[ 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 '10.128.0.127' (ECDSA) to the list of known hosts. 2020/06/09 09:00:41 fuzzer started 2020/06/09 09:00:41 dialing manager at 10.128.0.105:32965 2020/06/09 09:00:41 syscalls: 3055 2020/06/09 09:00:41 code coverage: enabled 2020/06/09 09:00:41 comparison tracing: enabled 2020/06/09 09:00:41 extra coverage: enabled 2020/06/09 09:00:41 setuid sandbox: enabled 2020/06/09 09:00:41 namespace sandbox: enabled 2020/06/09 09:00:41 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/09 09:00:41 fault injection: enabled 2020/06/09 09:00:41 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/09 09:00:41 net packet injection: enabled 2020/06/09 09:00:41 net device setup: enabled 2020/06/09 09:00:41 concurrency sanitizer: enabled 2020/06/09 09:00:41 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/09 09:00:41 USB emulation: enabled syzkaller login: [ 49.736577][ T8935] KCSAN: could not find function: '_find_next_bit' [ 50.510433][ T8935] KCSAN: could not find function: 'poll_schedule_timeout' 2020/06/09 09:00:47 adding functions to KCSAN blacklist: 'copy_process' 'blk_mq_sched_dispatch_requests' 'dd_has_work' 'do_exit' 'wbt_done' 'inotify_handle_event' 'run_timer_softirq' 'xas_find_marked' 'tick_nohz_idle_stop_tick' 'alloc_pid' 'ext4_mark_iloc_dirty' 'tick_nohz_next_event' 'blk_mq_dispatch_rq_list' '__do_page_cache_readahead' '_find_next_bit' 'ep_poll' 'pcpu_alloc' 'add_timer' 'poll_schedule_timeout' 'audit_log_start' 'complete_signal' 'iput' 'atime_needs_update' 'tick_sched_do_timer' '__mark_inode_dirty' '__x64_sys_ptrace' '__delete_from_page_cache' 'file_update_time' 'page_counter_charge' 'do_nanosleep' 'do_signal_stop' 'ext4_setattr' 'ext4_free_inodes_count' 'blk_mq_get_request' 'ktime_get_real_seconds' 'futex_wait_queue_me' 'step_into' 'ext4_da_write_end' 'kauditd_thread' '__ext4_new_inode' 'echo_char' 'do_syslog' 'n_tty_receive_buf_common' '__filemap_fdatawrite_range' 'generic_write_end' 'mod_timer' 'generic_fillattr' 'exit_signals' 'do_wait' 'find_get_pages_range_tag' [ 156.999824][ T8936] ================================================================== [ 157.007958][ T8936] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 157.015830][ T8936] [ 157.018171][ T8936] write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 1: [ 157.025969][ T8936] timekeeping_advance+0x88e/0xd80 [ 157.031069][ T8936] update_wall_time+0x15/0x20 [ 157.035747][ T8936] tick_do_update_jiffies64+0x1e5/0x2a0 [ 157.041290][ T8936] tick_sched_do_timer+0xc7/0xd0 [ 157.046221][ T8936] tick_sched_timer+0x3f/0xd0 [ 157.050892][ T8936] __hrtimer_run_queues+0x271/0x600 [ 157.056073][ T8936] hrtimer_interrupt+0x226/0x490 [ 157.060987][ T8936] smp_apic_timer_interrupt+0xd8/0x270 [ 157.066418][ T8936] apic_timer_interrupt+0xf/0x20 [ 157.071347][ T8936] __tsan_read4+0x9a/0x110 [ 157.075737][ T8936] netif_receive_skb_list_internal+0x4e9/0x810 [ 157.081864][ T8936] gro_normal_list.part.0+0x37/0xa0 [ 157.087044][ T8936] gro_normal_one+0x14c/0x160 [ 157.091695][ T8936] napi_gro_receive+0x27d/0x2f0 [ 157.096558][ T8936] receive_buf+0x24c/0x3420 [ 157.101034][ T8936] virtnet_poll+0x343/0x790 [ 157.105556][ T8936] net_rx_action+0x3ad/0xac0 [ 157.110119][ T8936] __do_softirq+0x118/0x34a [ 157.114596][ T8936] run_ksoftirqd+0x41/0x60 [ 157.119109][ T8936] smpboot_thread_fn+0x374/0x4a0 [ 157.124018][ T8936] kthread+0x203/0x230 [ 157.128097][ T8936] ret_from_fork+0x1f/0x30 [ 157.132479][ T8936] [ 157.134785][ T8936] read to 0xffffffff88ae9140 of 8 bytes by task 8936 on cpu 0: [ 157.142335][ T8936] ktime_get_seconds+0x42/0x60 [ 157.147080][ T8936] tcp_rcv_established+0xe79/0xee0 [ 157.152160][ T8936] tcp_v4_do_rcv+0x396/0x4f0 [ 157.156931][ T8936] __release_sock+0x130/0x1e0 [ 157.161579][ T8936] release_sock+0x5e/0x160 [ 157.166023][ T8936] tcp_recvmsg+0x68e/0x1ba0 [ 157.170514][ T8936] inet_recvmsg+0xc1/0x250 [ 157.174907][ T8936] sock_recvmsg+0x8e/0xb0 [ 157.179219][ T8936] sock_read_iter+0x185/0x230 [ 157.183874][ T8936] new_sync_read+0x416/0x450 [ 157.188436][ T8936] __vfs_read+0x9e/0xb0 [ 157.192567][ T8936] vfs_read+0x13e/0x2b0 [ 157.196693][ T8936] ksys_read+0x16a/0x1a0 [ 157.200907][ T8936] __x64_sys_read+0x49/0x60 [ 157.205439][ T8936] do_syscall_64+0xc7/0x3b0 [ 157.209917][ T8936] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 157.215875][ T8936] [ 157.218222][ T8936] Reported by Kernel Concurrency Sanitizer on: [ 157.224363][ T8936] CPU: 0 PID: 8936 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 157.232767][ T8936] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 157.242884][ T8936] ================================================================== [ 157.250917][ T8936] Kernel panic - not syncing: panic_on_warn set ... [ 157.257477][ T8936] CPU: 0 PID: 8936 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 157.265692][ T8936] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 157.275717][ T8936] Call Trace: [ 157.278989][ T8936] dump_stack+0x11d/0x187 [ 157.283297][ T8936] panic+0x210/0x640 [ 157.287170][ T8936] ? vprintk_func+0x89/0x13a [ 157.291738][ T8936] kcsan_report.cold+0xc/0x1a [ 157.296395][ T8936] kcsan_setup_watchpoint+0x3fb/0x440 [ 157.301744][ T8936] ktime_get_seconds+0x42/0x60 [ 157.306505][ T8936] tcp_rcv_established+0xe79/0xee0 [ 157.311615][ T8936] tcp_v4_do_rcv+0x396/0x4f0 [ 157.316186][ T8936] __release_sock+0x130/0x1e0 [ 157.320886][ T8936] release_sock+0x5e/0x160 [ 157.325280][ T8936] tcp_recvmsg+0x68e/0x1ba0 [ 157.329772][ T8936] inet_recvmsg+0xc1/0x250 [ 157.334169][ T8936] ? apparmor_socket_recvmsg+0x38/0x40 [ 157.339605][ T8936] ? inet_sendpage+0xf0/0xf0 [ 157.344170][ T8936] sock_recvmsg+0x8e/0xb0 [ 157.348632][ T8936] sock_read_iter+0x185/0x230 [ 157.353292][ T8936] new_sync_read+0x416/0x450 [ 157.357864][ T8936] __vfs_read+0x9e/0xb0 [ 157.361998][ T8936] vfs_read+0x13e/0x2b0 [ 157.366267][ T8936] ksys_read+0x16a/0x1a0 [ 157.370484][ T8936] __x64_sys_read+0x49/0x60 [ 157.374967][ T8936] do_syscall_64+0xc7/0x3b0 [ 157.379450][ T8936] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 157.385316][ T8936] RIP: 0033:0x4b3cdb [ 157.389244][ T8936] 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 [ 157.408907][ T8936] RSP: 002b:000000c0002ad890 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 157.417335][ T8936] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 157.425283][ T8936] RDX: 0000000000001000 RSI: 000000c0002a2000 RDI: 0000000000000006 [ 157.433262][ T8936] RBP: 000000c0002ad8e0 R08: 0000000000000001 R09: 0000000000000002 [ 157.441244][ T8936] R10: 0000000000004147 R11: 0000000000000206 R12: 00000000000050e5 [ 157.449189][ T8936] R13: 0000000000000400 R14: 0000000000000004 R15: 0000000000000004 [ 157.458354][ T8936] Kernel Offset: disabled [ 157.462673][ T8936] Rebooting in 86400 seconds..