[[0;32m OK [0m] Reached target Login Prompts.
[[0;32m OK [0m] Reached target Multi-User System.
[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.112' (ECDSA) to the list of known hosts.
2020/07/08 07:26:01 fuzzer started
2020/07/08 07:26:02 dialing manager at 10.128.0.105:36183
2020/07/08 07:26:02 syscalls: 3114
2020/07/08 07:26:02 code coverage: enabled
2020/07/08 07:26:02 comparison tracing: enabled
2020/07/08 07:26:02 extra coverage: enabled
2020/07/08 07:26:02 setuid sandbox: enabled
2020/07/08 07:26:02 namespace sandbox: enabled
2020/07/08 07:26:02 Android sandbox: /sys/fs/selinux/policy does not exist
2020/07/08 07:26:02 fault injection: enabled
2020/07/08 07:26:02 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/07/08 07:26:02 net packet injection: enabled
2020/07/08 07:26:02 net device setup: enabled
2020/07/08 07:26:02 concurrency sanitizer: enabled
2020/07/08 07:26:02 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/07/08 07:26:02 USB emulation: enabled
2020/07/08 07:26:02 suppressing KCSAN reports in functions: 'io_sq_thread' '__xa_clear_mark' 'generic_write_end' 'do_epoll_wait' 'ext4_free_inode' '__delayacct_blkio_end'
syzkaller login: [ 32.738091][ C0] ==================================================================
[ 32.746165][ C0] BUG: KCSAN: data-race in add_timer_on / timer_clear_idle
[ 32.753322][ C0]
[ 32.755629][ C0] write to 0xffff88812c11cb24 of 1 bytes by task 0 on cpu 1:
[ 32.762974][ C0] timer_clear_idle+0x2e/0x40
[ 32.767615][ C0] tick_nohz_idle_retain_tick+0x3e/0x40
[ 32.773125][ C0] do_idle+0x287/0x310
[ 32.777158][ C0] cpu_startup_entry+0x15/0x20
[ 32.781888][ C0] start_secondary+0xe3/0x110
[ 32.786530][ C0] secondary_startup_64+0xa4/0xb0
[ 32.791517][ C0]
[ 32.793814][ C0] read to 0xffff88812c11cb24 of 1 bytes by interrupt on cpu 0:
[ 32.801446][ C0] add_timer_on+0x218/0x360
[ 32.805915][ C0] clocksource_watchdog+0x729/0x760
[ 32.811078][ C0] call_timer_fn+0x30/0x2a0
[ 32.815544][ C0] expire_timers+0x116/0x290
[ 32.820098][ C0] __run_timers+0x443/0x500
[ 32.824564][ C0] run_timer_softirq+0x2e/0x60
[ 32.829290][ C0] __do_softirq+0x198/0x360
[ 32.833760][ C0] asm_call_on_stack+0xf/0x20
[ 32.838407][ C0] do_softirq_own_stack+0x5d/0x80
[ 32.843399][ C0] __irq_exit_rcu+0x115/0x120
[ 32.848040][ C0] sysvec_apic_timer_interrupt+0xba/0xd0
[ 32.853642][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20
[ 32.859598][ C0] native_safe_halt+0xe/0x10
[ 32.864153][ C0] acpi_idle_enter+0x2ff/0x680
[ 32.868890][ C0] cpuidle_enter_state+0x245/0x5d0
[ 32.873964][ C0] cpuidle_enter+0x3c/0x60
[ 32.878346][ C0] do_idle+0x229/0x310
[ 32.882390][ C0] cpu_startup_entry+0x15/0x20
[ 32.887118][ C0] rest_init+0xd8/0xe0
[ 32.891152][ C0] arch_call_rest_init+0xa/0xb
[ 32.895878][ C0] start_kernel+0x608/0x6d0
[ 32.900431][ C0] secondary_startup_64+0xa4/0xb0
[ 32.905426][ C0]
[ 32.907735][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 32.913858][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.8.0-rc4-syzkaller #0
[ 32.921712][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 32.932084][ C0] ==================================================================
[ 32.940110][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 32.946663][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.8.0-rc4-syzkaller #0
[ 32.954514][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 32.964561][ C0] Call Trace:
[ 32.967812][ C0]
[ 32.970637][ C0] dump_stack+0x10f/0x19d
[ 32.974951][ C0] panic+0x207/0x64a
[ 32.978815][ C0] ? vprintk_emit+0x44a/0x4f0
[ 32.983456][ C0] kcsan_report+0x684/0x690
[ 32.987924][ C0] ? kcsan_setup_watchpoint+0x453/0x4d0
[ 32.993432][ C0] ? add_timer_on+0x218/0x360
[ 32.998084][ C0] ? clocksource_watchdog+0x729/0x760
[ 33.003420][ C0] ? call_timer_fn+0x30/0x2a0
[ 33.008060][ C0] ? expire_timers+0x116/0x290
[ 33.012787][ C0] ? __run_timers+0x443/0x500
[ 33.017430][ C0] ? run_timer_softirq+0x2e/0x60
[ 33.022330][ C0] ? __do_softirq+0x198/0x360
[ 33.027071][ C0] ? asm_call_on_stack+0xf/0x20
[ 33.031897][ C0] ? do_softirq_own_stack+0x5d/0x80
[ 33.037062][ C0] ? __irq_exit_rcu+0x115/0x120
[ 33.041888][ C0] ? sysvec_apic_timer_interrupt+0xba/0xd0
[ 33.047662][ C0] ? asm_sysvec_apic_timer_interrupt+0x12/0x20
[ 33.053797][ C0] ? native_safe_halt+0xe/0x10
[ 33.058527][ C0] ? acpi_idle_enter+0x2ff/0x680
[ 33.063434][ C0] ? cpuidle_enter_state+0x245/0x5d0
[ 33.068687][ C0] ? cpuidle_enter+0x3c/0x60
[ 33.073245][ C0] ? do_idle+0x229/0x310
[ 33.077454][ C0] ? cpu_startup_entry+0x15/0x20
[ 33.082356][ C0] ? rest_init+0xd8/0xe0
[ 33.086566][ C0] ? arch_call_rest_init+0xa/0xb
[ 33.091467][ C0] ? start_kernel+0x608/0x6d0
[ 33.096108][ C0] ? secondary_startup_64+0xa4/0xb0
[ 33.101276][ C0] kcsan_setup_watchpoint+0x453/0x4d0
[ 33.106647][ C0] add_timer_on+0x218/0x360
[ 33.111123][ C0] clocksource_watchdog+0x729/0x760
[ 33.116287][ C0] ? __clocksource_select+0x340/0x340
[ 33.121619][ C0] call_timer_fn+0x30/0x2a0
[ 33.126087][ C0] ? __clocksource_select+0x340/0x340
[ 33.131422][ C0] expire_timers+0x116/0x290
[ 33.135975][ C0] __run_timers+0x443/0x500
[ 33.140446][ C0] ? kvm_sched_clock_read+0x15/0x40
[ 33.145608][ C0] run_timer_softirq+0x2e/0x60
[ 33.150372][ C0] __do_softirq+0x198/0x360
[ 33.154843][ C0] asm_call_on_stack+0xf/0x20
[ 33.159483][ C0]
[ 33.162390][ C0] do_softirq_own_stack+0x5d/0x80
[ 33.167379][ C0] __irq_exit_rcu+0x115/0x120
[ 33.172019][ C0] sysvec_apic_timer_interrupt+0xba/0xd0
[ 33.177626][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20
[ 33.183570][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 33.188905][ C0] Code: 75 0a e8 45 2c 53 fb e9 03 ff ff ff e8 3b 2c 53 fb e9 6d ff ff ff cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d a4 c8 4d 00 fb f4 90 e9 07 00 00 00 0f 00 2d 94 c8 4d 00 f4 c3 cc cc 65 48 8b 04
[ 33.208471][ C0] RSP: 0018:ffffffff87a03d98 EFLAGS: 00000286
[ 33.214503][ C0] RAX: ffffffff87a2d118 RBX: 0000000000000000 RCX: 000000000000013b
[ 33.222442][ C0] RDX: 0000ffff87a61ef8 RSI: 0000000000000000 RDI: ffffffff87a61ef8
[ 33.230392][ C0] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000ffff87a61eff
[ 33.238329][ C0] R10: 0000000000000002 R11: ffffffff87a2c700 R12: 0000000000000001
[ 33.246264][ C0] R13: ffff88812a640004 R14: 0000000000000001 R15: ffff88812aad0270
[ 33.254208][ C0] acpi_idle_enter+0x2ff/0x680
[ 33.258937][ C0] cpuidle_enter_state+0x245/0x5d0
[ 33.264013][ C0] cpuidle_enter+0x3c/0x60
[ 33.268397][ C0] do_idle+0x229/0x310
[ 33.272443][ C0] cpu_startup_entry+0x15/0x20
[ 33.277171][ C0] rest_init+0xd8/0xe0
[ 33.281203][ C0] ? time_init+0xc/0xc
[ 33.285235][ C0] arch_call_rest_init+0xa/0xb
[ 33.289962][ C0] start_kernel+0x608/0x6d0
[ 33.294431][ C0] secondary_startup_64+0xa4/0xb0
[ 34.413409][ C0] Shutting down cpus with NMI
[ 34.419335][ C0] Kernel Offset: disabled
[ 34.423677][ C0] Rebooting in 86400 seconds..