rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (0 ticks this GP) idle=c45/1/0x4000000000000000 softirq=161837/161837 fqs=3 (detected by 1, t=10502 jiffies, g=245821, q=36) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 26994 Comm: kworker/u4:0 Not tainted 5.17.0-rc3-syzkaller-00116-gf1baf68e1383 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:match_held_lock+0x77/0xc0 kernel/locking/lockdep.c:5117 Code: 53 20 81 e2 ff 1f 00 00 48 39 d0 0f 94 c0 48 83 c4 08 0f b6 c0 5b c3 31 f6 e8 c5 fe ff ff 48 85 c0 75 b2 31 c0 48 83 c4 08 5b 48 83 c4 08 b8 01 00 00 00 5b c3 e8 18 df 90 fa 85 c0 74 e4 8b RSP: 0018:ffffc90000007c20 EFLAGS: 00000086 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8bb83b60 RDI: ffff888058518b00 RBP: ffffffff8bb83b60 R08: 0000000000000000 R09: ffffffff8d93c9d7 R10: fffffbfff1b2793a R11: 0000000000000001 R12: ffff888058518000 R13: ffff888058518a60 R14: 00000000ffffffff R15: ffff888058518b00 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020800000 CR3: 000000001d7a4000 CR4: 0000000000350ef0 Call Trace: __lock_is_held kernel/locking/lockdep.c:5380 [inline] lock_is_held_type+0xa7/0x140 kernel/locking/lockdep.c:5682 lock_is_held include/linux/lockdep.h:283 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x522/0x720 kernel/locking/lockdep.c:5650 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline] _raw_spin_unlock_irqrestore+0x16/0x70 kernel/locking/spinlock.c:194 debug_object_deactivate lib/debugobjects.c:757 [inline] debug_object_deactivate+0x264/0x300 lib/debugobjects.c:723 debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline] debug_deactivate kernel/time/hrtimer.c:481 [inline] __run_hrtimer kernel/time/hrtimer.c:1653 [inline] __hrtimer_run_queues+0x3f8/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:lock_acquire+0x1ef/0x510 kernel/locking/lockdep.c:5607 Code: 1d a5 7e 83 f8 01 0f 85 b4 02 00 00 9c 58 f6 c4 02 0f 85 9f 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc90002cefba8 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff9200059df77 RCX: 2f0cba9cfb70d26a RDX: 1ffff1100b0a314b RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8ffbf947 R10: fffffbfff1ff7f28 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000000 R14: ffffffff8bb83c20 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:268 [inline] rcu_read_lock include/linux/rcupdate.h:694 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0x12d/0xfa0 net/batman-adv/network-coding.c:719 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: rcu_preempt kthread starved for 10496 jiffies! g245821 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:28736 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4986 [inline] __schedule+0xab2/0x4db0 kernel/sched/core.c:6295 schedule+0xd2/0x260 kernel/sched/core.c:6368 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1963 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2136 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: NMI backtrace for cpu 1 CPU: 1 PID: 4918 Comm: kworker/1:9 Not tainted 5.17.0-rc3-syzkaller-00116-gf1baf68e1383 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events bpf_prog_free_deferred Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:458 print_other_cpu_stall kernel/rcu/tree_stall.h:563 [inline] check_cpu_stall kernel/rcu/tree_stall.h:706 [inline] rcu_pending kernel/rcu/tree.c:3919 [inline] rcu_sched_clock_irq+0x1f7c/0x2150 kernel/rcu/tree.c:2617 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline] RIP: 0010:smp_call_function_many_cond+0x447/0xc90 kernel/smp.c:969 Code: 0b 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 4c 89 f5 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 7b 87 0b 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 95 06 00 00 8b 43 08 31 RSP: 0018:ffffc9000ac1f990 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b9c41fa0 RCX: 0000000000000000 RDX: ffff88807f179d00 RSI: ffffffff816cf105 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff816cf12b R11: 0000000000000000 R12: ffffed10173883f5 R13: 0000000000000000 R14: ffff8880b9c41fa8 R15: 0000000000000001 on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1135 __purge_vmap_area_lazy+0x1f6/0x1c50 mm/vmalloc.c:1689 _vm_unmap_aliases.part.0+0x3f0/0x500 mm/vmalloc.c:2113 _vm_unmap_aliases mm/vmalloc.c:2087 [inline] vm_remove_mappings mm/vmalloc.c:2597 [inline] __vunmap+0x620/0xc50 mm/vmalloc.c:2624 __vfree+0x3c/0xd0 mm/vmalloc.c:2683 vfree+0x5a/0x90 mm/vmalloc.c:2714 bpf_jit_binary_free kernel/bpf/core.c:908 [inline] bpf_jit_free+0xbb/0x1c0 kernel/bpf/core.c:921 bpf_prog_free_deferred+0x5c1/0x790 kernel/bpf/core.c:2300 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 53 push %rbx 1: 20 81 e2 ff 1f 00 and %al,0x1fffe2(%rcx) 7: 00 48 39 add %cl,0x39(%rax) a: d0 0f rorb (%rdi) c: 94 xchg %eax,%esp d: c0 48 83 c4 rorb $0xc4,-0x7d(%rax) 11: 08 0f or %cl,(%rdi) 13: b6 c0 mov $0xc0,%dh 15: 5b pop %rbx 16: c3 retq 17: 31 f6 xor %esi,%esi 19: e8 c5 fe ff ff callq 0xfffffee3 1e: 48 85 c0 test %rax,%rax 21: 75 b2 jne 0xffffffd5 23: 31 c0 xor %eax,%eax 25: 48 83 c4 08 add $0x8,%rsp 29: 5b pop %rbx * 2a: c3 retq <-- trapping instruction 2b: 48 83 c4 08 add $0x8,%rsp 2f: b8 01 00 00 00 mov $0x1,%eax 34: 5b pop %rbx 35: c3 retq 36: e8 18 df 90 fa callq 0xfa90df53 3b: 85 c0 test %eax,%eax 3d: 74 e4 je 0x23 3f: 8b .byte 0x8b