rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10352 ticks this GP) idle=7a6/1/0x4000000000000000 softirq=20358/20360 fqs=5212 
	(t=10502 jiffies g=22461 q=160761)
NMI backtrace for cpu 1
CPU: 1 PID: 15232 Comm: syz-executor.4 Not tainted 5.10.0-rc7-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+0x107/0x163 lib/dump_stack.c:118
 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+0x1e3/0x21e kernel/rcu/tree_stall.h:331
 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:637 [inline]
 rcu_pending kernel/rcu/tree.c:3694 [inline]
 rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567
 update_process_times+0x77/0xd0 kernel/time/timer.c:1709
 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:1519 [inline]
 __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097
 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:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:deref_stack_regs arch/x86/kernel/unwind_orc.c:370 [inline]
RIP: 0010:unwind_next_frame+0x112a/0x1f90 arch/x86/kernel/unwind_orc.c:544
Code: 00 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 18 4c 8b 44 24 20 48 8d b9 80 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 c3 08 00 00 4c 89 e6 48 8b 81 80 00 00 00 48 ba 00 00 00 00
RSP: 0000:ffffc90000d90608 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 1ffff920001b20c9 RCX: ffffc90002c5fd78
RDX: 1ffff9200058bfbf RSI: ffffc90002c5fd78 RDI: ffffc90002c5fdf8
RBP: 0000000000000001 R08: ffffffff8df5d622 R09: ffffffff8df5d626
R10: 0000000000082081 R11: 0000000000000001 R12: ffffc90000d90728
R13: ffffc90000d90715 R14: ffffc90000d90730 R15: ffffc90000d906e0
 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:48
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56
 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0x102/0x140 mm/kasan/common.c:422
 slab_free_hook mm/slub.c:1544 [inline]
 slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1577
 slab_free mm/slub.c:3142 [inline]
 kmem_cache_free+0x82/0x350 mm/slub.c:3158
 kfree_skbmem+0x166/0x1b0 net/core/skbuff.c:643
 sk_wmem_free_skb include/net/sock.h:1537 [inline]
 tcp_write_queue_purge+0x24d/0x14a0 net/ipv4/tcp.c:2616
 tcp_write_err net/ipv4/tcp_timer.c:55 [inline]
 tcp_write_timeout net/ipv4/tcp_timer.c:269 [inline]
 tcp_retransmit_timer+0x240b/0x35d0 net/ipv4/tcp_timer.c:500
 tcp_write_timer_handler+0x79b/0xa60 net/ipv4/tcp_timer.c:610
 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:630
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1410
 expire_timers kernel/time/timer.c:1455 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1747
 __run_timers kernel/time/timer.c:1728 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760
 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298
 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:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x132/0x200 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:199
Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 0e 3b 6e f8 48 89 ef e8 96 ef 6e f8 e8 51 d9 8d f8 fb bf 01 00 00 00 <e8> a6 5b 63 f8 65 8b 05 cf 05 1a 77 85 c0 74 02 5d c3 e8 6b 5b 18
RSP: 0000:ffffc90002c5fe20 EFLAGS: 00000206
RAX: 0000000000002627 RBX: ffffc90002c5fe90 RCX: 1ffffffff19d8e91
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffff8880b9f34940 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880b9f34940
R13: ffff88801a6e0000 R14: ffff8880b9f34940 R15: ffff88801a6e0000
 rq_unlock_irq kernel/sched/sched.h:1317 [inline]
 __schedule+0x17af/0x2130 kernel/sched/core.c:4531
 schedule+0xcf/0x270 kernel/sched/core.c:4606
 exit_to_user_mode_loop kernel/entry/common.c:152 [inline]
 exit_to_user_mode_prepare+0xe6/0x1a0 kernel/entry/common.c:191
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:279
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0033:0x460f5a
Code: 25 18 00 00 00 00 74 01 f0 48 0f b1 3d 0f a7 25 01 48 39 c2 75 da f3 c3 0f 1f 84 00 00 00 00 00 48 63 ff b8 e4 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 f3 c3 0f 1f 40 00 48 c7 c2 d4 ff ff ff f7
RSP: 002b:00007f5756ec6c48 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00000000004c4e0e RCX: 0000000000460f5a
RDX: 00000000004e1c00 RSI: 00007f5756ec6c50 RDI: 0000000000000001
RBP: 000000000119c028 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007ffec90834cf R14: 00007f5756ec79c0 R15: 000000000119c034