[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. 2020/05/20 15:29:30 fuzzer started 2020/05/20 15:29:30 dialing manager at 10.128.0.105:44971 2020/05/20 15:29:30 syscalls: 3055 2020/05/20 15:29:30 code coverage: enabled 2020/05/20 15:29:30 comparison tracing: enabled 2020/05/20 15:29:30 extra coverage: enabled 2020/05/20 15:29:30 setuid sandbox: enabled 2020/05/20 15:29:30 namespace sandbox: enabled 2020/05/20 15:29:30 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/20 15:29:30 fault injection: enabled 2020/05/20 15:29:30 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/20 15:29:30 net packet injection: enabled 2020/05/20 15:29:30 net device setup: enabled 2020/05/20 15:29:30 concurrency sanitizer: enabled 2020/05/20 15:29:30 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/20 15:29:30 USB emulation: enabled syzkaller login: [ 53.119845][ T8942] KCSAN: could not find function: '_find_next_bit' 2020/05/20 15:29:33 adding functions to KCSAN blacklist: '__find_get_block' 'add_timer' 'generic_write_end' 'pcpu_alloc' 'ktime_get_real_seconds' 'page_counter_charge' 'tick_sched_do_timer' 'xas_clear_mark' 'find_get_pages_range_tag' 'do_signal_stop' 'n_tty_receive_buf_common' 'blk_mq_sched_dispatch_requests' 'generic_fillattr' 'get_cpu_idle_time_us' '_find_next_bit' 'echo_char' 'shmem_getpage_gfp' 'mod_timer' 'copy_process' 'ext4_free_inodes_count' 'ext4_ext_try_to_merge_right' 'fsnotify' 'ep_poll' 'alloc_pid' '__ext4_new_inode' 'blk_mq_dispatch_rq_list' [ 109.993801][ T8933] ================================================================== [ 110.001941][ T8933] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 110.009917][ T8933] [ 110.012246][ T8933] write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 0: [ 110.020029][ T8933] timekeeping_advance+0x88e/0xd80 [ 110.025116][ T8933] update_wall_time+0x15/0x20 [ 110.029832][ T8933] tick_do_update_jiffies64+0x1e5/0x2a0 [ 110.035358][ T8933] tick_sched_do_timer+0xc7/0xd0 [ 110.040274][ T8933] tick_sched_timer+0x3f/0xd0 [ 110.044928][ T8933] __hrtimer_run_queues+0x271/0x600 [ 110.050103][ T8933] hrtimer_interrupt+0x226/0x490 [ 110.055039][ T8933] smp_apic_timer_interrupt+0xd8/0x270 [ 110.060562][ T8933] apic_timer_interrupt+0xf/0x20 [ 110.065477][ T8933] kcsan_setup_watchpoint+0x25a/0x440 [ 110.070848][ T8933] receive_buf+0xae/0x3420 [ 110.075269][ T8933] virtnet_poll+0x343/0x790 [ 110.079768][ T8933] net_rx_action+0x3ad/0xac0 [ 110.084343][ T8933] __do_softirq+0x118/0x34a [ 110.088828][ T8933] run_ksoftirqd+0x41/0x60 [ 110.093225][ T8933] smpboot_thread_fn+0x374/0x4a0 [ 110.098230][ T8933] kthread+0x203/0x230 [ 110.102298][ T8933] ret_from_fork+0x1f/0x30 [ 110.106682][ T8933] [ 110.108990][ T8933] read to 0xffffffff88ae9140 of 8 bytes by task 8933 on cpu 1: [ 110.116513][ T8933] ktime_get_seconds+0x42/0x60 [ 110.121267][ T8933] tcp_rcv_established+0xe79/0xee0 [ 110.126371][ T8933] tcp_v4_do_rcv+0x396/0x4f0 [ 110.130957][ T8933] __release_sock+0x130/0x1e0 [ 110.135627][ T8933] release_sock+0x5e/0x160 [ 110.140021][ T8933] tcp_recvmsg+0x68e/0x1ba0 [ 110.144508][ T8933] inet_recvmsg+0xc1/0x250 [ 110.148903][ T8933] sock_recvmsg+0x8e/0xb0 [ 110.153209][ T8933] sock_read_iter+0x185/0x230 [ 110.157867][ T8933] new_sync_read+0x416/0x450 [ 110.162449][ T8933] __vfs_read+0x9e/0xb0 [ 110.166596][ T8933] vfs_read+0x13e/0x2b0 [ 110.170812][ T8933] ksys_read+0x16a/0x1a0 [ 110.175030][ T8933] __x64_sys_read+0x49/0x60 [ 110.179514][ T8933] do_syscall_64+0xc7/0x3b0 [ 110.183997][ T8933] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 110.189856][ T8933] [ 110.192171][ T8933] Reported by Kernel Concurrency Sanitizer on: [ 110.198301][ T8933] CPU: 1 PID: 8933 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 110.206511][ T8933] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 110.216553][ T8933] ================================================================== [ 110.224588][ T8933] Kernel panic - not syncing: panic_on_warn set ... [ 110.231156][ T8933] CPU: 1 PID: 8933 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 110.239387][ T8933] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 110.249679][ T8933] Call Trace: [ 110.252968][ T8933] dump_stack+0x11d/0x187 [ 110.257312][ T8933] panic+0x210/0x640 [ 110.261188][ T8933] ? vprintk_func+0x89/0x13a [ 110.265755][ T8933] kcsan_report.cold+0xc/0x1a [ 110.270413][ T8933] kcsan_setup_watchpoint+0x3fb/0x440 [ 110.275765][ T8933] ktime_get_seconds+0x42/0x60 [ 110.280517][ T8933] tcp_rcv_established+0xe79/0xee0 [ 110.285642][ T8933] tcp_v4_do_rcv+0x396/0x4f0 [ 110.290213][ T8933] __release_sock+0x130/0x1e0 [ 110.294874][ T8933] release_sock+0x5e/0x160 [ 110.299288][ T8933] tcp_recvmsg+0x68e/0x1ba0 [ 110.303792][ T8933] inet_recvmsg+0xc1/0x250 [ 110.308187][ T8933] ? apparmor_socket_recvmsg+0x38/0x40 [ 110.313630][ T8933] ? inet_sendpage+0xf0/0xf0 [ 110.318734][ T8933] sock_recvmsg+0x8e/0xb0 [ 110.323046][ T8933] sock_read_iter+0x185/0x230 [ 110.327724][ T8933] new_sync_read+0x416/0x450 [ 110.332317][ T8933] __vfs_read+0x9e/0xb0 [ 110.336470][ T8933] vfs_read+0x13e/0x2b0 [ 110.340617][ T8933] ksys_read+0x16a/0x1a0 [ 110.344839][ T8933] __x64_sys_read+0x49/0x60 [ 110.349325][ T8933] do_syscall_64+0xc7/0x3b0 [ 110.353825][ T8933] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 110.359702][ T8933] RIP: 0033:0x47c530 [ 110.363598][ T8933] 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 [ 110.383686][ T8933] RSP: 002b:000000c420365850 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 110.392091][ T8933] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 110.400047][ T8933] RDX: 0000000000001000 RSI: 000000c420318000 RDI: 0000000000000003 [ 110.408129][ T8933] RBP: 000000c4203658a8 R08: 0000000000000000 R09: 0000000000000000 [ 110.416112][ T8933] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000008 [ 110.424063][ T8933] R13: ffffffffffffffff R14: 0000000000000008 R15: ffffffffffffffff [ 110.433408][ T8933] Kernel Offset: disabled [ 110.437729][ T8933] Rebooting in 86400 seconds..