[info] Using makefile-style concurrent boot in runlevel 2. [ 41.746167][ T26] audit: type=1800 audit(1573881826.522:21): pid=7521 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 41.794960][ T26] audit: type=1800 audit(1573881826.522:22): pid=7521 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 '10.128.0.213' (ECDSA) to the list of known hosts. 2019/11/16 05:23:57 fuzzer started 2019/11/16 05:23:59 dialing manager at 10.128.0.105:34521 2019/11/16 05:23:59 syscalls: 2566 2019/11/16 05:23:59 code coverage: enabled 2019/11/16 05:23:59 comparison tracing: enabled 2019/11/16 05:23:59 extra coverage: extra coverage is not supported by the kernel 2019/11/16 05:23:59 setuid sandbox: enabled 2019/11/16 05:23:59 namespace sandbox: enabled 2019/11/16 05:23:59 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/16 05:23:59 fault injection: enabled 2019/11/16 05:23:59 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/16 05:23:59 net packet injection: enabled 2019/11/16 05:23:59 net device setup: enabled 2019/11/16 05:23:59 concurrency sanitizer: enabled 2019/11/16 05:23:59 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/16 05:24:00 adding functions to KCSAN blacklist: 'tcp_add_backlog' 'run_timer_softirq' 'ep_poll' 'pipe_poll' 'pipe_wait' '__hrtimer_run_queues' 'xas_clear_mark' 'find_next_bit' 'ext4_has_free_clusters' syzkaller login: [ 56.865052][ T0] ================================================================== [ 56.873327][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 56.881467][ T0] [ 56.883889][ T0] write to 0xffffffff85cb3ad0 of 4 bytes by interrupt on cpu 1: [ 56.891635][ T0] tick_sched_do_timer+0xc0/0xe0 [ 56.896577][ T0] tick_sched_timer+0x43/0xe0 [ 56.901245][ T0] __hrtimer_run_queues+0x274/0x5f0 [ 56.906468][ T0] hrtimer_interrupt+0x22a/0x480 [ 56.911397][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 56.916889][ T0] apic_timer_interrupt+0xf/0x20 [ 56.921817][ T0] kcsan_setup_watchpoint+0x1d4/0x460 [ 56.927178][ T0] __tsan_read8+0xc6/0x100 [ 56.931583][ T0] tcp_write_xmit+0xea/0x3120 [ 56.936287][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 56.941820][ T0] tcp_push+0x1e9/0x3d0 [ 56.945966][ T0] tcp_sendmsg_locked+0x1d2b/0x1fb0 [ 56.951294][ T0] tcp_sendmsg+0x39/0x60 [ 56.955709][ T0] inet_sendmsg+0x6d/0x90 [ 56.960030][ T0] sock_sendmsg+0x9f/0xc0 [ 56.964350][ T0] sock_write_iter+0x16b/0x210 [ 56.969172][ T0] new_sync_write+0x388/0x4a0 [ 56.973840][ T0] __vfs_write+0xb1/0xc0 [ 56.978072][ T0] vfs_write+0x18a/0x390 [ 56.982434][ T0] ksys_write+0xd5/0x1b0 [ 56.986664][ T0] __x64_sys_write+0x4c/0x60 [ 56.991244][ T0] do_syscall_64+0xcc/0x370 [ 56.995738][ T0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.001611][ T0] [ 57.003928][ T0] read to 0xffffffff85cb3ad0 of 4 bytes by task 0 on cpu 0: [ 57.011199][ T0] tick_nohz_next_event+0x19d/0x370 [ 57.016389][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 57.021921][ T0] do_idle+0x1a5/0x280 [ 57.026005][ T0] cpu_startup_entry+0x1b/0x20 [ 57.030756][ T0] rest_init+0xec/0xf6 [ 57.034817][ T0] arch_call_rest_init+0x17/0x37 [ 57.039753][ T0] start_kernel+0x838/0x85e [ 57.044279][ T0] x86_64_start_reservations+0x29/0x2b [ 57.049727][ T0] x86_64_start_kernel+0x72/0x76 [ 57.054653][ T0] secondary_startup_64+0xa4/0xb0 [ 57.059659][ T0] [ 57.061990][ T0] Reported by Kernel Concurrency Sanitizer on: [ 57.068167][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc7+ #0 [ 57.075355][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.085427][ T0] ================================================================== [ 57.093562][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 57.100341][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc7+ #0 [ 57.107454][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.117619][ T0] Call Trace: [ 57.120907][ T0] dump_stack+0x11d/0x181 [ 57.125414][ T0] panic+0x210/0x640 [ 57.129303][ T0] ? vprintk_func+0x8d/0x140 [ 57.133884][ T0] kcsan_report.cold+0xc/0xd [ 57.138775][ T0] kcsan_setup_watchpoint+0x3fe/0x460 [ 57.144354][ T0] __tsan_read4+0xc6/0x100 [ 57.148768][ T0] tick_nohz_next_event+0x19d/0x370 [ 57.153958][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 57.159525][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.166044][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.172274][ T0] ? debug_smp_processor_id+0x4c/0x172 [ 57.177725][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.183987][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.190219][ T0] do_idle+0x1a5/0x280 [ 57.194287][ T0] cpu_startup_entry+0x1b/0x20 [ 57.199043][ T0] rest_init+0xec/0xf6 [ 57.203144][ T0] ? trace_event_define_fields_vector_free_moved+0xb4/0xb4 [ 57.210380][ T0] arch_call_rest_init+0x17/0x37 [ 57.215356][ T0] start_kernel+0x838/0x85e [ 57.219986][ T0] x86_64_start_reservations+0x29/0x2b [ 57.225435][ T0] x86_64_start_kernel+0x72/0x76 [ 57.230409][ T0] secondary_startup_64+0xa4/0xb0 [ 57.237102][ T0] Kernel Offset: disabled [ 57.241830][ T0] Rebooting in 86400 seconds..