[....] 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. [ 55.402978][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 55.403003][ T26] audit: type=1800 audit(1580806811.422:29): pid=7856 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 [ 55.429367][ T26] audit: type=1800 audit(1580806811.422:30): pid=7856 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.220' (ECDSA) to the list of known hosts. 2020/02/04 09:00:22 fuzzer started 2020/02/04 09:00:25 dialing manager at 10.128.0.105:41149 2020/02/04 09:00:25 syscalls: 2904 2020/02/04 09:00:25 code coverage: enabled 2020/02/04 09:00:25 comparison tracing: enabled 2020/02/04 09:00:25 extra coverage: enabled 2020/02/04 09:00:25 setuid sandbox: enabled 2020/02/04 09:00:25 namespace sandbox: enabled 2020/02/04 09:00:25 Android sandbox: /sys/fs/selinux/policy does not exist 2020/02/04 09:00:25 fault injection: enabled 2020/02/04 09:00:25 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/02/04 09:00:25 net packet injection: enabled 2020/02/04 09:00:25 net device setup: enabled 2020/02/04 09:00:25 concurrency sanitizer: enabled 2020/02/04 09:00:25 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 70.689233][ C0] ================================================================== [ 70.697512][ C0] BUG: KCSAN: data-race in __hrtimer_run_queues / hrtimer_active [ 70.705913][ C0] [ 70.708251][ C0] read to 0xffff88812c01fbd8 of 8 bytes by interrupt on cpu 1: [ 70.715803][ C0] hrtimer_active+0x84/0x1a0 [ 70.720394][ C0] task_tick_fair+0x4c/0x910 [ 70.724976][ C0] scheduler_tick+0x5f/0xf0 [ 70.729746][ C0] update_process_times+0x5a/0x80 [ 70.734779][ C0] tick_sched_handle+0x75/0x100 [ 70.739638][ C0] tick_sched_timer+0x58/0xe0 [ 70.744329][ C0] __hrtimer_run_queues+0x274/0x5f0 [ 70.749526][ C0] hrtimer_interrupt+0x22a/0x480 [ 70.754466][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 70.759930][ C0] apic_timer_interrupt+0xf/0x20 [ 70.764863][ C0] kcsan_setup_watchpoint+0x1d4/0x460 [ 70.770240][ C0] __tsan_read1+0xc2/0x100 [ 70.774671][ C0] kallsyms_expand_symbol.constprop.0+0x70/0x160 [ 70.781028][ C0] kallsyms_lookup_name+0x7f/0x120 [ 70.786145][ C0] debugfs_write+0x14b/0x2d0 [ 70.790784][ C0] full_proxy_write+0xbd/0x100 [ 70.795641][ C0] __vfs_write+0x67/0xc0 [ 70.800090][ C0] vfs_write+0x18a/0x390 [ 70.804345][ C0] ksys_write+0xd5/0x1b0 [ 70.808592][ C0] __x64_sys_write+0x4c/0x60 [ 70.813197][ C0] do_syscall_64+0xcc/0x3a0 [ 70.817733][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 70.823614][ C0] [ 70.825940][ C0] write to 0xffff88812c01fbd8 of 8 bytes by interrupt on cpu 0: [ 70.833585][ C0] __hrtimer_run_queues+0x1e8/0x5f0 [ 70.838824][ C0] hrtimer_interrupt+0x22a/0x480 [ 70.843780][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 70.849681][ C0] apic_timer_interrupt+0xf/0x20 [ 70.854664][ C0] native_safe_halt+0xe/0x10 [ 70.859263][ C0] arch_cpu_idle+0xa/0x10 [ 70.863587][ C0] default_idle_call+0x1e/0x40 [ 70.868352][ C0] do_idle+0x1c2/0x290 [ 70.872429][ C0] cpu_startup_entry+0x1b/0x20 [ 70.877206][ C0] rest_init+0xec/0xf6 [ 70.881289][ C0] arch_call_rest_init+0x17/0x37 [ 70.886231][ C0] start_kernel+0x838/0x85e [ 70.890757][ C0] x86_64_start_reservations+0x29/0x2b [ 70.896222][ C0] x86_64_start_kernel+0x72/0x76 [ 70.901311][ C0] secondary_startup_64+0xa4/0xb0 [ 70.906343][ C0] [ 70.908667][ C0] Reported by Kernel Concurrency Sanitizer on: [ 70.914846][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc1-syzkaller #0 [ 70.922829][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.933005][ C0] ================================================================== [ 70.941165][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 70.947758][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc1-syzkaller #0 [ 70.955758][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.965822][ C0] Call Trace: [ 70.969103][ C0] [ 70.972057][ C0] dump_stack+0x11d/0x181 [ 70.976401][ C0] panic+0x210/0x640 [ 70.980396][ C0] ? vprintk_func+0x8d/0x140 [ 70.985113][ C0] kcsan_report.cold+0xc/0xd [ 70.989720][ C0] kcsan_setup_watchpoint+0x3fe/0x460 [ 70.995108][ C0] __tsan_unaligned_write8+0xc7/0x110 [ 71.000505][ C0] __hrtimer_run_queues+0x1e8/0x5f0 [ 71.005865][ C0] ? ktime_get_update_offsets_now+0x28f/0x2f0 [ 71.012377][ C0] hrtimer_interrupt+0x22a/0x480 [ 71.017330][ C0] ? sched_clock+0x13/0x20 [ 71.021775][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 71.027256][ C0] apic_timer_interrupt+0xf/0x20 [ 71.032188][ C0] [ 71.035130][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 71.040511][ C0] Code: cc cc cc cc cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 4c e6 59 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 3c e6 59 00 fb f4 cc 55 48 89 e5 41 55 41 54 53 e8 d2 57 91 fc e8 fd da ab fd 0f [ 71.060306][ C0] RSP: 0018:ffffffff85c03df8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 71.069162][ C0] RAX: 0000000000000000 RBX: ffffffff85c2b780 RCX: ffffffff82546c55 [ 71.077136][ C0] RDX: 0000000000000000 RSI: ffffffff82546c5e RDI: 0000000000000005 [ 71.085126][ C0] RBP: ffffffff85c03e18 R08: ffffffff85c2b780 R09: 0000ffff85a2d160 [ 71.093120][ C0] R10: 0000ffff85c03e08 R11: 0000ffff85a2d167 R12: 0000000000000000 [ 71.101094][ C0] R13: ffffffff85c2b780 R14: 0000000000000000 R15: 0000000000000000 [ 71.109219][ C0] ? debug_smp_processor_id+0x35/0x137 [ 71.114780][ C0] ? debug_smp_processor_id+0x3e/0x137 [ 71.120428][ C0] ? default_idle+0x26/0x180 [ 71.125020][ C0] arch_cpu_idle+0xa/0x10 [ 71.129365][ C0] default_idle_call+0x1e/0x40 [ 71.134131][ C0] do_idle+0x1c2/0x290 [ 71.138223][ C0] ? debug_smp_processor_id+0x43/0x137 [ 71.143704][ C0] cpu_startup_entry+0x1b/0x20 [ 71.148584][ C0] rest_init+0xec/0xf6 [ 71.152661][ C0] ? trace_event_define_fields_vector_free_moved+0xb4/0xb4 [ 71.159873][ C0] arch_call_rest_init+0x17/0x37 [ 71.164819][ C0] start_kernel+0x838/0x85e [ 71.169352][ C0] x86_64_start_reservations+0x29/0x2b [ 71.174831][ C0] x86_64_start_kernel+0x72/0x76 [ 71.179785][ C0] secondary_startup_64+0xa4/0xb0 [ 71.259685][ C0] Kernel Offset: disabled [ 71.264130][ C0] Rebooting in 86400 seconds..