IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5450/1:b..l rcu: (detected by 0, t=10503 jiffies, g=9829, q=1176517 ncpus=2) task:syz.1.52 state:R running task stack:22480 pid:5450 tgid:5450 ppid:5243 flags:0x20004006 Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x1895/0x4b30 kernel/sched/core.c:6682 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7004 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5829 Code: 2b 00 74 08 4c 89 f7 e8 8a 3f 8e 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25 RSP: 0018:ffffc90015bb6ea0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff92002b76de0 RCX: 9eccaddaa61d9900 RDX: dffffc0000000000 RSI: ffffffff8c0adc40 RDI: ffffffff8c60fb20 RBP: ffffc90015bb6ff0 R08: ffffffff942c7807 R09: 1ffffffff2858f00 R10: dffffc0000000000 R11: fffffbfff2858f01 R12: 1ffff92002b76ddc R13: dffffc0000000000 R14: ffffc90015bb6f00 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] page_ext_get+0x3d/0x2a0 mm/page_ext.c:525 __page_table_check_zero+0xb1/0x350 mm/page_table_check.c:148 page_table_check_free include/linux/page_table_check.h:41 [inline] free_pages_prepare mm/page_alloc.c:1109 [inline] free_unref_folios+0xf26/0x18d0 mm/page_alloc.c:2686 folios_put_refs+0x76c/0x860 mm/swap.c:1007 folio_batch_release include/linux/pagevec.h:101 [inline] shmem_undo_range+0x64c/0x1cf0 mm/shmem.c:1032 shmem_truncate_range mm/shmem.c:1144 [inline] shmem_evict_inode+0x29b/0xa80 mm/shmem.c:1272 evict+0x4e8/0x9b0 fs/inode.c:725 __dentry_kill+0x20d/0x630 fs/dcache.c:615 dput+0x19f/0x2b0 fs/dcache.c:857 __fput+0x5d2/0x880 fs/file_table.c:439 task_work_run+0x24f/0x310 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x28e0 kernel/exit.c:939 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 get_signal+0x16a3/0x1740 kernel/signal.c:2917 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 __do_fast_syscall_32+0xc4/0x110 arch/x86/entry/common.c:389 do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf73cd579 RSP: 002b:00000000f751fa60 EFLAGS: 00000206 ORIG_RAX: 000000000000010b RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 00000000f751fa94 RSI: 00000000f751fa8c RDI: 00000000f751fa94 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 rcu: rcu_preempt kthread starved for 1109 jiffies! g9829 f0x2 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:25552 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x1895/0x4b30 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6774 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5275 Comm: kworker/1:3 Not tainted 6.12.0-rc2-syzkaller-00205-g1d227fcc7222 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events nsim_dev_trap_report_work RIP: 0010:debug_object_deactivate+0x1e3/0x390 lib/debugobjects.c:767 Code: 89 df e8 f0 17 3c fd eb bd 44 3b 3d 27 a5 5a 0b 0f 8e 81 00 00 00 44 89 3d 1a a5 5a 0b eb 78 48 8d 53 10 49 89 d4 49 c1 ec 03 <43> 0f b6 04 34 84 c0 0f 85 1e 01 00 00 8b 02 8d 48 ff 83 f9 03 4c RSP: 0018:ffffc90000a18c20 EFLAGS: 00000802 RAX: 1ffff1100575196f RBX: ffff88802ba8cb60 RCX: 0000000000000001 RDX: ffff88802ba8cb70 RSI: 0000000000000004 RDI: ffffc90000a18b00 RBP: ffffc90000a18d10 R08: 0000000000000003 R09: fffff52000143160 R10: dffffc0000000000 R11: fffff52000143160 R12: 1ffff1100575196e R13: ffffffff9a760460 R14: dffffc0000000000 R15: 0000000000000060 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000c243dcc CR3: 000000007bc44000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_timer_deactivate kernel/time/timer.c:841 [inline] debug_deactivate kernel/time/timer.c:885 [inline] detach_timer+0x24/0x320 kernel/time/timer.c:932 expire_timers kernel/time/timer.c:1828 [inline] __run_timers kernel/time/timer.c:2419 [inline] __run_timer_base+0x5ef/0x8e0 kernel/time/timer.c:2430 run_timer_base kernel/time/timer.c:2439 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2449 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554 do_softirq+0x11b/0x1e0 kernel/softirq.c:455 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382 spin_unlock_bh include/linux/spinlock.h:396 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline] nsim_dev_trap_report_work+0x75d/0xaa0 drivers/net/netdevsim/dev.c:850 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available