[ 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 '10.128.0.243' (ECDSA) to the list of known hosts. 2020/05/15 18:46:29 fuzzer started 2020/05/15 18:46:30 dialing manager at 10.128.0.105:37863 2020/05/15 18:46:30 syscalls: 3055 2020/05/15 18:46:30 code coverage: enabled 2020/05/15 18:46:30 comparison tracing: enabled 2020/05/15 18:46:30 extra coverage: enabled 2020/05/15 18:46:30 setuid sandbox: enabled 2020/05/15 18:46:30 namespace sandbox: enabled 2020/05/15 18:46:30 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/15 18:46:30 fault injection: enabled 2020/05/15 18:46:30 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/15 18:46:30 net packet injection: enabled 2020/05/15 18:46:30 net device setup: enabled 2020/05/15 18:46:30 concurrency sanitizer: enabled 2020/05/15 18:46:30 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/15 18:46:30 USB emulation: enabled syzkaller login: [ 49.045340][ T8921] KCSAN: could not find function: '_find_next_bit' [ 52.063766][ T8921] KCSAN: could not find function: 'poll_schedule_timeout' 2020/05/15 18:46:35 adding functions to KCSAN blacklist: 'pcpu_alloc' 'ext4_free_inodes_count' '_find_next_bit' '__mpage_writepage' 'tick_sched_do_timer' '__snd_rawmidi_transmit_ack' 'audit_log_start' 'do_nanosleep' 'shmem_file_read_iter' 'blk_mq_get_request' 'ktime_get_real_seconds' 'ext4_writepages' 'do_syslog' '__perf_event_overflow' 'do_signal_stop' 'generic_fillattr' 'run_timer_softirq' '__add_to_page_cache_locked' 'dd_has_work' 'blk_mq_sched_dispatch_requests' 'ep_poll' 'tick_nohz_next_event' 'blk_mq_dispatch_rq_list' 'mod_timer' 'poll_schedule_timeout' 'copy_process' 'find_get_pages_range_tag' 'generic_write_end' 'xas_clear_mark' 'kauditd_thread' 'ext4_mark_iloc_dirty' '__filemap_fdatawrite_range' 'generic_file_read_iter' 'wbt_done' '__ext4_new_inode' 'page_counter_charge' 'tick_nohz_idle_stop_tick' 'futex_wait_queue_me' 'do_exit' 'vm_area_dup' 'do_wait' 'add_timer' [ 115.008157][ T8923] ================================================================== [ 115.016427][ T8923] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 115.024390][ T8923] [ 115.026710][ T8923] write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 0: [ 115.034581][ T8923] timekeeping_advance+0x88e/0xd80 [ 115.039858][ T8923] update_wall_time+0x15/0x20 [ 115.044524][ T8923] tick_do_update_jiffies64+0x1e5/0x2a0 [ 115.050104][ T8923] tick_sched_do_timer+0xc7/0xd0 [ 115.055154][ T8923] tick_sched_timer+0x3f/0xd0 [ 115.059817][ T8923] __hrtimer_run_queues+0x271/0x600 [ 115.064998][ T8923] hrtimer_interrupt+0x226/0x490 [ 115.069923][ T8923] smp_apic_timer_interrupt+0xd8/0x270 [ 115.075366][ T8923] apic_timer_interrupt+0xf/0x20 [ 115.080294][ T8923] kcsan_setup_watchpoint+0x25a/0x440 [ 115.085712][ T8923] skb_gro_reset_offset+0x47/0x180 [ 115.090956][ T8923] napi_gro_receive+0x6b/0x2f0 [ 115.095984][ T8923] receive_buf+0x24c/0x3420 [ 115.100474][ T8923] virtnet_poll+0x343/0x790 [ 115.105026][ T8923] net_rx_action+0x3ad/0xac0 [ 115.109604][ T8923] __do_softirq+0x118/0x34a [ 115.114207][ T8923] run_ksoftirqd+0x41/0x60 [ 115.118610][ T8923] smpboot_thread_fn+0x374/0x4a0 [ 115.123544][ T8923] kthread+0x203/0x230 [ 115.127606][ T8923] ret_from_fork+0x1f/0x30 [ 115.132454][ T8923] [ 115.134770][ T8923] read to 0xffffffff88ae9140 of 8 bytes by task 8923 on cpu 1: [ 115.142358][ T8923] ktime_get_seconds+0x42/0x60 [ 115.147111][ T8923] tcp_rcv_established+0xe79/0xee0 [ 115.152208][ T8923] tcp_v4_do_rcv+0x396/0x4f0 [ 115.156780][ T8923] __release_sock+0x130/0x1e0 [ 115.161441][ T8923] release_sock+0x5e/0x160 [ 115.165844][ T8923] tcp_recvmsg+0x68e/0x1ba0 [ 115.170377][ T8923] inet_recvmsg+0xc1/0x250 [ 115.174778][ T8923] sock_recvmsg+0x8e/0xb0 [ 115.179234][ T8923] sock_read_iter+0x185/0x230 [ 115.184116][ T8923] new_sync_read+0x416/0x450 [ 115.188694][ T8923] __vfs_read+0x9e/0xb0 [ 115.192836][ T8923] vfs_read+0x13e/0x2b0 [ 115.197010][ T8923] ksys_read+0x16a/0x1a0 [ 115.201240][ T8923] __x64_sys_read+0x49/0x60 [ 115.206457][ T8923] do_syscall_64+0xc7/0x3b0 [ 115.210947][ T8923] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 115.216816][ T8923] [ 115.219128][ T8923] Reported by Kernel Concurrency Sanitizer on: [ 115.225268][ T8923] CPU: 1 PID: 8923 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 115.234130][ T8923] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 115.244309][ T8923] ================================================================== [ 115.252357][ T8923] Kernel panic - not syncing: panic_on_warn set ... [ 115.258933][ T8923] CPU: 1 PID: 8923 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 115.267159][ T8923] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 115.277284][ T8923] Call Trace: [ 115.280569][ T8923] dump_stack+0x11d/0x187 [ 115.284996][ T8923] panic+0x210/0x640 [ 115.289134][ T8923] ? vprintk_func+0x89/0x13a [ 115.293713][ T8923] kcsan_report.cold+0xc/0x1a [ 115.298463][ T8923] kcsan_setup_watchpoint+0x3fb/0x440 [ 115.303860][ T8923] ktime_get_seconds+0x42/0x60 [ 115.308614][ T8923] tcp_rcv_established+0xe79/0xee0 [ 115.313735][ T8923] tcp_v4_do_rcv+0x396/0x4f0 [ 115.318325][ T8923] __release_sock+0x130/0x1e0 [ 115.322998][ T8923] release_sock+0x5e/0x160 [ 115.327403][ T8923] tcp_recvmsg+0x68e/0x1ba0 [ 115.331946][ T8923] inet_recvmsg+0xc1/0x250 [ 115.336353][ T8923] ? apparmor_socket_recvmsg+0x38/0x40 [ 115.342140][ T8923] ? inet_sendpage+0xf0/0xf0 [ 115.346773][ T8923] sock_recvmsg+0x8e/0xb0 [ 115.351093][ T8923] sock_read_iter+0x185/0x230 [ 115.355944][ T8923] new_sync_read+0x416/0x450 [ 115.360526][ T8923] __vfs_read+0x9e/0xb0 [ 115.364726][ T8923] vfs_read+0x13e/0x2b0 [ 115.368869][ T8923] ksys_read+0x16a/0x1a0 [ 115.373129][ T8923] __x64_sys_read+0x49/0x60 [ 115.377627][ T8923] do_syscall_64+0xc7/0x3b0 [ 115.382249][ T8923] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 115.388137][ T8923] RIP: 0033:0x47c530 [ 115.392028][ T8923] 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 [ 115.411624][ T8923] RSP: 002b:000000c4201c3810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 115.420154][ T8923] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 115.428127][ T8923] RDX: 0000000000001000 RSI: 000000c4202f8000 RDI: 0000000000000003 [ 115.436452][ T8923] RBP: 000000c4201c3868 R08: 0000000000000000 R09: 0000000000000000 [ 115.444793][ T8923] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000010 [ 115.453186][ T8923] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 115.462818][ T8923] Kernel Offset: disabled [ 115.467234][ T8923] Rebooting in 86400 seconds..