last executing test programs:

kernel console output (not intermixed with test programs):

Warning: Permanently added '[localhost]:54698' (ED25519) to the list of known hosts.
syzkaller login: [   57.453344][ T5546] cgroup: Unknown subsys name 'net'
[   57.520115][ T5546] cgroup: Unknown subsys name 'cpuset'
[   57.526064][ T5546] cgroup: Unknown subsys name 'rlimit'
[   57.529538][ T5600] 
[   57.530477][ T5600] ================================================
[   57.532775][ T5600] WARNING: lock held when returning to user space!
[   57.534970][ T5600] syzkaller #0 Not tainted
[   57.536506][ T5600] ------------------------------------------------
[   57.538735][ T5600] dhcpcd/5600 is leaving the kernel with locks still held!
[   57.541125][ T5600] 1 lock held by dhcpcd/5600:
[   57.542601][ T5600]  #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240
[   57.547061][ T5600] ------------[ cut here ]------------
[   57.548925][ T5600] Voluntary context switch within RCU read-side critical section!
[   57.548933][ T5600] WARNING: kernel/rcu/tree_plugin.h:332 at rcu_note_context_switch+0xcac/0xf40, CPU#0: dhcpcd/5600
[   57.554756][ T5600] Modules linked in:
[   57.556229][ T5600] CPU: 0 UID: 0 PID: 5600 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full) 
[   57.559456][ T5600] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[   57.563036][ T5600] RIP: 0010:rcu_note_context_switch+0xcac/0xf40
[   57.565254][ T5600] 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
[   57.571936][ T5600] RSP: 0000:ffffc90004497b90 EFLAGS: 00010002
[   57.574039][ T5600] RAX: 0000000000000000 RBX: ffff888172988000 RCX: 0000000080000002
[   57.576776][ T5600] RDX: 0000000000000000 RSI: ffffffff8c28aac0 RDI: ffffffff90342920
[   57.579536][ T5600] RBP: dffffc0000000000 R08: ffffffff903098f7 R09: 1ffffffff206131e
[   57.582263][ T5600] R10: dffffc0000000000 R11: fffffbfff206131f R12: 0000000000000000
[   57.584983][ T5600] R13: ffff888172988000 R14: ffff88812103be80 R15: ffff8881729884c4
[   57.587737][ T5600] FS:  00007f5721422740(0000) GS:ffff88818dc93000(0000) knlGS:0000000000000000
[   57.590886][ T5600] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   57.593127][ T5600] CR2: 00007f57214226c0 CR3: 0000000112f16000 CR4: 00000000000006f0
[   57.596032][ T5600] Call Trace:
[   57.597269][ T5600]  <TASK>
[   57.598439][ T5600]  ? __schedule+0x17ca/0x5680
[   57.600133][ T5600]  ? rcu_is_watching+0x15/0xb0
[   57.601859][ T5600]  __schedule+0x2e6/0x5680
[   57.603444][ T5600]  ? lock_release+0x4b/0x3c0
[   57.605095][ T5600]  ? __pfx___schedule+0x10/0x10
[   57.606844][ T5600]  ? wakeup_preempt_fair+0xe5/0xb30
[   57.608643][ T5600]  ? trace_irq_enable+0x3b/0x140
[   57.610359][ T5600]  ? __pfx___schedule+0x10/0x10
[   57.612094][ T5600]  ? trace_irq_disable+0x3b/0x140
[   57.613953][ T5600]  schedule+0x164/0x360
[   57.615438][ T5600]  irqentry_exit+0x263/0x730
[   57.617046][ T5600]  asm_sysvec_call_function_single+0x1a/0x20
[   57.619225][ T5600] RIP: 0033:0x7f57214d2a12
[   57.620833][ T5600] Code: Unable to access opcode bytes at 0x7f57214d29e8.
[   57.623263][ T5600] RSP: 002b:00007ffe2ee46cb8 EFLAGS: 00000246
[   57.625545][ T5600] RAX: 0000000000000000 RBX: 0000563186c17201 RCX: 00007f57214d2a12
[   57.628329][ T5600] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
[   57.631156][ T5600] RBP: 00007ffe2ee67228 R08: 0000000000000000 R09: 0000563186c17230
[   57.634006][ T5600] R10: 00007f5721422a10 R11: 0000000000000246 R12: 0000000000000000
[   57.636772][ T5600] R13: 0000000000000000 R14: 0000000000000000 R15: 0000563186c17264
[   57.639557][ T5600]  </TASK>
[   57.640688][ T5600] Kernel panic - not syncing: kernel: panic_on_warn set ...
[   57.642920][ T5600] CPU: 0 UID: 0 PID: 5600 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full) 
[   57.645723][ T5600] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[   57.649055][ T5600] Call Trace:
[   57.650213][ T5600]  <TASK>
[   57.651201][ T5600]  vpanic+0x56c/0xa60
[   57.652345][ T5600]  ? __pfx__printk+0x10/0x10
[   57.653679][ T5600]  ? __pfx_vpanic+0x10/0x10
[   57.655085][ T5600]  ? is_bpf_text_address+0x292/0x2b0
[   57.656854][ T5600]  ? is_bpf_text_address+0x26/0x2b0
[   57.658535][ T5600]  panic+0xc5/0xd0
[   57.659729][ T5600]  ? __pfx_panic+0x10/0x10
[   57.661160][ T5600]  __warn+0x315/0x4c0
[   57.662546][ T5600]  ? rcu_note_context_switch+0xcac/0xf40
[   57.664230][ T5600]  ? rcu_note_context_switch+0xcac/0xf40
[   57.665973][ T5600]  __report_bug+0x29a/0x540
[   57.667531][ T5600]  ? rcu_note_context_switch+0xcac/0xf40
[   57.669469][ T5600]  ? __pfx___report_bug+0x10/0x10
[   57.671227][ T5600]  ? ktime_get_real_ts64+0xa9/0x3e0
[   57.673037][ T5600]  ? rcu_is_watching+0x15/0xb0
[   57.674678][ T5600]  ? rcu_is_watching+0x15/0xb0
[   57.676176][ T5600]  report_bug_entry+0x19a/0x290
[   57.677835][ T5600]  ? rcu_note_context_switch+0xcac/0xf40
[   57.679536][ T5600]  ? rcu_note_context_switch+0xcb1/0xf40
[   57.681323][ T5600]  handle_bug+0xce/0x200
[   57.682817][ T5600]  exc_invalid_op+0x1a/0x50
[   57.684410][ T5600]  asm_exc_invalid_op+0x1a/0x20
[   57.685895][ T5600] RIP: 0010:rcu_note_context_switch+0xcac/0xf40
[   57.687803][ T5600] 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
[   57.694614][ T5600] RSP: 0000:ffffc90004497b90 EFLAGS: 00010002
[   57.696783][ T5600] RAX: 0000000000000000 RBX: ffff888172988000 RCX: 0000000080000002
[   57.699613][ T5600] RDX: 0000000000000000 RSI: ffffffff8c28aac0 RDI: ffffffff90342920
[   57.702191][ T5600] RBP: dffffc0000000000 R08: ffffffff903098f7 R09: 1ffffffff206131e
[   57.704793][ T5600] R10: dffffc0000000000 R11: fffffbfff206131f R12: 0000000000000000
[   57.707474][ T5600] R13: ffff888172988000 R14: ffff88812103be80 R15: ffff8881729884c4
[   57.710193][ T5600]  ? __schedule+0x17ca/0x5680
[   57.711902][ T5600]  ? rcu_is_watching+0x15/0xb0
[   57.713574][ T5600]  __schedule+0x2e6/0x5680
[   57.714974][ T5600]  ? lock_release+0x4b/0x3c0
[   57.716269][ T5600]  ? __pfx___schedule+0x10/0x10
[   57.717764][ T5600]  ? wakeup_preempt_fair+0xe5/0xb30
[   57.719250][ T5600]  ? trace_irq_enable+0x3b/0x140
[   57.720649][ T5600]  ? __pfx___schedule+0x10/0x10
[   57.722070][ T5600]  ? trace_irq_disable+0x3b/0x140
[   57.723681][ T5600]  schedule+0x164/0x360
[   57.725030][ T5600]  irqentry_exit+0x263/0x730
[   57.726497][ T5600]  asm_sysvec_call_function_single+0x1a/0x20
[   57.728530][ T5600] RIP: 0033:0x7f57214d2a12
[   57.730102][ T5600] Code: Unable to access opcode bytes at 0x7f57214d29e8.
[   57.732547][ T5600] RSP: 002b:00007ffe2ee46cb8 EFLAGS: 00000246
[   57.734595][ T5600] RAX: 0000000000000000 RBX: 0000563186c17201 RCX: 00007f57214d2a12
[   57.736884][ T5600] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
[   57.739248][ T5600] RBP: 00007ffe2ee67228 R08: 0000000000000000 R09: 0000563186c17230
[   57.741538][ T5600] R10: 00007f5721422a10 R11: 0000000000000246 R12: 0000000000000000
[   57.743725][ T5600] R13: 0000000000000000 R14: 0000000000000000 R15: 0000563186c17264
[   57.746188][ T5600]  </TASK>
[   57.747943][ T5600] Kernel Offset: disabled
[   57.749263][ T5600] Rebooting in 86400 seconds..
