[ 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 '10.128.10.2' (ECDSA) to the list of known hosts. 2020/06/09 03:55:16 fuzzer started 2020/06/09 03:55:16 dialing manager at 10.128.0.105:32965 2020/06/09 03:55:16 syscalls: 3055 2020/06/09 03:55:16 code coverage: enabled 2020/06/09 03:55:16 comparison tracing: enabled 2020/06/09 03:55:16 extra coverage: enabled 2020/06/09 03:55:16 setuid sandbox: enabled 2020/06/09 03:55:16 namespace sandbox: enabled 2020/06/09 03:55:16 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/09 03:55:16 fault injection: enabled 2020/06/09 03:55:16 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/09 03:55:16 net packet injection: enabled 2020/06/09 03:55:16 net device setup: enabled 2020/06/09 03:55:16 concurrency sanitizer: enabled 2020/06/09 03:55:16 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/09 03:55:16 USB emulation: enabled syzkaller login: [ 50.452992][ T8914] KCSAN: could not find function: '_find_next_bit' 2020/06/09 03:55:20 adding functions to KCSAN blacklist: 'generic_write_end' '__ext4_new_inode' 'echo_char' 'do_syslog' 'n_tty_receive_buf_common' 'find_get_pages_range_tag' 'mod_timer' 'generic_fillattr' 'exit_signals' 'wbt_done' 'run_timer_softirq' 'copy_process' 'blk_mq_sched_dispatch_requests' 'dd_has_work' 'do_exit' 'tick_nohz_next_event' 'blk_mq_dispatch_rq_list' '_find_next_bit' 'xas_find_marked' 'tick_nohz_idle_stop_tick' 'alloc_pid' 'ext4_mark_iloc_dirty' 'complete_signal' 'ep_poll' 'pcpu_alloc' '__mark_inode_dirty' 'iput' 'atime_needs_update' 'file_update_time' 'ext4_free_inodes_count' 'blk_mq_get_request' 'ktime_get_real_seconds' 'futex_wait_queue_me' 'page_counter_charge' 'do_nanosleep' 'do_signal_stop' 'ext4_setattr' 'kauditd_thread' [ 77.299836][ C1] ================================================================== [ 77.307992][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 77.316059][ C1] [ 77.318473][ C1] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 77.326114][ C1] tick_sched_do_timer+0xb4/0xd0 [ 77.331049][ C1] tick_sched_timer+0x3f/0xd0 [ 77.335785][ C1] __hrtimer_run_queues+0x271/0x600 [ 77.341201][ C1] hrtimer_interrupt+0x226/0x490 [ 77.346267][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 77.351705][ C1] apic_timer_interrupt+0xf/0x20 [ 77.356619][ C1] __sanitizer_cov_trace_pc+0x47/0x50 [ 77.361998][ C1] nf_hook_slow_list+0x197/0x29f [ 77.366917][ C1] ip_sublist_rcv+0x4f9/0x530 [ 77.371567][ C1] ip_list_rcv+0x2f3/0x321 [ 77.375981][ C1] __netif_receive_skb_list_core+0x368/0x5c0 [ 77.381956][ C1] netif_receive_skb_list_internal+0x5c7/0x810 [ 77.388093][ C1] gro_normal_list.part.0+0x37/0xa0 [ 77.393264][ C1] gro_normal_one+0x14c/0x160 [ 77.397928][ C1] napi_gro_receive+0x27d/0x2f0 [ 77.402761][ C1] receive_buf+0x24c/0x3420 [ 77.407256][ C1] virtnet_poll+0x343/0x790 [ 77.411834][ C1] net_rx_action+0x3ad/0xac0 [ 77.416413][ C1] __do_softirq+0x118/0x34a [ 77.421004][ C1] run_ksoftirqd+0x41/0x60 [ 77.425677][ C1] smpboot_thread_fn+0x374/0x4a0 [ 77.430605][ C1] kthread+0x203/0x230 [ 77.434652][ C1] ret_from_fork+0x1f/0x30 [ 77.439036][ C1] [ 77.441393][ C1] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 77.449111][ C1] tick_sched_do_timer+0x2e/0xd0 [ 77.454037][ C1] tick_sched_timer+0x3f/0xd0 [ 77.458686][ C1] __hrtimer_run_queues+0x271/0x600 [ 77.463858][ C1] hrtimer_interrupt+0x226/0x490 [ 77.468804][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 77.474235][ C1] apic_timer_interrupt+0xf/0x20 [ 77.479138][ C1] [ 77.481437][ C1] Reported by Kernel Concurrency Sanitizer on: [ 77.487571][ C1] CPU: 1 PID: 8915 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 77.495967][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.506027][ C1] ================================================================== [ 77.514084][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 77.520647][ C1] CPU: 1 PID: 8915 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 77.528853][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.538964][ C1] Call Trace: [ 77.542320][ C1] [ 77.545167][ C1] dump_stack+0x11d/0x187 [ 77.549489][ C1] panic+0x210/0x640 [ 77.553361][ C1] ? vprintk_func+0x89/0x13a [ 77.557927][ C1] kcsan_report.cold+0xc/0x1a [ 77.562585][ C1] kcsan_setup_watchpoint+0x3fb/0x440 [ 77.568035][ C1] tick_sched_do_timer+0x2e/0xd0 [ 77.572950][ C1] tick_sched_timer+0x3f/0xd0 [ 77.577623][ C1] __hrtimer_run_queues+0x271/0x600 [ 77.582817][ C1] ? tick_sched_do_timer+0xd0/0xd0 [ 77.587916][ C1] hrtimer_interrupt+0x226/0x490 [ 77.592851][ C1] ? kvm_clock_read+0x14/0x30 [ 77.597526][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 77.603056][ C1] apic_timer_interrupt+0xf/0x20 [ 77.608073][ C1] [ 77.611334][ C1] RIP: 0033:0x66286f [ 77.615209][ C1] Code: ec 48 48 89 6c 24 40 48 8d 6c 24 40 48 8b 5c 24 50 48 8b 43 18 48 89 44 24 28 48 8b 74 24 60 48 8d 0c 30 48 8b 73 08 48 39 f1 <48> 0f 4f ce 48 89 4c 24 20 48 8b 7c 24 58 49 89 c0 48 29 f8 48 8b [ 77.634799][ C1] RSP: 002b:000000c0001dda98 EFLAGS: 00000283 ORIG_RAX: ffffffffffffff13 [ 77.643319][ C1] RAX: 0000000000006808 RBX: 000000c00017b088 RCX: 000000000000680e [ 77.651279][ C1] RDX: 0000000000000006 RSI: 0000000000008000 RDI: 0000000000000009 [ 77.659671][ C1] RBP: 000000c0001ddad8 R08: 0000000000000006 R09: 0000000000008000 [ 77.668123][ C1] R10: 000000000000000e R11: 000000000000128e R12: ffffffffffffffff [ 77.676718][ C1] R13: 0000000000002000 R14: 0000000000000002 R15: 0000000000000002 [ 77.685795][ C1] Kernel Offset: disabled [ 77.690587][ C1] Rebooting in 86400 seconds..