[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.46' (ECDSA) to the list of known hosts. 2020/05/03 07:22:20 fuzzer started 2020/05/03 07:22:20 dialing manager at 10.128.0.105:41005 2020/05/03 07:22:20 syscalls: 2964 2020/05/03 07:22:20 code coverage: enabled 2020/05/03 07:22:20 comparison tracing: enabled 2020/05/03 07:22:20 extra coverage: enabled 2020/05/03 07:22:20 setuid sandbox: enabled 2020/05/03 07:22:20 namespace sandbox: enabled 2020/05/03 07:22:20 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/03 07:22:20 fault injection: enabled 2020/05/03 07:22:20 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/03 07:22:20 net packet injection: enabled 2020/05/03 07:22:20 net device setup: enabled 2020/05/03 07:22:20 concurrency sanitizer: enabled 2020/05/03 07:22:20 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/03 07:22:20 USB emulation: /dev/raw-gadget does not exist syzkaller login: [ 45.653522][ T6741] KCSAN: could not find function: '_find_next_bit' [ 46.827374][ T6741] KCSAN: could not find function: 'poll_schedule_timeout' 2020/05/03 07:22:25 adding functions to KCSAN blacklist: 'ext4_mb_good_group' 'vm_area_dup' 'find_get_pages_range_tag' 'ep_poll' 'generic_fillattr' 'do_syslog' 'blk_mq_dispatch_rq_list' '__bpf_lru_node_move_in' 'do_signal_stop' 'page_counter_charge' 'ext4_free_inodes_count' 'shmem_add_to_page_cache' '__delete_from_page_cache' 'fsnotify' 'tick_sched_do_timer' 'alloc_pid' 'mod_timer' '_find_next_bit' '__snd_rawmidi_transmit_ack' 'generic_write_end' 'xas_clear_mark' 'wbt_done' 'poll_schedule_timeout' 'ext4_sync_file' 'iput' '__x64_sys_ptrace' 'ktime_get_real_seconds' 'add_timer' '__ext4_new_inode' 'blk_mq_get_request' '__dentry_kill' 'do_nanosleep' 'tick_nohz_idle_stop_tick' 'wbt_wait' 'blk_mq_sched_dispatch_requests' '__writeback_single_inode' 'get_signal' 'kauditd_thread' 'timer_clear_idle' 'run_timer_softirq' 'dd_has_work' 'echo_char' 'file_remove_privs' 'find_alive_thread' 'ext4_mark_iloc_dirty' 'xas_find_marked' 'copy_process' [ 143.008708][ T6727] ================================================================== [ 143.016866][ T6727] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 143.024757][ T6727] [ 143.027084][ T6727] write to 0xffffffff86fce8c8 of 280 bytes by interrupt on cpu 1: [ 143.034903][ T6727] timekeeping_advance+0x88e/0xd80 [ 143.040011][ T6727] update_wall_time+0x15/0x20 [ 143.044682][ T6727] tick_do_update_jiffies64+0x1e5/0x2a0 [ 143.050221][ T6727] tick_sched_do_timer+0xc7/0xd0 [ 143.055153][ T6727] tick_sched_timer+0x3f/0xd0 [ 143.059827][ T6727] __hrtimer_run_queues+0x271/0x600 [ 143.065020][ T6727] hrtimer_interrupt+0x226/0x490 [ 143.069953][ T6727] smp_apic_timer_interrupt+0xd8/0x270 [ 143.075475][ T6727] apic_timer_interrupt+0xf/0x20 [ 143.080401][ T6727] __tsan_unaligned_write4+0x33/0x110 [ 143.085799][ T6727] inet_gro_receive+0x6a8/0x770 [ 143.090634][ T6727] dev_gro_receive+0x9d9/0x10f0 [ 143.095466][ T6727] napi_gro_receive+0x76/0x2f0 [ 143.100207][ T6727] receive_buf+0x252/0x2ed0 [ 143.104708][ T6727] virtnet_poll+0x343/0x790 [ 143.109187][ T6727] net_rx_action+0x3ad/0xac0 [ 143.113755][ T6727] __do_softirq+0x118/0x34a [ 143.118409][ T6727] run_ksoftirqd+0x41/0x60 [ 143.122823][ T6727] smpboot_thread_fn+0x374/0x4a0 [ 143.127743][ T6727] kthread+0x203/0x230 [ 143.131793][ T6727] ret_from_fork+0x1f/0x30 [ 143.136191][ T6727] [ 143.138552][ T6727] read to 0xffffffff86fce940 of 8 bytes by task 6727 on cpu 0: [ 143.146105][ T6727] ktime_get_seconds+0x42/0x60 [ 143.150862][ T6727] tcp_rcv_established+0xe79/0xee0 [ 143.155946][ T6727] tcp_v4_do_rcv+0x396/0x4f0 [ 143.160510][ T6727] __release_sock+0x130/0x1e0 [ 143.165170][ T6727] release_sock+0x5e/0x160 [ 143.169560][ T6727] tcp_recvmsg+0x68e/0x1ba0 [ 143.174039][ T6727] inet_recvmsg+0xc1/0x250 [ 143.178440][ T6727] sock_recvmsg+0x8e/0xb0 [ 143.182743][ T6727] sock_read_iter+0x185/0x230 [ 143.187392][ T6727] new_sync_read+0x416/0x450 [ 143.191955][ T6727] __vfs_read+0x9e/0xb0 [ 143.196082][ T6727] vfs_read+0x13e/0x2b0 [ 143.200210][ T6727] ksys_read+0x16a/0x1a0 [ 143.204426][ T6727] __x64_sys_read+0x49/0x60 [ 143.208915][ T6727] do_syscall_64+0xc7/0x3b0 [ 143.213406][ T6727] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 143.219277][ T6727] [ 143.221577][ T6727] Reported by Kernel Concurrency Sanitizer on: [ 143.227714][ T6727] CPU: 0 PID: 6727 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 143.235930][ T6727] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 143.245955][ T6727] ================================================================== [ 143.253991][ T6727] Kernel panic - not syncing: panic_on_warn set ... [ 143.260567][ T6727] CPU: 0 PID: 6727 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 143.268772][ T6727] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 143.278814][ T6727] Call Trace: [ 143.282084][ T6727] dump_stack+0x11d/0x187 [ 143.286390][ T6727] panic+0x210/0x640 [ 143.290268][ T6727] ? vprintk_func+0x89/0x13a [ 143.295032][ T6727] kcsan_report.cold+0xc/0x1a [ 143.299689][ T6727] kcsan_setup_watchpoint+0x3fb/0x440 [ 143.305039][ T6727] ktime_get_seconds+0x42/0x60 [ 143.309852][ T6727] tcp_rcv_established+0xe79/0xee0 [ 143.314965][ T6727] tcp_v4_do_rcv+0x396/0x4f0 [ 143.319539][ T6727] __release_sock+0x130/0x1e0 [ 143.324198][ T6727] release_sock+0x5e/0x160 [ 143.328594][ T6727] tcp_recvmsg+0x68e/0x1ba0 [ 143.333092][ T6727] ? sock_poll+0xfc/0x240 [ 143.337411][ T6727] inet_recvmsg+0xc1/0x250 [ 143.341821][ T6727] ? apparmor_socket_recvmsg+0x38/0x40 [ 143.347276][ T6727] ? inet_sendpage+0xf0/0xf0 [ 143.351860][ T6727] sock_recvmsg+0x8e/0xb0 [ 143.356173][ T6727] sock_read_iter+0x185/0x230 [ 143.360833][ T6727] new_sync_read+0x416/0x450 [ 143.365402][ T6727] __vfs_read+0x9e/0xb0 [ 143.369532][ T6727] vfs_read+0x13e/0x2b0 [ 143.373664][ T6727] ksys_read+0x16a/0x1a0 [ 143.377885][ T6727] __x64_sys_read+0x49/0x60 [ 143.382385][ T6727] do_syscall_64+0xc7/0x3b0 [ 143.386872][ T6727] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 143.392740][ T6727] RIP: 0033:0x47c530 [ 143.396750][ T6727] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 143.416400][ T6727] RSP: 002b:000000c420375810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 143.424788][ T6727] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 143.432738][ T6727] RDX: 0000000000001000 RSI: 000000c420344000 RDI: 0000000000000003 [ 143.440683][ T6727] RBP: 000000c420375868 R08: 0000000000000000 R09: 0000000000000000 [ 143.448629][ T6727] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000010 [ 143.456586][ T6727] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 143.465980][ T6727] Kernel Offset: disabled [ 143.470326][ T6727] Rebooting in 86400 seconds..