[info] Using makefile-style concurrent boot in runlevel 2. [ 69.836122][ T26] audit: type=1800 audit(1579715822.763:21): pid=7748 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 69.893141][ T26] audit: type=1800 audit(1579715822.773:22): pid=7748 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 '10.128.0.119' (ECDSA) to the list of known hosts. 2020/01/22 17:57:15 fuzzer started 2020/01/22 17:57:17 dialing manager at 10.128.0.105:37633 2020/01/22 17:57:17 syscalls: 2861 2020/01/22 17:57:17 code coverage: enabled 2020/01/22 17:57:17 comparison tracing: enabled 2020/01/22 17:57:17 extra coverage: enabled 2020/01/22 17:57:17 setuid sandbox: enabled 2020/01/22 17:57:17 namespace sandbox: enabled 2020/01/22 17:57:17 Android sandbox: /sys/fs/selinux/policy does not exist 2020/01/22 17:57:17 fault injection: enabled 2020/01/22 17:57:17 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/01/22 17:57:17 net packet injection: enabled 2020/01/22 17:57:17 net device setup: enabled 2020/01/22 17:57:17 concurrency sanitizer: enabled 2020/01/22 17:57:17 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/01/22 17:57:19 adding functions to KCSAN blacklist: '__hrtimer_run_queues' 'taskstats_exit' 'ep_poll' 'find_next_bit' 'add_timer' 'blk_mq_dispatch_rq_list' 'find_get_pages_range_tag' 'generic_write_end' 'tick_do_update_jiffies64' 'tomoyo_supervisor' 'blk_mq_sched_dispatch_requests' 'page_counter_charge' 'mm_update_next_owner' syzkaller login: [ 91.738240][ T0] ================================================================== [ 91.746746][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 91.755009][ T0] [ 91.757425][ T0] write to 0xffffffff85ebb050 of 4 bytes by interrupt on cpu 0: [ 91.765226][ T0] tick_sched_do_timer+0xc0/0xe0 [ 91.770257][ T0] tick_sched_timer+0x43/0xe0 [ 91.775136][ T0] __hrtimer_run_queues+0x274/0x5f0 [ 91.780476][ T0] hrtimer_interrupt+0x22a/0x480 [ 91.785412][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 91.791325][ T0] apic_timer_interrupt+0xf/0x20 [ 91.796499][ T0] kmalloc_slab+0x3f/0x60 [ 91.801042][ T0] __kmalloc_reserve.isra.0+0x49/0xd0 [ 91.806525][ T0] __alloc_skb+0xc2/0x360 [ 91.810966][ T0] __tcp_send_ack+0x7e/0x300 [ 91.815623][ T0] tcp_send_ack+0x34/0x40 [ 91.820160][ T0] tcp_cleanup_rbuf+0x130/0x360 [ 91.825403][ T0] tcp_recvmsg+0x687/0x1c90 [ 91.830298][ T0] inet_recvmsg+0xbb/0x250 [ 91.835500][ T0] sock_recvmsg+0x92/0xb0 [ 91.839830][ T0] sock_read_iter+0x15f/0x1e0 [ 91.844814][ T0] new_sync_read+0x4b1/0x4f0 [ 91.849960][ T0] __vfs_read+0xb1/0xc0 [ 91.854207][ T0] vfs_read+0x143/0x2c0 [ 91.858370][ T0] ksys_read+0x17b/0x1b0 [ 91.862703][ T0] __x64_sys_read+0x4c/0x60 [ 91.867486][ T0] do_syscall_64+0xcc/0x3a0 [ 91.872111][ T0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 91.877994][ T0] [ 91.880593][ T0] read to 0xffffffff85ebb050 of 4 bytes by task 0 on cpu 1: [ 91.888027][ T0] tick_nohz_next_event+0x19d/0x370 [ 91.893595][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 91.899489][ T0] do_idle+0x1b8/0x290 [ 91.903561][ T0] cpu_startup_entry+0x1b/0x20 [ 91.908613][ T0] start_secondary+0x168/0x1b0 [ 91.913466][ T0] secondary_startup_64+0xa4/0xb0 [ 91.918593][ T0] [ 91.921014][ T0] Reported by Kernel Concurrency Sanitizer on: [ 91.927391][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-rc1-syzkaller #0 [ 91.935284][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 91.945424][ T0] ================================================================== [ 91.953745][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 91.960664][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-rc1-syzkaller #0 [ 91.968831][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 91.979482][ T0] Call Trace: [ 91.982903][ T0] dump_stack+0x11d/0x181 [ 91.987390][ T0] panic+0x210/0x640 [ 91.991408][ T0] ? vprintk_func+0x8d/0x140 [ 91.996401][ T0] kcsan_report.cold+0xc/0xd [ 92.001274][ T0] kcsan_setup_watchpoint+0x3fe/0x460 [ 92.006933][ T0] __tsan_read4+0xc6/0x100 [ 92.011355][ T0] tick_nohz_next_event+0x19d/0x370 [ 92.017027][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 92.022947][ T0] ? debug_smp_processor_id+0x43/0x137 [ 92.028911][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.035153][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.041400][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.047937][ T0] do_idle+0x1b8/0x290 [ 92.052000][ T0] cpu_startup_entry+0x1b/0x20 [ 92.056977][ T0] start_secondary+0x168/0x1b0 [ 92.062021][ T0] secondary_startup_64+0xa4/0xb0 [ 92.069038][ T0] Kernel Offset: disabled [ 92.073593][ T0] Rebooting in 86400 seconds..