[ 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. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.113' (ECDSA) to the list of known hosts. 2020/06/15 16:15:39 fuzzer started 2020/06/15 16:15:39 dialing manager at 10.128.0.105:32959 2020/06/15 16:15:39 syscalls: 3085 2020/06/15 16:15:39 code coverage: enabled 2020/06/15 16:15:39 comparison tracing: enabled 2020/06/15 16:15:39 extra coverage: enabled 2020/06/15 16:15:39 setuid sandbox: enabled 2020/06/15 16:15:39 namespace sandbox: enabled 2020/06/15 16:15:39 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/15 16:15:39 fault injection: enabled 2020/06/15 16:15:39 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/15 16:15:39 net packet injection: enabled 2020/06/15 16:15:39 net device setup: enabled 2020/06/15 16:15:39 concurrency sanitizer: enabled 2020/06/15 16:15:39 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/15 16:15:39 USB emulation: enabled syzkaller login: [ 53.001996][ T8905] KCSAN: could not find function: '_find_next_bit' 2020/06/15 16:15:44 suppressing KCSAN reports in functions: 'wbt_done' '__ext4_new_inode' 'generic_file_read_iter' 'complete_signal' 'copy_process' 'generic_write_end' 'tick_sched_do_timer' 'dd_has_work' '_find_next_bit' 'find_get_pages_range_tag' 'pcpu_alloc' 'kauditd_thread' 'blk_mq_get_request' 'shmem_getpage_gfp' 'shmem_file_read_iter' 'file_update_time' 'ktime_get_real_seconds' 'echo_char' 'do_signal_stop' 'xas_find_marked' 'do_syslog' 'get_cpu_idle_time_us' 'mnt_clone_write' 'generic_fillattr' 'ext4_free_inodes_count' 'add_timer' 'audit_log_start' 'io_sq_thread' 'ext4_mark_iloc_dirty' 'xas_clear_mark' 'decrypt_packet' '__add_to_page_cache_locked' '__mark_inode_dirty' 'fsnotify' 'ep_poll' 'run_timer_softirq' 'blk_mq_dispatch_rq_list' 'futex_wait_queue_me' 'mod_timer' '__mpage_writepage' 'blk_mq_sched_dispatch_requests' 'ondemand_readahead' 'tick_nohz_idle_stop_tick' 'alloc_pid' 'page_counter_charge' 'tick_nohz_next_event' 'do_nanosleep' [ 217.009744][ T8893] ================================================================== [ 217.018022][ T8893] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 217.025898][ T8893] [ 217.028225][ T8893] write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 0: [ 217.036027][ T8893] timekeeping_advance+0x88e/0xd80 [ 217.041130][ T8893] update_wall_time+0x15/0x20 [ 217.045809][ T8893] tick_do_update_jiffies64+0x1e5/0x2a0 [ 217.051355][ T8893] tick_sched_do_timer+0xc7/0xd0 [ 217.056290][ T8893] tick_sched_timer+0x3f/0xd0 [ 217.060960][ T8893] __hrtimer_run_queues+0x271/0x600 [ 217.066154][ T8893] hrtimer_interrupt+0x226/0x490 [ 217.071087][ T8893] smp_apic_timer_interrupt+0xd8/0x270 [ 217.076540][ T8893] apic_timer_interrupt+0xf/0x20 [ 217.081510][ T8893] __sanitizer_cov_trace_switch+0xe/0x70 [ 217.087139][ T8893] __read_once_size+0x20/0x100 [ 217.091900][ T8893] packet_rcv+0x205/0xa60 [ 217.096215][ T8893] __netif_receive_skb_core+0x108b/0x2120 [ 217.101910][ T8893] __netif_receive_skb_list_core+0x2b1/0x5c0 [ 217.107887][ T8893] netif_receive_skb_list_internal+0x5c7/0x810 [ 217.114033][ T8893] gro_normal_list.part.0+0x37/0xa0 [ 217.119205][ T8893] gro_normal_one+0x14c/0x160 [ 217.123859][ T8893] napi_gro_receive+0x27d/0x2f0 [ 217.128685][ T8893] receive_buf+0x24c/0x3420 [ 217.133163][ T8893] virtnet_poll+0x343/0x790 [ 217.137640][ T8893] net_rx_action+0x3ad/0xac0 [ 217.142222][ T8893] __do_softirq+0x118/0x34a [ 217.146699][ T8893] run_ksoftirqd+0x41/0x60 [ 217.151087][ T8893] smpboot_thread_fn+0x374/0x4a0 [ 217.156006][ T8893] kthread+0x203/0x230 [ 217.160062][ T8893] ret_from_fork+0x1f/0x30 [ 217.164443][ T8893] [ 217.166748][ T8893] read to 0xffffffff88ae9140 of 8 bytes by task 8893 on cpu 1: [ 217.174263][ T8893] ktime_get_seconds+0x42/0x60 [ 217.179013][ T8893] tcp_rcv_established+0xe79/0xee0 [ 217.184117][ T8893] tcp_v4_do_rcv+0x396/0x4f0 [ 217.188699][ T8893] __release_sock+0x130/0x1e0 [ 217.193358][ T8893] release_sock+0x5e/0x160 [ 217.197751][ T8893] tcp_recvmsg+0x68e/0x1ba0 [ 217.202243][ T8893] inet_recvmsg+0xc1/0x250 [ 217.206643][ T8893] sock_recvmsg+0x8e/0xb0 [ 217.210951][ T8893] sock_read_iter+0x185/0x230 [ 217.215617][ T8893] new_sync_read+0x416/0x450 [ 217.220184][ T8893] __vfs_read+0x9e/0xb0 [ 217.224327][ T8893] vfs_read+0x13e/0x2b0 [ 217.228459][ T8893] ksys_read+0x16a/0x1a0 [ 217.232686][ T8893] __x64_sys_read+0x49/0x60 [ 217.237175][ T8893] do_syscall_64+0xc7/0x3b0 [ 217.241658][ T8893] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 217.247521][ T8893] [ 217.249822][ T8893] Reported by Kernel Concurrency Sanitizer on: [ 217.255962][ T8893] CPU: 1 PID: 8893 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 217.264177][ T8893] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 217.274207][ T8893] ================================================================== [ 217.282243][ T8893] Kernel panic - not syncing: panic_on_warn set ... [ 217.288818][ T8893] CPU: 1 PID: 8893 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 217.297115][ T8893] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 217.307154][ T8893] Call Trace: [ 217.310483][ T8893] dump_stack+0x11d/0x187 [ 217.314846][ T8893] panic+0x210/0x640 [ 217.318759][ T8893] ? vprintk_func+0x89/0x13a [ 217.323333][ T8893] kcsan_report.cold+0xc/0x1a [ 217.327989][ T8893] kcsan_setup_watchpoint+0x3fb/0x440 [ 217.333378][ T8893] ktime_get_seconds+0x42/0x60 [ 217.338218][ T8893] tcp_rcv_established+0xe79/0xee0 [ 217.343326][ T8893] tcp_v4_do_rcv+0x396/0x4f0 [ 217.347899][ T8893] __release_sock+0x130/0x1e0 [ 217.352594][ T8893] release_sock+0x5e/0x160 [ 217.357015][ T8893] tcp_recvmsg+0x68e/0x1ba0 [ 217.361511][ T8893] inet_recvmsg+0xc1/0x250 [ 217.365909][ T8893] ? apparmor_socket_recvmsg+0x38/0x40 [ 217.371348][ T8893] ? inet_sendpage+0xf0/0xf0 [ 217.375914][ T8893] sock_recvmsg+0x8e/0xb0 [ 217.380222][ T8893] sock_read_iter+0x185/0x230 [ 217.384891][ T8893] new_sync_read+0x416/0x450 [ 217.389463][ T8893] __vfs_read+0x9e/0xb0 [ 217.393607][ T8893] vfs_read+0x13e/0x2b0 [ 217.397746][ T8893] ksys_read+0x16a/0x1a0 [ 217.401979][ T8893] __x64_sys_read+0x49/0x60 [ 217.406479][ T8893] do_syscall_64+0xc7/0x3b0 [ 217.410962][ T8893] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 217.416842][ T8893] RIP: 0033:0x4b3cdb [ 217.421336][ T8893] Code: ff e9 69 ff ff ff cc cc cc cc cc cc cc cc cc e8 bb a1 f8 ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 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 [ 217.440914][ T8893] RSP: 002b:000000c0001e18b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 217.449300][ T8893] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb [ 217.457245][ T8893] RDX: 0000000000001000 RSI: 000000c000462000 RDI: 0000000000000006 [ 217.465194][ T8893] RBP: 000000c0001e1908 R08: 0000000000000001 R09: 0000000000000002 [ 217.473140][ T8893] R10: 00000000000034ca R11: 0000000000000212 R12: 0000000000003547 [ 217.481100][ T8893] R13: 0000000000000020 R14: 0000000000000020 R15: 0000000000000004 [ 217.489717][ T8893] Kernel Offset: disabled [ 217.494031][ T8893] Rebooting in 86400 seconds..