[[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 '10.128.10.15' (ECDSA) to the list of known hosts.
2020/09/30 00:51:36 fuzzer started
2020/09/30 00:51:36 dialing manager at 10.128.0.105:34755
2020/09/30 00:51:37 syscalls: 3358
2020/09/30 00:51:37 code coverage: enabled
2020/09/30 00:51:37 comparison tracing: enabled
2020/09/30 00:51:37 extra coverage: enabled
2020/09/30 00:51:37 setuid sandbox: enabled
2020/09/30 00:51:37 namespace sandbox: enabled
2020/09/30 00:51:37 Android sandbox: /sys/fs/selinux/policy does not exist
2020/09/30 00:51:37 fault injection: enabled
2020/09/30 00:51:37 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/09/30 00:51:37 net packet injection: enabled
2020/09/30 00:51:37 net device setup: enabled
2020/09/30 00:51:37 concurrency sanitizer: enabled
2020/09/30 00:51:37 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/09/30 00:51:37 USB emulation: enabled
2020/09/30 00:51:37 hci packet injection: enabled
2020/09/30 00:51:37 wifi device emulation: enabled
2020/09/30 00:51:41 suppressing KCSAN reports in functions: 'xas_clear_mark' 'step_into' 'futex_wait_queue_me' 'dd_has_work' 'ext4_mb_good_group' 'snd_rawmidi_kernel_write1' '__find_get_block' 'tick_sched_timer' 'do_readlinkat' '__ptrace_unlink' 'audit_log_start' 'blk_mq_request_bypass_insert' 'generic_write_end' 'exit_mm' 'generic_file_buffered_read' 'tick_nohz_next_event' '__delayacct_blkio_end' 'do_nanosleep' 'ext4_mark_iloc_dirty' 'do_sys_poll' 'shmem_mknod' 'wbt_done' '__writeback_single_inode' 'lru_add_drain_all' 'wg_packet_decrypt_worker' 'filemap_map_pages' 'ext4_free_inode' '__filemap_fdatawrite_range' 'ext4_free_inodes_count' 'blk_mq_dispatch_rq_list' 'xas_find_marked' 'wbt_issue' '__add_to_page_cache_locked' '__blkdev_put' 'snd_rawmidi_transmit' 'snd_rawmidi_poll' 'kauditd_thread' 'pcpu_alloc' 'ext4_alloc_da_blocks' 'alloc_pid' 'blk_mq_sched_dispatch_requests' 'do_syslog' 'do_select' 'shmem_add_to_page_cache' '__ext4_new_inode' 'ext4_writepages' 'inc_node_page_state' 'blk_mq_rq_ctx_init' 'wbt_wait' 'dput' '__mark_inode_dirty' 'mm_update_next_owner' 'find_get_pages_range_tag' 'n_tty_receive_buf_common' 'ext4_mb_regular_allocator' 'get_cpu_idle_time_us' '__xa_clear_mark' 'expire_timers'
syzkaller login: [ 91.586824][ C0] ==================================================================
[ 91.594902][ C0] BUG: KCSAN: data-race in __mod_timer / timer_clear_idle
[ 91.601978][ C0]
[ 91.604278][ C0] write to 0xffff88812c11cb25 of 1 bytes by task 0 on cpu 1:
[ 91.611614][ C0] timer_clear_idle+0x2e/0x40
[ 91.616275][ C0] __tick_nohz_idle_restart_tick+0x20/0x190
[ 91.622179][ C0] tick_nohz_idle_exit+0x13c/0x290
[ 91.627257][ C0] do_idle+0x280/0x2c0
[ 91.631292][ C0] cpu_startup_entry+0x15/0x20
[ 91.636028][ C0] secondary_startup_64+0xa4/0xb0
[ 91.641017][ C0]
[ 91.643362][ C0] read to 0xffff88812c11cb25 of 1 bytes by interrupt on cpu 0:
[ 91.650881][ C0] __mod_timer+0x892/0xc90
[ 91.655271][ C0] mod_timer+0x1b/0x20
[ 91.659315][ C0] sk_reset_timer+0x1f/0xa0
[ 91.663790][ C0] tcp_send_delayed_ack+0x191/0x250
[ 91.669005][ C0] __tcp_ack_snd_check+0x313/0x530
[ 91.674092][ C0] tcp_rcv_established+0xb3e/0x1520
[ 91.679261][ C0] tcp_v4_do_rcv+0x25e/0x480
[ 91.683831][ C0] tcp_v4_rcv+0x219b/0x2420
[ 91.688303][ C0] ip_protocol_deliver_rcu+0x1f9/0x400
[ 91.693767][ C0] ip_local_deliver+0x1d6/0x2a0
[ 91.698627][ C0] ip_sublist_rcv+0x4d4/0x5a0
[ 91.703269][ C0] ip_list_rcv+0x262/0x290
[ 91.707653][ C0] __netif_receive_skb_list_core+0x34b/0x450
[ 91.713600][ C0] __netif_receive_skb_list+0x298/0x310
[ 91.719113][ C0] netif_receive_skb_list_internal+0xda/0x330
[ 91.725147][ C0] napi_complete_done+0x1a1/0x3c0
[ 91.730184][ C0] virtqueue_napi_complete+0x28/0x80
[ 91.735438][ C0] virtnet_poll+0x64f/0x780
[ 91.739909][ C0] napi_poll+0x178/0x4f0
[ 91.744120][ C0] net_rx_action+0x1ba/0x530
[ 91.748678][ C0] __do_softirq+0x198/0x360
[ 91.753148][ C0] asm_call_irq_on_stack+0xf/0x20
[ 91.758138][ C0] do_softirq_own_stack+0x5b/0x70
[ 91.763564][ C0] __irq_exit_rcu+0x115/0x120
[ 91.768235][ C0] common_interrupt+0x14e/0x1e0
[ 91.773067][ C0] asm_common_interrupt+0x1e/0x40
[ 91.778059][ C0] native_safe_halt+0xe/0x10
[ 91.782630][ C0] acpi_idle_do_entry+0x94/0x120
[ 91.787537][ C0] acpi_idle_enter+0x22e/0x260
[ 91.792270][ C0] cpuidle_enter_state+0x2ba/0x840
[ 91.797370][ C0] cpuidle_enter+0x3c/0x60
[ 91.801771][ C0] do_idle+0x1e7/0x2c0
[ 91.805814][ C0] cpu_startup_entry+0x15/0x20
[ 91.810548][ C0] rest_init+0xd8/0xe0
[ 91.814587][ C0] arch_call_rest_init+0xa/0xb
[ 91.819322][ C0] start_kernel+0x608/0x6d0
[ 91.823797][ C0] secondary_startup_64+0xa4/0xb0
[ 91.828786][ C0]
[ 91.831085][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 91.837207][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.9.0-rc7-syzkaller #0
[ 91.845148][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 91.855189][ C0] ==================================================================
[ 91.863218][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 91.869772][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.9.0-rc7-syzkaller #0
[ 91.877628][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 91.887650][ C0] Call Trace:
[ 91.890906][ C0]
[ 91.893732][ C0] dump_stack+0x10f/0x19d
[ 91.898030][ C0] panic+0x207/0x64a
[ 91.901895][ C0] ? vprintk_emit+0x44a/0x4f0
[ 91.906546][ C0] kcsan_report+0x684/0x690
[ 91.911027][ C0] ? kcsan_setup_watchpoint+0x41e/0x4a0
[ 91.916541][ C0] ? __mod_timer+0x892/0xc90
[ 91.921099][ C0] ? mod_timer+0x1b/0x20
[ 91.925329][ C0] ? sk_reset_timer+0x1f/0xa0
[ 91.929977][ C0] ? tcp_send_delayed_ack+0x191/0x250
[ 91.935324][ C0] ? __tcp_ack_snd_check+0x313/0x530
[ 91.940580][ C0] ? tcp_rcv_established+0xb3e/0x1520
[ 91.945923][ C0] ? tcp_v4_do_rcv+0x25e/0x480
[ 91.950657][ C0] ? tcp_v4_rcv+0x219b/0x2420
[ 91.955306][ C0] ? ip_protocol_deliver_rcu+0x1f9/0x400
[ 91.960924][ C0] ? ip_local_deliver+0x1d6/0x2a0
[ 91.965920][ C0] ? ip_sublist_rcv+0x4d4/0x5a0
[ 91.970759][ C0] ? ip_list_rcv+0x262/0x290
[ 91.975333][ C0] ? __netif_receive_skb_list_core+0x34b/0x450
[ 91.981457][ C0] ? __netif_receive_skb_list+0x298/0x310
[ 91.987144][ C0] ? netif_receive_skb_list_internal+0xda/0x330
[ 91.993352][ C0] ? napi_complete_done+0x1a1/0x3c0
[ 91.998519][ C0] ? virtqueue_napi_complete+0x28/0x80
[ 92.003945][ C0] ? virtnet_poll+0x64f/0x780
[ 92.008591][ C0] ? napi_poll+0x178/0x4f0
[ 92.012974][ C0] ? net_rx_action+0x1ba/0x530
[ 92.017710][ C0] ? __do_softirq+0x198/0x360
[ 92.022355][ C0] ? asm_call_irq_on_stack+0xf/0x20
[ 92.027521][ C0] ? do_softirq_own_stack+0x5b/0x70
[ 92.032691][ C0] ? __irq_exit_rcu+0x115/0x120
[ 92.037510][ C0] ? common_interrupt+0x14e/0x1e0
[ 92.042502][ C0] ? asm_common_interrupt+0x1e/0x40
[ 92.047668][ C0] ? native_safe_halt+0xe/0x10
[ 92.052399][ C0] ? acpi_idle_do_entry+0x94/0x120
[ 92.057480][ C0] ? acpi_idle_enter+0x22e/0x260
[ 92.062386][ C0] ? cpuidle_enter_state+0x2ba/0x840
[ 92.067656][ C0] ? cpuidle_enter+0x3c/0x60
[ 92.072213][ C0] ? do_idle+0x1e7/0x2c0
[ 92.076443][ C0] ? cpu_startup_entry+0x15/0x20
[ 92.081347][ C0] ? rest_init+0xd8/0xe0
[ 92.085566][ C0] ? arch_call_rest_init+0xa/0xb
[ 92.090473][ C0] ? start_kernel+0x608/0x6d0
[ 92.095153][ C0] ? secondary_startup_64+0xa4/0xb0
[ 92.100323][ C0] ? _raw_read_unlock_irqrestore+0x37/0x50
[ 92.106102][ C0] kcsan_setup_watchpoint+0x41e/0x4a0
[ 92.111460][ C0] __mod_timer+0x892/0xc90
[ 92.115850][ C0] mod_timer+0x1b/0x20
[ 92.119911][ C0] sk_reset_timer+0x1f/0xa0
[ 92.124384][ C0] tcp_send_delayed_ack+0x191/0x250
[ 92.129552][ C0] __tcp_ack_snd_check+0x313/0x530
[ 92.134632][ C0] tcp_rcv_established+0xb3e/0x1520
[ 92.139815][ C0] tcp_v4_do_rcv+0x25e/0x480
[ 92.144374][ C0] tcp_v4_rcv+0x219b/0x2420
[ 92.148870][ C0] ip_protocol_deliver_rcu+0x1f9/0x400
[ 92.154302][ C0] ip_local_deliver+0x1d6/0x2a0
[ 92.159137][ C0] ? ip_local_deliver+0x2a0/0x2a0
[ 92.164136][ C0] ip_sublist_rcv+0x4d4/0x5a0
[ 92.168938][ C0] ? ip_rcv_core+0x600/0x600
[ 92.173549][ C0] ip_list_rcv+0x262/0x290
[ 92.177939][ C0] ? ip_rcv_finish+0x160/0x160
[ 92.182675][ C0] __netif_receive_skb_list_core+0x34b/0x450
[ 92.188626][ C0] __netif_receive_skb_list+0x298/0x310
[ 92.194141][ C0] netif_receive_skb_list_internal+0xda/0x330
[ 92.200180][ C0] napi_complete_done+0x1a1/0x3c0
[ 92.205180][ C0] virtqueue_napi_complete+0x28/0x80
[ 92.210455][ C0] virtnet_poll+0x64f/0x780
[ 92.214932][ C0] napi_poll+0x178/0x4f0
[ 92.219146][ C0] net_rx_action+0x1ba/0x530
[ 92.223715][ C0] __do_softirq+0x198/0x360
[ 92.228189][ C0] ? handle_edge_irq+0x52f/0x5f0
[ 92.233115][ C0] ? handle_fasteoi_nmi+0x290/0x290
[ 92.238283][ C0] asm_call_irq_on_stack+0xf/0x20
[ 92.243273][ C0]
[ 92.246183][ C0] do_softirq_own_stack+0x5b/0x70
[ 92.251185][ C0] __irq_exit_rcu+0x115/0x120
[ 92.255833][ C0] common_interrupt+0x14e/0x1e0
[ 92.260657][ C0] asm_common_interrupt+0x1e/0x40
[ 92.265670][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 92.271068][ C0] Code: 44 fb 48 83 e5 08 75 0a e8 bf b0 44 fb e9 0d ff ff ff e8 b5 b0 44 fb e9 77 ff ff ff e9 07 00 00 00 0f 00 2d d4 f7 5e 00 fb f4 90 e9 07 00 00 00 0f 00 2d c4 f7 5e 00 f4 c3 cc cc 41 56 53 65
[ 92.290645][ C0] RSP: 0018:ffffffff87c03d98 EFLAGS: 00000282
[ 92.296683][ C0] RAX: ffffffff87c320f0 RBX: 0000000000000000 RCX: 00000000000003d9
[ 92.304676][ C0] RDX: 0000ffff87c67dc0 RSI: 0000000000000000 RDI: ffffffff87c67dc0
[ 92.312626][ C0] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000ffff87c67dc7
[ 92.320595][ C0] R10: 0000000000000002 R11: ffffffff87c316c0 R12: ffff88821b14b404
[ 92.328542][ C0] R13: ffff88821b72ec64 R14: ffff88821b72ec64 R15: 0000000000000001
[ 92.336505][ C0] acpi_idle_do_entry+0x94/0x120
[ 92.341421][ C0] acpi_idle_enter+0x22e/0x260
[ 92.346161][ C0] ? rcu_dynticks_eqs_enter+0x9/0x40
[ 92.351422][ C0] cpuidle_enter_state+0x2ba/0x840
[ 92.356507][ C0] cpuidle_enter+0x3c/0x60
[ 92.360897][ C0] do_idle+0x1e7/0x2c0
[ 92.365058][ C0] cpu_startup_entry+0x15/0x20
[ 92.369806][ C0] rest_init+0xd8/0xe0
[ 92.373849][ C0] ? time_init+0xc/0xc
[ 92.377889][ C0] arch_call_rest_init+0xa/0xb
[ 92.382627][ C0] start_kernel+0x608/0x6d0
[ 92.387105][ C0] secondary_startup_64+0xa4/0xb0
[ 92.393427][ C0] Kernel Offset: disabled
[ 92.397739][ C0] Rebooting in 86400 seconds..