[ 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 '10.128.0.127' (ECDSA) to the list of known hosts. 2020/06/04 17:32:54 fuzzer started 2020/06/04 17:32:54 dialing manager at 10.128.0.105:43989 2020/06/04 17:32:54 syscalls: 3055 2020/06/04 17:32:54 code coverage: enabled 2020/06/04 17:32:54 comparison tracing: enabled 2020/06/04 17:32:54 extra coverage: enabled 2020/06/04 17:32:54 setuid sandbox: enabled 2020/06/04 17:32:54 namespace sandbox: enabled 2020/06/04 17:32:54 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/04 17:32:54 fault injection: enabled 2020/06/04 17:32:54 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/04 17:32:54 net packet injection: enabled 2020/06/04 17:32:54 net device setup: enabled 2020/06/04 17:32:54 concurrency sanitizer: enabled 2020/06/04 17:32:54 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/04 17:32:54 USB emulation: enabled 2020/06/04 17:32:58 adding functions to KCSAN blacklist: 'copyout' 'blk_mq_dispatch_rq_list' 'pcpu_alloc' 'ext4_mb_find_by_goal' 'ext4_free_inodes_count' 'audit_log_start' 'mod_timer' 'echo_char' 'wg_packet_send_staged_packets' 'file_update_time' 'blk_mq_get_request' 'shmem_file_read_iter' '__delete_from_page_cache' 'fsnotify_parent' 'page_counter_charge' 'find_get_pages_range_tag' 'generic_fillattr' 'run_timer_softirq' 'dd_has_work' 'futex_wait_queue_me' '__send_signal' 'ep_poll' 'snd_rawmidi_kernel_write1' 'kauditd_thread' '__add_to_page_cache_locked' 'copy_process' 'generic_write_end' 'xas_clear_mark' 'ktime_get_real_seconds' '__ext4_new_inode' 'tick_nohz_next_event' 'tick_nohz_idle_stop_tick' 'do_nanosleep' 'complete_signal' 'add_timer' '_find_next_bit' syzkaller login: [ 53.106924][ T8919] KCSAN: could not find function: '_find_next_bit' [ 66.858077][ C1] ================================================================== [ 66.867015][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 66.875786][ C1] [ 66.878121][ C1] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 66.887685][ C1] tick_sched_do_timer+0xb4/0xd0 [ 66.892633][ C1] tick_sched_timer+0x3f/0xd0 [ 66.897315][ C1] __hrtimer_run_queues+0x271/0x600 [ 66.902518][ C1] hrtimer_interrupt+0x226/0x490 [ 66.907551][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 66.912999][ C1] apic_timer_interrupt+0xf/0x20 [ 66.917914][ C1] [ 66.920295][ C1] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 66.928443][ C1] tick_sched_do_timer+0x2e/0xd0 [ 66.933376][ C1] tick_sched_timer+0x3f/0xd0 [ 66.938250][ C1] __hrtimer_run_queues+0x271/0x600 [ 66.943434][ C1] hrtimer_interrupt+0x226/0x490 [ 66.948362][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 66.953808][ C1] apic_timer_interrupt+0xf/0x20 [ 66.958853][ C1] [ 66.961166][ C1] Reported by Kernel Concurrency Sanitizer on: [ 66.967312][ C1] CPU: 1 PID: 8920 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 66.975720][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.985769][ C1] ================================================================== [ 66.994852][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 67.001432][ C1] CPU: 1 PID: 8920 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 67.009731][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.019772][ C1] Call Trace: [ 67.023034][ C1] [ 67.025877][ C1] dump_stack+0x11d/0x187 [ 67.030200][ C1] panic+0x210/0x640 [ 67.034084][ C1] ? vprintk_func+0x89/0x13a [ 67.038659][ C1] kcsan_report.cold+0xc/0x1a [ 67.043337][ C1] kcsan_setup_watchpoint+0x3fb/0x440 [ 67.048713][ C1] tick_sched_do_timer+0x2e/0xd0 [ 67.053642][ C1] tick_sched_timer+0x3f/0xd0 [ 67.058393][ C1] __hrtimer_run_queues+0x271/0x600 [ 67.063577][ C1] ? tick_sched_do_timer+0xd0/0xd0 [ 67.068675][ C1] hrtimer_interrupt+0x226/0x490 [ 67.073600][ C1] ? kvm_clock_read+0x14/0x30 [ 67.078280][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 67.083735][ C1] apic_timer_interrupt+0xf/0x20 [ 67.088661][ C1] [ 67.091586][ C1] RIP: 0033:0x4107fb [ 67.095472][ C1] Code: 85 44 01 00 00 80 78 09 00 0f 85 8c 00 00 00 48 8b 40 10 eb 5d 48 ff c2 48 83 c1 04 48 83 fa 08 73 3a 8b 5c 24 38 39 19 75 eb <0f> b6 1c 02 80 fb 01 76 e2 48 8b 4c 24 28 0f b6 49 51 48 0f af ca [ 67.117145][ C1] RSP: 002b:000000c0006417f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 67.126159][ C1] RAX: 000000c00209a8c0 RBX: 000000003fd142a1 RCX: 000000c00209a8c8 [ 67.134115][ C1] RDX: 0000000000000000 RSI: 00000000008e2b80 RDI: 0000000000000038 [ 67.142249][ C1] RBP: 000000c000641808 R08: 0000000000000000 R09: 000000c003cea2e0 [ 67.150203][ C1] R10: 0000000000000002 R11: ffffffffffffffff R12: 0000000000000000 [ 67.158420][ C1] R13: 0000000000000020 R14: 0000000000000132 R15: ffffffffffffffff [ 67.167831][ C1] Kernel Offset: disabled [ 67.172295][ C1] Rebooting in 86400 seconds..