================================================
WARNING: lock held when returning to user space!
syzkaller #0 Not tainted
------------------------------------------------
dhcpcd/5600 is leaving the kernel with locks still held!
1 lock held by dhcpcd/5600:
 #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#0: dhcpcd/5600
Modules linked in:
CPU: 0 UID: 0 PID: 5600 Comm: dhcpcd 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 b1 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 04 b0 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:ffffc90004497b90 EFLAGS: 00010002
RAX: 0000000000000000 RBX: ffff888172988000 RCX: 0000000080000002
RDX: 0000000000000000 RSI: ffffffff8c28aac0 RDI: ffffffff90342920
RBP: dffffc0000000000 R08: ffffffff903098f7 R09: 1ffffffff206131e
R10: dffffc0000000000 R11: fffffbfff206131f R12: 0000000000000000
R13: ffff888172988000 R14: ffff88812103be80 R15: ffff8881729884c4
FS:  00007f5721422740(0000) GS:ffff88818dc93000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f57214226c0 CR3: 0000000112f16000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __schedule+0x2e6/0x5680
 schedule+0x164/0x360
 irqentry_exit+0x263/0x730
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0033:0x7f57214d2a12
Code: Unable to access opcode bytes at 0x7f57214d29e8.
RSP: 002b:00007ffe2ee46cb8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000563186c17201 RCX: 00007f57214d2a12
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffe2ee67228 R08: 0000000000000000 R09: 0000563186c17230
R10: 00007f5721422a10 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000563186c17264
 </TASK>
