rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10500 ticks this GP) idle=91e/1/0x4000000000000000 softirq=62852/62852 fqs=0 
	(t=10500 jiffies g=124005 q=400)
rcu: rcu_preempt kthread starved for 10500 jiffies! g124005 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:28888 pid:   13 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4313 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5064
 schedule+0xcf/0x270 kernel/sched/core.c:5143
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1878
 rcu_gp_fqs_loop kernel/rcu/tree.c:1940 [inline]
 rcu_gp_kthread+0xbbe/0x1d70 kernel/rcu/tree.c:2113
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
NMI backtrace for cpu 0
CPU: 0 PID: 5185 Comm: syz-executor.4 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x1f4/0x230 kernel/rcu/tree_stall.h:337
 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:643 [inline]
 rcu_pending kernel/rcu/tree.c:3751 [inline]
 rcu_sched_clock_irq.cold+0x48e/0xedf kernel/rcu/tree.c:2580
 update_process_times+0x16d/0x200 kernel/time/timer.c:1782
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
 sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:unwind_next_frame+0x37e/0x1f90 arch/x86/kernel/unwind_orc.c:456
Code: 00 00 00 00 00 fc ff df 4c 89 ca 48 c1 ea 03 0f b6 04 02 4c 89 ca 83 e2 07 38 d0 7f 08 84 c0 0f 85 6f 08 00 00 41 0f b6 40 04 <a8> 0f 0f 85 aa 00 00 00 49 8d 78 05 48 b8 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90000007720 EFLAGS: 00000246
RAX: 0000000000000015 RBX: 1ffff92000000eec RCX: ffffffff83d4f36c
RDX: 0000000000000000 RSI: ffffffff8dabb83c RDI: ffffffff8d309784
RBP: 0000000000000001 R08: ffffffff8dabb8b4 R09: ffffffff8dabb8b8
R10: 0000000000082083 R11: 000000000008fd10 R12: ffffc90000007840
R13: ffffc9000000782d R14: ffffc90000007848 R15: ffffc900000077f8
 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:401 [inline]
 ____kasan_kmalloc.constprop.0+0x7f/0xa0 mm/kasan/common.c:429
 kasan_slab_alloc include/linux/kasan.h:209 [inline]
 slab_post_alloc_hook mm/slab.h:512 [inline]
 slab_alloc_node mm/slab.c:3257 [inline]
 kmem_cache_alloc_node_trace+0x1d3/0x520 mm/slab.c:3596
 __do_kmalloc_node mm/slab.c:3618 [inline]
 __kmalloc_node_track_caller+0x38/0x60 mm/slab.c:3633
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0xae/0x5a0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 mrp_pdu_init net/802/mrp.c:300 [inline]
 mrp_pdu_append_vecattr_event+0x7b4/0x1020 net/802/mrp.c:399
 mrp_attr_event+0x191/0x280 net/802/mrp.c:494
 mrp_mad_event net/802/mrp.c:574 [inline]
 mrp_join_timer+0x5a/0xc0 net/802/mrp.c:591
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417
 expire_timers kernel/time/timer.c:1462 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731
 __run_timers kernel/time/timer.c:1712 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744
 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu kernel/softirq.c:420 [inline]
 irq_exit_rcu+0x134/0x200 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:console_unlock+0x7b6/0xbb0 kernel/printk/printk.c:2580
Code: e0 27 28 8b e8 eb 97 fd ff e8 c6 3d 00 00 31 ff 4c 89 ee e8 6c a5 17 00 4d 85 ed 0f 85 3a 02 00 00 e8 ce 9e 17 00 ff 34 24 9d <8b> 5c 24 34 31 ff 89 de e8 dd a4 17 00 85 db 0f 84 eb f9 ff ff e8
RSP: 0018:ffffc90008f0edd0 EFLAGS: 00000212
RAX: 0000000000004f1f RBX: 0000000000000000 RCX: ffffc90015cfa000
RDX: 0000000000040000 RSI: ffffffff815b2e02 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8ed417a7
R10: fffffbfff1da82f4 R11: 0000000000000000 R12: ffffffff84aa8a40
R13: 0000000000000200 R14: dffffc0000000000 R15: ffffc90008f0ee30
 vprintk_emit+0x189/0x490 kernel/printk/printk.c:2092
 vprintk_func+0x8d/0x1e0 kernel/printk/printk_safe.c:393
 printk+0xba/0xed kernel/printk/printk.c:2140
 __nla_validate_parse.cold+0x96/0xa7 lib/nlattr.c:600
 __nla_parse+0x3d/0x50 lib/nlattr.c:685
 nla_parse_nested_deprecated include/net/netlink.h:1231 [inline]
 __rtnl_newlink+0x386/0x16e0 net/core/rtnetlink.c:3292
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3491
 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7e25a32c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000006
RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007ffd8bf79fef R14: 00007f7e25a339c0 R15: 000000000119bf8c
NMI backtrace for cpu 0
CPU: 0 PID: 5185 Comm: syz-executor.4 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__irq_exit_rcu kernel/softirq.c:413 [inline]
RIP: 0010:irq_exit_rcu+0x5/0x200 kernel/softirq.c:432
Code: eb c5 e8 3e ca 70 00 eb 81 66 90 66 2e 0f 1f 84 00 00 00 00 00 e8 5b 36 b6 07 e9 16 ff ff ff 66 0f 1f 44 00 00 55 53 9c 58 fa <f6> c4 02 75 4e 31 f6 65 48 8b 3c 25 00 f0 01 00 e8 36 40 0b 00 bf
RSP: 0018:ffffc90000007ab0 EFLAGS: 00000002
RAX: 0000000000000002 RBX: 0000000000000000 RCX: 1ffffffff1a07c5b
RDX: 0000000000000000 RSI: 0000000000010302 RDI: 0000000000000000
RBP: ffffc90000007ae8 R08: 0000000000000000 R09: ffffffff8d03b10f
R10: fffffbfff1a07621 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f7e25a33700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7e259aedb8 CR3: 000000007b10e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:write_comp_data kernel/kcov.c:218 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x15/0x80 kernel/kcov.c:270
Code: 00 48 89 4c 38 f0 4e 89 54 c8 20 48 89 10 c3 66 0f 1f 44 00 00 53 41 89 fb 41 89 f1 bf 03 00 00 00 65 48 8b 0c 25 00 f0 01 00 <48> 89 ce 4c 8b 54 24 08 e8 de ef ff ff 84 c0 74 51 48 8b 81 b0 14
RSP: 0018:ffffc90000007b90 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8caa87c0 RCX: ffff88809867c040
RDX: 1ffffffff1955120 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff86f8e2de R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8caa87d0 R14: 0000000000000000 R15: ffffffff8caa88b0
 qdisc_run_begin include/net/sch_generic.h:165 [inline]
 __dev_xmit_skb net/core/dev.c:3808 [inline]
 __dev_queue_xmit+0x1d7e/0x2dd0 net/core/dev.c:4119
 mrp_queue_xmit net/802/mrp.c:351 [inline]
 mrp_join_timer+0x8a/0xc0 net/802/mrp.c:595
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417
 expire_timers kernel/time/timer.c:1462 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731
 __run_timers kernel/time/timer.c:1712 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744
 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu kernel/softirq.c:420 [inline]
 irq_exit_rcu+0x134/0x200 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:console_unlock+0x7b6/0xbb0 kernel/printk/printk.c:2580
Code: e0 27 28 8b e8 eb 97 fd ff e8 c6 3d 00 00 31 ff 4c 89 ee e8 6c a5 17 00 4d 85 ed 0f 85 3a 02 00 00 e8 ce 9e 17 00 ff 34 24 9d <8b> 5c 24 34 31 ff 89 de e8 dd a4 17 00 85 db 0f 84 eb f9 ff ff e8
RSP: 0018:ffffc90008f0edd0 EFLAGS: 00000212
RAX: 0000000000004f1f RBX: 0000000000000000 RCX: ffffc90015cfa000
RDX: 0000000000040000 RSI: ffffffff815b2e02 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8ed417a7
R10: fffffbfff1da82f4 R11: 0000000000000000 R12: ffffffff84aa8a40
R13: 0000000000000200 R14: dffffc0000000000 R15: ffffc90008f0ee30
 vprintk_emit+0x189/0x490 kernel/printk/printk.c:2092
 vprintk_func+0x8d/0x1e0 kernel/printk/printk_safe.c:393
 printk+0xba/0xed kernel/printk/printk.c:2140
 __nla_validate_parse.cold+0x96/0xa7 lib/nlattr.c:600
 __nla_parse+0x3d/0x50 lib/nlattr.c:685
 nla_parse_nested_deprecated include/net/netlink.h:1231 [inline]
 __rtnl_newlink+0x386/0x16e0 net/core/rtnetlink.c:3292
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3491
 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7e25a32c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000006
RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007ffd8bf79fef R14: 00007f7e25a339c0 R15: 000000000119bf8c