[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 50.657338][ T7949] sshd (7949) used greatest stack depth: 10136 bytes left
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 50.938132][ T26] kauditd_printk_skb: 7 callbacks suppressed
[ 50.938150][ T26] audit: type=1800 audit(1580819693.455:29): pid=7884 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
[ 50.964555][ T26] audit: type=1800 audit(1580819693.465:30): pid=7884 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 '10.128.0.245' (ECDSA) to the list of known hosts.
2020/02/04 12:35:03 fuzzer started
2020/02/04 12:35:05 dialing manager at 10.128.0.105:41149
2020/02/04 12:35:06 syscalls: 2904
2020/02/04 12:35:06 code coverage: enabled
2020/02/04 12:35:06 comparison tracing: enabled
2020/02/04 12:35:06 extra coverage: enabled
2020/02/04 12:35:06 setuid sandbox: enabled
2020/02/04 12:35:06 namespace sandbox: enabled
2020/02/04 12:35:06 Android sandbox: /sys/fs/selinux/policy does not exist
2020/02/04 12:35:06 fault injection: enabled
2020/02/04 12:35:06 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/02/04 12:35:06 net packet injection: enabled
2020/02/04 12:35:06 net device setup: enabled
2020/02/04 12:35:06 concurrency sanitizer: enabled
2020/02/04 12:35:06 devlink PCI setup: PCI device 0000:00:10.0 is not available
syzkaller login: [ 67.918692][ C0] ==================================================================
[ 67.926848][ C0] BUG: KCSAN: data-race in __hrtimer_run_queues / hrtimer_active
[ 67.934563][ C0]
[ 67.936902][ C0] read to 0xffff88812c01fbd8 of 8 bytes by interrupt on cpu 1:
[ 67.944527][ C0] hrtimer_active+0x84/0x1a0
[ 67.949130][ C0] task_tick_fair+0x4c/0x910
[ 67.953713][ C0] scheduler_tick+0x5f/0xf0
[ 67.958226][ C0] update_process_times+0x5a/0x80
[ 67.963251][ C0] tick_sched_handle+0x75/0x100
[ 67.968110][ C0] tick_sched_timer+0x58/0xe0
[ 67.972789][ C0] __hrtimer_run_queues+0x274/0x5f0
[ 67.977999][ C0] hrtimer_interrupt+0x22a/0x480
[ 67.982943][ C0] smp_apic_timer_interrupt+0xdc/0x280
[ 67.988422][ C0] apic_timer_interrupt+0xf/0x20
[ 67.993374][ C0] kcsan_setup_watchpoint+0x1d4/0x460
[ 67.998750][ C0] __tsan_read1+0xc2/0x100
[ 68.003183][ C0] kallsyms_expand_symbol.constprop.0+0x70/0x160
[ 68.009518][ C0] kallsyms_lookup_name+0x7f/0x120
[ 68.014634][ C0] debugfs_write+0x14b/0x2d0
[ 68.019227][ C0] full_proxy_write+0xbd/0x100
[ 68.023984][ C0] __vfs_write+0x67/0xc0
[ 68.028337][ C0] vfs_write+0x18a/0x390
[ 68.032584][ C0] ksys_write+0xd5/0x1b0
[ 68.036829][ C0] __x64_sys_write+0x4c/0x60
[ 68.041437][ C0] do_syscall_64+0xcc/0x3a0
[ 68.046061][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 68.051955][ C0]
[ 68.054293][ C0] write to 0xffff88812c01fbd8 of 8 bytes by interrupt on cpu 0:
[ 68.061933][ C0] __hrtimer_run_queues+0x1e8/0x5f0
[ 68.067146][ C0] hrtimer_interrupt+0x22a/0x480
[ 68.072092][ C0] smp_apic_timer_interrupt+0xdc/0x280
[ 68.077542][ C0] apic_timer_interrupt+0xf/0x20
[ 68.082600][ C0] native_safe_halt+0xe/0x10
[ 68.087306][ C0] arch_cpu_idle+0xa/0x10
[ 68.091640][ C0] default_idle_call+0x1e/0x40
[ 68.096407][ C0] do_idle+0x1c2/0x290
[ 68.100480][ C0] cpu_startup_entry+0x1b/0x20
[ 68.105234][ C0] rest_init+0xec/0xf6
[ 68.109309][ C0] arch_call_rest_init+0x17/0x37
[ 68.114245][ C0] start_kernel+0x838/0x85e
[ 68.118747][ C0] x86_64_start_reservations+0x29/0x2b
[ 68.124210][ C0] x86_64_start_kernel+0x72/0x76
[ 68.129151][ C0] secondary_startup_64+0xa4/0xb0
[ 68.135029][ C0]
[ 68.137347][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 68.143509][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc1-syzkaller #0
[ 68.151493][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 68.161541][ C0] ==================================================================
[ 68.169598][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 68.176194][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc1-syzkaller #0
[ 68.184074][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 68.194128][ C0] Call Trace:
[ 68.197407][ C0]
[ 68.200268][ C0] dump_stack+0x11d/0x181
[ 68.204602][ C0] panic+0x210/0x640
[ 68.208516][ C0] ? vprintk_func+0x8d/0x140
[ 68.213122][ C0] kcsan_report.cold+0xc/0xd
[ 68.217724][ C0] kcsan_setup_watchpoint+0x3fe/0x460
[ 68.223093][ C0] __tsan_unaligned_write8+0xc7/0x110
[ 68.228475][ C0] __hrtimer_run_queues+0x1e8/0x5f0
[ 68.233668][ C0] ? ktime_get_update_offsets_now+0x28f/0x2f0
[ 68.239740][ C0] hrtimer_interrupt+0x22a/0x480
[ 68.244686][ C0] ? sched_clock+0x13/0x20
[ 68.249107][ C0] smp_apic_timer_interrupt+0xdc/0x280
[ 68.254621][ C0] apic_timer_interrupt+0xf/0x20
[ 68.259546][ C0]
[ 68.262498][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 68.267896][ 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
[ 68.287514][ C0] RSP: 0018:ffffffff85c03df8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
[ 68.295931][ C0] RAX: 0000000000000000 RBX: ffffffff85c2b780 RCX: ffffffff82546c55
[ 68.303904][ C0] RDX: 0000000000000000 RSI: ffffffff82546c5e RDI: 0000000000000005
[ 68.311916][ C0] RBP: ffffffff85c03e18 R08: ffffffff85c2b780 R09: 0000ffff85a2d160
[ 68.320016][ C0] R10: 0000ffff85c03e08 R11: 0000ffff85a2d167 R12: 0000000000000000
[ 68.327991][ C0] R13: ffffffff85c2b780 R14: 0000000000000000 R15: 0000000000000000
[ 68.335993][ C0] ? debug_smp_processor_id+0x35/0x137
[ 68.341589][ C0] ? debug_smp_processor_id+0x3e/0x137
[ 68.347178][ C0] ? default_idle+0x26/0x180
[ 68.351787][ C0] arch_cpu_idle+0xa/0x10
[ 68.356142][ C0] default_idle_call+0x1e/0x40
[ 68.360913][ C0] do_idle+0x1c2/0x290
[ 68.365003][ C0] ? debug_smp_processor_id+0x43/0x137
[ 68.370479][ C0] cpu_startup_entry+0x1b/0x20
[ 68.375251][ C0] rest_init+0xec/0xf6
[ 68.379340][ C0] ? trace_event_define_fields_vector_free_moved+0xb4/0xb4
[ 68.386544][ C0] arch_call_rest_init+0x17/0x37
[ 68.391483][ C0] start_kernel+0x838/0x85e
[ 68.395997][ C0] x86_64_start_reservations+0x29/0x2b
[ 68.401458][ C0] x86_64_start_kernel+0x72/0x76
[ 68.406407][ C0] secondary_startup_64+0xa4/0xb0
[ 68.467972][ C0] Kernel Offset: disabled
[ 68.472431][ C0] Rebooting in 86400 seconds..