[info] Using makefile-style concurrent boot in runlevel 2. [ 42.658130][ T25] audit: type=1800 audit(1573883051.550:21): pid=7522 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 42.706901][ T25] audit: type=1800 audit(1573883051.550:22): pid=7522 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.127' (ECDSA) to the list of known hosts. 2019/11/16 05:44:22 fuzzer started 2019/11/16 05:44:24 dialing manager at 10.128.0.105:34521 2019/11/16 05:44:25 syscalls: 2566 2019/11/16 05:44:25 code coverage: enabled 2019/11/16 05:44:25 comparison tracing: enabled 2019/11/16 05:44:25 extra coverage: extra coverage is not supported by the kernel 2019/11/16 05:44:25 setuid sandbox: enabled 2019/11/16 05:44:25 namespace sandbox: enabled 2019/11/16 05:44:25 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/16 05:44:25 fault injection: enabled 2019/11/16 05:44:25 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/16 05:44:25 net packet injection: enabled 2019/11/16 05:44:25 net device setup: enabled 2019/11/16 05:44:25 concurrency sanitizer: enabled 2019/11/16 05:44:25 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 60.880768][ T7687] KCSAN: could not find function: 'poll_schedule_timeout' 2019/11/16 05:44:30 adding functions to KCSAN blacklist: 'find_next_bit' 'xas_clear_mark' 'rcu_gp_fqs_check_wake' 'kcm_ioctl' 'tcp_add_backlog' 'run_timer_softirq' 'tomoyo_supervisor' 'common_perm_cond' 'tick_sched_do_timer' 'blk_mq_dispatch_rq_list' 'copy_process' 'ext4_has_free_clusters' '__hrtimer_run_queues' 'dd_has_work' 'echo_char' 'do_nanosleep' 'poll_schedule_timeout' 'pipe_poll' 'pipe_wait' 'ep_poll' 'tick_nohz_next_event' 'pid_update_inode' 'generic_write_end' 'blk_mq_get_request' [ 76.555219][ T7675] ================================================================== [ 76.563355][ T7675] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 76.570268][ T7675] [ 76.572848][ T7675] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 76.580216][ T7675] timer_clear_idle+0x42/0x50 [ 76.584879][ T7675] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 76.590756][ T7675] tick_nohz_idle_exit+0x1af/0x1e0 [ 76.595849][ T7675] do_idle+0xb1/0x280 [ 76.599817][ T7675] cpu_startup_entry+0x1b/0x20 [ 76.604577][ T7675] start_secondary+0x168/0x1b0 [ 76.609411][ T7675] secondary_startup_64+0xa4/0xb0 [ 76.614408][ T7675] [ 76.617675][ T7675] read to 0xffff88812bf1b6e4 of 1 bytes by task 7675 on cpu 0: [ 76.625564][ T7675] mod_timer+0x50d/0x7a0 [ 76.630224][ T7675] sk_reset_timer+0x2d/0x70 [ 76.634724][ T7675] tcp_rearm_rto+0x1e7/0x2a0 [ 76.639324][ T7675] tcp_event_new_data_sent+0x218/0x220 [ 76.644762][ T7675] tcp_write_xmit+0xa77/0x3120 [ 76.649603][ T7675] __tcp_push_pending_frames+0x7b/0x1d0 [ 76.655136][ T7675] tcp_push+0x1e9/0x3d0 [ 76.659371][ T7675] tcp_sendmsg_locked+0x1d2b/0x1fb0 [ 76.664562][ T7675] tcp_sendmsg+0x39/0x60 [ 76.668833][ T7675] inet_sendmsg+0x6d/0x90 [ 76.673161][ T7675] sock_sendmsg+0x9f/0xc0 [ 76.677560][ T7675] sock_write_iter+0x16b/0x210 [ 76.682324][ T7675] new_sync_write+0x388/0x4a0 [ 76.686999][ T7675] __vfs_write+0xb1/0xc0 [ 76.691316][ T7675] vfs_write+0x18a/0x390 [ 76.695538][ T7675] ksys_write+0xd5/0x1b0 [ 76.699771][ T7675] __x64_sys_write+0x4c/0x60 [ 76.704362][ T7675] do_syscall_64+0xcc/0x370 [ 76.709924][ T7675] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 76.715795][ T7675] [ 76.718105][ T7675] Reported by Kernel Concurrency Sanitizer on: [ 76.724369][ T7675] CPU: 0 PID: 7675 Comm: syz-fuzzer Not tainted 5.4.0-rc7+ #0 [ 76.731817][ T7675] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.741854][ T7675] ================================================================== [ 76.749928][ T7675] Kernel panic - not syncing: panic_on_warn set ... [ 76.756496][ T7675] CPU: 0 PID: 7675 Comm: syz-fuzzer Not tainted 5.4.0-rc7+ #0 [ 76.764020][ T7675] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.774049][ T7675] Call Trace: [ 76.777324][ T7675] dump_stack+0x11d/0x181 [ 76.781654][ T7675] panic+0x210/0x640 [ 76.785538][ T7675] ? vprintk_func+0x8d/0x140 [ 76.790114][ T7675] kcsan_report.cold+0xc/0xd [ 76.794697][ T7675] kcsan_setup_watchpoint+0x3fe/0x460 [ 76.800076][ T7675] __tsan_read1+0xc2/0x100 [ 76.804474][ T7675] mod_timer+0x50d/0x7a0 [ 76.808703][ T7675] ? tcp_update_skb_after_send+0x1a6/0x260 [ 76.814508][ T7675] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 76.820744][ T7675] sk_reset_timer+0x2d/0x70 [ 76.825233][ T7675] tcp_rearm_rto+0x1e7/0x2a0 [ 76.829816][ T7675] tcp_event_new_data_sent+0x218/0x220 [ 76.835257][ T7675] tcp_write_xmit+0xa77/0x3120 [ 76.840010][ T7675] ? kmem_cache_alloc_node_trace+0x273/0x670 [ 76.845974][ T7675] __tcp_push_pending_frames+0x7b/0x1d0 [ 76.851497][ T7675] tcp_push+0x1e9/0x3d0 [ 76.855638][ T7675] tcp_sendmsg_locked+0x1d2b/0x1fb0 [ 76.861020][ T7675] tcp_sendmsg+0x39/0x60 [ 76.865547][ T7675] inet_sendmsg+0x6d/0x90 [ 76.870319][ T7675] ? inet_send_prepare+0x200/0x200 [ 76.875594][ T7675] sock_sendmsg+0x9f/0xc0 [ 76.879912][ T7675] sock_write_iter+0x16b/0x210 [ 76.884668][ T7675] new_sync_write+0x388/0x4a0 [ 76.889418][ T7675] __vfs_write+0xb1/0xc0 [ 76.893648][ T7675] vfs_write+0x18a/0x390 [ 76.897871][ T7675] ksys_write+0xd5/0x1b0 [ 76.902100][ T7675] __x64_sys_write+0x4c/0x60 [ 76.906683][ T7675] do_syscall_64+0xcc/0x370 [ 76.911446][ T7675] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 76.917314][ T7675] RIP: 0033:0x47c530 [ 76.921193][ T7675] 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 [ 76.940788][ T7675] RSP: 002b:000000c4221814f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 76.949350][ T7675] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 76.957297][ T7675] RDX: 0000000000000007 RSI: 000000c4202da200 RDI: 0000000000000003 [ 76.965264][ T7675] RBP: 000000c422181550 R08: 0000000000000000 R09: 0000000000000000 [ 76.973231][ T7675] R10: 0000000000000000 R11: 0000000000000216 R12: 000000c4200c3b00 [ 76.981180][ T7675] R13: 0000000000000007 R14: 0000000000c1ec00 R15: 0000000000000ae0 [ 78.123749][ T7675] Shutting down cpus with NMI [ 78.130209][ T7675] Kernel Offset: disabled [ 78.134540][ T7675] Rebooting in 86400 seconds..