[ 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 '10.128.0.208' (ECDSA) to the list of known hosts. 2020/06/16 12:49:41 fuzzer started 2020/06/16 12:49:41 dialing manager at 10.128.0.105:37643 2020/06/16 12:49:50 syscalls: 3085 2020/06/16 12:49:50 code coverage: enabled 2020/06/16 12:49:50 comparison tracing: enabled 2020/06/16 12:49:50 extra coverage: enabled 2020/06/16 12:49:50 setuid sandbox: enabled 2020/06/16 12:49:50 namespace sandbox: enabled 2020/06/16 12:49:50 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/16 12:49:50 fault injection: enabled 2020/06/16 12:49:50 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/16 12:49:50 net packet injection: enabled 2020/06/16 12:49:50 net device setup: enabled 2020/06/16 12:49:50 concurrency sanitizer: enabled 2020/06/16 12:49:50 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/16 12:49:50 USB emulation: enabled syzkaller login: [ 62.763494][ T8921] KCSAN: could not find function: '_find_next_bit' [ 63.790090][ T8921] KCSAN: could not find function: 'poll_schedule_timeout' 2020/06/16 12:49:54 suppressing KCSAN reports in functions: 'generic_fillattr' '__ext4_new_inode' 'blk_mq_sched_dispatch_requests' 'do_nanosleep' 'find_get_pages_range_tag' 'decrypt_packet' 'run_timer_softirq' 'fasync_remove_entry' 'io_sq_thread' 'file_update_time' 'kauditd_thread' 'blk_mq_get_request' 'mod_timer' 'generic_file_read_iter' '_find_next_bit' 'page_counter_charge' 'tick_sched_do_timer' 'copy_process' 'blk_mq_dispatch_rq_list' 'ext4_free_inodes_count' 'do_syslog' 'poll_schedule_timeout' 'ep_poll' 'complete_signal' 'generic_write_end' 'futex_wait_queue_me' 'pcpu_alloc' 'xas_clear_mark' 'alloc_pid' '__send_signal' 'atime_needs_update' 'commit_echoes' [ 113.986013][ T8908] ================================================================== [ 113.994148][ T8908] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 114.002022][ T8908] [ 114.004348][ T8908] write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 1: [ 114.012681][ T8908] timekeeping_advance+0x88e/0xd80 [ 114.017816][ T8908] update_wall_time+0x15/0x20 [ 114.022581][ T8908] tick_do_update_jiffies64+0x1e5/0x2a0 [ 114.028213][ T8908] tick_sched_do_timer+0xc7/0xd0 [ 114.033152][ T8908] tick_sched_timer+0x3f/0xd0 [ 114.037999][ T8908] __hrtimer_run_queues+0x271/0x600 [ 114.043201][ T8908] hrtimer_interrupt+0x226/0x490 [ 114.048130][ T8908] smp_apic_timer_interrupt+0xd8/0x270 [ 114.053580][ T8908] apic_timer_interrupt+0xf/0x20 [ 114.058512][ T8908] __tsan_read1+0x2c/0x110 [ 114.062903][ T8908] tcp_v4_fill_cb+0x9a/0x1c0 [ 114.067474][ T8908] tcp_v4_rcv+0x1a3d/0x1e10 [ 114.072136][ T8908] ip_protocol_deliver_rcu+0x4b/0x410 [ 114.077595][ T8908] ip_local_deliver_finish+0xf3/0x120 [ 114.082957][ T8908] ip_local_deliver+0x135/0x220 [ 114.087924][ T8908] ip_sublist_rcv_finish+0xf0/0x140 [ 114.093433][ T8908] ip_sublist_rcv+0x3f8/0x530 [ 114.098440][ T8908] ip_list_rcv+0x2f3/0x321 [ 114.102837][ T8908] __netif_receive_skb_list_core+0x368/0x5c0 [ 114.108795][ T8908] netif_receive_skb_list_internal+0x5c7/0x810 [ 114.114962][ T8908] gro_normal_list.part.0+0x37/0xa0 [ 114.122233][ T8908] gro_normal_one+0x14c/0x160 [ 114.126885][ T8908] napi_gro_receive+0x27d/0x2f0 [ 114.131709][ T8908] receive_buf+0x24c/0x3420 [ 114.136289][ T8908] virtnet_poll+0x343/0x790 [ 114.140781][ T8908] net_rx_action+0x3ad/0xac0 [ 114.145359][ T8908] __do_softirq+0x118/0x34a [ 114.149846][ T8908] run_ksoftirqd+0x41/0x60 [ 114.154237][ T8908] smpboot_thread_fn+0x374/0x4a0 [ 114.159155][ T8908] kthread+0x203/0x230 [ 114.163197][ T8908] ret_from_fork+0x1f/0x30 [ 114.167589][ T8908] [ 114.169913][ T8908] read to 0xffffffff88ae9140 of 8 bytes by task 8908 on cpu 0: [ 114.177557][ T8908] ktime_get_seconds+0x42/0x60 [ 114.182302][ T8908] tcp_rcv_established+0xe79/0xee0 [ 114.187391][ T8908] tcp_v4_do_rcv+0x396/0x4f0 [ 114.191960][ T8908] __release_sock+0x130/0x1e0 [ 114.196612][ T8908] release_sock+0x5e/0x160 [ 114.201024][ T8908] tcp_recvmsg+0x68e/0x1ba0 [ 114.205502][ T8908] inet_recvmsg+0xc1/0x250 [ 114.209980][ T8908] sock_recvmsg+0x8e/0xb0 [ 114.214297][ T8908] sock_read_iter+0x185/0x230 [ 114.218951][ T8908] new_sync_read+0x416/0x450 [ 114.223519][ T8908] __vfs_read+0x9e/0xb0 [ 114.227656][ T8908] vfs_read+0x13e/0x2b0 [ 114.231793][ T8908] ksys_read+0x16a/0x1a0 [ 114.236012][ T8908] __x64_sys_read+0x49/0x60 [ 114.240656][ T8908] do_syscall_64+0xc7/0x3b0 [ 114.245155][ T8908] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 114.251421][ T8908] [ 114.253852][ T8908] Reported by Kernel Concurrency Sanitizer on: [ 114.260012][ T8908] CPU: 0 PID: 8908 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 114.268238][ T8908] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 114.278372][ T8908] ================================================================== [ 114.286467][ T8908] Kernel panic - not syncing: panic_on_warn set ... [ 114.293393][ T8908] CPU: 0 PID: 8908 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 114.302057][ T8908] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 114.312102][ T8908] Call Trace: [ 114.316344][ T8908] dump_stack+0x11d/0x187 [ 114.320671][ T8908] panic+0x210/0x640 [ 114.324556][ T8908] ? vprintk_func+0x89/0x13a [ 114.329123][ T8908] kcsan_report.cold+0xc/0x1a [ 114.334249][ T8908] kcsan_setup_watchpoint+0x3fb/0x440 [ 114.339598][ T8908] ktime_get_seconds+0x42/0x60 [ 114.344368][ T8908] tcp_rcv_established+0xe79/0xee0 [ 114.349480][ T8908] tcp_v4_do_rcv+0x396/0x4f0 [ 114.354070][ T8908] __release_sock+0x130/0x1e0 [ 114.358728][ T8908] release_sock+0x5e/0x160 [ 114.363124][ T8908] tcp_recvmsg+0x68e/0x1ba0 [ 114.367628][ T8908] inet_recvmsg+0xc1/0x250 [ 114.372024][ T8908] ? apparmor_socket_recvmsg+0x38/0x40 [ 114.377461][ T8908] ? inet_sendpage+0xf0/0xf0 [ 114.382030][ T8908] sock_recvmsg+0x8e/0xb0 [ 114.386337][ T8908] sock_read_iter+0x185/0x230 [ 114.391957][ T8908] new_sync_read+0x416/0x450 [ 114.396542][ T8908] __vfs_read+0x9e/0xb0 [ 114.400683][ T8908] vfs_read+0x13e/0x2b0 [ 114.404829][ T8908] ksys_read+0x16a/0x1a0 [ 114.409232][ T8908] __x64_sys_read+0x49/0x60 [ 114.413733][ T8908] do_syscall_64+0xc7/0x3b0 [ 114.418229][ T8908] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 114.424096][ T8908] RIP: 0033:0x4b3cdb [ 114.427972][ T8908] 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 [ 114.447565][ T8908] RSP: 002b:000000c00036b890 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 114.455968][ T8908] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 114.463981][ T8908] RDX: 0000000000001000 RSI: 000000c0001fe000 RDI: 0000000000000006 [ 114.471965][ T8908] RBP: 000000c00036b8e0 R08: 0000000000000001 R09: 0000000000000002 [ 114.480093][ T8908] R10: 0000000000002490 R11: 0000000000000206 R12: 0000000000006deb [ 114.488045][ T8908] R13: 0000000000002000 R14: 0000000000000002 R15: 0000000000000002 [ 114.497492][ T8908] Kernel Offset: disabled [ 114.501829][ T8908] Rebooting in 86400 seconds..