[ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.160' (ECDSA) to the list of known hosts. 2020/06/02 13:47:27 fuzzer started 2020/06/02 13:47:27 dialing manager at 10.128.0.105:37135 2020/06/02 13:47:33 syscalls: 3055 2020/06/02 13:47:33 code coverage: enabled 2020/06/02 13:47:33 comparison tracing: enabled 2020/06/02 13:47:33 extra coverage: enabled 2020/06/02 13:47:33 setuid sandbox: enabled 2020/06/02 13:47:33 namespace sandbox: enabled 2020/06/02 13:47:33 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/02 13:47:33 fault injection: enabled 2020/06/02 13:47:33 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/02 13:47:33 net packet injection: enabled 2020/06/02 13:47:33 net device setup: enabled 2020/06/02 13:47:33 concurrency sanitizer: enabled 2020/06/02 13:47:33 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/02 13:47:33 USB emulation: enabled syzkaller login: [ 59.046587][ T8919] KCSAN: could not find function: '_find_next_bit' 2020/06/02 13:47:36 adding functions to KCSAN blacklist: '_find_next_bit' 'mod_timer' 'generic_write_end' 'do_nanosleep' 'run_timer_softirq' 'generic_fillattr' 'do_syslog' '__send_signal' 'tick_nohz_idle_stop_tick' 'page_counter_charge' 'ext4_free_inodes_count' 'copy_process' 'find_get_pages_range_tag' 'xas_clear_mark' 'futex_wait_queue_me' 'shmem_getpage_gfp' 'ep_poll' '__ext4_new_inode' 'n_tty_receive_buf_common' 'ktime_get_real_seconds' 'tick_nohz_next_event' 'dd_has_work' 'shmem_file_read_iter' [ 62.943591][ C0] ================================================================== [ 62.951734][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 62.959763][ C0] [ 62.962069][ C0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 62.969670][ C0] tick_sched_do_timer+0xb4/0xd0 [ 62.974626][ C0] tick_sched_timer+0x3f/0xd0 [ 62.979275][ C0] __hrtimer_run_queues+0x271/0x600 [ 62.984468][ C0] hrtimer_interrupt+0x226/0x490 [ 62.989384][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 62.994838][ C0] apic_timer_interrupt+0xf/0x20 [ 62.999741][ C0] [ 63.002063][ C0] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 63.009579][ C0] tick_sched_do_timer+0x2e/0xd0 [ 63.014500][ C0] tick_sched_timer+0x3f/0xd0 [ 63.019147][ C0] __hrtimer_run_queues+0x271/0x600 [ 63.024324][ C0] hrtimer_interrupt+0x226/0x490 [ 63.029235][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 63.034672][ C0] apic_timer_interrupt+0xf/0x20 [ 63.039584][ C0] __tsan_read8+0x17/0x110 [ 63.043983][ C0] ipt_do_table+0x25b/0xe70 [ 63.048467][ C0] iptable_mangle_hook+0x75/0x270 [ 63.053475][ C0] nf_hook_slow+0x7c/0x160 [ 63.057863][ C0] ip_local_deliver+0x1f2/0x220 [ 63.062705][ C0] ip_sublist_rcv_finish+0xf0/0x140 [ 63.067874][ C0] ip_sublist_rcv+0x3f8/0x530 [ 63.072534][ C0] ip_list_rcv+0x2f3/0x321 [ 63.076934][ C0] __netif_receive_skb_list_core+0x368/0x5c0 [ 63.082888][ C0] netif_receive_skb_list_internal+0x5c7/0x810 [ 63.089014][ C0] gro_normal_list.part.0+0x37/0xa0 [ 63.094183][ C0] gro_normal_one+0x14c/0x160 [ 63.098832][ C0] napi_gro_receive+0x27d/0x2f0 [ 63.103666][ C0] receive_buf+0x24c/0x3420 [ 63.108151][ C0] virtnet_poll+0x343/0x790 [ 63.112636][ C0] net_rx_action+0x3ad/0xac0 [ 63.117209][ C0] __do_softirq+0x118/0x34a [ 63.121682][ C0] run_ksoftirqd+0x41/0x60 [ 63.126115][ C0] smpboot_thread_fn+0x374/0x4a0 [ 63.131034][ C0] kthread+0x203/0x230 [ 63.135074][ C0] ret_from_fork+0x1f/0x30 [ 63.139454][ C0] [ 63.141764][ C0] Reported by Kernel Concurrency Sanitizer on: [ 63.147888][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 63.155918][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.166041][ C0] ================================================================== [ 63.174083][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 63.180641][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 63.188671][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.198694][ C0] Call Trace: [ 63.201953][ C0] [ 63.204784][ C0] dump_stack+0x11d/0x187 [ 63.209087][ C0] panic+0x210/0x640 [ 63.212957][ C0] ? vprintk_func+0x89/0x13a [ 63.217522][ C0] kcsan_report.cold+0xc/0x1a [ 63.222264][ C0] kcsan_setup_watchpoint+0x3fb/0x440 [ 63.227612][ C0] tick_sched_do_timer+0x2e/0xd0 [ 63.232558][ C0] tick_sched_timer+0x3f/0xd0 [ 63.237208][ C0] __hrtimer_run_queues+0x271/0x600 [ 63.242381][ C0] ? tick_sched_do_timer+0xd0/0xd0 [ 63.247465][ C0] hrtimer_interrupt+0x226/0x490 [ 63.252377][ C0] ? kvm_clock_read+0x14/0x30 [ 63.257036][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 63.262467][ C0] apic_timer_interrupt+0xf/0x20 [ 63.267376][ C0] [ 63.270289][ C0] RIP: 0010:__tsan_read8+0x17/0x110 [ 63.275472][ C0] Code: 00 00 e9 9c f1 ff ff e9 07 f8 ff ff 0f 1f 80 00 00 00 00 48 ba ff ff ff ff ff ff 00 00 48 89 f8 49 89 f9 48 c1 e8 09 49 21 d1 <4d> 8d 59 07 25 f8 01 00 00 48 8d 88 40 03 af 88 48 05 58 03 af 88 [ 63.295060][ C0] RSP: 0018:ffffc90000cb35e0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 63.303520][ C0] RAX: 007fffc440937ba4 RBX: ffff888126f748a0 RCX: ffffffff88af0450 [ 63.311471][ C0] RDX: 0000ffffffffffff RSI: ffffffff8285fdfa RDI: ffff888126f748a0 [ 63.319414][ C0] RBP: ffffc90000cb37f0 R08: 0000000000000000 R09: 0000888126f748a0 [ 63.327359][ C0] R10: 0000c90000cb36f8 R11: 00008881268df43f R12: ffff888121f27000 [ 63.335311][ C0] R13: ffff888218198180 R14: ffff8881268df400 R15: ffff888121f27000 [ 63.343274][ C0] ? debug_smp_processor_id+0x3a/0x129 [ 63.348718][ C0] ipt_do_table+0x25b/0xe70 [ 63.353193][ C0] ? sock_put+0x64/0xb0 [ 63.357328][ C0] ? tcp_v4_rcv+0x12c/0x1e10 [ 63.361897][ C0] iptable_mangle_hook+0x75/0x270 [ 63.366897][ C0] ? __rcu_read_unlock+0x77/0x390 [ 63.371896][ C0] ? iptable_mangle_net_exit+0x90/0x90 [ 63.377327][ C0] nf_hook_slow+0x7c/0x160 [ 63.381729][ C0] ip_local_deliver+0x1f2/0x220 [ 63.386553][ C0] ? ip_protocol_deliver_rcu+0x410/0x410 [ 63.392158][ C0] ip_sublist_rcv_finish+0xf0/0x140 [ 63.397337][ C0] ip_sublist_rcv+0x3f8/0x530 [ 63.401990][ C0] ? ip_sublist_rcv+0x530/0x530 [ 63.406815][ C0] ip_list_rcv+0x2f3/0x321 [ 63.411207][ C0] ? ip_rcv+0x1b0/0x1b0 [ 63.415341][ C0] __netif_receive_skb_list_core+0x368/0x5c0 [ 63.421309][ C0] ? ktime_get_with_offset+0x1e6/0x230 [ 63.426744][ C0] netif_receive_skb_list_internal+0x5c7/0x810 [ 63.432883][ C0] gro_normal_list.part.0+0x37/0xa0 [ 63.438053][ C0] ? __write_once_size+0x7c/0x100 [ 63.443059][ C0] gro_normal_one+0x14c/0x160 [ 63.447721][ C0] napi_gro_receive+0x27d/0x2f0 [ 63.452559][ C0] receive_buf+0x24c/0x3420 [ 63.457051][ C0] ? virtqueue_get_buf_ctx+0x4db/0x5c0 [ 63.462483][ C0] virtnet_poll+0x343/0x790 [ 63.466976][ C0] net_rx_action+0x3ad/0xac0 [ 63.471542][ C0] __do_softirq+0x118/0x34a [ 63.476031][ C0] ? takeover_tasklets+0x240/0x240 [ 63.481125][ C0] run_ksoftirqd+0x41/0x60 [ 63.485698][ C0] smpboot_thread_fn+0x374/0x4a0 [ 63.490620][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 63.496578][ C0] kthread+0x203/0x230 [ 63.500617][ C0] ? kthread_unpark+0xd0/0xd0 [ 63.505369][ C0] ret_from_fork+0x1f/0x30 [ 63.511128][ C0] Kernel Offset: disabled [ 63.515447][ C0] Rebooting in 86400 seconds..