[ 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 '10.128.0.175' (ECDSA) to the list of known hosts. 2020/05/14 13:25:10 fuzzer started 2020/05/14 13:25:10 dialing manager at 10.128.0.105:44163 2020/05/14 13:25:11 syscalls: 3055 2020/05/14 13:25:11 code coverage: enabled 2020/05/14 13:25:11 comparison tracing: enabled 2020/05/14 13:25:11 extra coverage: enabled 2020/05/14 13:25:11 setuid sandbox: enabled 2020/05/14 13:25:11 namespace sandbox: enabled 2020/05/14 13:25:11 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/14 13:25:11 fault injection: enabled 2020/05/14 13:25:11 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/14 13:25:11 net packet injection: enabled 2020/05/14 13:25:11 net device setup: enabled 2020/05/14 13:25:11 concurrency sanitizer: enabled 2020/05/14 13:25:11 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/14 13:25:11 USB emulation: enabled syzkaller login: [ 51.889347][ T8923] KCSAN: could not find function: '_find_next_bit' [ 52.576343][ T8923] KCSAN: could not find function: 'poll_schedule_timeout' 2020/05/14 13:25:15 adding functions to KCSAN blacklist: 'alloc_pid' 'add_timer' 'shmem_file_read_iter' 'xas_find_marked' 'blk_mq_dispatch_rq_list' 'do_nanosleep' 'tick_nohz_idle_stop_tick' 'ext4_free_inodes_count' 'tick_sched_do_timer' 'wbt_done' 'copy_process' 'commit_echoes' '__delete_from_page_cache' 'ep_poll' 'do_signal_stop' 'ext4_da_write_end' '__get_user_pages' 'find_get_pages_range_tag' '_find_next_bit' '__synchronize_hardirq' 'mod_timer' 'poll_schedule_timeout' 'ext4_mb_find_by_goal' 'run_timer_softirq' 'generic_fillattr' 'ktime_get_real_seconds' 'page_counter_charge' 'echo_char' 'tick_nohz_next_event' '__perf_event_overflow' '__ext4_new_inode' 'generic_write_end' 'ext4_mark_iloc_dirty' 'dccp_rcv_reset' 'yama_ptracer_del' [ 215.999608][ T8924] ================================================================== [ 216.007759][ T8924] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 216.015723][ T8924] [ 216.018054][ T8924] write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 1: [ 216.025944][ T8924] timekeeping_advance+0x88e/0xd80 [ 216.031053][ T8924] update_wall_time+0x15/0x20 [ 216.035740][ T8924] tick_do_update_jiffies64+0x1e5/0x2a0 [ 216.041367][ T8924] tick_sched_do_timer+0xc7/0xd0 [ 216.046486][ T8924] tick_sched_timer+0x3f/0xd0 [ 216.051155][ T8924] __hrtimer_run_queues+0x271/0x600 [ 216.056355][ T8924] hrtimer_interrupt+0x226/0x490 [ 216.061288][ T8924] smp_apic_timer_interrupt+0xd8/0x270 [ 216.066724][ T8924] apic_timer_interrupt+0xf/0x20 [ 216.071649][ T8924] __tsan_read4+0xe4/0x110 [ 216.076066][ T8924] ip_rcv_finish_core.isra.0+0x2b6/0xcb0 [ 216.081781][ T8924] ip_sublist_rcv+0x167/0x530 [ 216.086432][ T8924] ip_list_rcv+0x2f3/0x321 [ 216.090838][ T8924] __netif_receive_skb_list_core+0x368/0x5c0 [ 216.097233][ T8924] netif_receive_skb_list_internal+0x5c7/0x810 [ 216.103373][ T8924] gro_normal_list.part.0+0x37/0xa0 [ 216.108550][ T8924] gro_normal_one+0x14c/0x160 [ 216.113211][ T8924] napi_gro_receive+0x27d/0x2f0 [ 216.118041][ T8924] receive_buf+0x24c/0x3420 [ 216.123087][ T8924] virtnet_poll+0x343/0x790 [ 216.127570][ T8924] net_rx_action+0x3ad/0xac0 [ 216.132136][ T8924] __do_softirq+0x118/0x34a [ 216.136615][ T8924] run_ksoftirqd+0x41/0x60 [ 216.141114][ T8924] smpboot_thread_fn+0x374/0x4a0 [ 216.146042][ T8924] kthread+0x203/0x230 [ 216.150088][ T8924] ret_from_fork+0x1f/0x30 [ 216.154492][ T8924] [ 216.156813][ T8924] read to 0xffffffff88ae9140 of 8 bytes by task 8924 on cpu 0: [ 216.164489][ T8924] ktime_get_seconds+0x42/0x60 [ 216.169243][ T8924] tcp_rcv_established+0xe79/0xee0 [ 216.174340][ T8924] tcp_v4_do_rcv+0x396/0x4f0 [ 216.178911][ T8924] __release_sock+0x130/0x1e0 [ 216.183569][ T8924] release_sock+0x5e/0x160 [ 216.190135][ T8924] tcp_recvmsg+0x68e/0x1ba0 [ 216.194625][ T8924] inet_recvmsg+0xc1/0x250 [ 216.199115][ T8924] sock_recvmsg+0x8e/0xb0 [ 216.203537][ T8924] sock_read_iter+0x185/0x230 [ 216.208287][ T8924] new_sync_read+0x416/0x450 [ 216.212885][ T8924] __vfs_read+0x9e/0xb0 [ 216.217028][ T8924] vfs_read+0x13e/0x2b0 [ 216.221167][ T8924] ksys_read+0x16a/0x1a0 [ 216.225395][ T8924] __x64_sys_read+0x49/0x60 [ 216.229880][ T8924] do_syscall_64+0xc7/0x3b0 [ 216.234360][ T8924] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 216.240229][ T8924] [ 216.242542][ T8924] Reported by Kernel Concurrency Sanitizer on: [ 216.248765][ T8924] CPU: 0 PID: 8924 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 216.256974][ T8924] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 216.267010][ T8924] ================================================================== [ 216.277687][ T8924] Kernel panic - not syncing: panic_on_warn set ... [ 216.284257][ T8924] CPU: 0 PID: 8924 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 216.292551][ T8924] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 216.302577][ T8924] Call Trace: [ 216.305849][ T8924] dump_stack+0x11d/0x187 [ 216.310158][ T8924] panic+0x210/0x640 [ 216.314046][ T8924] ? vprintk_func+0x89/0x13a [ 216.318633][ T8924] kcsan_report.cold+0xc/0x1a [ 216.323312][ T8924] kcsan_setup_watchpoint+0x3fb/0x440 [ 216.328705][ T8924] ktime_get_seconds+0x42/0x60 [ 216.333535][ T8924] tcp_rcv_established+0xe79/0xee0 [ 216.338625][ T8924] tcp_v4_do_rcv+0x396/0x4f0 [ 216.343206][ T8924] __release_sock+0x130/0x1e0 [ 216.347864][ T8924] release_sock+0x5e/0x160 [ 216.352441][ T8924] tcp_recvmsg+0x68e/0x1ba0 [ 216.356934][ T8924] inet_recvmsg+0xc1/0x250 [ 216.361355][ T8924] ? apparmor_socket_recvmsg+0x38/0x40 [ 216.366806][ T8924] ? inet_sendpage+0xf0/0xf0 [ 216.371383][ T8924] sock_recvmsg+0x8e/0xb0 [ 216.375782][ T8924] sock_read_iter+0x185/0x230 [ 216.380443][ T8924] new_sync_read+0x416/0x450 [ 216.385029][ T8924] __vfs_read+0x9e/0xb0 [ 216.389222][ T8924] vfs_read+0x13e/0x2b0 [ 216.393368][ T8924] ksys_read+0x16a/0x1a0 [ 216.397622][ T8924] __x64_sys_read+0x49/0x60 [ 216.402111][ T8924] do_syscall_64+0xc7/0x3b0 [ 216.407299][ T8924] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 216.413429][ T8924] RIP: 0033:0x47c530 [ 216.417304][ T8924] 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 [ 216.436892][ T8924] RSP: 002b:000000c4204d3810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 216.445281][ T8924] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 216.453319][ T8924] RDX: 0000000000001000 RSI: 000000c4201d6000 RDI: 0000000000000003 [ 216.461277][ T8924] RBP: 000000c4204d3868 R08: 0000000000000000 R09: 0000000000000000 [ 216.469248][ T8924] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000100 [ 216.477199][ T8924] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 216.486800][ T8924] Kernel Offset: disabled [ 216.491119][ T8924] Rebooting in 86400 seconds..