syzbot

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=cfe/1/0x4000000000000002 softirq=53884/53885 fqs=0 
rcu: 	 (t=29988 jiffies g=72133 q=198)
NMI backtrace for cpu 0
CPU: 0 PID: 12976 Comm: syz-executor.4 Not tainted 5.1.0-rc7+ #98
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.c:1223
 print_cpu_stall kernel/rcu/tree.c:1360 [inline]
 check_cpu_stall kernel/rcu/tree.c:1434 [inline]
 rcu_pending kernel/rcu/tree.c:3103 [inline]
 rcu_sched_clock_irq.cold+0x500/0xa4a kernel/rcu/tree.c:2544
 update_process_times+0x32/0x80 kernel/time/timer.c:1635
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x33e/0xde0 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
 smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1060
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:check_memory_region_inline mm/kasan/generic.c:173 [inline]
RIP: 0010:check_memory_region+0x0/0x190 mm/kasan/generic.c:191
Code: 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 f2 be f8 00 00 00 48 89 e5 e8 af 2c 66 05 5d c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 <48> 85 f6 0f 84 21 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 55 0f b6
RSP: 0018:ffff8880587c7e38 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffff8880ae82dd80 RCX: ffffffff815ecff4
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880ae82de38
RBP: ffff8880587c7e40 R08: ffff8880522be040 R09: ffffffff895e69d4
R10: ffff8880522be8c0 R11: ffff8880522be040 R12: ffff8880ae82de38
R13: 0000000000000000 R14: 0000000000004000 R15: 0000000000000000
 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
 rcu_dynticks_curr_cpu_in_eqs+0x54/0xb0 kernel/rcu/tree.c:297
 rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:944
 rcu_read_lock+0x43/0x70 include/linux/rcupdate.h:596
 get_mem_cgroup_from_mm+0x1e/0x2b0 mm/memcontrol.c:841
 inotify_new_group fs/notify/inotify/inotify_user.c:647 [inline]
 do_inotify_init+0x279/0x640 fs/notify/inotify/inotify_user.c:678
 __ia32_sys_inotify_init+0x10/0x20 fs/notify/inotify/inotify_user.c:697
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x20000108
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 98 46 0f 72 d4 00 0f 05 <c4> 42 fd 31 d3 c4 a3 7b f0 c5 3e 14 d5 41 e2 e9 9f c4 c1 c1 62 c1
RSP: 002b:00007f1cb99e4bd8 EFLAGS: 00000282 ORIG_RAX: 00000000000000fd
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 0000000020000108
RDX: 2be1ef2a11dbdbda RSI: 0000000000000000 RDI: 00007f1cb99e5608
RBP: 000000000000000a R08: 0000000000000005 R09: 0000000000000006
R10: 0000000000000007 R11: 0000000000000282 R12: 000000000000000b
R13: 000000000000000c R14: 000000000000000d R15: 00000000ffffffff
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1