[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.701647][ T26] audit: type=1800 audit(1572818897.059:25): pid=7109 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.722402][ T26] audit: type=1800 audit(1572818897.059:26): pid=7109 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.722417][ T26] audit: type=1800 audit(1572818897.059:27): pid=7109 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.201' (ECDSA) to the list of known hosts. 2019/11/03 22:08:28 fuzzer started 2019/11/03 22:08:29 dialing manager at 10.128.0.105:42255 2019/11/03 22:08:29 syscalls: 2553 2019/11/03 22:08:29 code coverage: enabled 2019/11/03 22:08:29 comparison tracing: enabled 2019/11/03 22:08:29 extra coverage: extra coverage is not supported by the kernel 2019/11/03 22:08:29 setuid sandbox: enabled 2019/11/03 22:08:29 namespace sandbox: enabled 2019/11/03 22:08:29 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/03 22:08:29 fault injection: enabled 2019/11/03 22:08:29 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/03 22:08:29 net packet injection: enabled 2019/11/03 22:08:29 net device setup: enabled 2019/11/03 22:08:29 concurrency sanitizer: enabled 2019/11/03 22:08:29 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 53.315977][ T7277] KCSAN: could not find function: 'poll_schedule_timeout' 2019/11/03 22:08:41 adding functions to KCSAN blacklist: 'blk_mq_dispatch_rq_list' 'ep_poll' 'tick_do_update_jiffies64' 'ext4_free_inodes_count' 'get_wchan' 'fsnotify' 'ext4_nonda_switch' 'mod_timer' 'generic_permission' '__tcp_select_window' 'tick_nohz_idle_stop_tick' 'blk_mq_run_hw_queue' 'pid_update_inode' 'ktime_get_real_seconds' 'blk_stat_add' '__nf_ct_refresh_acct' 'do_nanosleep' '__ext4_new_inode' '__hrtimer_run_queues' '__splice_from_pipe' 'run_timer_softirq' 'update_defense_level' 'poll_schedule_timeout' 'ext4_free_inode' 'tcp_add_backlog' 'snd_seq_prioq_cell_out' 'xas_find_marked' '__nf_conntrack_find_get' 'rcu_gp_fqs_check_wake' 'kauditd_thread' 'taskstats_exit' 'snapshot_refaults' 'wbt_issue' '__snd_rawmidi_transmit_ack' 'pipe_poll' 'tick_sched_do_timer' 'generic_fillattr' 'task_dump_owner' 'generic_write_end' 'find_next_bit' 'vm_area_dup' 'dd_has_work' 'audit_log_start' 'file_update_time' 'rcu_gp_fqs_loop' 'xas_clear_mark' 'tomoyo_supervisor' 'blk_mq_sched_dispatch_requests' 'blk_mq_get_request' 'tcp_poll' '__delete_from_page_cache' 'n_tty_receive_buf_common' 'find_get_pages_range_tag' 'add_timer' [ 85.646656][ T7263] ================================================================== [ 85.654804][ T7263] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 85.662685][ T7263] [ 85.665015][ T7263] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 0: [ 85.672813][ T7263] timekeeping_advance+0x893/0xd80 [ 85.677921][ T7263] update_wall_time+0x19/0x20 [ 85.682686][ T7263] tick_do_update_jiffies64+0x1ae/0x260 [ 85.688321][ T7263] tick_sched_do_timer+0xd4/0xe0 [ 85.693273][ T7263] tick_sched_timer+0x43/0xe0 [ 85.697928][ T7263] __hrtimer_run_queues+0x288/0x600 [ 85.703102][ T7263] hrtimer_interrupt+0x22a/0x480 [ 85.708058][ T7263] smp_apic_timer_interrupt+0xdc/0x280 [ 85.713493][ T7263] apic_timer_interrupt+0xf/0x20 [ 85.718407][ T7263] __kcsan_check_watchpoint+0xec/0x180 [ 85.723839][ T7263] __tsan_write4+0x18/0x40 [ 85.728230][ T7263] skb_gro_reset_offset+0x7e/0x1a0 [ 85.733314][ T7263] napi_gro_receive+0x71/0x330 [ 85.738052][ T7263] receive_buf+0x284/0x30b0 [ 85.742562][ T7263] [ 85.744871][ T7263] read to 0xffffffff86040b80 of 8 bytes by task 7263 on cpu 1: [ 85.752387][ T7263] ktime_get_seconds+0x45/0x70 [ 85.757128][ T7263] tcp_rcv_established+0xeeb/0xf50 [ 85.762259][ T7263] tcp_v4_do_rcv+0x381/0x4e0 [ 85.766824][ T7263] __release_sock+0x135/0x1e0 [ 85.771475][ T7263] release_sock+0x61/0x160 [ 85.775869][ T7263] tcp_recvmsg+0x63b/0x1a30 [ 85.780347][ T7263] inet_recvmsg+0xbb/0x250 [ 85.784740][ T7263] sock_recvmsg+0x92/0xb0 [ 85.789045][ T7263] sock_read_iter+0x15f/0x1e0 [ 85.793693][ T7263] new_sync_read+0x389/0x4f0 [ 85.798256][ T7263] __vfs_read+0xb1/0xc0 [ 85.802386][ T7263] vfs_read+0x143/0x2c0 [ 85.806524][ T7263] ksys_read+0xd5/0x1b0 [ 85.810647][ T7263] [ 85.812962][ T7263] Reported by Kernel Concurrency Sanitizer on: [ 85.819103][ T7263] CPU: 1 PID: 7263 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 85.826810][ T7263] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.836883][ T7263] ================================================================== [ 85.844921][ T7263] Kernel panic - not syncing: panic_on_warn set ... [ 85.851542][ T7263] CPU: 1 PID: 7263 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 85.858970][ T7263] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.869035][ T7263] Call Trace: [ 85.872306][ T7263] dump_stack+0xf5/0x159 [ 85.876544][ T7263] panic+0x210/0x640 [ 85.880425][ T7263] ? sock_read_iter+0x15f/0x1e0 [ 85.885252][ T7263] ? vprintk_func+0x8d/0x140 [ 85.889820][ T7263] kcsan_report.cold+0xc/0x10 [ 85.894484][ T7263] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 85.900007][ T7263] __tsan_read8+0x2c/0x30 [ 85.904313][ T7263] ktime_get_seconds+0x45/0x70 [ 85.909146][ T7263] tcp_rcv_established+0xeeb/0xf50 [ 85.914237][ T7263] ? ipv4_dst_check+0xc6/0xf0 [ 85.918895][ T7263] tcp_v4_do_rcv+0x381/0x4e0 [ 85.923473][ T7263] __release_sock+0x135/0x1e0 [ 85.928126][ T7263] release_sock+0x61/0x160 [ 85.932530][ T7263] tcp_recvmsg+0x63b/0x1a30 [ 85.937030][ T7263] inet_recvmsg+0xbb/0x250 [ 85.941420][ T7263] ? __tsan_read8+0x2c/0x30 [ 85.945901][ T7263] ? inet_sendpage+0x100/0x100 [ 85.950640][ T7263] sock_recvmsg+0x92/0xb0 [ 85.954948][ T7263] sock_read_iter+0x15f/0x1e0 [ 85.959611][ T7263] new_sync_read+0x389/0x4f0 [ 85.964189][ T7263] __vfs_read+0xb1/0xc0 [ 85.968318][ T7263] vfs_read+0x143/0x2c0 [ 85.972462][ T7263] ksys_read+0xd5/0x1b0 [ 85.976610][ T7263] __x64_sys_read+0x4c/0x60 [ 85.981096][ T7263] do_syscall_64+0xcc/0x370 [ 85.985587][ T7263] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 85.991859][ T7263] RIP: 0033:0x47c530 [ 85.995800][ T7263] 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 [ 86.015394][ T7263] RSP: 002b:000000c4204fb7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 86.023787][ T7263] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 86.031734][ T7263] RDX: 0000000000001000 RSI: 000000c42036a000 RDI: 0000000000000003 [ 86.039682][ T7263] RBP: 000000c4204fb830 R08: 0000000000000000 R09: 0000000000000000 [ 86.047630][ T7263] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000010 [ 86.055578][ T7263] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 86.064937][ T7263] Kernel Offset: disabled [ 86.069318][ T7263] Rebooting in 86400 seconds..