[ 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 '10.128.1.34' (ECDSA) to the list of known hosts. 2020/04/21 01:04:59 fuzzer started syzkaller login: [ 48.141432][ T6738] as (6738) used greatest stack depth: 10848 bytes left 2020/04/21 01:05:01 dialing manager at 10.128.0.105:39923 2020/04/21 01:05:14 syscalls: 2960 2020/04/21 01:05:14 code coverage: enabled 2020/04/21 01:05:14 comparison tracing: enabled 2020/04/21 01:05:14 extra coverage: enabled 2020/04/21 01:05:14 setuid sandbox: enabled 2020/04/21 01:05:14 namespace sandbox: enabled 2020/04/21 01:05:14 Android sandbox: /sys/fs/selinux/policy does not exist 2020/04/21 01:05:14 fault injection: enabled 2020/04/21 01:05:14 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/04/21 01:05:14 net packet injection: enabled 2020/04/21 01:05:14 net device setup: enabled 2020/04/21 01:05:14 concurrency sanitizer: enabled 2020/04/21 01:05:14 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/04/21 01:05:14 USB emulation: /dev/raw-gadget does not exist [ 62.128747][ T6746] KCSAN: could not find function: 'poll_schedule_timeout' 2020/04/21 01:05:17 adding functions to KCSAN blacklist: 'mod_timer' 'blk_mq_get_request' 'add_timer' 'ext4_free_inodes_count' 'ktime_get_real_seconds' 'xas_clear_mark' 'poll_schedule_timeout' 'blk_mq_dispatch_rq_list' 'find_get_pages_range_tag' 'run_timer_softirq' 'ep_poll' 'page_counter_charge' 'copy_process' 'blk_mq_sched_dispatch_requests' 'do_signal_stop' 'generic_fillattr' 'do_nanosleep' '__ext4_new_inode' '__snd_rawmidi_transmit_ack' 'ktime_get_ts64' 'generic_write_end' '_find_next_bit' [ 64.168662][ T6746] KCSAN: could not find function: '_find_next_bit' [ 73.387672][ T0] ================================================================== [ 73.395907][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 73.404054][ T0] [ 73.406481][ T0] write to 0xffffffff85f0ef50 of 4 bytes by interrupt on cpu 0: [ 73.414121][ T0] tick_sched_do_timer+0xb4/0xd0 [ 73.419088][ T0] tick_sched_timer+0x3f/0xd0 [ 73.423795][ T0] __hrtimer_run_queues+0x271/0x600 [ 73.428992][ T0] hrtimer_interrupt+0x226/0x490 [ 73.433931][ T0] smp_apic_timer_interrupt+0xd8/0x270 [ 73.439374][ T0] apic_timer_interrupt+0xf/0x20 [ 73.444283][ T0] [ 73.446636][ T0] read to 0xffffffff85f0ef50 of 4 bytes by task 0 on cpu 1: [ 73.453918][ T0] tick_nohz_next_event+0x181/0x340 [ 73.459136][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 73.464659][ T0] do_idle+0x1ad/0x290 [ 73.468743][ T0] cpu_startup_entry+0x14/0x20 [ 73.473517][ T0] start_secondary+0x169/0x1b0 [ 73.478257][ T0] secondary_startup_64+0xa4/0xb0 [ 73.483260][ T0] [ 73.485564][ T0] Reported by Kernel Concurrency Sanitizer on: [ 73.491715][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 73.499593][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.509646][ T0] ================================================================== [ 73.517731][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 73.524843][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 73.532712][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.542859][ T0] Call Trace: [ 73.546140][ T0] dump_stack+0x11d/0x187 [ 73.550492][ T0] panic+0x210/0x640 [ 73.554373][ T0] ? vprintk_func+0x89/0x13a [ 73.558951][ T0] kcsan_report.cold+0xc/0x1a [ 73.563614][ T0] kcsan_setup_watchpoint+0x3fb/0x440 [ 73.568972][ T0] tick_nohz_next_event+0x181/0x340 [ 73.574155][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 73.579679][ T0] ? ktime_get+0x1c9/0x210 [ 73.584077][ T0] ? debug_smp_processor_id+0x3f/0x129 [ 73.589517][ T0] do_idle+0x1ad/0x290 [ 73.593578][ T0] cpu_startup_entry+0x14/0x20 [ 73.598322][ T0] start_secondary+0x169/0x1b0 [ 73.603066][ T0] secondary_startup_64+0xa4/0xb0 [ 73.609250][ T0] Kernel Offset: disabled [ 73.613572][ T0] Rebooting in 86400 seconds..