================================================
WARNING: lock held when returning to user space!
syzkaller #0 Not tainted
------------------------------------------------
dhcpcd-run-hook/5573 is leaving the kernel with locks still held!
1 lock held by dhcpcd-run-hook/5573:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240
------------[ cut here ]------------
Voluntary context switch within RCU read-side critical section!
WARNING: kernel/rcu/tree_plugin.h:332 at rcu_note_context_switch+0xcac/0xf40, CPU#1: dhcpcd-run-hook/5573
Modules linked in:
CPU: 1 UID: 0 PID: 5573 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:rcu_note_context_switch+0xcac/0xf40
Code: 00 41 c6 45 00 00 48 8b 3d 91 cc 84 0e 48 81 c4 b8 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d e9 8b 60 ff ff 48 8d 3d 24 af 88 0e <67> 48 0f b9 3a e9 1b f4 ff ff 90 0f 0b 90 45 84 e4 0f 84 ea f3 ff
RSP: 0000:ffffc900044f7b90 EFLAGS: 00010002
RAX: 0000000000000000 RBX: ffff888111e33b00 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8c2883c0 RDI: ffffffff90342720
RBP: dffffc0000000000 R08: ffffffff903096f7 R09: 1ffffffff20612de
R10: dffffc0000000000 R11: fffffbfff20612df R12: 0000000000000000
R13: ffff888111e33b00 R14: ffff88823c63be80 R15: ffff888111e33fc4
FS:  0000000000000000(0000) GS:ffff8882a9293000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8d1f7ef0a0 CR3: 00000001bdc10000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __schedule+0x2e6/0x5680
 schedule+0x164/0x360
 irqentry_exit+0x263/0x730
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0033:0x7f8d1fa77105
Code: 47 d6 4d 89 d7 4d 39 d0 73 7f 44 89 d8 83 e0 02 89 85 f4 fe ff ff 74 3e 4c 89 f9 31 c0 4c 89 c7 4c 29 c1 83 bd f4 fe ff ff 00 <f3> aa 75 5b 48 8b 35 88 79 02 00 44 89 da 44 89 9d f4 fe ff ff 48
RSP: 002b:00007ffd8bdfc140 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 00007ffd8bdfc1e8 RCX: 0000000000000f60
RDX: 0000000000000003 RSI: 0000000000001000 RDI: 00007f8d1f7ef0a0
RBP: 00007ffd8bdfc510 R08: 00007f8d1f7ef0a0 R09: 000000000000b000
R10: 00007f8d1f7f0000 R11: 0000000000000003 R12: 00007f8d1fa66a00
R13: 00007ffd8bdfc598 R14: 00007f8d1f7f1888 R15: 00007f8d1f7f0000
 </TASK>
