syzbot

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (8981 ticks this GP) idle=fa2/1/0x4000000000000002 softirq=250699/250699 fqs=1195 
	(t=10501 jiffies g=495621 q=573835)
NMI backtrace for cpu 1
CPU: 1 PID: 8690 Comm: syz-executor.4 Not tainted 5.2.0-rc1+ #2
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+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf 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:2625 [inline]
 rcu_sched_clock_irq.cold+0x4d1/0xbfd kernel/rcu/tree.c:2161
 update_process_times+0x32/0x80 kernel/time/timer.c:1639
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1298
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x33b/0xdd0 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1040 [inline]
 smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1065
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806
 </IRQ>
RIP: 0010:arch_local_irq_enable arch/x86/include/asm/paravirt.h:778 [inline]
RIP: 0010:cache_grow_begin+0x3eb/0x650 mm/slab.c:2600
Code: eb 56 cd ff e9 b8 fd ff ff 0f 0b e9 7b fc ff ff e8 1a 5b cd ff 48 83 3d 22 ae 09 07 00 0f 84 ab 01 00 00 fb 66 0f 1f 44 00 00 <e9> 77 fc ff ff 48 8b 8b 88 00 00 00 44 89 fe 48 89 c7 e8 ce f4 05
RSP: 0018:ffff888210f2fc48 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: ffff88821bc48b00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff888210f20ebc
RBP: ffff888210f2fc88 R08: ffff888210f20640 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000cc0
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000cc0
 fallback_alloc+0x1fd/0x2d0 mm/slab.c:3153
 ____cache_alloc_node+0x1be/0x1e0 mm/slab.c:3221
 __do_cache_alloc mm/slab.c:3290 [inline]
 slab_alloc mm/slab.c:3318 [inline]
 kmem_cache_alloc+0x1e8/0x6f0 mm/slab.c:3488
 getname_flags fs/namei.c:138 [inline]
 getname_flags+0xd6/0x5b0 fs/namei.c:128
 getname+0x1a/0x20 fs/namei.c:209
 do_sys_open+0x2c9/0x5d0 fs/open.c:1063
 __do_sys_open fs/open.c:1087 [inline]
 __se_sys_open fs/open.c:1082 [inline]
 __x64_sys_open+0x7e/0xc0 fs/open.c:1082
 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x2000000c
Code: Bad RIP value.
RSP: 002b:00007fe18cf41bd8 EFLAGS: 00000202 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 000000002000000c
RDX: baa3f26b851480d1 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000013 R08: 0000000000000005 R09: 0000000000000006
R10: 0000000000000007 R11: 0000000000000202 R12: 000000000000000b
R13: 000000000000000c R14: 000000000000000d R15: 00000000ffffffff