syzbot

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10125 ticks this GP) idle=8ee/1/0x4000000000000000 softirq=13026/13027 fqs=1 
	(t=10502 jiffies g=12969 q=293)
rcu: rcu_preempt kthread starved for 10501 jiffies! g12969 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:29192 pid:   13 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4327 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5078
 schedule+0xcf/0x270 kernel/sched/core.c:5157
 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:294
NMI backtrace for cpu 1
CPU: 1 PID: 10331 Comm: syz-executor.2 Not tainted 5.11.0-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+0xfa/0x151 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:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106
 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:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635
RIP: 0010:slab_free_hook mm/slub.c:1539 [inline]
RIP: 0010:slab_free_freelist_hook+0xb6/0x130 mm/slub.c:1580
Code: 02 74 a1 e8 2c 60 c3 ff 8b 73 1c 48 89 ef e8 e1 f2 a2 ff e8 4c 65 c3 ff fb f6 43 0a 40 75 96 8b 73 1c 48 89 ef e8 aa 85 0e 02 <eb> 89 48 83 7b 48 00 75 c8 f7 43 08 00 08 08 00 75 bf 8b 53 1c 31
RSP: 0018:ffffc90000db0c08 EFLAGS: 00000282
RAX: 0000000000000000 RBX: ffff8881406f5c80 RCX: 0000000000000000
RDX: 0000000000000107 RSI: 0000000000000107 RDI: 0000000000000001
RBP: ffff888027f7b140 R08: 0000000000000001 R09: ffffffff8fa818a7
R10: fffffbfff1f50314 R11: 000000000000003f R12: 0001000000000000
R13: ffffc90000db0c40 R14: ffff888027f7b140 R15: ffffc90000db0c48
 slab_free mm/slub.c:3143 [inline]
 kmem_cache_free+0x82/0x350 mm/slub.c:3159
 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:683
 __kfree_skb net/core/skbuff.c:740 [inline]
 kfree_skb net/core/skbuff.c:757 [inline]
 kfree_skb+0x140/0x3f0 net/core/skbuff.c:751
 pfkey_broadcast+0x3dc/0x630 net/key/af_key.c:270
 key_notify_sa_expire net/key/af_key.c:3054 [inline]
 pfkey_send_notify net/key/af_key.c:3069 [inline]
 pfkey_send_notify+0xd78/0xfb0 net/key/af_key.c:3059
 km_state_notify+0xbf/0x1e0 net/xfrm/xfrm_state.c:2176
 km_state_expired net/xfrm/xfrm_state.c:2190 [inline]
 xfrm_timer_handler+0x844/0xbf0 net/xfrm/xfrm_state.c:600
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x609/0xe40 kernel/time/hrtimer.c:1583
 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600
 __do_softirq+0x29b/0x9f6 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:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635
RIP: 0010:_flat_send_IPI_mask+0x42/0x50 arch/x86/kernel/apic/apic_flat_64.c:58
Code: 00 5b e9 01 07 ff ff 89 74 24 04 e8 68 a9 47 00 8b 74 24 04 ba 00 08 00 00 89 df e8 e8 06 ff ff e8 83 ae 47 00 fb 48 83 c4 08 <5b> c3 66 66 2e 0f 1f 84 00 00 00 00 00 90 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc900028575f8 EFLAGS: 00000282
RAX: 00000000000123d1 RBX: 0000000000000001 RCX: ffffffff815828c7
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8fa817a7
R10: fffffbfff1f502f4 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000008
 __smp_call_single_queue kernel/smp.c:270 [inline]
 generic_exec_single+0x122/0x350 kernel/smp.c:303
 smp_call_function_single+0x1a4/0x4b0 kernel/smp.c:509
 smp_call_function_many_cond+0x25f/0x9d0 kernel/smp.c:648
 smp_call_function_many kernel/smp.c:711 [inline]
 smp_call_function kernel/smp.c:733 [inline]
 on_each_cpu+0x4d/0x100 kernel/smp.c:832
 flush_tlb_kernel_range+0x1a5/0x270 arch/x86/mm/tlb.c:957
 __purge_vmap_area_lazy+0x8f9/0x1c50 mm/vmalloc.c:1381
 _vm_unmap_aliases.part.0+0x3d6/0x4e0 mm/vmalloc.c:1784
 _vm_unmap_aliases mm/vmalloc.c:1758 [inline]
 vm_unmap_aliases+0x42/0x50 mm/vmalloc.c:1807
 change_page_attr_set_clr+0x241/0x500 arch/x86/mm/pat/set_memory.c:1732
 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1789 [inline]
 set_memory_ro+0x78/0xa0 arch/x86/mm/pat/set_memory.c:1935
 bpf_jit_binary_lock_ro include/linux/filter.h:851 [inline]
 bpf_int_jit_compile+0xe09/0x11a0 arch/x86/net/bpf_jit_comp.c:2297
 bpf_prog_select_runtime+0x5ce/0xb40 kernel/bpf/core.c:1866
 bpf_migrate_filter+0x2dc/0x380 net/core/filter.c:1294
 bpf_prepare_filter net/core/filter.c:1342 [inline]
 bpf_prog_create_from_user+0x51b/0x660 net/core/filter.c:1436
 seccomp_prepare_filter kernel/seccomp.c:661 [inline]
 seccomp_prepare_user_filter kernel/seccomp.c:698 [inline]
 seccomp_set_mode_filter kernel/seccomp.c:1802 [inline]
 do_seccomp+0x38d/0x2870 kernel/seccomp.c:1922
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x465ef9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3d07dec188 EFLAGS: 00000246 ORIG_RAX: 000000000000013d
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9
RDX: 0000000020000040 RSI: 0000000000000003 RDI: 0000000000000001
RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffeb4be7c2f R14: 00007f3d07dec300 R15: 0000000000022000