last executing test programs:
kernel console output (not intermixed with test programs):
Warning: Permanently added '[localhost]:13576' (ED25519) to the list of known hosts.
[ 42.189168][ T5652] cgroup: Unknown subsys name 'net'
[ 42.357206][ T5652] cgroup: Unknown subsys name 'cpuset'
[ 42.363408][ T5652] cgroup: Unknown subsys name 'rlimit'
[ 42.545612][ T5700]
[ 42.546469][ T5700] ================================================
[ 42.548503][ T5700] WARNING: lock held when returning to user space!
[ 42.550535][ T5700] syzkaller #0 Not tainted
[ 42.551949][ T5700] ------------------------------------------------
[ 42.553973][ T5700] cmp/5700 is leaving the kernel with locks still held!
[ 42.556135][ T5700] 1 lock held by cmp/5700:
[ 42.557536][ T5700] #0: ffffffff8e7e52e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x2f/0x310
[ 42.560698][ T5700] ------------[ cut here ]------------
[ 42.562436][ T5700] Voluntary context switch within RCU read-side critical section!
[ 42.562442][ T5700] WARNING: kernel/rcu/tree_plugin.h:332 at rcu_note_context_switch+0x859/0x19c0, CPU#3: cmp/5700
[ 42.568130][ T5700] Modules linked in:
[ 42.569374][ T5700] CPU: 3 UID: 0 PID: 5700 Comm: cmp Not tainted syzkaller #0 PREEMPT(full)
[ 42.572089][ T5700] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 42.575237][ T5700] RIP: 0010:rcu_note_context_switch+0x859/0x19c0
[ 42.577231][ T5700] 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
[ 42.583201][ T5700] RSP: 0000:ffffc90003b7fcf0 EFLAGS: 00010002
[ 42.585105][ T5700] RAX: 0000000000000001 RBX: ffff88802b53c3c0 RCX: ffffffff81ed2401
[ 42.587602][ T5700] RDX: 0000000000000000 RSI: ffffffff8c1c2080 RDI: ffffffff90db4460
[ 42.590061][ T5700] RBP: ffff88802a368000 R08: 0000000000000000 R09: fffffbfff21af62a
[ 42.592554][ T5700] R10: ffffffff90d7b157 R11: 0000000000000003 R12: 0000000000000000
[ 42.595033][ T5700] R13: ffff88802a3684c4 R14: ffff88802b53b380 R15: ffffffff90d7e4c4
[ 42.597492][ T5700] FS: 00007f15be3a5c80(0000) GS:ffff888097480000(0000) knlGS:0000000000000000
[ 42.600292][ T5700] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 42.602382][ T5700] CR2: 00007f15be70c0f0 CR3: 000000004fb3c000 CR4: 0000000000352ef0
[ 42.604857][ T5700] Call Trace:
[ 42.605923][ T5700]
[ 42.606885][ T5700] ? try_to_wake_up+0x5ec/0x1900
[ 42.608475][ T5700] ? rcu_is_watching+0x12/0xc0
[ 42.609985][ T5700] ? __schedule+0x32d5/0x6820
[ 42.611501][ T5700] ? rcu_is_watching+0x12/0xc0
[ 42.613018][ T5700] ? schedule+0xdd/0x390
[ 42.614383][ T5700] __schedule+0x276/0x6820
[ 42.615798][ T5700] ? __pfx_sched_clock_cpu+0x10/0x10
[ 42.617515][ T5700] ? irqtime_account_irq+0xc9/0x2d0
[ 42.619173][ T5700] ? __pfx___schedule+0x10/0x10
[ 42.620706][ T5700] ? trace_irq_enable.constprop.0+0x31/0x160
[ 42.622645][ T5700] schedule+0xdd/0x390
[ 42.623945][ T5700] irqentry_exit+0x359/0x790
[ 42.625405][ T5700] asm_sysvec_apic_timer_interrupt+0x1a/0x20
[ 42.627369][ T5700] RIP: 0033:0x7f15be7278ec
[ 42.628775][ T5700] Code: 1f 80 00 00 00 00 48 8b 31 8b 51 08 4c 01 fe 48 83 fa 26 74 0a 48 83 fa 08 0f 85 ef 3c ff ff 48 8b 51 10 48 83 c1 18 4c 01 fa <48> 89 16 48 39 d9 72 d4 4d 8b 9a 08 02 00 00 4d 85 db 0f 84 ec 0b
[ 42.634770][ T5700] RSP: 002b:00007ffc356f6830 EFLAGS: 00010206
[ 42.636670][ T5700] RAX: 00007f15be64fcd0 RBX: 00007f15be659280 RCX: 00007f15be655d40
[ 42.639224][ T5700] RDX: 00007f15be65fa00 RSI: 00007f15be70c0f0 RDI: 00007f15be65d4c8
[ 42.641674][ T5700] RBP: 00007ffc356f6950 R08: 00007f15be65af90 R09: 00007f15be65d4c8
[ 42.644158][ T5700] R10: 00007f15be7100c0 R11: 0000000000000000 R12: 00007ffc356f68e0
[ 42.646629][ T5700] R13: 00007ffc356f68e0 R14: 00007f15be7100c0 R15: 00007f15be64e000
[ 42.649125][ T5700]
[ 42.650129][ T5700] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 42.652415][ T5700] CPU: 3 UID: 0 PID: 5700 Comm: cmp Not tainted syzkaller #0 PREEMPT(full)
[ 42.655122][ T5700] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 42.658299][ T5700] Call Trace:
[ 42.659369][ T5700]
[ 42.660296][ T5700] dump_stack_lvl+0x100/0x190
[ 42.661756][ T5700] vpanic+0x552/0x970
[ 42.663049][ T5700] ? __pfx_vpanic+0x10/0x10
[ 42.664493][ T5700] ? lock_release+0x245/0x310
[ 42.665982][ T5700] panic+0xd1/0xe0
[ 42.667247][ T5700] ? __pfx_panic+0x10/0x10
[ 42.668662][ T5700] ? check_panic_on_warn+0x1f/0x90
[ 42.670294][ T5700] check_panic_on_warn.cold+0x19/0x34
[ 42.671990][ T5700] ? rcu_note_context_switch+0x859/0x19c0
[ 42.673776][ T5700] __warn.cold+0x191/0x328
[ 42.675194][ T5700] __report_bug+0x296/0x3d0
[ 42.676633][ T5700] ? rcu_note_context_switch+0x859/0x19c0
[ 42.678456][ T5700] ? __pfx___report_bug+0x10/0x10
[ 42.680032][ T5700] ? __irq_exit_rcu+0x162/0x210
[ 42.681570][ T5700] ? irq_exit_rcu+0x9/0x30
[ 42.683000][ T5700] ? sysvec_apic_timer_interrupt+0x56/0xc0
[ 42.684833][ T5700] ? trace_rcu_utilization+0x31/0x240
[ 42.686538][ T5700] ? rcu_is_watching+0x12/0xc0
[ 42.688065][ T5700] ? trace_pelt_se_tp+0x13b/0x190
[ 42.689649][ T5700] report_bug_entry+0xe1/0x290
[ 42.691185][ T5700] ? rcu_note_context_switch+0x859/0x19c0
[ 42.692966][ T5700] handle_bug+0x1cd/0x2a0
[ 42.694327][ T5700] exc_invalid_op+0x17/0x50
[ 42.695758][ T5700] asm_exc_invalid_op+0x1a/0x20
[ 42.697327][ T5700] RIP: 0010:rcu_note_context_switch+0x859/0x19c0
[ 42.699327][ T5700] 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
[ 42.705303][ T5700] RSP: 0000:ffffc90003b7fcf0 EFLAGS: 00010002
[ 42.707245][ T5700] RAX: 0000000000000001 RBX: ffff88802b53c3c0 RCX: ffffffff81ed2401
[ 42.709703][ T5700] RDX: 0000000000000000 RSI: ffffffff8c1c2080 RDI: ffffffff90db4460
[ 42.712190][ T5700] RBP: ffff88802a368000 R08: 0000000000000000 R09: fffffbfff21af62a
[ 42.714659][ T5700] R10: ffffffff90d7b157 R11: 0000000000000003 R12: 0000000000000000
[ 42.717124][ T5700] R13: ffff88802a3684c4 R14: ffff88802b53b380 R15: ffffffff90d7e4c4
[ 42.719593][ T5700] ? trace_rcu_utilization+0x31/0x240
[ 42.721283][ T5700] ? try_to_wake_up+0x5ec/0x1900
[ 42.722857][ T5700] ? rcu_is_watching+0x12/0xc0
[ 42.724372][ T5700] ? __schedule+0x32d5/0x6820
[ 42.725855][ T5700] ? rcu_is_watching+0x12/0xc0
[ 42.727393][ T5700] ? schedule+0xdd/0x390
[ 42.728732][ T5700] __schedule+0x276/0x6820
[ 42.730123][ T5700] ? __pfx_sched_clock_cpu+0x10/0x10
[ 42.731776][ T5700] ? irqtime_account_irq+0xc9/0x2d0
[ 42.733403][ T5700] ? __pfx___schedule+0x10/0x10
[ 42.734951][ T5700] ? trace_irq_enable.constprop.0+0x31/0x160
[ 42.736830][ T5700] schedule+0xdd/0x390
[ 42.738161][ T5700] irqentry_exit+0x359/0x790
[ 42.739630][ T5700] asm_sysvec_apic_timer_interrupt+0x1a/0x20
[ 42.741505][ T5700] RIP: 0033:0x7f15be7278ec
[ 42.742934][ T5700] Code: 1f 80 00 00 00 00 48 8b 31 8b 51 08 4c 01 fe 48 83 fa 26 74 0a 48 83 fa 08 0f 85 ef 3c ff ff 48 8b 51 10 48 83 c1 18 4c 01 fa <48> 89 16 48 39 d9 72 d4 4d 8b 9a 08 02 00 00 4d 85 db 0f 84 ec 0b
[ 42.748919][ T5700] RSP: 002b:00007ffc356f6830 EFLAGS: 00010206
[ 42.750840][ T5700] RAX: 00007f15be64fcd0 RBX: 00007f15be659280 RCX: 00007f15be655d40
[ 42.753309][ T5700] RDX: 00007f15be65fa00 RSI: 00007f15be70c0f0 RDI: 00007f15be65d4c8
[ 42.755773][ T5700] RBP: 00007ffc356f6950 R08: 00007f15be65af90 R09: 00007f15be65d4c8
[ 42.758124][ T5700] R10: 00007f15be7100c0 R11: 0000000000000000 R12: 00007ffc356f68e0
[ 42.760591][ T5700] R13: 00007ffc356f68e0 R14: 00007f15be7100c0 R15: 00007f15be64e000
[ 42.763068][ T5700]
[ 42.764634][ T5700] Kernel Offset: disabled
[ 42.765994][ T5700] Rebooting in 86400 seconds..