rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=576/1/0x4000000000000002 softirq=11249/11250 fqs=0 
	(t=10500 jiffies g=6389 q=74)
rcu: rcu_preempt kthread starved for 10500 jiffies! g6389 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29032    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 1
CPU: 1 PID: 8288 Comm: syz-executor.1 Not tainted 5.4.0-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: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:1514 [inline]
 __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1576
 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1638
 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
 </IRQ>
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:98
Code: 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 53 48 89 fb e8 13 00 00 00 48 8b 3d 74 25 cd 07 48 89 de e8 64 02 3b 00 5b 5d c3 cc <48> 8b 04 24 65 48 8b 0c 25 c0 1d 02 00 65 8b 15 b8 81 8b 7e f7 c2
RSP: 0018:ffffc90001d77400 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff11012ad30e1 RBX: ffffea0002a66b00 RCX: ffff88808f4b2000
RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea0002a66b00
RBP: ffffc90001d77440 R08: 000000000003a768 R09: ffffed1012504337
R10: ffffed1012504337 R11: 0000000000000000 R12: ffff8880956986a0
R13: dffffc0000000000 R14: 1ffff11012ad30d4 R15: ffff8880928219a8
 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:__memset+0x0/0x30 arch/x86/lib/memset_64.S:30
Code: 66 44 8b 1e 66 44 8b 54 16 fe 66 44 89 1f 66 44 89 54 17 fe eb 0c 48 83 fa 01 72 06 44 8a 1e 44 88 1f c3 cc cc cc cc cc cc cc <eb> 2e 0f 1f 00 49 89 f9 48 89 d1 83 e2 07 48 c1 e9 03 40 0f b6 f6
RSP: 0018:ffffc90001d77658 EFLAGS: 00000256 ORIG_RAX: ffffffffffffff13
RAX: ffff88808f4b2001 RBX: ffffc90001d77710 RCX: ffffffff81353c34
RDX: 0000000000000060 RSI: 0000000000000000 RDI: ffffc90001d77710
RBP: ffffc90001d77678 R08: dffffc0000000000 R09: fffff520003aeeee
R10: fffff520003aeeee R11: 0000000000000000 R12: dffffc0000000000
R13: ffffc90001d77710 R14: 0000000000000000 R15: 0000000000000060
 __unwind_start+0x34/0x440 arch/x86/kernel/unwind_frame.c:371
 unwind_start arch/x86/include/asm/unwind.h:60 [inline]
 arch_stack_walk+0x78/0xe0 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0xb6/0x150 kernel/stacktrace.c:123
 save_stack mm/kasan/common.c:71 [inline]
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:512
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:526
 kmem_cache_alloc_trace+0x221/0x2f0 mm/slab.c:3551
 kmalloc include/linux/slab.h:556 [inline]
 memcg_schedule_kmem_cache_create mm/memcontrol.c:2715 [inline]
 memcg_kmem_get_cache+0x37a/0x590 mm/memcontrol.c:2804
 slab_pre_alloc_hook mm/slab.h:572 [inline]
 slab_alloc mm/slab.c:3306 [inline]
 kmem_cache_alloc+0x86/0x2e0 mm/slab.c:3484
 vm_area_dup kernel/fork.c:359 [inline]
 dup_mmap+0x587/0xe00 kernel/fork.c:544
 dup_mm+0x9e/0x340 kernel/fork.c:1360
 copy_mm kernel/fork.c:1416 [inline]
 copy_process+0x1e49/0x5510 kernel/fork.c:2072
 _do_fork+0x13e/0x660 kernel/fork.c:2421
 __do_sys_clone kernel/fork.c:2576 [inline]
 __se_sys_clone kernel/fork.c:2557 [inline]
 __x64_sys_clone+0x20b/0x250 kernel/fork.c:2557
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458c4a
Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 0c 25 10 00 00 00 31 d2 4d 8d 91 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 f5 00 00 00 85 c0 41 89 c5 0f 85 fc 00 00
RSP: 002b:00007ffc3c151a30 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffc3c151a30 RCX: 0000000000458c4a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffc3c151a70 R08: 0000000000000001 R09: 0000000001919940
R10: 0000000001919c10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffc3c151ac0