last executing test programs:
kernel console output (not intermixed with test programs):
Warning: Permanently added '[localhost]:59763' (ED25519) to the list of known hosts.
[ 42.346835][ T5649] cgroup: Unknown subsys name 'net'
[ 42.499217][ T5649] cgroup: Unknown subsys name 'cpuset'
[ 42.504187][ T5649] cgroup: Unknown subsys name 'rlimit'
[ 42.508004][ T5683]
[ 42.508836][ T5683] ================================================
[ 42.510909][ T5683] WARNING: lock held when returning to user space!
[ 42.513008][ T5683] syzkaller #0 Not tainted
[ 42.514439][ T5683] ------------------------------------------------
[ 42.516517][ T5683] dhcpcd-run-hook/5683 is leaving the kernel with locks still held!
[ 42.518966][ T5683] 1 lock held by dhcpcd-run-hook/5683:
[ 42.520697][ T5683] #0: ffffffff8e7e52e0 (rcu_read_lock){....}-{1:3}, at: do_fault+0x8b4/0x1750
[ 42.524189][ T5683] ------------[ cut here ]------------
[ 42.525920][ T5683] Voluntary context switch within RCU read-side critical section!
[ 42.525926][ T5683] WARNING: kernel/rcu/tree_plugin.h:332 at rcu_note_context_switch+0x859/0x19c0, CPU#1: dhcpcd-run-hook/5683
[ 42.531853][ T5683] Modules linked in:
[ 42.533147][ T5683] CPU: 1 UID: 0 PID: 5683 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full)
[ 42.536156][ T5683] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 42.539291][ T5683] RIP: 0010:rcu_note_context_switch+0x859/0x19c0
[ 42.541279][ T5683] Code: c1 ea 03 80 3c 02 00 0f 85 9b 0b 00 00 48 8b 53 28 b9 01 00 00 00 4c 89 ef e8 a3 cf fe ff e9 1d f9 ff ff 48 8d 3d 37 ac ed 0e <67> 48 0f b9 3a e9 99 f8 ff ff 48 b8 00 00 00 00 00 fc ff df 48 8d
[ 42.547270][ T5683] RSP: 0000:ffffc90003b37cf0 EFLAGS: 00010002
[ 42.549197][ T5683] RAX: 0000000000000001 RBX: ffff88802b33c3c0 RCX: ffffffff81ed2401
[ 42.551683][ T5683] RDX: 0000000000000000 RSI: ffffffff8c1c2080 RDI: ffffffff90db4460
[ 42.554342][ T5683] RBP: ffff88802214ca00 R08: 0000000000000000 R09: fffffbfff21af62a
[ 42.556894][ T5683] R10: ffffffff90d7b157 R11: 0000000000000001 R12: 0000000000000000
[ 42.559436][ T5683] R13: ffff88802214cec4 R14: ffff88802b33b380 R15: ffffffff90d7e4c4
[ 42.561973][ T5683] FS: 00007f95b83edc80(0000) GS:ffff888097280000(0000) knlGS:0000000000000000
[ 42.564853][ T5683] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 42.566989][ T5683] CR2: 00007f95b8709feb CR3: 000000004d7ad000 CR4: 0000000000352ef0
[ 42.569794][ T5683] Call Trace:
[ 42.570880][ T5683]
[ 42.571812][ T5683] ? try_to_wake_up+0x5ec/0x1900
[ 42.573449][ T5683] ? rcu_is_watching+0x12/0xc0
[ 42.575003][ T5683] ? __schedule+0x32d5/0x6820
[ 42.576528][ T5683] ? rcu_is_watching+0x12/0xc0
[ 42.578093][ T5683] ? schedule+0xdd/0x390
[ 42.579573][ T5683] __schedule+0x276/0x6820
[ 42.581018][ T5683] ? __pfx_sched_clock_cpu+0x10/0x10
[ 42.582730][ T5683] ? irqtime_account_irq+0xc9/0x2d0
[ 42.584442][ T5683] ? __pfx___schedule+0x10/0x10
[ 42.585994][ T5683] ? trace_irq_enable.constprop.0+0x31/0x160
[ 42.587920][ T5683] schedule+0xdd/0x390
[ 42.589261][ T5683] irqentry_exit+0x359/0x790
[ 42.590771][ T5683] asm_sysvec_apic_timer_interrupt+0x1a/0x20
[ 42.592697][ T5683] RIP: 0033:0x7f95b8709feb
[ 42.594183][ T5683] Code: 08 48 8b 78 08 48 89 13 e8 5e f9 ff ff 97 e8 bb ff ff ff 48 09 e8 40 0f 95 c5 40 0f b6 ed eb 04 48 83 2b 08 48 95 5a 5b 5d c3 <55> 53 89 fb 48 83 ec 18 48 8b 3e 48 89 74 24 08 e8 a9 e7 f9 ff 80
[ 42.600263][ T5683] RSP: 002b:00007fff193633f8 EFLAGS: 00010287
[ 42.602193][ T5683] RAX: 00007f95b8754190 RBX: 0000564cf772e910 RCX: 0000000000000002
[ 42.604736][ T5683] RDX: 0000564cf772e910 RSI: 0000564cf7737120 RDI: 0000000000000004
[ 42.607254][ T5683] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000020
[ 42.609771][ T5683] R10: 0000000000000040 R11: 0000000000000000 R12: 0000564cf7736e50
[ 42.612297][ T5683] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
[ 42.614849][ T5683]
[ 42.615875][ T5683] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 42.618208][ T5683] CPU: 1 UID: 0 PID: 5683 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full)
[ 42.621242][ T5683] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 42.624476][ T5683] Call Trace:
[ 42.625581][ T5683]
[ 42.626550][ T5683] dump_stack_lvl+0x100/0x190
[ 42.628112][ T5683] vpanic+0x552/0x970
[ 42.629407][ T5683] ? __pfx_vpanic+0x10/0x10
[ 42.630891][ T5683] ? lock_release+0x245/0x310
[ 42.632419][ T5683] panic+0xd1/0xe0
[ 42.633642][ T5683] ? __pfx_panic+0x10/0x10
[ 42.635082][ T5683] ? check_panic_on_warn+0x1f/0x90
[ 42.636733][ T5683] check_panic_on_warn.cold+0x19/0x34
[ 42.638453][ T5683] ? rcu_note_context_switch+0x859/0x19c0
[ 42.640305][ T5683] __warn.cold+0x191/0x328
[ 42.641756][ T5683] __report_bug+0x296/0x3d0
[ 42.643277][ T5683] ? rcu_note_context_switch+0x859/0x19c0
[ 42.645111][ T5683] ? __pfx___report_bug+0x10/0x10
[ 42.646722][ T5683] ? debug_object_activate+0x331/0x490
[ 42.648379][ T5683] ? lock_release+0x245/0x310
[ 42.649888][ T5683] ? trace_rcu_utilization+0x31/0x240
[ 42.651617][ T5683] ? debug_object_activate+0x331/0x490
[ 42.653380][ T5683] report_bug_entry+0xe1/0x290
[ 42.654916][ T5683] ? rcu_note_context_switch+0x859/0x19c0
[ 42.656742][ T5683] handle_bug+0x1cd/0x2a0
[ 42.658135][ T5683] exc_invalid_op+0x17/0x50
[ 42.659615][ T5683] asm_exc_invalid_op+0x1a/0x20
[ 42.661182][ T5683] RIP: 0010:rcu_note_context_switch+0x859/0x19c0
[ 42.663262][ T5683] Code: c1 ea 03 80 3c 02 00 0f 85 9b 0b 00 00 48 8b 53 28 b9 01 00 00 00 4c 89 ef e8 a3 cf fe ff e9 1d f9 ff ff 48 8d 3d 37 ac ed 0e <67> 48 0f b9 3a e9 99 f8 ff ff 48 b8 00 00 00 00 00 fc ff df 48 8d
[ 42.669316][ T5683] RSP: 0000:ffffc90003b37cf0 EFLAGS: 00010002
[ 42.671264][ T5683] RAX: 0000000000000001 RBX: ffff88802b33c3c0 RCX: ffffffff81ed2401
[ 42.673798][ T5683] RDX: 0000000000000000 RSI: ffffffff8c1c2080 RDI: ffffffff90db4460
[ 42.676318][ T5683] RBP: ffff88802214ca00 R08: 0000000000000000 R09: fffffbfff21af62a
[ 42.678853][ T5683] R10: ffffffff90d7b157 R11: 0000000000000001 R12: 0000000000000000
[ 42.681364][ T5683] R13: ffff88802214cec4 R14: ffff88802b33b380 R15: ffffffff90d7e4c4
[ 42.683910][ T5683] ? trace_rcu_utilization+0x31/0x240
[ 42.685667][ T5683] ? try_to_wake_up+0x5ec/0x1900
[ 42.687269][ T5683] ? rcu_is_watching+0x12/0xc0
[ 42.688827][ T5683] ? __schedule+0x32d5/0x6820
[ 42.690345][ T5683] ? rcu_is_watching+0x12/0xc0
[ 42.691896][ T5683] ? schedule+0xdd/0x390
[ 42.693296][ T5683] __schedule+0x276/0x6820
[ 42.694732][ T5683] ? __pfx_sched_clock_cpu+0x10/0x10
[ 42.696601][ T5683] ? irqtime_account_irq+0xc9/0x2d0
[ 42.698435][ T5683] ? __pfx___schedule+0x10/0x10
[ 42.700002][ T5683] ? trace_irq_enable.constprop.0+0x31/0x160
[ 42.701915][ T5683] schedule+0xdd/0x390
[ 42.703278][ T5683] irqentry_exit+0x359/0x790
[ 42.704786][ T5683] asm_sysvec_apic_timer_interrupt+0x1a/0x20
[ 42.706710][ T5683] RIP: 0033:0x7f95b8709feb
[ 42.708172][ T5683] Code: 08 48 8b 78 08 48 89 13 e8 5e f9 ff ff 97 e8 bb ff ff ff 48 09 e8 40 0f 95 c5 40 0f b6 ed eb 04 48 83 2b 08 48 95 5a 5b 5d c3 <55> 53 89 fb 48 83 ec 18 48 8b 3e 48 89 74 24 08 e8 a9 e7 f9 ff 80
[ 42.714259][ T5683] RSP: 002b:00007fff193633f8 EFLAGS: 00010287
[ 42.716222][ T5683] RAX: 00007f95b8754190 RBX: 0000564cf772e910 RCX: 0000000000000002
[ 42.718728][ T5683] RDX: 0000564cf772e910 RSI: 0000564cf7737120 RDI: 0000000000000004
[ 42.721242][ T5683] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000020
[ 42.723805][ T5683] R10: 0000000000000040 R11: 0000000000000000 R12: 0000564cf7736e50
[ 42.726321][ T5683] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
[ 42.728841][ T5683]
[ 42.730582][ T5683] Kernel Offset: disabled
[ 42.731984][ T5683] Rebooting in 86400 seconds..