[ 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 '10.128.0.123' (ECDSA) to the list of known hosts. 2020/06/06 16:51:31 fuzzer started 2020/06/06 16:51:31 dialing manager at 10.128.0.105:33593 2020/06/06 16:51:31 syscalls: 3055 2020/06/06 16:51:31 code coverage: enabled 2020/06/06 16:51:31 comparison tracing: enabled 2020/06/06 16:51:31 extra coverage: enabled 2020/06/06 16:51:31 setuid sandbox: enabled 2020/06/06 16:51:31 namespace sandbox: enabled 2020/06/06 16:51:31 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/06 16:51:31 fault injection: enabled 2020/06/06 16:51:31 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/06 16:51:31 net packet injection: enabled 2020/06/06 16:51:31 net device setup: enabled 2020/06/06 16:51:31 concurrency sanitizer: enabled 2020/06/06 16:51:31 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/06 16:51:31 USB emulation: enabled syzkaller login: [ 52.019558][ T8906] KCSAN: could not find function: '_find_next_bit' 2020/06/06 16:51:36 adding functions to KCSAN blacklist: 'generic_write_end' 'commit_echoes' 'add_timer' 'ext4_mark_iloc_dirty' '__ext4_new_inode' 'find_get_pages_range_tag' 'alloc_pid' 'page_counter_charge' 'ext4_free_inodes_count' '__snd_rawmidi_transmit_ack' '__mark_inode_dirty' '__perf_event_overflow' 'echo_char' 'copy_process' 'tick_sched_do_timer' 'do_syslog' 'run_timer_softirq' 'blk_mq_sched_dispatch_requests' '__send_signal' 'xas_clear_mark' 'shmem_file_read_iter' 'do_nanosleep' '_find_next_bit' 'blk_mq_get_request' 'dd_has_work' 'wbt_done' 'pcpu_alloc' 'futex_wait_queue_me' 'af_alg_sendpage' 'generic_fillattr' 'ep_poll' 'blk_mq_dispatch_rq_list' 'tick_nohz_idle_stop_tick' 'mod_timer' '__delete_from_page_cache' [ 111.995893][ T8892] ================================================================== [ 112.004999][ T8892] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 112.013778][ T8892] [ 112.016611][ T8892] write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 0: [ 112.024602][ T8892] timekeeping_advance+0x88e/0xd80 [ 112.029810][ T8892] update_wall_time+0x15/0x20 [ 112.034484][ T8892] tick_do_update_jiffies64+0x1e5/0x2a0 [ 112.040181][ T8892] tick_sched_do_timer+0xc7/0xd0 [ 112.045094][ T8892] tick_sched_timer+0x3f/0xd0 [ 112.049846][ T8892] __hrtimer_run_queues+0x271/0x600 [ 112.055020][ T8892] hrtimer_interrupt+0x226/0x490 [ 112.059960][ T8892] smp_apic_timer_interrupt+0xd8/0x270 [ 112.065429][ T8892] apic_timer_interrupt+0xf/0x20 [ 112.070354][ T8892] kcsan_setup_watchpoint+0x25a/0x440 [ 112.075708][ T8892] tcp_v4_fill_cb+0x9a/0x1c0 [ 112.080286][ T8892] tcp_v4_rcv+0x1a3d/0x1e10 [ 112.084768][ T8892] ip_protocol_deliver_rcu+0x4b/0x410 [ 112.090223][ T8892] ip_local_deliver_finish+0xf3/0x120 [ 112.095675][ T8892] ip_local_deliver+0x135/0x220 [ 112.101027][ T8892] ip_sublist_rcv_finish+0xf0/0x140 [ 112.106204][ T8892] ip_sublist_rcv+0x3f8/0x530 [ 112.110883][ T8892] ip_list_rcv+0x2f3/0x321 [ 112.115280][ T8892] __netif_receive_skb_list_core+0x368/0x5c0 [ 112.121256][ T8892] netif_receive_skb_list_internal+0x5c7/0x810 [ 112.127821][ T8892] gro_normal_list.part.0+0x37/0xa0 [ 112.133021][ T8892] gro_normal_one+0x14c/0x160 [ 112.137689][ T8892] napi_gro_receive+0x27d/0x2f0 [ 112.142550][ T8892] receive_buf+0x24c/0x3420 [ 112.147167][ T8892] virtnet_poll+0x343/0x790 [ 112.151679][ T8892] net_rx_action+0x3ad/0xac0 [ 112.156340][ T8892] __do_softirq+0x118/0x34a [ 112.160847][ T8892] run_ksoftirqd+0x41/0x60 [ 112.165442][ T8892] smpboot_thread_fn+0x374/0x4a0 [ 112.170543][ T8892] kthread+0x203/0x230 [ 112.174677][ T8892] ret_from_fork+0x1f/0x30 [ 112.179285][ T8892] [ 112.181601][ T8892] read to 0xffffffff88ae9140 of 8 bytes by task 8892 on cpu 1: [ 112.189221][ T8892] ktime_get_seconds+0x42/0x60 [ 112.193981][ T8892] tcp_rcv_established+0xe79/0xee0 [ 112.199366][ T8892] tcp_v4_do_rcv+0x396/0x4f0 [ 112.204443][ T8892] __release_sock+0x130/0x1e0 [ 112.209741][ T8892] release_sock+0x5e/0x160 [ 112.214561][ T8892] tcp_recvmsg+0x68e/0x1ba0 [ 112.219249][ T8892] inet_recvmsg+0xc1/0x250 [ 112.223663][ T8892] sock_recvmsg+0x8e/0xb0 [ 112.227975][ T8892] sock_read_iter+0x185/0x230 [ 112.233950][ T8892] new_sync_read+0x416/0x450 [ 112.238924][ T8892] __vfs_read+0x9e/0xb0 [ 112.243082][ T8892] vfs_read+0x13e/0x2b0 [ 112.247213][ T8892] ksys_read+0x16a/0x1a0 [ 112.251462][ T8892] __x64_sys_read+0x49/0x60 [ 112.256319][ T8892] do_syscall_64+0xc7/0x3b0 [ 112.260808][ T8892] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 112.266695][ T8892] [ 112.269680][ T8892] Reported by Kernel Concurrency Sanitizer on: [ 112.276888][ T8892] CPU: 1 PID: 8892 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 112.288200][ T8892] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 112.298782][ T8892] ================================================================== [ 112.306959][ T8892] Kernel panic - not syncing: panic_on_warn set ... [ 112.313634][ T8892] CPU: 1 PID: 8892 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 112.321980][ T8892] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 112.332573][ T8892] Call Trace: [ 112.335877][ T8892] dump_stack+0x11d/0x187 [ 112.340581][ T8892] panic+0x210/0x640 [ 112.344674][ T8892] ? vprintk_func+0x89/0x13a [ 112.349535][ T8892] kcsan_report.cold+0xc/0x1a [ 112.354200][ T8892] kcsan_setup_watchpoint+0x3fb/0x440 [ 112.359556][ T8892] ktime_get_seconds+0x42/0x60 [ 112.364319][ T8892] tcp_rcv_established+0xe79/0xee0 [ 112.369770][ T8892] tcp_v4_do_rcv+0x396/0x4f0 [ 112.374525][ T8892] __release_sock+0x130/0x1e0 [ 112.379218][ T8892] release_sock+0x5e/0x160 [ 112.383616][ T8892] tcp_recvmsg+0x68e/0x1ba0 [ 112.388118][ T8892] inet_recvmsg+0xc1/0x250 [ 112.392540][ T8892] ? apparmor_socket_recvmsg+0x38/0x40 [ 112.397984][ T8892] ? inet_sendpage+0xf0/0xf0 [ 112.402561][ T8892] sock_recvmsg+0x8e/0xb0 [ 112.406886][ T8892] sock_read_iter+0x185/0x230 [ 112.411546][ T8892] new_sync_read+0x416/0x450 [ 112.416129][ T8892] __vfs_read+0x9e/0xb0 [ 112.421479][ T8892] vfs_read+0x13e/0x2b0 [ 112.425627][ T8892] ksys_read+0x16a/0x1a0 [ 112.429853][ T8892] __x64_sys_read+0x49/0x60 [ 112.434443][ T8892] do_syscall_64+0xc7/0x3b0 [ 112.438930][ T8892] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 112.444988][ T8892] RIP: 0033:0x4b3cdb [ 112.448866][ T8892] 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 [ 112.469429][ T8892] RSP: 002b:000000c000163890 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 112.477818][ T8892] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 112.485812][ T8892] RDX: 0000000000001000 RSI: 000000c000360000 RDI: 0000000000000006 [ 112.493885][ T8892] RBP: 000000c0001638e0 R08: 0000000000000001 R09: 0000000000000002 [ 112.501939][ T8892] R10: 0000000000004e49 R11: 0000000000000206 R12: 0000000000005c35 [ 112.509890][ T8892] R13: 0000000000000400 R14: 0000000000000020 R15: 0000000000000004 [ 112.519452][ T8892] Kernel Offset: disabled [ 112.523776][ T8892] Rebooting in 86400 seconds..