[ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. 2020/06/09 12:33:39 fuzzer started 2020/06/09 12:33:39 dialing manager at 10.128.0.105:35435 2020/06/09 12:33:39 syscalls: 3055 2020/06/09 12:33:39 code coverage: enabled 2020/06/09 12:33:39 comparison tracing: enabled 2020/06/09 12:33:39 extra coverage: enabled 2020/06/09 12:33:39 setuid sandbox: enabled 2020/06/09 12:33:39 namespace sandbox: enabled 2020/06/09 12:33:39 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/09 12:33:39 fault injection: enabled 2020/06/09 12:33:39 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/09 12:33:39 net packet injection: enabled 2020/06/09 12:33:39 net device setup: enabled 2020/06/09 12:33:39 concurrency sanitizer: enabled 2020/06/09 12:33:39 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/09 12:33:39 USB emulation: enabled syzkaller login: [ 52.866217][ T8935] KCSAN: could not find function: '_find_next_bit' 2020/06/09 12:33:41 adding functions to KCSAN blacklist: 'generic_write_end' 'add_timer' 'do_syslog' '__ext4_new_inode' '_find_next_bit' 'ep_poll' 'ktime_get_ts64' 'find_get_pages_range_tag' 'page_counter_charge' 'blk_mq_dispatch_rq_list' 'copy_process' [ 70.493390][ C0] ================================================================== [ 70.501539][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 70.509595][ C0] [ 70.511917][ C0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 70.519733][ C0] tick_sched_do_timer+0xb4/0xd0 [ 70.524760][ C0] tick_sched_timer+0x3f/0xd0 [ 70.529442][ C0] __hrtimer_run_queues+0x271/0x600 [ 70.534670][ C0] hrtimer_interrupt+0x226/0x490 [ 70.539608][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 70.545086][ C0] apic_timer_interrupt+0xf/0x20 [ 70.550317][ C0] __sanitizer_cov_trace_pc+0x9/0x50 [ 70.555609][ C0] tcp_v4_rcv+0xa5/0x1e10 [ 70.559916][ C0] ip_protocol_deliver_rcu+0x4b/0x410 [ 70.565277][ C0] ip_local_deliver_finish+0xf3/0x120 [ 70.570638][ C0] ip_local_deliver+0x135/0x220 [ 70.575530][ C0] ip_sublist_rcv_finish+0xf0/0x140 [ 70.580706][ C0] ip_sublist_rcv+0x3f8/0x530 [ 70.585364][ C0] ip_list_rcv+0x2f3/0x321 [ 70.589765][ C0] __netif_receive_skb_list_core+0x368/0x5c0 [ 70.595721][ C0] netif_receive_skb_list_internal+0x5c7/0x810 [ 70.601850][ C0] gro_normal_list.part.0+0x37/0xa0 [ 70.607041][ C0] napi_complete_done+0x1d3/0x3a0 [ 70.612075][ C0] virtqueue_napi_complete+0x36/0xa0 [ 70.617345][ C0] virtnet_poll+0x771/0x790 [ 70.621922][ C0] net_rx_action+0x3ad/0xac0 [ 70.626701][ C0] __do_softirq+0x118/0x34a [ 70.631189][ C0] run_ksoftirqd+0x41/0x60 [ 70.637599][ C0] smpboot_thread_fn+0x374/0x4a0 [ 70.642512][ C0] kthread+0x203/0x230 [ 70.646569][ C0] ret_from_fork+0x1f/0x30 [ 70.650960][ C0] [ 70.653269][ C0] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 70.660962][ C0] tick_sched_do_timer+0x2e/0xd0 [ 70.665881][ C0] tick_sched_timer+0x3f/0xd0 [ 70.670536][ C0] __hrtimer_run_queues+0x271/0x600 [ 70.675708][ C0] hrtimer_interrupt+0x226/0x490 [ 70.680636][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 70.686086][ C0] apic_timer_interrupt+0xf/0x20 [ 70.690989][ C0] [ 70.693291][ C0] Reported by Kernel Concurrency Sanitizer on: [ 70.699704][ C0] CPU: 0 PID: 8923 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 70.707938][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.718489][ C0] ================================================================== [ 70.726546][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 70.733903][ C0] CPU: 0 PID: 8923 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 70.742197][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.752238][ C0] Call Trace: [ 70.755503][ C0] [ 70.758346][ C0] dump_stack+0x11d/0x187 [ 70.762695][ C0] panic+0x210/0x640 [ 70.766570][ C0] ? vprintk_func+0x89/0x13a [ 70.771138][ C0] kcsan_report.cold+0xc/0x1a [ 70.775797][ C0] kcsan_setup_watchpoint+0x3fb/0x440 [ 70.781150][ C0] tick_sched_do_timer+0x2e/0xd0 [ 70.786152][ C0] tick_sched_timer+0x3f/0xd0 [ 70.790806][ C0] __hrtimer_run_queues+0x271/0x600 [ 70.795994][ C0] ? tick_sched_do_timer+0xd0/0xd0 [ 70.801107][ C0] hrtimer_interrupt+0x226/0x490 [ 70.806039][ C0] ? kvm_clock_read+0x14/0x30 [ 70.810705][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 70.816139][ C0] apic_timer_interrupt+0xf/0x20 [ 70.821045][ C0] [ 70.823956][ C0] RIP: 0033:0x469093 [ 70.827830][ C0] Code: 24 20 c3 cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14 4c 8b 54 24 18 4c 8b 44 24 20 44 8b 4c 24 28 b8 ca 00 00 00 0f 05 <89> 44 24 30 c3 cc cc cc cc cc cc cc cc 8b 7c 24 08 48 8b 74 24 10 [ 70.847425][ C0] RSP: 002b:000000c000049f38 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 70.855810][ C0] RAX: 0000000000000001 RBX: 000000c000049fd0 RCX: 0000000000469093 [ 70.863764][ C0] RDX: 0000000000000001 RSI: 0000000000000081 RDI: 00000000016828f8 [ 70.872003][ C0] RBP: 000000c000049f88 R08: 0000000000000000 R09: 0000000000000000 [ 70.879973][ C0] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 [ 70.887921][ C0] R13: 000000c000000f00 R14: 0000000000000020 R15: 0000000000000010 [ 70.897464][ C0] Kernel Offset: disabled [ 70.901794][ C0] Rebooting in 86400 seconds..