[ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ 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 '10.128.1.42' (ECDSA) to the list of known hosts. 2020/06/03 01:08:30 fuzzer started 2020/06/03 01:08:30 dialing manager at 10.128.0.105:34577 2020/06/03 01:08:30 syscalls: 3055 2020/06/03 01:08:30 code coverage: enabled 2020/06/03 01:08:30 comparison tracing: enabled 2020/06/03 01:08:30 extra coverage: enabled 2020/06/03 01:08:30 setuid sandbox: enabled 2020/06/03 01:08:30 namespace sandbox: enabled 2020/06/03 01:08:30 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/03 01:08:30 fault injection: enabled 2020/06/03 01:08:30 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/03 01:08:30 net packet injection: enabled 2020/06/03 01:08:30 net device setup: enabled 2020/06/03 01:08:30 concurrency sanitizer: enabled 2020/06/03 01:08:30 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/03 01:08:30 USB emulation: enabled syzkaller login: [ 52.414870][ T8935] KCSAN: could not find function: '_find_next_bit' 2020/06/03 01:08:33 adding functions to KCSAN blacklist: 'run_timer_softirq' 'ep_poll' 'atime_needs_update' 'complete_signal' 'vm_area_dup' 'generic_fillattr' 'ext4_mb_good_group' '_find_next_bit' 'find_get_pages_range_tag' '__mark_inode_dirty' 'kcm_rfree' 'file_update_time' 'copy_process' 'kauditd_thread' 'blk_mq_get_request' 'xas_clear_mark' 'generic_write_end' 'do_nanosleep' '__ext4_new_inode' 'page_counter_charge' 'ext4_free_inodes_count' [ 55.574376][ T0] ================================================================== [ 55.582524][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 55.590658][ T0] [ 55.592986][ T0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 55.600626][ T0] tick_sched_do_timer+0xb4/0xd0 [ 55.605569][ T0] tick_sched_timer+0x3f/0xd0 [ 55.610246][ T0] __hrtimer_run_queues+0x271/0x600 [ 55.615449][ T0] hrtimer_interrupt+0x226/0x490 [ 55.620388][ T0] smp_apic_timer_interrupt+0xd8/0x270 [ 55.625843][ T0] apic_timer_interrupt+0xf/0x20 [ 55.630803][ T0] kcsan_setup_watchpoint+0x25a/0x440 [ 55.636183][ T0] copyout+0x3a/0xb0 [ 55.640075][ T0] _copy_to_iter+0x174/0x990 [ 55.644665][ T0] simple_copy_to_iter+0x56/0x80 [ 55.649603][ T0] __skb_datagram_iter+0x23f/0x470 [ 55.654799][ T0] skb_copy_datagram_iter+0x65/0x160 [ 55.660084][ T0] tcp_recvmsg+0x109e/0x1ba0 [ 55.664676][ T0] inet_recvmsg+0xc1/0x250 [ 55.669092][ T0] sock_recvmsg+0x8e/0xb0 [ 55.673430][ T0] sock_read_iter+0x185/0x230 [ 55.678212][ T0] new_sync_read+0x416/0x450 [ 55.682804][ T0] __vfs_read+0x9e/0xb0 [ 55.686954][ T0] vfs_read+0x13e/0x2b0 [ 55.691106][ T0] ksys_read+0x16a/0x1a0 [ 55.695346][ T0] __x64_sys_read+0x49/0x60 [ 55.699866][ T0] do_syscall_64+0xc7/0x3b0 [ 55.704367][ T0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.710240][ T0] [ 55.712570][ T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 0: [ 55.719868][ T0] tick_nohz_next_event+0x181/0x340 [ 55.725073][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 55.730701][ T0] do_idle+0x1ad/0x290 [ 55.734767][ T0] cpu_startup_entry+0x14/0x20 [ 55.739524][ T0] rest_init+0xe4/0xeb [ 55.743591][ T0] arch_call_rest_init+0x13/0x2b [ 55.748551][ T0] start_kernel+0x7fe/0x823 [ 55.753055][ T0] secondary_startup_64+0xa4/0xb0 [ 55.758154][ T0] [ 55.760471][ T0] Reported by Kernel Concurrency Sanitizer on: [ 55.766620][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 55.774499][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.784548][ T0] ================================================================== [ 55.792608][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 55.799258][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 55.807245][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.818421][ T0] Call Trace: [ 55.821778][ T0] dump_stack+0x11d/0x187 [ 55.826108][ T0] panic+0x210/0x640 [ 55.829999][ T0] ? vprintk_func+0x89/0x13a [ 55.834589][ T0] kcsan_report.cold+0xc/0x1a [ 55.839258][ T0] kcsan_setup_watchpoint+0x3fb/0x440 [ 55.844611][ T0] tick_nohz_next_event+0x181/0x340 [ 55.850771][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 55.856309][ T0] ? ktime_get+0x1c9/0x210 [ 55.860829][ T0] ? debug_smp_processor_id+0x3f/0x129 [ 55.866335][ T0] do_idle+0x1ad/0x290 [ 55.870403][ T0] ? do_idle+0x6/0x290 [ 55.874469][ T0] cpu_startup_entry+0x14/0x20 [ 55.879215][ T0] rest_init+0xe4/0xeb [ 55.883270][ T0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 55.889498][ T0] arch_call_rest_init+0x13/0x2b [ 55.894444][ T0] start_kernel+0x7fe/0x823 [ 55.899056][ T0] secondary_startup_64+0xa4/0xb0 [ 55.905418][ T0] Kernel Offset: disabled [ 55.909739][ T0] Rebooting in 86400 seconds..