INFO: rcu_sched self-detected stall on CPU
	1-....: (124999 ticks this GP) idle=4ba/1/4611686018427387906 softirq=26069/26069 fqs=31225 
	 (t=125000 jiffies g=12860 c=12859 q=1201)
NMI backtrace for cpu 1
CPU: 1 PID: 8705 Comm: syz-executor2 Not tainted 4.16.0+ #375
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
 nmi_trigger_cpumask_backtrace+0x123/0x180 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:156 [inline]
 rcu_dump_cpu_stacks+0x186/0x1de kernel/rcu/tree.c:1375
 print_cpu_stall kernel/rcu/tree.c:1524 [inline]
 check_cpu_stall.isra.61+0xbb8/0x15b0 kernel/rcu/tree.c:1592
 __rcu_pending kernel/rcu/tree.c:3361 [inline]
 rcu_pending kernel/rcu/tree.c:3423 [inline]
 rcu_check_callbacks+0x238/0xd20 kernel/rcu/tree.c:2763
 update_process_times+0x30/0x60 kernel/time/timer.c:1636
 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162
 tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1194
 __run_hrtimer kernel/time/hrtimer.c:1349 [inline]
 __hrtimer_run_queues+0x39c/0xec0 kernel/time/hrtimer.c:1411
 hrtimer_interrupt+0x2a5/0x6f0 kernel/time/hrtimer.c:1469
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:857
 </IRQ>
RIP: 0010:__bitmap_parselist+0x302/0x4b0 lib/bitmap.c:615
RSP: 0018:ffff88018bb7f6d8 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff12
RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffffff830f07c5
RDX: 0000000000000000 RSI: ffffc90007aee000 RDI: ffff8801cc3ee860
RBP: ffff88018bb7f750 R08: ffffed003987dd0d R09: ffff8801cc3ee860
R10: 0000000000000001 R11: ffffed003987dd0c R12: 0000000000000009
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
 bitmap_parselist+0x3a/0x50 lib/bitmap.c:628
 cpulist_parse include/linux/cpumask.h:639 [inline]
 update_cpumask kernel/cgroup/cpuset.c:974 [inline]
 cpuset_write_resmask+0x1694/0x2850 kernel/cgroup/cpuset.c:1724
 cgroup_file_write+0x2ae/0x710 kernel/cgroup/cgroup.c:3429
 kernfs_fop_write+0x2bc/0x440 fs/kernfs/file.c:316
 __vfs_write+0xef/0x970 fs/read_write.c:480
 vfs_write+0x189/0x510 fs/read_write.c:544
 SYSC_write fs/read_write.c:589 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:581
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x455269
RSP: 002b:00007fbe42ee8c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fbe42ee96d4 RCX: 0000000000455269
RDX: 0000000000000004 RSI: 0000000020000040 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000006b1 R14: 00000000006fc138 R15: 0000000000000000
INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 1-... } 125346 jiffies s: 2545 root: 0x2/.
blocking rcu_node structures:
Task dump for CPU 1:
syz-executor2   R  running task    25640  8705   4530 0x0000000c
Call Trace: