[  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 '10.128.0.197' (ECDSA) to the list of known hosts.
2020/11/25 05:27:22 fuzzer started
2020/11/25 05:27:22 dialing manager at 10.128.0.105:45221
2020/11/25 05:27:23 syscalls: 3447
2020/11/25 05:27:23 code coverage: enabled
2020/11/25 05:27:23 comparison tracing: enabled
2020/11/25 05:27:23 extra coverage: enabled
2020/11/25 05:27:23 setuid sandbox: enabled
2020/11/25 05:27:23 namespace sandbox: enabled
2020/11/25 05:27:23 Android sandbox: /sys/fs/selinux/policy does not exist
2020/11/25 05:27:23 fault injection: enabled
2020/11/25 05:27:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/11/25 05:27:23 net packet injection: enabled
2020/11/25 05:27:23 net device setup: enabled
2020/11/25 05:27:23 concurrency sanitizer: enabled
2020/11/25 05:27:23 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/11/25 05:27:23 USB emulation: enabled
2020/11/25 05:27:23 hci packet injection: enabled
2020/11/25 05:27:23 wifi device emulation: enabled
2020/11/25 05:27:25 suppressing KCSAN reports in functions: 'blk_mq_rq_ctx_init' 'blk_mq_sched_dispatch_requests' '__io_cqring_fill_event' 'alloc_pid' 'futex_wait_queue_me' 'wbt_done' '__xa_clear_mark' 'generic_write_end' '__delete_from_page_cache' 'ext4_ext_handle_unwritten_extents' 'blk_mq_dispatch_rq_list' 'fsnotify' '__add_to_page_cache_locked' '__ext4_new_inode' 'ext4_free_inodes_count' 'ext4_writepages' 'ext4_free_inode' 
syzkaller login: [   39.812244][    T0] ==================================================================
[   39.820552][    T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_timer
[   39.828452][    T0] 
[   39.830807][    T0] write to 0xffffffff86fc18d0 of 4 bytes by interrupt on cpu 0:
[   39.838434][    T0]  tick_sched_timer+0x1f5/0x210
[   39.843286][    T0]  __run_hrtimer+0x133/0x420
[   39.847872][    T0]  hrtimer_interrupt+0x36e/0xa10
[   39.852805][    T0]  __sysvec_apic_timer_interrupt+0x6f/0x200
[   39.858694][    T0]  sysvec_apic_timer_interrupt+0x6f/0x90
[   39.864317][    T0]  asm_sysvec_apic_timer_interrupt+0x12/0x20
[   39.870279][    T0] 
[   39.872609][    T0] read to 0xffffffff86fc18d0 of 4 bytes by task 0 on cpu 1:
[   39.879881][    T0]  tick_nohz_next_event+0x217/0x300
[   39.885068][    T0]  tick_nohz_get_sleep_length+0x121/0x270
[   39.890777][    T0]  menu_select+0x2fa/0xf40
[   39.895616][    T0]  cpuidle_select+0x3d/0x50
[   39.900092][    T0]  do_idle+0x15f/0x230
[   39.904151][    T0]  cpu_startup_entry+0x15/0x20
[   39.908901][    T0]  secondary_startup_64_no_verify+0xb0/0xbb
[   39.915192][    T0] 
[   39.917490][    T0] Reported by Kernel Concurrency Sanitizer on:
[   39.923615][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.10.0-rc5-syzkaller #0
[   39.931558][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.941590][    T0] ==================================================================
[   39.949921][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   39.956485][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.10.0-rc5-syzkaller #0
[   39.964435][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.974659][    T0] Call Trace:
[   39.977929][    T0]  dump_stack+0x116/0x15d
[   39.982668][    T0]  panic+0x1e7/0x5fa
[   39.986542][    T0]  ? vprintk_emit+0x2f2/0x370
[   39.991197][    T0]  kcsan_report+0x67b/0x680
[   39.995702][    T0]  ? kcsan_setup_watchpoint+0x46a/0x4d0
[   40.001221][    T0]  ? tick_nohz_next_event+0x217/0x300
[   40.006564][    T0]  ? tick_nohz_get_sleep_length+0x121/0x270
[   40.012431][    T0]  ? menu_select+0x2fa/0xf40
[   40.016993][    T0]  ? cpuidle_select+0x3d/0x50
[   40.021661][    T0]  ? do_idle+0x15f/0x230
[   40.025878][    T0]  ? cpu_startup_entry+0x15/0x20
[   40.030795][    T0]  ? secondary_startup_64_no_verify+0xb0/0xbb
[   40.036872][    T0]  ? ktime_get+0x1b0/0x1e0
[   40.041276][    T0]  kcsan_setup_watchpoint+0x46a/0x4d0
[   40.046630][    T0]  tick_nohz_next_event+0x217/0x300
[   40.051814][    T0]  tick_nohz_get_sleep_length+0x121/0x270
[   40.057524][    T0]  menu_select+0x2fa/0xf40
[   40.061914][    T0]  ? kvm_sched_clock_read+0x15/0x40
[   40.067085][    T0]  ? _raw_spin_unlock_irq+0x22/0x40
[   40.072257][    T0]  ? finish_task_switch+0x81/0x280
[   40.077343][    T0]  cpuidle_select+0x3d/0x50
[   40.081851][    T0]  do_idle+0x15f/0x230
[   40.085895][    T0]  cpu_startup_entry+0x15/0x20
[   40.090719][    T0]  secondary_startup_64_no_verify+0xb0/0xbb
[   40.097439][    T0] Kernel Offset: disabled
[   40.101913][    T0] Rebooting in 86400 seconds..