[info] Using makefile-style concurrent boot in runlevel 2. [ 47.215435][ T26] audit: type=1800 audit(1578826483.977:21): pid=7753 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 47.271634][ T26] audit: type=1800 audit(1578826483.987:22): pid=7753 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 '10.128.0.67' (ECDSA) to the list of known hosts. 2020/01/12 10:54:54 fuzzer started 2020/01/12 10:54:56 dialing manager at 10.128.0.105:36121 2020/01/12 10:54:57 syscalls: 2814 2020/01/12 10:54:57 code coverage: enabled 2020/01/12 10:54:57 comparison tracing: enabled 2020/01/12 10:54:57 extra coverage: enabled 2020/01/12 10:54:57 setuid sandbox: enabled 2020/01/12 10:54:57 namespace sandbox: enabled 2020/01/12 10:54:57 Android sandbox: /sys/fs/selinux/policy does not exist 2020/01/12 10:54:57 fault injection: enabled 2020/01/12 10:54:57 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/01/12 10:54:57 net packet injection: enabled 2020/01/12 10:54:57 net device setup: enabled 2020/01/12 10:54:57 concurrency sanitizer: enabled 2020/01/12 10:54:57 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/01/12 10:55:00 adding functions to KCSAN blacklist: 'ep_poll' 'run_timer_softirq' 'tick_sched_do_timer' '__rb_erase_color' 'find_get_pages_range_tag' 'dd_has_work' 'tomoyo_supervisor' 'add_timer' 'xas_clear_mark' 'alloc_empty_file' 'rcu_gp_fqs_check_wake' 'blk_mq_dispatch_rq_list' '__hrtimer_run_queues' '__ext4_new_inode' 'find_next_bit' 'pcpu_alloc' 'tick_do_update_jiffies64' 'blk_mq_sched_dispatch_requests' syzkaller login: [ 73.098924][ T7910] ================================================================== [ 73.107139][ T7910] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 73.114050][ T7910] [ 73.116364][ T7910] write to 0xffff88812c01daa4 of 1 bytes by task 0 on cpu 0: [ 73.123828][ T7910] timer_clear_idle+0x42/0x50 [ 73.128494][ T7910] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 73.135326][ T7910] tick_nohz_idle_exit+0x1af/0x1e0 [ 73.140420][ T7910] do_idle+0xb1/0x290 [ 73.144408][ T7910] cpu_startup_entry+0x1b/0x20 [ 73.149152][ T7910] rest_init+0xec/0xf6 [ 73.153202][ T7910] arch_call_rest_init+0x17/0x37 [ 73.158121][ T7910] start_kernel+0x838/0x85e [ 73.162619][ T7910] x86_64_start_reservations+0x29/0x2b [ 73.168059][ T7910] x86_64_start_kernel+0x72/0x76 [ 73.172976][ T7910] secondary_startup_64+0xa4/0xb0 [ 73.177971][ T7910] [ 73.180285][ T7910] read to 0xffff88812c01daa4 of 1 bytes by task 7910 on cpu 1: [ 73.187806][ T7910] mod_timer+0x50d/0x7a0 [ 73.192030][ T7910] sk_reset_timer+0x2d/0xd0 [ 73.196518][ T7910] tcp_rearm_rto+0x1e7/0x2a0 [ 73.201103][ T7910] tcp_event_new_data_sent+0x218/0x220 [ 73.206543][ T7910] tcp_write_xmit+0xa97/0x3190 [ 73.211288][ T7910] __tcp_push_pending_frames+0x7b/0x1d0 [ 73.217158][ T7910] tcp_push+0x1f7/0x3e0 [ 73.221294][ T7910] tcp_sendmsg_locked+0x1d71/0x2040 [ 73.226470][ T7910] tcp_sendmsg+0x39/0x60 [ 73.230693][ T7910] inet_sendmsg+0x6d/0x90 [ 73.235021][ T7910] sock_sendmsg+0x9f/0xc0 [ 73.239354][ T7910] sock_write_iter+0x16b/0x210 [ 73.244100][ T7910] new_sync_write+0x388/0x4a0 [ 73.248775][ T7910] __vfs_write+0xb1/0xc0 [ 73.253004][ T7910] vfs_write+0x18a/0x390 [ 73.257274][ T7910] ksys_write+0x17b/0x1b0 [ 73.261689][ T7910] __x64_sys_write+0x4c/0x60 [ 73.266263][ T7910] do_syscall_64+0xcc/0x3a0 [ 73.271819][ T7910] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 73.277682][ T7910] [ 73.279989][ T7910] Reported by Kernel Concurrency Sanitizer on: [ 73.286125][ T7910] CPU: 1 PID: 7910 Comm: syz-fuzzer Not tainted 5.5.0-rc1-syzkaller #0 [ 73.294337][ T7910] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.304391][ T7910] ================================================================== [ 73.312489][ T7910] Kernel panic - not syncing: panic_on_warn set ... [ 73.319066][ T7910] CPU: 1 PID: 7910 Comm: syz-fuzzer Not tainted 5.5.0-rc1-syzkaller #0 [ 73.328409][ T7910] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.338530][ T7910] Call Trace: [ 73.341803][ T7910] dump_stack+0x11d/0x181 [ 73.346118][ T7910] panic+0x210/0x640 [ 73.350012][ T7910] ? vprintk_func+0x8d/0x140 [ 73.354614][ T7910] kcsan_report.cold+0xc/0xd [ 73.359592][ T7910] kcsan_setup_watchpoint+0x3fe/0x460 [ 73.364987][ T7910] __tsan_read1+0xc2/0x100 [ 73.369403][ T7910] mod_timer+0x50d/0x7a0 [ 73.373639][ T7910] ? tcp_update_skb_after_send+0x1a6/0x260 [ 73.380391][ T7910] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.387579][ T7910] sk_reset_timer+0x2d/0xd0 [ 73.392086][ T7910] tcp_rearm_rto+0x1e7/0x2a0 [ 73.396674][ T7910] tcp_event_new_data_sent+0x218/0x220 [ 73.402126][ T7910] tcp_write_xmit+0xa97/0x3190 [ 73.406891][ T7910] ? kmem_cache_alloc_node_trace+0x273/0x670 [ 73.412978][ T7910] __tcp_push_pending_frames+0x7b/0x1d0 [ 73.418509][ T7910] tcp_push+0x1f7/0x3e0 [ 73.422739][ T7910] tcp_sendmsg_locked+0x1d71/0x2040 [ 73.427928][ T7910] tcp_sendmsg+0x39/0x60 [ 73.432160][ T7910] inet_sendmsg+0x6d/0x90 [ 73.436472][ T7910] ? inet_send_prepare+0x200/0x200 [ 73.442438][ T7910] sock_sendmsg+0x9f/0xc0 [ 73.446765][ T7910] sock_write_iter+0x16b/0x210 [ 73.451514][ T7910] new_sync_write+0x388/0x4a0 [ 73.456281][ T7910] __vfs_write+0xb1/0xc0 [ 73.460524][ T7910] vfs_write+0x18a/0x390 [ 73.464750][ T7910] ksys_write+0x17b/0x1b0 [ 73.469064][ T7910] __x64_sys_write+0x4c/0x60 [ 73.473637][ T7910] do_syscall_64+0xcc/0x3a0 [ 73.478394][ T7910] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 73.484292][ T7910] RIP: 0033:0x47c530 [ 73.488807][ T7910] 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 [ 73.508641][ T7910] RSP: 002b:000000c4204334f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 73.517146][ T7910] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 73.525102][ T7910] RDX: 0000000000000007 RSI: 000000c4203d8020 RDI: 0000000000000003 [ 73.533053][ T7910] RBP: 000000c420433550 R08: 0000000000000000 R09: 0000000000000000 [ 73.541006][ T7910] R10: 0000000000000000 R11: 0000000000000216 R12: 000000c4200c3b00 [ 73.548958][ T7910] R13: 0000000000000007 R14: 0000000000c65a20 R15: 0000000000001c99 [ 74.667822][ T7910] Shutting down cpus with NMI [ 74.674020][ T7910] Kernel Offset: disabled [ 74.678349][ T7910] Rebooting in 86400 seconds..