rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=599/1/0x4000000000000000 softirq=46571/46572 fqs=18 (detected by 0, t=10506 jiffies, g=47993, q=327) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3597 Comm: kworker/u4:5 Not tainted 5.15.161-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: netns cleanup_net RIP: 0010:lock_acquire+0x104/0x4f0 kernel/locking/lockdep.c:5596 Code: 68 08 00 84 c0 0f 84 b9 02 00 00 48 c7 c0 c4 9f e4 8d 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 dd 02 00 00 83 3d d0 f5 81 0c 00 <0f> 84 3f 01 00 00 65 8b 05 ff ce 9f 7e 85 c0 0f 85 88 01 00 00 65 RSP: 0018:ffffc90000dd0b40 EFLAGS: 00000002 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff8162a9bc RDX: 0000000000000000 RSI: ffffffff8ad8f720 RDI: ffffffff8ad8f6e0 RBP: ffffc90000dd0c98 R08: dffffc0000000000 R09: fffffbfff1bc8d86 R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920001ba170 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88801b0e0ad8 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32926000 CR3: 0000000060c0f000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:363 [inline] advance_sched+0x47/0x940 net/sched/sch_taprio.c:716 __run_hrtimer kernel/time/hrtimer.c:1686 [inline] __hrtimer_run_queues+0x598/0xcf0 kernel/time/hrtimer.c:1750 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__cancel_work_timer+0x4fe/0x6a0 kernel/workqueue.c:3180 Code: 77 01 00 00 e8 a3 5a 2d 00 4d 85 e4 49 be 00 00 00 00 00 fc ff df 75 07 e8 8f 5a 2d 00 eb 06 e8 88 5a 2d 00 fb 44 8b 64 24 18 <80> 3d cb 26 0d 0e 00 74 14 e8 74 5a 2d 00 4c 89 ff be 01 00 00 00 RSP: 0018:ffffc900031e7720 EFLAGS: 00000293 RAX: ffffffff81530048 RBX: 0000000000000046 RCX: ffff88801b0e0000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900031e78a8 R08: ffffffff8153001f R09: fffffbfff1f7f21a R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001 R13: 1ffff11003b51adc R14: dffffc0000000000 R15: ffff88801da8d6e0 batadv_nc_mesh_free+0x4a/0xf0 net/batman-adv/network-coding.c:1871 batadv_mesh_free+0x70/0x140 net/batman-adv/main.c:269 batadv_softif_free+0x11/0x20 net/batman-adv/soft-interface.c:989 netdev_run_todo+0xa05/0xc40 net/core/dev.c:10651 default_device_exit_batch+0x395/0x3f0 net/core/dev.c:11628 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x763/0xb60 net/core/net_namespace.c:599 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300 rcu: rcu_preempt kthread starved for 10415 jiffies! g47993 f0x0 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:26432 pid: 15 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5030 [inline] __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376 schedule+0x11b/0x1f0 kernel/sched/core.c:6459 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1914 rcu_gp_fqs_loop+0x2bf/0x1080 kernel/rcu/tree.c:1972 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300 rcu: Stack dump where RCU GP kthread last ran: NMI backtrace for cpu 0 CPU: 0 PID: 8679 Comm: syz-executor.1 Not tainted 5.15.161-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline] rcu_check_gp_kthread_starvation+0x1d2/0x240 kernel/rcu/tree_stall.h:487 print_other_cpu_stall+0x137a/0x14d0 kernel/rcu/tree_stall.h:592 check_cpu_stall kernel/rcu/tree_stall.h:745 [inline] rcu_pending kernel/rcu/tree.c:3932 [inline] rcu_sched_clock_irq+0xa38/0x1150 kernel/rcu/tree.c:2619 update_process_times+0x196/0x200 kernel/time/timer.c:1818 tick_sched_handle kernel/time/tick-sched.c:254 [inline] tick_sched_timer+0x386/0x550 kernel/time/tick-sched.c:1473 __run_hrtimer kernel/time/hrtimer.c:1686 [inline] __hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1750 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:193 Code: 1f 84 00 00 00 00 00 0f 1f 00 53 48 89 fb e8 17 00 00 00 48 8b 3d 98 13 64 0c 48 89 de 5b e9 47 f7 48 00 cc cc cc cc cc cc cc <48> 8b 04 24 65 48 8b 0d e4 14 82 7e 65 8b 15 e5 14 82 7e f7 c2 00 RSP: 0018:ffffc900032c7218 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 1ffff110173680b9 RCX: 0000000000040000 RDX: ffffc9000f859000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc900032c7360 R08: ffffffff81748ee4 R09: fffffbfff1f7f21a R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001 R13: ffff8880b9b405c8 R14: ffff8880b9a3b3c0 R15: 0000000000000001 csd_lock_wait kernel/smp.c:440 [inline] smp_call_function_many_cond+0xab4/0xd90 kernel/smp.c:969 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1135 __purge_vmap_area_lazy+0x294/0x1740 mm/vmalloc.c:1683 _vm_unmap_aliases+0x453/0x4e0 mm/vmalloc.c:2107 change_page_attr_set_clr+0x308/0x1050 arch/x86/mm/pat/set_memory.c:1740 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1797 [inline] set_memory_ro+0xa1/0xe0 arch/x86/mm/pat/set_memory.c:1943 bpf_jit_binary_lock_ro include/linux/filter.h:891 [inline] bpf_int_jit_compile+0xbf57/0xc6e0 arch/x86/net/bpf_jit_comp.c:2372 bpf_prog_select_runtime+0x6e2/0x9b0 kernel/bpf/core.c:1930 bpf_prog_load+0x131c/0x1b60 kernel/bpf/syscall.c:2357 __sys_bpf+0x343/0x670 kernel/bpf/syscall.c:4651 __do_sys_bpf kernel/bpf/syscall.c:4755 [inline] __se_sys_bpf kernel/bpf/syscall.c:4753 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4753 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f3a13c6af29 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3a127e40c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f3a13da1f80 RCX: 00007f3a13c6af29 RDX: 0000000000000090 RSI: 0000000020000440 RDI: 0000000000000005 RBP: 00007f3a13cda074 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f3a13da1f80 R15: 00007ffd31bd5f08