rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10499 ticks this GP) idle=aee/1/0x4000000000000002 softirq=11640/11640 fqs=8 (t=10501 jiffies g=6877 q=216) rcu: rcu_preempt kthread starved for 10485 jiffies! g6877 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29048 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081 schedule+0x181/0x210 kernel/sched/core.c:4155 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 0 CPU: 0 PID: 8485 Comm: syz-executor.0 Not tainted 5.5.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0xe25/0x1ad0 kernel/rcu/tree.c:2271 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:167 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:free_thread_stack+0x18b/0x590 kernel/fork.c:284 Code: ff ff e8 28 04 00 00 43 80 3c 2e 00 74 08 4c 89 e7 e8 39 94 6a 00 49 8b 1c 24 48 83 c3 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 <74> 08 48 89 df e8 1b 94 6a 00 48 8b 1b e9 82 ff ff ff e8 be 2b 2e RSP: 0018:ffffc90002317208 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff11011f52521 RBX: ffff88808fa92908 RCX: ffff8880a15a2100 RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea0002550fc0 RBP: ffffc90002317240 R08: 000000000003a728 R09: ffffed101303c299 R10: ffffed101303c299 R11: 0000000000000000 R12: ffff88808fa929a0 R13: dffffc0000000000 R14: 1ffff11011f52534 R15: ffff8880981e14b8 release_task_stack kernel/fork.c:440 [inline] put_task_stack+0xa3/0x130 kernel/fork.c:451 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256 context_switch kernel/sched/core.c:3388 [inline] __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081 preempt_schedule_irq+0xc1/0x140 kernel/sched/core.c:4338 retint_kernel+0x1b/0x2b RIP: 0010:on_stack arch/x86/kernel/unwind_frame.c:211 [inline] RIP: 0010:update_stack_state+0xff/0x530 arch/x86/kernel/unwind_frame.c:224 Code: 85 fc 02 00 00 41 c6 06 01 ba a8 00 00 00 4d 89 e5 eb 05 ba 10 00 00 00 4c 89 f8 49 83 c7 08 48 8d 70 10 4c 89 6d b0 4c 01 ea <48> 89 55 88 4c 8d 70 18 48 8d 48 28 48 89 4d b8 49 89 c4 48 83 c0 RSP: 0018:ffffc90002317450 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: ffffc900023175b0 RBX: dffffc0000000000 RCX: ffff8880a15a2100 RDX: ffffc900023176a0 RSI: ffffc900023175c0 RDI: ffffc900023175b0 RBP: ffffc900023174f8 R08: ffffffff8165c225 R09: ffffc900023175b0 R10: fffff52000462ec2 R11: 0000000000000000 R12: 0000000000000000 R13: ffffc90002317690 R14: ffffc900023175e8 R15: ffffc900023175b8 unwind_next_frame+0x3f1/0x7a0 arch/x86/kernel/unwind_frame.c:311 arch_stack_walk+0xb4/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xb6/0x150 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:513 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:521 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slab.c:3263 [inline] kmem_cache_alloc_node+0x235/0x280 mm/slab.c:3575 alloc_vmap_area+0xf1/0x1b80 mm/vmalloc.c:1108 __get_vm_area_node+0x1a1/0x350 mm/vmalloc.c:2109 __vmalloc_node_range+0xe1/0x850 mm/vmalloc.c:2541 __vmalloc_node mm/vmalloc.c:2601 [inline] __vmalloc_node_flags mm/vmalloc.c:2615 [inline] vzalloc+0x73/0x80 mm/vmalloc.c:2660 alloc_counters+0x6b/0x6e0 net/ipv6/netfilter/ip6_tables.c:816 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:838 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1041 [inline] do_ip6t_get_ctl+0x4a6/0x9b0 net/ipv6/netfilter/ip6_tables.c:1709 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x287/0x2b0 net/netfilter/nf_sockopt.c:122 ipv6_getsockopt+0x1c3/0x2c0 net/ipv6/ipv6_sockglue.c:1400 tcp_getsockopt+0xbe/0xd0 net/ipv4/tcp.c:3690 sock_common_getsockopt+0x99/0xb0 net/core/sock.c:3108 __sys_getsockopt+0x24c/0x2b0 net/socket.c:2162 __do_sys_getsockopt net/socket.c:2177 [inline] __se_sys_getsockopt net/socket.c:2174 [inline] __x64_sys_getsockopt+0xbf/0xd0 net/socket.c:2174 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45da5a Code: b8 34 01 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 8d 8b fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 6a 8b fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007ffc90637728 EFLAGS: 00000212 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00007ffc90637750 RCX: 000000000045da5a RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 0000000000719cc0 R08: 00007ffc9063774c R09: 0000000000004000 R10: 00007ffc90637850 R11: 0000000000000212 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000000000029 R15: 0000000000718880