[[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 '10.128.0.113' (ECDSA) to the list of known hosts.
2020/11/12 17:19:19 fuzzer started
2020/11/12 17:19:19 dialing manager at 10.128.0.105:43529
2020/11/12 17:19:19 syscalls: 3448
2020/11/12 17:19:19 code coverage: enabled
2020/11/12 17:19:19 comparison tracing: enabled
2020/11/12 17:19:19 extra coverage: enabled
2020/11/12 17:19:19 setuid sandbox: enabled
2020/11/12 17:19:19 namespace sandbox: enabled
2020/11/12 17:19:19 Android sandbox: /sys/fs/selinux/policy does not exist
2020/11/12 17:19:19 fault injection: enabled
2020/11/12 17:19:19 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/11/12 17:19:19 net packet injection: enabled
2020/11/12 17:19:19 net device setup: enabled
2020/11/12 17:19:19 concurrency sanitizer: enabled
2020/11/12 17:19:19 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/11/12 17:19:19 USB emulation: enabled
2020/11/12 17:19:19 hci packet injection: enabled
2020/11/12 17:19:19 wifi device emulation: enabled
2020/11/12 17:19:25 suppressing KCSAN reports in functions: 'do_sys_poll' 'lookup_fast' 'dd_has_work' 'blk_mq_sched_dispatch_requests' 'wbt_issue' 'shmem_getpage_gfp' 'tick_sched_timer' 'xas_find_marked' '__io_cqring_fill_event' 'dev_uevent' '__add_to_page_cache_locked' 'n_tty_receive_buf_common' 'ext4_mark_iloc_dirty' 'snd_rawmidi_poll' 'ondemand_readahead' 'file_remove_privs' '__delayacct_blkio_end' 'find_get_pages_range_tag' 'wbt_done' 'do_nanosleep' 'lru_add_drain_all' 'shmem_unlink' 'ext4_free_inodes_count' 'ext4_free_inode' 'ext4_writepages' '__writeback_single_inode' '__ext4_update_other_inode_time' 'do_select' 'blk_mq_do_dispatch_sched' 'expire_timers' 'snd_seq_check_queue' 'futex_wait_queue_me' 'evict' 'blk_mq_dispatch_rq_list' '__ext4_new_inode' 'blk_mq_rq_ctx_init' 'ext4_mb_regular_allocator' 'io_sq_thread' 'fsnotify' 'wg_packet_decrypt_worker' 'ext4_mb_good_group' 'complete_signal' '__btrfs_add_free_space' 'exit_mm' 'netlink_recvmsg' 'generic_file_buffered_read' 'wbt_wait' '__find_get_block' 'generic_write_end' 'pcpu_alloc' 'alloc_pid' 'audit_log_start' '__xa_clear_mark' 'do_signal_stop' 'kauditd_thread' '__send_signal'
syzkaller login: [ 72.925021][ C0] ==================================================================
[ 72.933293][ C0] BUG: KCSAN: data-race in virtqueue_enable_cb_delayed / virtqueue_enable_cb_prepare
[ 72.942929][ C0]
[ 72.945365][ C0] write to 0xffff888141f29370 of 2 bytes by task 8452 on cpu 1:
[ 72.953009][ C0] virtqueue_enable_cb_delayed+0x253/0x390
[ 72.959813][ C0] start_xmit+0xda/0xa80
[ 72.964059][ C0] xmit_one+0xf9/0x2e0
[ 72.968136][ C0] dev_hard_start_xmit+0x72/0x120
[ 72.973188][ C0] sch_direct_xmit+0x170/0x730
[ 72.978035][ C0] __qdisc_run+0x119/0x180
[ 72.982573][ C0] __dev_queue_xmit+0xa62/0x1510
[ 72.987860][ C0] dev_queue_xmit+0x13/0x20
[ 72.992355][ C0] ip_finish_output2+0xb09/0xba0
[ 72.997642][ C0] __ip_finish_output+0x3d8/0x430
[ 73.002685][ C0] ip_finish_output+0x39/0x160
[ 73.007544][ C0] ip_output+0xf6/0x1a0
[ 73.011735][ C0] __ip_queue_xmit+0x9ca/0x9f0
[ 73.016610][ C0] ip_queue_xmit+0x34/0x40
[ 73.021016][ C0] __tcp_transmit_skb+0x1250/0x1860
[ 73.026563][ C0] __tcp_send_ack+0x1e9/0x2e0
[ 73.031248][ C0] tcp_send_ack+0x23/0x30
[ 73.035597][ C0] tcp_cleanup_rbuf+0x1c4/0x310
[ 73.040466][ C0] tcp_recvmsg+0x1119/0x1c10
[ 73.045080][ C0] inet_recvmsg+0xa3/0x210
[ 73.049583][ C0] sock_read_iter+0x19e/0x1e0
[ 73.054340][ C0] vfs_read+0x552/0x5c0
[ 73.058495][ C0] ksys_read+0xce/0x180
[ 73.064048][ C0] __x64_sys_read+0x3e/0x50
[ 73.068549][ C0] do_syscall_64+0x39/0x80
[ 73.072967][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 73.078844][ C0]
[ 73.081168][ C0] read to 0xffff888141f29370 of 2 bytes by interrupt on cpu 0:
[ 73.088714][ C0] virtqueue_enable_cb_prepare+0x99/0x200
[ 73.094436][ C0] virtqueue_napi_complete+0x1b/0x80
[ 73.099744][ C0] virtnet_poll_tx+0x13d/0x1b0
[ 73.104505][ C0] napi_poll+0x178/0x4c0
[ 73.108749][ C0] net_rx_action+0x17a/0x480
[ 73.113336][ C0] __do_softirq+0x12c/0x2b1
[ 73.117835][ C0] asm_call_irq_on_stack+0xf/0x20
[ 73.122855][ C0] do_softirq_own_stack+0x32/0x40
[ 73.127862][ C0] __irq_exit_rcu+0xb2/0xc0
[ 73.132424][ C0] common_interrupt+0xb5/0x130
[ 73.137220][ C0] asm_common_interrupt+0x1e/0x40
[ 73.142560][ C0] acpi_idle_enter+0x25b/0x2e0
[ 73.147457][ C0] cpuidle_enter_state+0x2bd/0x750
[ 73.152704][ C0] cpuidle_enter+0x3c/0x60
[ 73.157120][ C0] do_idle+0x193/0x230
[ 73.161191][ C0] cpu_startup_entry+0x15/0x20
[ 73.165944][ C0] rest_init+0xd7/0xe0
[ 73.170009][ C0] arch_call_rest_init+0xa/0xb
[ 73.174868][ C0] start_kernel+0x5a0/0x625
[ 73.179604][ C0] secondary_startup_64_no_verify+0xb0/0xbb
[ 73.185483][ C0]
[ 73.187814][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 73.194082][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-rc3-syzkaller #0
[ 73.202994][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 73.213051][ C0] ==================================================================
[ 73.221116][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 73.227923][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-rc3-syzkaller #0
[ 73.236335][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 73.246562][ C0] Call Trace:
[ 73.249837][ C0]
[ 73.252692][ C0] dump_stack+0x116/0x15d
[ 73.257030][ C0] panic+0x1e7/0x5fa
[ 73.260919][ C0] ? vprintk_emit+0x2f2/0x370
[ 73.265596][ C0] kcsan_report+0x67b/0x680
[ 73.270099][ C0] ? kcsan_setup_watchpoint+0x46a/0x4d0
[ 73.275635][ C0] ? virtqueue_enable_cb_prepare+0x99/0x200
[ 73.281518][ C0] ? virtqueue_napi_complete+0x1b/0x80
[ 73.286976][ C0] ? virtnet_poll_tx+0x13d/0x1b0
[ 73.291912][ C0] ? napi_poll+0x178/0x4c0
[ 73.296320][ C0] ? net_rx_action+0x17a/0x480
[ 73.301173][ C0] ? __do_softirq+0x12c/0x2b1
[ 73.305847][ C0] ? asm_call_irq_on_stack+0xf/0x20
[ 73.311038][ C0] ? do_softirq_own_stack+0x32/0x40
[ 73.316380][ C0] ? __irq_exit_rcu+0xb2/0xc0
[ 73.321052][ C0] ? common_interrupt+0xb5/0x130
[ 73.326004][ C0] ? asm_common_interrupt+0x1e/0x40
[ 73.331729][ C0] ? acpi_idle_enter+0x25b/0x2e0
[ 73.336761][ C0] ? cpuidle_enter_state+0x2bd/0x750
[ 73.342048][ C0] ? cpuidle_enter+0x3c/0x60
[ 73.346646][ C0] ? do_idle+0x193/0x230
[ 73.350884][ C0] ? cpu_startup_entry+0x15/0x20
[ 73.355819][ C0] ? rest_init+0xd7/0xe0
[ 73.360089][ C0] ? arch_call_rest_init+0xa/0xb
[ 73.365019][ C0] ? start_kernel+0x5a0/0x625
[ 73.369687][ C0] ? secondary_startup_64_no_verify+0xb0/0xbb
[ 73.375934][ C0] ? ___cache_free+0x44/0x330
[ 73.380620][ C0] kcsan_setup_watchpoint+0x46a/0x4d0
[ 73.385972][ C0] ? __kfree_skb+0xfe/0x150
[ 73.390453][ C0] virtqueue_enable_cb_prepare+0x99/0x200
[ 73.396150][ C0] virtqueue_napi_complete+0x1b/0x80
[ 73.401518][ C0] virtnet_poll_tx+0x13d/0x1b0
[ 73.406291][ C0] napi_poll+0x178/0x4c0
[ 73.410609][ C0] net_rx_action+0x17a/0x480
[ 73.415194][ C0] __do_softirq+0x12c/0x2b1
[ 73.419701][ C0] asm_call_irq_on_stack+0xf/0x20
[ 73.424719][ C0]
[ 73.427666][ C0] do_softirq_own_stack+0x32/0x40
[ 73.432690][ C0] __irq_exit_rcu+0xb2/0xc0
[ 73.437202][ C0] common_interrupt+0xb5/0x130
[ 73.441967][ C0] asm_common_interrupt+0x1e/0x40
[ 73.446991][ C0] RIP: 0010:acpi_idle_enter+0x25b/0x2e0
[ 73.452536][ C0] Code: 48 8b 1b 48 89 de 48 83 e6 08 31 ff e8 ee 27 90 fe 48 83 e3 08 75 63 e9 0c 00 00 00 e8 2e 23 90 fe 0f 00 2d c1 e5 2a 03 fb f4 eb 59 49 8d 7c 24 04 e8 78 4c a0 fe 41 8b 54 24 04 ec 48 c7 c7
[ 73.472229][ C0] RSP: 0018:ffffffff86a03da8 EFLAGS: 00000246
[ 73.479167][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000008b
[ 73.487159][ C0] RDX: ffffffff86a30780 RSI: 0000000000000000 RDI: 0000000000000000
[ 73.495128][ C0] RBP: 0000000000000001 R08: ffffffff82b453b2 R09: ffffffff82b45373
[ 73.503097][ C0] R10: 0000000000000002 R11: ffffffff86a30780 R12: ffff88810188b464
[ 73.511090][ C0] R13: 0000000000000001 R14: 0000000000000001 R15: ffff88813bc00000
[ 73.519070][ C0] ? acpi_idle_enter+0x203/0x2e0
[ 73.524010][ C0] ? acpi_idle_enter+0x242/0x2e0
[ 73.529040][ C0] ? acpi_idle_enter+0x242/0x2e0
[ 73.533995][ C0] cpuidle_enter_state+0x2bd/0x750
[ 73.539102][ C0] ? __rcu_read_unlock+0x51/0x220
[ 73.544122][ C0] cpuidle_enter+0x3c/0x60
[ 73.548608][ C0] do_idle+0x193/0x230
[ 73.552762][ C0] cpu_startup_entry+0x15/0x20
[ 73.557613][ C0] rest_init+0xd7/0xe0
[ 73.561693][ C0] ? time_init+0xc/0xc
[ 73.565765][ C0] arch_call_rest_init+0xa/0xb
[ 73.570540][ C0] start_kernel+0x5a0/0x625
[ 73.575047][ C0] secondary_startup_64_no_verify+0xb0/0xbb
[ 73.581719][ C0] Kernel Offset: disabled
[ 73.586150][ C0] Rebooting in 86400 seconds..