rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=9b2/1/0x4000000000000000 softirq=253269/253269 fqs=5152 
	(t=10500 jiffies g=535573 q=39555)
NMI backtrace for cpu 1
CPU: 1 PID: 12977 Comm: syz-executor.2 Not tainted 5.9.0-rc1-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:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x194/0x1cf kernel/rcu/tree_stall.h:318
 print_cpu_stall kernel/rcu/tree_stall.h:551 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 rcu_pending kernel/rcu/tree.c:3637 [inline]
 rcu_sched_clock_irq.cold+0x5b3/0xccd kernel/rcu/tree.c:2519
 update_process_times+0x25/0xa0 kernel/time/timer.c:1710
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 sysvec_apic_timer_interrupt+0x4c/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:29 [inline]
RIP: 0010:__orc_find+0x83/0xf0 arch/x86/kernel/unwind_orc.c:51
Code: 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 <48> 01 d8 48 39 c1 73 b0 4c 8d 63 fc 49 39 ec 73 b3 4d 29 ee 49 c1
RSP: 0018:ffffc90000da86b8 EFLAGS: 00000246
RAX: fffffffff6a26a43 RBX: ffffffff8ac1c3c0 RCX: ffffffff81642ead
RDX: 0000000000000000 RSI: ffffffff8b200ad0 RDI: ffffffff8ac1c3b8
RBP: ffffffff8ac1c3b8 R08: ffffffff8b200aee R09: ffffffff8b200ad0
R10: 000000000007201e R11: 000000000001780e R12: ffffffff8ac1c3c8
R13: ffffffff8ac1c3b8 R14: ffffffff8ac1c3b8 R15: dffffc0000000000
 orc_find arch/x86/kernel/unwind_orc.c:172 [inline]
 unwind_next_frame+0x342/0x1f90 arch/x86/kernel/unwind_orc.c:449
 arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 slab_post_alloc_hook mm/slab.h:518 [inline]
 slab_alloc_node mm/slab.c:3254 [inline]
 kmem_cache_alloc_node_trace+0x13f/0x400 mm/slab.c:3592
 __do_kmalloc_node mm/slab.c:3614 [inline]
 __kmalloc_node_track_caller+0x38/0x60 mm/slab.c:3629
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0xae/0x550 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1085 [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+0x173/0x220 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+0x1ac/0x760 kernel/time/timer.c:1413
 expire_timers kernel/time/timer.c:1458 [inline]
 __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755
 __run_timers kernel/time/timer.c:1736 [inline]
 run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768
 __do_softirq+0x2de/0xa24 kernel/softirq.c:298
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x1f3/0x230 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:get_stack_info+0x0/0x154 arch/x86/kernel/dumpstack_64.c:153
Code: 25 46 77 89 74 1e 83 ff 04 48 c7 c0 c1 71 69 89 74 12 83 ef 05 31 c0 83 ff 03 77 08 48 8b 04 fd 00 a6 45 88 c3 0f 1f 44 00 00 <48> 85 ff 41 55 41 54 55 53 48 89 d3 0f 84 17 01 00 00 48 85 f6 48
RSP: 0018:ffffc90017447730 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffc90017447810 RCX: ffffc900174477a8
RDX: ffffc90017447788 RSI: ffff88802cdea200 RDI: ffffc90017447738
RBP: ffff88802cdea200 R08: 0000000000000001 R09: ffffc90017447788
R10: fffff52002e88efc R11: 0000000000000000 R12: ffffc900174477a8
R13: ffffc900174477b0 R14: ffffc900174477c0 R15: ffffc90017447788
 __unwind_start+0x4aa/0x800 arch/x86/kernel/unwind_orc.c:671
 unwind_start arch/x86/include/asm/unwind.h:60 [inline]
 arch_stack_walk+0x5e/0xf0 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 slab_post_alloc_hook mm/slab.h:518 [inline]
 slab_alloc mm/slab.c:3312 [inline]
 kmem_cache_alloc_trace+0x137/0x2c0 mm/slab.c:3548
 kmalloc include/linux/slab.h:554 [inline]
 dccp_feat_entry_new+0x1a6/0x390 net/dccp/feat.c:464
 dccp_feat_push_change net/dccp/feat.c:484 [inline]
 __feat_register_sp+0x369/0x5a0 net/dccp/feat.c:740
 dccp_feat_init+0x2bb/0x820 net/dccp/feat.c:1470
 dccp_init_sock+0x2fc/0x3d0 net/dccp/proto.c:205
 dccp_v6_init_sock+0x1b/0xa0 net/dccp/ipv6.c:997
 inet6_create net/ipv6/af_inet6.c:256 [inline]
 inet6_create+0x9e3/0xf90 net/ipv6/af_inet6.c:110
 __sock_create+0x3ca/0x740 net/socket.c:1427
 sock_create net/socket.c:1478 [inline]
 __sys_socket+0xef/0x200 net/socket.c:1520
 __do_sys_socket net/socket.c:1529 [inline]
 __se_sys_socket net/socket.c:1527 [inline]
 __x64_sys_socket+0x6f/0xb0 net/socket.c:1527
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d4d9
Code: 5d 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fedf3630c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000032b80 RCX: 000000000045d4d9
RDX: 0000000000000000 RSI: 0000000000000806 RDI: 000000000000000a
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007fff468e868f R14: 00007fedf36319c0 R15: 000000000118cf4c