00 00 fc ff df 48 85 db 0f 84 26 01 00 00 e8 f9 75 RSP: 0018:ffffc9000fa2fda0 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff888035abd840 RCX: fffff52001f45f92 RDX: 1ffff11004c9eb31 RSI: ffffffff8bd1e540 RDI: 0000000000000001 RBP: ffff88806144d1c8 R08: 0000000000000000 R09: fffffbfff20c149a R10: ffffc9000fa2fda0 R11: 0000000000000000 R12: ffff88806144d1d0 R13: ffff8880238c4508 R14: ffff8880264f5800 R15: ffff8880238c4508 ep_eventpoll_release+0x3e/0x60 fs/eventpoll.c:967 __fput+0x3f8/0xb60 fs/file_table.c:450 task_work_run+0x14e/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f11fd980849 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe7bc95488 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 000000000001f560 RCX: 00007f11fd980849 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f11fdb47ba0 R08: 0000000000000001 R09: 00007ffe7bc9576f R10: 00007f11fd800000 R11: 0000000000000246 R12: 000000000001f5a3 R13: 00007f11fdb45fa0 R14: 0000000000000032 R15: ffffffffffffffff rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g18745 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=6820 rcu: rcu_preempt kthread starved for 10502 jiffies! g18745 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27568 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2045 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2247 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available IPVS: rr: UDP 224.0.0.2:0 - no destination available