[[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 '10.128.1.52' (ECDSA) to the list of known hosts.
2020/11/18 03:06:02 fuzzer started
2020/11/18 03:06:02 dialing manager at 10.128.0.105:32841
2020/11/18 03:06:03 syscalls: 3448
2020/11/18 03:06:03 code coverage: enabled
2020/11/18 03:06:03 comparison tracing: enabled
2020/11/18 03:06:03 extra coverage: enabled
2020/11/18 03:06:03 setuid sandbox: enabled
2020/11/18 03:06:03 namespace sandbox: enabled
2020/11/18 03:06:03 Android sandbox: /sys/fs/selinux/policy does not exist
2020/11/18 03:06:03 fault injection: enabled
2020/11/18 03:06:03 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/11/18 03:06:03 net packet injection: enabled
2020/11/18 03:06:03 net device setup: enabled
2020/11/18 03:06:03 concurrency sanitizer: enabled
2020/11/18 03:06:03 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/11/18 03:06:03 USB emulation: enabled
2020/11/18 03:06:03 hci packet injection: enabled
2020/11/18 03:06:03 wifi device emulation: enabled
2020/11/18 03:06:09 suppressing KCSAN reports in functions: 'ext4_writepages' '__ext4_new_inode' 'do_nanosleep' 'expire_timers' 'lru_add_drain_all' 'io_sq_thread' 'do_sys_poll' '__filemap_fdatawrite_range' 'snd_rawmidi_poll' 'do_select' '__writeback_single_inode' '_prb_read_valid' 'tomoyo_supervisor' 'tick_nohz_next_event' 'n_tty_receive_buf_common' 'ext4_sync_file' '__send_signal' 'ext4_mb_good_group' 'lbmIODone' '__xa_clear_mark' 'alloc_pid' 'kauditd_thread' 'wg_packet_decrypt_worker' 'do_signal_stop' '__delayacct_blkio_end' 'exit_signals' 'atime_needs_update' 'filemap_map_pages' 'generic_file_buffered_read' 'ext4_ext_insert_extent' 'ext4_free_inodes_count' 'shmem_mknod' 'xas_clear_mark' '__fsnotify_parent' 'generic_write_end' 'blk_mq_sched_dispatch_requests' 'find_get_pages_range_tag' 'ext4_mb_regular_allocator' '__add_to_page_cache_locked' 'wbt_issue' 'pcpu_alloc' '__mark_inode_dirty' 'tcp_disconnect' '__io_cqring_fill_event' 'dd_has_work' 'blk_mq_rq_ctx_init' 'snd_rawmidi_kernel_write1' 'internal_add_timer' 'dput' 'ext4_mb_find_by_goal' 'blk_mq_dispatch_rq_list' 'n_tty_receive_char_inline' 'step_into' 'complete_signal' 'ext4_mark_iloc_dirty' '__mod_timer' 'audit_log_start' '__xa_set_mark' 'snd_rawmidi_transmit' 'ext4_free_inode' 'futex_wait_queue_me' 'exit_mm'
syzkaller login: [ 97.256571][ C1] ==================================================================
[ 97.264691][ C1] BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_enable_cb_delayed
[ 97.273651][ C1]
[ 97.275983][ C1] write to 0xffff888141f5c730 of 2 bytes by task 8457 on cpu 0:
[ 97.283619][ C1] virtqueue_enable_cb_delayed+0x253/0x390
[ 97.289812][ C1] start_xmit+0xda/0xa80
[ 97.294057][ C1] xmit_one+0xf9/0x2e0
[ 97.298166][ C1] dev_hard_start_xmit+0x72/0x120
[ 97.303189][ C1] sch_direct_xmit+0x170/0x730
[ 97.307982][ C1] __qdisc_run+0x119/0x180
[ 97.312402][ C1] __dev_queue_xmit+0xa62/0x1510
[ 97.317341][ C1] dev_queue_xmit+0x13/0x20
[ 97.322003][ C1] ip_finish_output2+0xb09/0xba0
[ 97.326965][ C1] __ip_finish_output+0x3d8/0x430
[ 97.332161][ C1] ip_finish_output+0x39/0x160
[ 97.336936][ C1] ip_output+0xf6/0x1a0
[ 97.341117][ C1] __ip_queue_xmit+0x9ca/0x9f0
[ 97.346532][ C1] ip_queue_xmit+0x34/0x40
[ 97.350956][ C1] __tcp_transmit_skb+0x1250/0x1860
[ 97.356147][ C1] __tcp_send_ack+0x1e9/0x2e0
[ 97.360813][ C1] tcp_send_ack+0x23/0x30
[ 97.365144][ C1] tcp_cleanup_rbuf+0x1c4/0x310
[ 97.369996][ C1] tcp_recvmsg+0x1119/0x1c10
[ 97.374587][ C1] inet_recvmsg+0xa3/0x210
[ 97.379004][ C1] sock_read_iter+0x19e/0x1e0
[ 97.383689][ C1] vfs_read+0x552/0x5c0
[ 97.387860][ C1] ksys_read+0xce/0x180
[ 97.392031][ C1] __x64_sys_read+0x3e/0x50
[ 97.396553][ C1] do_syscall_64+0x39/0x80
[ 97.401000][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 97.406875][ C1]
[ 97.409202][ C1] read to 0xffff888141f5c730 of 2 bytes by interrupt on cpu 1:
[ 97.416747][ C1] virtqueue_disable_cb+0x66/0x120
[ 97.421895][ C1] skb_xmit_done+0xa5/0x110
[ 97.426394][ C1] vring_interrupt+0x11e/0x140
[ 97.431242][ C1] __handle_irq_event_percpu+0x93/0x450
[ 97.437219][ C1] handle_irq_event+0x81/0x120
[ 97.441984][ C1] handle_edge_irq+0x16e/0x590
[ 97.446772][ C1] asm_call_irq_on_stack+0xf/0x20
[ 97.451792][ C1] common_interrupt+0x8e/0x130
[ 97.456579][ C1] asm_common_interrupt+0x1e/0x40
[ 97.461691][ C1] acpi_idle_enter+0x25b/0x2e0
[ 97.466456][ C1] cpuidle_enter_state+0x2bd/0x750
[ 97.471564][ C1] cpuidle_enter+0x3c/0x60
[ 97.475968][ C1] do_idle+0x193/0x230
[ 97.480045][ C1] cpu_startup_entry+0x15/0x20
[ 97.484800][ C1] secondary_startup_64_no_verify+0xb0/0xbb
[ 97.490677][ C1]
[ 97.492994][ C1] Reported by Kernel Concurrency Sanitizer on:
[ 97.499142][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.10.0-rc4-syzkaller #0
[ 97.507189][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 97.517229][ C1] ==================================================================
[ 97.525286][ C1] Kernel panic - not syncing: panic_on_warn set ...
[ 97.531869][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.10.0-rc4-syzkaller #0
[ 97.539834][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 97.550071][ C1] Call Trace:
[ 97.553347][ C1]
[ 97.556219][ C1] dump_stack+0x116/0x15d
[ 97.560552][ C1] panic+0x1e7/0x5fa
[ 97.564479][ C1] ? vprintk_emit+0x2f2/0x370
[ 97.569158][ C1] kcsan_report+0x67b/0x680
[ 97.573675][ C1] ? kcsan_setup_watchpoint+0x46a/0x4d0
[ 97.579219][ C1] ? virtqueue_disable_cb+0x66/0x120
[ 97.584710][ C1] ? skb_xmit_done+0xa5/0x110
[ 97.589385][ C1] ? vring_interrupt+0x11e/0x140
[ 97.594326][ C1] ? __handle_irq_event_percpu+0x93/0x450
[ 97.600043][ C1] ? handle_irq_event+0x81/0x120
[ 97.604985][ C1] ? handle_edge_irq+0x16e/0x590
[ 97.609923][ C1] ? asm_call_irq_on_stack+0xf/0x20
[ 97.615123][ C1] ? common_interrupt+0x8e/0x130
[ 97.620062][ C1] ? asm_common_interrupt+0x1e/0x40
[ 97.625266][ C1] ? acpi_idle_enter+0x25b/0x2e0
[ 97.630212][ C1] ? cpuidle_enter_state+0x2bd/0x750
[ 97.635603][ C1] ? cpuidle_enter+0x3c/0x60
[ 97.640187][ C1] ? do_idle+0x193/0x230
[ 97.644444][ C1] ? cpu_startup_entry+0x15/0x20
[ 97.649376][ C1] ? secondary_startup_64_no_verify+0xb0/0xbb
[ 97.655455][ C1] ? tcp_established_options+0x1e4/0x440
[ 97.661438][ C1] kcsan_setup_watchpoint+0x46a/0x4d0
[ 97.666861][ C1] virtqueue_disable_cb+0x66/0x120
[ 97.671998][ C1] skb_xmit_done+0xa5/0x110
[ 97.676621][ C1] ? skb_recv_done+0x90/0x90
[ 97.681221][ C1] vring_interrupt+0x11e/0x140
[ 97.685989][ C1] ? virtqueue_detach_unused_buf+0x1e0/0x1e0
[ 97.692055][ C1] __handle_irq_event_percpu+0x93/0x450
[ 97.697600][ C1] handle_irq_event+0x81/0x120
[ 97.702398][ C1] handle_edge_irq+0x16e/0x590
[ 97.707202][ C1] asm_call_irq_on_stack+0xf/0x20
[ 97.712242][ C1]
[ 97.715187][ C1] common_interrupt+0x8e/0x130
[ 97.719968][ C1] asm_common_interrupt+0x1e/0x40
[ 97.724996][ C1] RIP: 0010:acpi_idle_enter+0x25b/0x2e0
[ 97.730663][ C1] Code: 48 8b 1b 48 89 de 48 83 e6 08 31 ff e8 2e db 8f fe 48 83 e3 08 75 63 e9 0c 00 00 00 e8 6e d6 8f fe 0f 00 2d 31 87 2a 03 fb f4 eb 59 49 8d 7c 24 04 e8 38 00 a0 fe 41 8b 54 24 04 ec 48 c7 c7
[ 97.751125][ C1] RSP: 0018:ffffc90000cd3e10 EFLAGS: 00000246
[ 97.757185][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000008b
[ 97.765144][ C1] RDX: ffff888100c25040 RSI: 0000000000000000 RDI: 0000000000000000
[ 97.773230][ C1] RBP: 0000000000000001 R08: ffffffff82b4b3c2 R09: ffffffff82b4b383
[ 97.781205][ C1] R10: 0000000000000002 R11: ffff888100c25040 R12: ffff88810106b864
[ 97.789357][ C1] R13: 0000000000000001 R14: 0000000000000001 R15: ffff88813bd00000
[ 97.797633][ C1] ? acpi_idle_enter+0x203/0x2e0
[ 97.802582][ C1] ? acpi_idle_enter+0x242/0x2e0
[ 97.807621][ C1] cpuidle_enter_state+0x2bd/0x750
[ 97.812762][ C1] cpuidle_enter+0x3c/0x60
[ 97.817172][ C1] do_idle+0x193/0x230
[ 97.821234][ C1] cpu_startup_entry+0x15/0x20
[ 97.825992][ C1] secondary_startup_64_no_verify+0xb0/0xbb
[ 97.832565][ C1] Kernel Offset: disabled
[ 97.836882][ C1] Rebooting in 86400 seconds..